Committing in .

[wxWidgets.git] / src / png / pngvcrd.c

diff --git a/src/png/pngvcrd.c b/src/png/pngvcrd.c
index 72c44121316b1cefbbd2f7f3d6e051824d42c69b..5e0bf698edd391e260e1e0ef5fccb4903b02daee 100644 (file)
--- a/src/png/pngvcrd.c
+++ b/src/png/pngvcrd.c
@@ -2,9 +2,9 @@
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *
  *
  * For Intel x86 CPU and Microsoft Visual C++ compiler
  *

- * libpng version 1.2.4 - July 8, 2002
+ * libpng version 1.2.6 - August 15, 2004

  * For conditions of distribution and use, see copyright notice in png.h
  * For conditions of distribution and use, see copyright notice in png.h

- * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2004 Glenn Randers-Pehrson

  * Copyright (c) 1998, Intel Corporation
  *
  * Contributed by Nirav Chhatrapati, Intel Corporation, 1998
  * Copyright (c) 1998, Intel Corporation
  *
  * Contributed by Nirav Chhatrapati, Intel Corporation, 1998


@@ -36,56 +36,56 @@ png_mmx_support(void)
 {
   int mmx_supported_local = 0;
   _asm {
 {
   int mmx_supported_local = 0;
   _asm {

-    push ebx          //CPUID will trash these
+    push ebx          /*CPUID will trash these */

     push ecx
     push edx
 
     push ecx
     push edx
 

-    pushfd            //Save Eflag to stack
-    pop eax           //Get Eflag from stack into eax
-    mov ecx, eax      //Make another copy of Eflag in ecx
-    xor eax, 0x200000 //Toggle ID bit in Eflag [i.e. bit(21)]
-    push eax          //Save modified Eflag back to stack
-
-    popfd             //Restored modified value back to Eflag reg
-    pushfd            //Save Eflag to stack
-    pop eax           //Get Eflag from stack
-    push ecx          // save original Eflag to stack
-    popfd             // restore original Eflag
-    xor eax, ecx      //Compare the new Eflag with the original Eflag
-    jz NOT_SUPPORTED  //If the same, CPUID instruction is not supported,
-                      //skip following instructions and jump to
-                      //NOT_SUPPORTED label
-
-    xor eax, eax      //Set eax to zero
-
-    _asm _emit 0x0f   //CPUID instruction  (two bytes opcode)
+    pushfd            /*Save Eflag to stack */
+    pop eax           /*Get Eflag from stack into eax */
+    mov ecx, eax      /*Make another copy of Eflag in ecx */
+    xor eax, 0x200000 /*Toggle ID bit in Eflag [i.e. bit(21)] */
+    push eax          /*Save modified Eflag back to stack */
+
+    popfd             /*Restored modified value back to Eflag reg */
+    pushfd            /*Save Eflag to stack */
+    pop eax           /*Get Eflag from stack */
+    push ecx          /* save original Eflag to stack */
+    popfd             /* restore original Eflag */
+    xor eax, ecx      /*Compare the new Eflag with the original Eflag */
+    jz NOT_SUPPORTED  /*If the same, CPUID instruction is not supported, */
+                      /*skip following instructions and jump to */
+                      /*NOT_SUPPORTED label */
+
+    xor eax, eax      /*Set eax to zero */
+
+    _asm _emit 0x0f   /*CPUID instruction  (two bytes opcode) */

     _asm _emit 0xa2
 
     _asm _emit 0xa2
 

-    cmp eax, 1        //make sure eax return non-zero value
-    jl NOT_SUPPORTED  //If eax is zero, mmx not supported
+    cmp eax, 1        /*make sure eax return non-zero value */
+    jl NOT_SUPPORTED  /*If eax is zero, mmx not supported */

 
 

-    xor eax, eax      //set eax to zero
-    inc eax           //Now increment eax to 1.  This instruction is
-                      //faster than the instruction "mov eax, 1"
+    xor eax, eax      /*set eax to zero */
+    inc eax           /*Now increment eax to 1.  This instruction is */
+                      /*faster than the instruction "mov eax, 1" */

 
 

-    _asm _emit 0x0f   //CPUID instruction
+    _asm _emit 0x0f   /*CPUID instruction */

     _asm _emit 0xa2
 
     _asm _emit 0xa2
 

-    and edx, 0x00800000  //mask out all bits but mmx bit(24)
-    cmp edx, 0        // 0 = mmx not supported
-    jz  NOT_SUPPORTED // non-zero = Yes, mmx IS supported
+    and edx, 0x00800000  /*mask out all bits but mmx bit(24) */
+    cmp edx, 0        /* 0 = mmx not supported */
+    jz  NOT_SUPPORTED /* non-zero = Yes, mmx IS supported */

 
 

-    mov  mmx_supported_local, 1  //set return value to 1
+    mov  mmx_supported_local, 1  /*set return value to 1 */

 
 NOT_SUPPORTED:
 
 NOT_SUPPORTED:

-    mov  eax, mmx_supported_local  //move return value to eax
-    pop edx          //CPUID trashed these
+    mov  eax, mmx_supported_local  /*move return value to eax */
+    pop edx          /*CPUID trashed these */

     pop ecx
     pop ebx
   }
 
     pop ecx
     pop ebx
   }
 

-  //mmx_supported_local=0; // test code for force don't support MMX
-  //printf("MMX : %u (1=MMX supported)\n",mmx_supported_local);
+  /*mmx_supported_local=0; // test code for force don't support MMX */
+  /*printf("MMX : %u (1=MMX supported)\n",mmx_supported_local); */

 
   mmx_supported = mmx_supported_local;
   return mmx_supported_local;
 
   mmx_supported = mmx_supported_local;
   return mmx_supported_local;


@@ -115,15 +115,18 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
    png_debug(1,"in png_combine_row_asm\n");
 
    if (mmx_supported == 2) {
    png_debug(1,"in png_combine_row_asm\n");
 
    if (mmx_supported == 2) {

+#if !defined(PNG_1_0_X)

        /* this should have happened in png_init_mmx_flags() already */
        png_warning(png_ptr, "asm_flags may not have been initialized");
        /* this should have happened in png_init_mmx_flags() already */
        png_warning(png_ptr, "asm_flags may not have been initialized");

+#endif

        png_mmx_support();
    }
 
    if (mask == 0xff)
    {
       png_memcpy(row, png_ptr->row_buf + 1,
        png_mmx_support();
    }
 
    if (mask == 0xff)
    {
       png_memcpy(row, png_ptr->row_buf + 1,

-       (png_size_t)((png_ptr->width * png_ptr->row_info.pixel_depth + 7) >> 3));
+       (png_size_t)PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+       png_ptr->width));

    }
    /* GRR:  add "else if (mask == 0)" case?
     *       or does png_combine_row() not even get called in that case? */
    }
    /* GRR:  add "else if (mask == 0)" case?
     *       or does png_combine_row() not even get called in that case? */


@@ -307,33 +310,37 @@ png_combine_row(png_structp png_ptr, png_bytep row, int mask)
 
             __int64 mask0=0x0102040810204080;
 
 
             __int64 mask0=0x0102040810204080;
 

+#if !defined(PNG_1_0_X)

             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )
             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )

+#else
+            if (mmx_supported)
+#endif

             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
                m = 0x80;
                unmask = ~mask;
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
                m = 0x80;
                unmask = ~mask;

-               len  = png_ptr->width &~7;  //reduce to multiple of 8
-               diff = png_ptr->width & 7;  //amount lost
+               len  = png_ptr->width &~7;  /*reduce to multiple of 8 */
+               diff = png_ptr->width & 7;  /*amount lost */

 
                _asm
                {
 
                _asm
                {

-                  movd       mm7, unmask   //load bit pattern
-                  psubb      mm6,mm6       //zero mm6
+                  movd       mm7, unmask   /*load bit pattern */
+                  psubb      mm6,mm6       /*zero mm6 */

                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7
                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7

-                  punpckldq  mm7,mm7       //fill register with 8 masks
+                  punpckldq  mm7,mm7       /*fill register with 8 masks */

 
                   movq       mm0,mask0
 
 
                   movq       mm0,mask0
 

-                  pand       mm0,mm7       //nonzero if keep byte
-                  pcmpeqb    mm0,mm6       //zeros->1s, v versa
+                  pand       mm0,mm7       /*nonzero if keep byte */
+                  pcmpeqb    mm0,mm6       /*zeros->1s, v versa */

 
 

-                  mov        ecx,len       //load length of line (pixels)
-                  mov        esi,srcptr    //load source
-                  mov        ebx,dstptr    //load dest
-                  cmp        ecx,0         //lcr
+                  mov        ecx,len       /*load length of line (pixels) */
+                  mov        esi,srcptr    /*load source */
+                  mov        ebx,dstptr    /*load dest */
+                  cmp        ecx,0         /*lcr */

                   je         mainloop8end
 
 mainloop8:
                   je         mainloop8end
 
 mainloop8:


@@ -344,9 +351,9 @@ mainloop8:
                   por        mm4,mm6
                   movq       [ebx],mm4
 
                   por        mm4,mm6
                   movq       [ebx],mm4
 

-                  add        esi,8         //inc by 8 bytes processed
+                  add        esi,8         /*inc by 8 bytes processed */

                   add        ebx,8
                   add        ebx,8

-                  sub        ecx,8         //dec by 8 pixels processed
+                  sub        ecx,8         /*dec by 8 pixels processed */

 
                   ja         mainloop8
 mainloop8end:
 
                   ja         mainloop8
 mainloop8end:


@@ -356,11 +363,11 @@ mainloop8end:
                   jz         end8
 
                   mov        edx,mask
                   jz         end8
 
                   mov        edx,mask

-                  sal        edx,24        //make low byte the high byte
+                  sal        edx,24        /*make low byte the high byte */

 
 secondloop8:
 
 secondloop8:

-                  sal        edx,1         //move high bit to CF
-                  jnc        skip8         //if CF = 0
+                  sal        edx,1         /*move high bit to CF */
+                  jnc        skip8         /*if CF = 0 */

                   mov        al,[esi]
                   mov        [ebx],al
 skip8:
                   mov        al,[esi]
                   mov        [ebx],al
 skip8:


@@ -397,7 +404,7 @@ end8:
             } /* end of else */
 
             break;
             } /* end of else */
 
             break;

-         }       // end 8 bpp
+         }       /* end 8 bpp */

 
          case 16:
          {
 
          case 16:
          {


@@ -408,8 +415,12 @@ end8:
             __int64 mask1=0x0101020204040808,
                     mask0=0x1010202040408080;
 
             __int64 mask1=0x0101020204040808,
                     mask0=0x1010202040408080;
 

+#if !defined(PNG_1_0_X)

             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )
             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )

+#else
+            if (mmx_supported)
+#endif

             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;


@@ -419,11 +430,11 @@ end8:
                diff = (png_ptr->width)&7;
                _asm
                {
                diff = (png_ptr->width)&7;
                _asm
                {

-                  movd       mm7, unmask       //load bit pattern
-                  psubb      mm6,mm6           //zero mm6
+                  movd       mm7, unmask       /*load bit pattern */
+                  psubb      mm6,mm6           /*zero mm6 */

                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7
                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7

-                  punpckldq  mm7,mm7           //fill register with 8 masks
+                  punpckldq  mm7,mm7           /*fill register with 8 masks */

 
                   movq       mm0,mask0
                   movq       mm1,mask1
 
                   movq       mm0,mask0
                   movq       mm1,mask1


@@ -434,10 +445,10 @@ end8:
                   pcmpeqb    mm0,mm6
                   pcmpeqb    mm1,mm6
 
                   pcmpeqb    mm0,mm6
                   pcmpeqb    mm1,mm6
 

-                  mov        ecx,len           //load length of line
-                  mov        esi,srcptr        //load source
-                  mov        ebx,dstptr        //load dest
-                  cmp        ecx,0             //lcr
+                  mov        ecx,len           /*load length of line */
+                  mov        esi,srcptr        /*load source */
+                  mov        ebx,dstptr        /*load dest */
+                  cmp        ecx,0             /*lcr */

                   jz         mainloop16end
 
 mainloop16:
                   jz         mainloop16end
 
 mainloop16:


@@ -457,9 +468,9 @@ mainloop16:
                   por        mm5,mm7
                   movq       [ebx+8],mm5
 
                   por        mm5,mm7
                   movq       [ebx+8],mm5
 

-                  add        esi,16            //inc by 16 bytes processed
+                  add        esi,16            /*inc by 16 bytes processed */

                   add        ebx,16
                   add        ebx,16

-                  sub        ecx,8             //dec by 8 pixels processed
+                  sub        ecx,8             /*dec by 8 pixels processed */

 
                   ja         mainloop16
 
 
                   ja         mainloop16
 


@@ -469,10 +480,10 @@ mainloop16end:
                   jz         end16
 
                   mov        edx,mask
                   jz         end16
 
                   mov        edx,mask

-                  sal        edx,24            //make low byte the high byte
+                  sal        edx,24            /*make low byte the high byte */

 secondloop16:
 secondloop16:

-                  sal        edx,1             //move high bit to CF
-                  jnc        skip16            //if CF = 0
+                  sal        edx,1             /*move high bit to CF */
+                  jnc        skip16            /*if CF = 0 */

                   mov        ax,[esi]
                   mov        [ebx],ax
 skip16:
                   mov        ax,[esi]
                   mov        [ebx],ax
 skip16:


@@ -509,7 +520,7 @@ end16:
             } /* end of else */
 
             break;
             } /* end of else */
 
             break;

-         }       // end 16 bpp
+         }       /* end 16 bpp */

 
          case 24:
          {
 
          case 24:
          {


@@ -518,7 +529,7 @@ end16:
             png_uint_32 len;
             int unmask, diff;
 
             png_uint_32 len;
             int unmask, diff;
 

-            __int64 mask2=0x0101010202020404,  //24bpp
+            __int64 mask2=0x0101010202020404,  /*24bpp */

                     mask1=0x0408080810101020,
                     mask0=0x2020404040808080;
 
                     mask1=0x0408080810101020,
                     mask0=0x2020404040808080;
 


@@ -529,16 +540,20 @@ end16:
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 

+#if !defined(PNG_1_0_X)

             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )
             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )

+#else
+            if (mmx_supported)
+#endif

             {
                _asm
                {
             {
                _asm
                {

-                  movd       mm7, unmask       //load bit pattern
-                  psubb      mm6,mm6           //zero mm6
+                  movd       mm7, unmask       /*load bit pattern */
+                  psubb      mm6,mm6           /*zero mm6 */

                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7
                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7

-                  punpckldq  mm7,mm7           //fill register with 8 masks
+                  punpckldq  mm7,mm7           /*fill register with 8 masks */

 
                   movq       mm0,mask0
                   movq       mm1,mask1
 
                   movq       mm0,mask0
                   movq       mm1,mask1


@@ -552,9 +567,9 @@ end16:
                   pcmpeqb    mm1,mm6
                   pcmpeqb    mm2,mm6
 
                   pcmpeqb    mm1,mm6
                   pcmpeqb    mm2,mm6
 

-                  mov        ecx,len           //load length of line
-                  mov        esi,srcptr        //load source
-                  mov        ebx,dstptr        //load dest
+                  mov        ecx,len           /*load length of line */
+                  mov        esi,srcptr        /*load source */
+                  mov        ebx,dstptr        /*load dest */

                   cmp        ecx,0
                   jz         mainloop24end
 
                   cmp        ecx,0
                   jz         mainloop24end
 


@@ -584,9 +599,9 @@ mainloop24:
                   por        mm6,mm4
                   movq       [ebx+16],mm6
 
                   por        mm6,mm4
                   movq       [ebx+16],mm6
 

-                  add        esi,24            //inc by 24 bytes processed
+                  add        esi,24            /*inc by 24 bytes processed */

                   add        ebx,24
                   add        ebx,24

-                  sub        ecx,8             //dec by 8 pixels processed
+                  sub        ecx,8             /*dec by 8 pixels processed */

 
                   ja         mainloop24
 
 
                   ja         mainloop24
 


@@ -596,10 +611,10 @@ mainloop24end:
                   jz         end24
 
                   mov        edx,mask
                   jz         end24
 
                   mov        edx,mask

-                  sal        edx,24            //make low byte the high byte
+                  sal        edx,24            /*make low byte the high byte */

 secondloop24:
 secondloop24:

-                  sal        edx,1             //move high bit to CF
-                  jnc        skip24            //if CF = 0
+                  sal        edx,1             /*move high bit to CF */
+                  jnc        skip24            /*if CF = 0 */

                   mov        ax,[esi]
                   mov        [ebx],ax
                   xor        eax,eax
                   mov        ax,[esi]
                   mov        [ebx],ax
                   xor        eax,eax


@@ -640,7 +655,7 @@ end24:
             } /* end of else */
 
             break;
             } /* end of else */
 
             break;

-         }       // end 24 bpp
+         }       /* end 24 bpp */

 
          case 32:
          {
 
          case 32:
          {


@@ -649,7 +664,7 @@ end24:
             png_uint_32 len;
             int unmask, diff;
 
             png_uint_32 len;
             int unmask, diff;
 

-            __int64 mask3=0x0101010102020202,  //32bpp
+            __int64 mask3=0x0101010102020202,  /*32bpp */

                     mask2=0x0404040408080808,
                     mask1=0x1010101020202020,
                     mask0=0x4040404080808080;
                     mask2=0x0404040408080808,
                     mask1=0x1010101020202020,
                     mask0=0x4040404080808080;


@@ -661,16 +676,20 @@ end24:
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 
             len     = (png_ptr->width)&~7;
             diff = (png_ptr->width)&7;
 

+#if !defined(PNG_1_0_X)

             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )
             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )

+#else
+            if (mmx_supported)
+#endif

             {
                _asm
                {
             {
                _asm
                {

-                  movd       mm7, unmask       //load bit pattern
-                  psubb      mm6,mm6           //zero mm6
+                  movd       mm7, unmask       /*load bit pattern */
+                  psubb      mm6,mm6           /*zero mm6 */

                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7
                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7

-                  punpckldq  mm7,mm7           //fill register with 8 masks
+                  punpckldq  mm7,mm7           /*fill register with 8 masks */

 
                   movq       mm0,mask0
                   movq       mm1,mask1
 
                   movq       mm0,mask0
                   movq       mm1,mask1


@@ -687,11 +706,11 @@ end24:
                   pcmpeqb    mm2,mm6
                   pcmpeqb    mm3,mm6
 
                   pcmpeqb    mm2,mm6
                   pcmpeqb    mm3,mm6
 

-                  mov        ecx,len           //load length of line
-                  mov        esi,srcptr        //load source
-                  mov        ebx,dstptr        //load dest
+                  mov        ecx,len           /*load length of line */
+                  mov        esi,srcptr        /*load source */
+                  mov        ebx,dstptr        /*load dest */

 
 

-                  cmp        ecx,0             //lcr
+                  cmp        ecx,0             /*lcr */

                   jz         mainloop32end
 
 mainloop32:
                   jz         mainloop32end
 
 mainloop32:


@@ -727,9 +746,9 @@ mainloop32:
                   por        mm7,mm5
                   movq       [ebx+24],mm7
 
                   por        mm7,mm5
                   movq       [ebx+24],mm7
 

-                  add        esi,32            //inc by 32 bytes processed
+                  add        esi,32            /*inc by 32 bytes processed */

                   add        ebx,32
                   add        ebx,32

-                  sub        ecx,8             //dec by 8 pixels processed
+                  sub        ecx,8             /*dec by 8 pixels processed */

 
                   ja         mainloop32
 
 
                   ja         mainloop32
 


@@ -739,10 +758,10 @@ mainloop32end:
                   jz         end32
 
                   mov        edx,mask
                   jz         end32
 
                   mov        edx,mask

-                  sal        edx,24            //make low byte the high byte
+                  sal        edx,24            /*make low byte the high byte */

 secondloop32:
 secondloop32:

-                  sal        edx,1             //move high bit to CF
-                  jnc        skip32            //if CF = 0
+                  sal        edx,1             /*move high bit to CF */
+                  jnc        skip32            /*if CF = 0 */

                   mov        eax,[esi]
                   mov        [ebx],eax
 skip32:
                   mov        eax,[esi]
                   mov        [ebx],eax
 skip32:


@@ -780,7 +799,7 @@ end32:
             } /* end of else */
 
             break;
             } /* end of else */
 
             break;

-         }       // end 32 bpp
+         }       /* end 32 bpp */

 
          case 48:
          {
 
          case 48:
          {


@@ -796,8 +815,12 @@ end32:
                     mask1=0x2020202040404040,
                     mask0=0x4040808080808080;
 
                     mask1=0x2020202040404040,
                     mask0=0x4040808080808080;
 

+#if !defined(PNG_1_0_X)

             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )
             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_COMBINE_ROW)
                 /* && mmx_supported */ )

+#else
+            if (mmx_supported)
+#endif

             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;
             {
                srcptr = png_ptr->row_buf + 1;
                dstptr = row;


@@ -807,11 +830,11 @@ end32:
                diff = (png_ptr->width)&7;
                _asm
                {
                diff = (png_ptr->width)&7;
                _asm
                {

-                  movd       mm7, unmask       //load bit pattern
-                  psubb      mm6,mm6           //zero mm6
+                  movd       mm7, unmask       /*load bit pattern */
+                  psubb      mm6,mm6           /*zero mm6 */

                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7
                   punpcklbw  mm7,mm7
                   punpcklwd  mm7,mm7

-                  punpckldq  mm7,mm7           //fill register with 8 masks
+                  punpckldq  mm7,mm7           /*fill register with 8 masks */

 
                   movq       mm0,mask0
                   movq       mm1,mask1
 
                   movq       mm0,mask0
                   movq       mm1,mask1


@@ -834,9 +857,9 @@ end32:
                   pcmpeqb    mm4,mm6
                   pcmpeqb    mm5,mm6
 
                   pcmpeqb    mm4,mm6
                   pcmpeqb    mm5,mm6
 

-                  mov        ecx,len           //load length of line
-                  mov        esi,srcptr        //load source
-                  mov        ebx,dstptr        //load dest
+                  mov        ecx,len           /*load length of line */
+                  mov        esi,srcptr        /*load source */
+                  mov        ebx,dstptr        /*load dest */

 
                   cmp        ecx,0
                   jz         mainloop48end
 
                   cmp        ecx,0
                   jz         mainloop48end


@@ -884,9 +907,9 @@ mainloop48:
                   por        mm7,mm6
                   movq       [ebx+40],mm7
 
                   por        mm7,mm6
                   movq       [ebx+40],mm7
 

-                  add        esi,48            //inc by 32 bytes processed
+                  add        esi,48            /*inc by 32 bytes processed */

                   add        ebx,48
                   add        ebx,48

-                  sub        ecx,8             //dec by 8 pixels processed
+                  sub        ecx,8             /*dec by 8 pixels processed */

 
                   ja         mainloop48
 mainloop48end:
 
                   ja         mainloop48
 mainloop48end:


@@ -896,11 +919,11 @@ mainloop48end:
                   jz         end48
 
                   mov        edx,mask
                   jz         end48
 
                   mov        edx,mask

-                  sal        edx,24            //make low byte the high byte
+                  sal        edx,24            /*make low byte the high byte */

 
 secondloop48:
 
 secondloop48:

-                  sal        edx,1             //move high bit to CF
-                  jnc        skip48            //if CF = 0
+                  sal        edx,1             /*move high bit to CF */
+                  jnc        skip48            /*if CF = 0 */

                   mov        eax,[esi]
                   mov        [ebx],eax
 skip48:
                   mov        eax,[esi]
                   mov        [ebx],eax
 skip48:


@@ -938,7 +961,7 @@ end48:
             } /* end of else */
 
             break;
             } /* end of else */
 
             break;

-         }       // end 48 bpp
+         }       /* end 48 bpp */

 
          default:
          {
 
          default:
          {


@@ -947,7 +970,7 @@ end48:
             png_size_t pixel_bytes;
             int offset_table[7] = {0, 4, 0, 2, 0, 1, 0};
             unsigned int i;
             png_size_t pixel_bytes;
             int offset_table[7] = {0, 4, 0, 2, 0, 1, 0};
             unsigned int i;

-            register int disp = png_pass_inc[png_ptr->pass];  // get the offset
+            register int disp = png_pass_inc[png_ptr->pass];  /* get the offset */

             register unsigned int incr1, initial_val, final_val;
 
             pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
             register unsigned int incr1, initial_val, final_val;
 
             pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);


@@ -987,8 +1010,10 @@ png_do_read_interlace(png_structp png_ptr)
    png_debug(1,"in png_do_read_interlace\n");
 
    if (mmx_supported == 2) {
    png_debug(1,"in png_do_read_interlace\n");
 
    if (mmx_supported == 2) {

+#if !defined(PNG_1_0_X)

        /* this should have happened in png_init_mmx_flags() already */
        png_warning(png_ptr, "asm_flags may not have been initialized");
        /* this should have happened in png_init_mmx_flags() already */
        png_warning(png_ptr, "asm_flags may not have been initialized");

+#endif

        png_mmx_support();
    }
 
        png_mmx_support();
    }
 


@@ -1170,10 +1195,10 @@ png_do_read_interlace(png_structp png_ptr)
             break;
          }
 
             break;
          }
 

-         default:         // This is the place where the routine is modified
+         default:         /* This is the place where the routine is modified */

          {
             __int64 const4 = 0x0000000000FFFFFF;
          {
             __int64 const4 = 0x0000000000FFFFFF;

-            // __int64 const5 = 0x000000FFFFFF0000;  // unused...
+            /* __int64 const5 = 0x000000FFFFFF0000;  // unused... */

             __int64 const6 = 0x00000000000000FF;
             png_bytep sptr, dp;
             png_uint_32 i;
             __int64 const6 = 0x00000000000000FF;
             png_bytep sptr, dp;
             png_uint_32 i;


@@ -1184,13 +1209,17 @@ png_do_read_interlace(png_structp png_ptr)
 
             sptr = row + (width - 1) * pixel_bytes;
             dp = row + (final_width - 1) * pixel_bytes;
 
             sptr = row + (width - 1) * pixel_bytes;
             dp = row + (final_width - 1) * pixel_bytes;

-            // New code by Nirav Chhatrapati - Intel Corporation
-            // sign fix by GRR
-            // NOTE:  there is NO MMX code for 48-bit and 64-bit images
+            /* New code by Nirav Chhatrapati - Intel Corporation */
+            /* sign fix by GRR */
+            /* NOTE:  there is NO MMX code for 48-bit and 64-bit images */

 
             // use MMX routine if machine supports it
 
             // use MMX routine if machine supports it

+#if !defined(PNG_1_0_X)

             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_INTERLACE)
                 /* && mmx_supported */ )
             if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_INTERLACE)
                 /* && mmx_supported */ )

+#else
+            if (mmx_supported)
+#endif

             {
                if (pixel_bytes == 3)
                {
             {
                if (pixel_bytes == 3)
                {


@@ -1201,7 +1230,7 @@ png_do_read_interlace(png_structp png_ptr)
                         mov esi, sptr
                         mov edi, dp
                         mov ecx, width
                         mov esi, sptr
                         mov edi, dp
                         mov ecx, width

-                        sub edi, 21   // (png_pass_inc[pass] - 1)*pixel_bytes
+                        sub edi, 21   /* (png_pass_inc[pass] - 1)*pixel_bytes */

 loop_pass0:
                         movd mm0, [esi]     ; X X X X X v2 v1 v0
                         pand mm0, const4    ; 0 0 0 0 0 v2 v1 v0
 loop_pass0:
                         movd mm0, [esi]     ; X X X X X v2 v1 v0
                         pand mm0, const4    ; 0 0 0 0 0 v2 v1 v0


@@ -1223,7 +1252,7 @@ loop_pass0:
                         sub esi, 3
                         movq [edi], mm0
                         sub edi, 24
                         sub esi, 3
                         movq [edi], mm0
                         sub edi, 24

-                        //sub esi, 3
+                        /*sub esi, 3 */

                         dec ecx
                         jnz loop_pass0
                         EMMS
                         dec ecx
                         jnz loop_pass0
                         EMMS


@@ -1236,7 +1265,7 @@ loop_pass0:
                         mov esi, sptr
                         mov edi, dp
                         mov ecx, width
                         mov esi, sptr
                         mov edi, dp
                         mov ecx, width

-                        sub edi, 9   // (png_pass_inc[pass] - 1)*pixel_bytes
+                        sub edi, 9   /* (png_pass_inc[pass] - 1)*pixel_bytes */

 loop_pass2:
                         movd mm0, [esi]     ; X X X X X v2 v1 v0
                         pand mm0, const4    ; 0 0 0 0 0 v2 v1 v0
 loop_pass2:
                         movd mm0, [esi]     ; X X X X X v2 v1 v0
                         pand mm0, const4    ; 0 0 0 0 0 v2 v1 v0


@@ -1262,7 +1291,7 @@ loop_pass2:
                      int width_mmx = ((width >> 1) << 1) - 8;
                      if (width_mmx < 0)
                          width_mmx = 0;
                      int width_mmx = ((width >> 1) << 1) - 8;
                      if (width_mmx < 0)
                          width_mmx = 0;

-                     width -= width_mmx;        // 8 or 9 pix, 24 or 27 bytes
+                     width -= width_mmx;        /* 8 or 9 pix, 24 or 27 bytes */

                      if (width_mmx)
                      {
                         _asm
                      if (width_mmx)
                      {
                         _asm


@@ -1441,12 +1470,12 @@ loop1_pass4:
                            movq mm0, [esi]     ; v0 v1 v2 v3 v4 v5 v6 v7
                            movq mm1, mm0       ; v0 v1 v2 v3 v4 v5 v6 v7
                            punpcklbw mm0, mm0  ; v4 v4 v5 v5 v6 v6 v7 v7
                            movq mm0, [esi]     ; v0 v1 v2 v3 v4 v5 v6 v7
                            movq mm1, mm0       ; v0 v1 v2 v3 v4 v5 v6 v7
                            punpcklbw mm0, mm0  ; v4 v4 v5 v5 v6 v6 v7 v7

-                           //movq mm1, mm0     ; v0 v0 v1 v1 v2 v2 v3 v3
+                           /*movq mm1, mm0     ; v0 v0 v1 v1 v2 v2 v3 v3 */

                            punpckhbw mm1, mm1  ;v0 v0 v1 v1 v2 v2 v3 v3
                            movq [edi+8], mm1   ; move to memory v0 v1 v2 and v3
                            sub esi, 8
                            movq [edi], mm0     ; move to memory v4 v5 v6 and v7
                            punpckhbw mm1, mm1  ;v0 v0 v1 v1 v2 v2 v3 v3
                            movq [edi+8], mm1   ; move to memory v0 v1 v2 and v3
                            sub esi, 8
                            movq [edi], mm0     ; move to memory v4 v5 v6 and v7

-                           //sub esi, 4
+                           /*sub esi, 4 */

                            sub edi, 16
                            sub ecx, 8
                            jnz loop1_pass4
                            sub edi, 16
                            sub ecx, 8
                            jnz loop1_pass4


@@ -1502,8 +1531,8 @@ loop2_pass0:
                         }
                      }
 
                         }
                      }
 

-                     sptr -= (width_mmx*2 - 2);            // sign fixed
-                     dp -= (width_mmx*16 - 2);            // sign fixed
+                     sptr -= (width_mmx*2 - 2);            /* sign fixed */
+                     dp -= (width_mmx*16 - 2);            /* sign fixed */

                      for (i = width; i; i--)
                      {
                         png_byte v[8];
                      for (i = width; i; i--)
                      {
                         png_byte v[8];


@@ -1539,7 +1568,7 @@ loop2_pass2:
                            movq [edi], mm0
                            sub esi, 4
                            movq [edi + 8], mm1
                            movq [edi], mm0
                            sub esi, 4
                            movq [edi + 8], mm1

-                           //sub esi, 4
+                           /*sub esi, 4 */

                            sub edi, 16
                            sub ecx, 2
                            jnz loop2_pass2
                            sub edi, 16
                            sub ecx, 2
                            jnz loop2_pass2


@@ -1547,8 +1576,8 @@ loop2_pass2:
                         }
                      }
 
                         }
                      }
 

-                     sptr -= (width_mmx*2 - 2);            // sign fixed
-                     dp -= (width_mmx*8 - 2);            // sign fixed
+                     sptr -= (width_mmx*2 - 2);            /* sign fixed */
+                     dp -= (width_mmx*8 - 2);            /* sign fixed */

                      for (i = width; i; i--)
                      {
                         png_byte v[8];
                      for (i = width; i; i--)
                      {
                         png_byte v[8];


@@ -1562,7 +1591,7 @@ loop2_pass2:
                         }
                      }
                   }
                         }
                      }
                   }

-                  else if (width)  // pass == 4 or 5
+                  else if (width)  /* pass == 4 or 5 */

                   {
                      int width_mmx = ((width >> 1) << 1) ;
                      width -= width_mmx;
                   {
                      int width_mmx = ((width >> 1) << 1) ;
                      width -= width_mmx;


@@ -1587,8 +1616,8 @@ loop2_pass4:
                         }
                      }
 
                         }
                      }
 

-                     sptr -= (width_mmx*2 - 2);            // sign fixed
-                     dp -= (width_mmx*4 - 2);            // sign fixed
+                     sptr -= (width_mmx*2 - 2);            /* sign fixed */
+                     dp -= (width_mmx*4 - 2);            /* sign fixed */

                      for (i = width; i; i--)
                      {
                         png_byte v[8];
                      for (i = width; i; i--)
                      {
                         png_byte v[8];


@@ -1640,8 +1669,8 @@ loop4_pass0:
                         }
                      }
 
                         }
                      }
 

-                     sptr -= (width_mmx*4 - 4);            // sign fixed
-                     dp -= (width_mmx*32 - 4);            // sign fixed
+                     sptr -= (width_mmx*4 - 4);            /* sign fixed */
+                     dp -= (width_mmx*32 - 4);            /* sign fixed */

                      for (i = width; i; i--)
                      {
                         png_byte v[8];
                      for (i = width; i; i--)
                      {
                         png_byte v[8];


@@ -1685,8 +1714,8 @@ loop4_pass2:
                         }
                      }
 
                         }
                      }
 

-                     sptr -= (width_mmx*4 - 4);            // sign fixed
-                     dp -= (width_mmx*16 - 4);            // sign fixed
+                     sptr -= (width_mmx*4 - 4);            /* sign fixed */
+                     dp -= (width_mmx*16 - 4);            /* sign fixed */

                      for (i = width; i; i--)
                      {
                         png_byte v[8];
                      for (i = width; i; i--)
                      {
                         png_byte v[8];


@@ -1700,7 +1729,7 @@ loop4_pass2:
                         }
                      }
                   }
                         }
                      }
                   }

-                  else if (width)  // pass == 4 or 5
+                  else if (width)  /* pass == 4 or 5 */

                   {
                      int width_mmx = ((width >> 1) << 1) ;
                      width -= width_mmx;
                   {
                      int width_mmx = ((width >> 1) << 1) ;
                      width -= width_mmx;


@@ -1728,8 +1757,8 @@ loop4_pass4:
                         }
                      }
 
                         }
                      }
 

-                     sptr -= (width_mmx*4 - 4);          // sign fixed
-                     dp -= (width_mmx*8 - 4);            // sign fixed
+                     sptr -= (width_mmx*4 - 4);          /* sign fixed */
+                     dp -= (width_mmx*8 - 4);            /* sign fixed */

                      for (i = width; i; i--)
                      {
                         png_byte v[8];
                      for (i = width; i; i--)
                      {
                         png_byte v[8];


@@ -1874,8 +1903,8 @@ loop4_pass4:
       } /* end switch (row_info->pixel_depth) */
 
       row_info->width = final_width;
       } /* end switch (row_info->pixel_depth) */
 
       row_info->width = final_width;

-      row_info->rowbytes = ((final_width *
-         (png_uint_32)row_info->pixel_depth + 7) >> 3);
+
+      row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,final_width);

    }
 
 }
    }
 
 }


@@ -1883,8 +1912,8 @@ loop4_pass4:
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
 
 
 #endif /* PNG_READ_INTERLACING_SUPPORTED */
 
 

-// These variables are utilized in the functions below.  They are declared
-// globally here to ensure alignment on 8-byte boundaries.
+/* These variables are utilized in the functions below.  They are declared */
+/* globally here to ensure alignment on 8-byte boundaries. */

 
 union uAll {
    __int64 use;
 
 union uAll {
    __int64 use;


@@ -1894,7 +1923,7 @@ union uAll {
   ActiveMask, ActiveMask2, ActiveMaskEnd, ShiftBpp, ShiftRem;
 
 
   ActiveMask, ActiveMask2, ActiveMaskEnd, ShiftBpp, ShiftRem;
 
 

-// Optimized code for PNG Average filter decoder
+/* Optimized code for PNG Average filter decoder */

 void /* PRIVATE */
 png_read_filter_row_mmx_avg(png_row_infop row_info, png_bytep row
                             , png_bytep prev_row)
 void /* PRIVATE */
 png_read_filter_row_mmx_avg(png_row_infop row_info, png_bytep row
                             , png_bytep prev_row)


@@ -1902,141 +1931,141 @@ png_read_filter_row_mmx_avg(png_row_infop row_info, png_bytep row
    int bpp;
    png_uint_32 FullLength;
    png_uint_32 MMXLength;
    int bpp;
    png_uint_32 FullLength;
    png_uint_32 MMXLength;

-   //png_uint_32 len;
+   /*png_uint_32 len; */

    int diff;
 
    int diff;
 

-   bpp = (row_info->pixel_depth + 7) >> 3; // Get # bytes per pixel
-   FullLength  = row_info->rowbytes; // # of bytes to filter
+   bpp = (row_info->pixel_depth + 7) >> 3; /* Get # bytes per pixel */
+   FullLength  = row_info->rowbytes; /* # of bytes to filter */

    _asm {
    _asm {

-         // Init address pointers and offset
-         mov edi, row          // edi ==> Avg(x)
-         xor ebx, ebx          // ebx ==> x
+         /* Init address pointers and offset */
+         mov edi, row          /* edi ==> Avg(x) */
+         xor ebx, ebx          /* ebx ==> x */

          mov edx, edi
          mov edx, edi

-         mov esi, prev_row           // esi ==> Prior(x)
-         sub edx, bpp          // edx ==> Raw(x-bpp)
+         mov esi, prev_row           /* esi ==> Prior(x) */
+         sub edx, bpp          /* edx ==> Raw(x-bpp) */

 
          xor eax, eax
 
          xor eax, eax

-         // Compute the Raw value for the first bpp bytes
-         //    Raw(x) = Avg(x) + (Prior(x)/2)
+         /* Compute the Raw value for the first bpp bytes */
+         /*    Raw(x) = Avg(x) + (Prior(x)/2) */

 davgrlp:
 davgrlp:

-         mov al, [esi + ebx]   // Load al with Prior(x)
+         mov al, [esi + ebx]   /* Load al with Prior(x) */

          inc ebx
          inc ebx

-         shr al, 1             // divide by 2
-         add al, [edi+ebx-1]   // Add Avg(x); -1 to offset inc ebx
+         shr al, 1             /* divide by 2 */
+         add al, [edi+ebx-1]   /* Add Avg(x); -1 to offset inc ebx */

          cmp ebx, bpp
          cmp ebx, bpp

-         mov [edi+ebx-1], al    // Write back Raw(x);
-                            // mov does not affect flags; -1 to offset inc ebx
+         mov [edi+ebx-1], al    /* Write back Raw(x); */
+                            /* mov does not affect flags; -1 to offset inc ebx */

          jb davgrlp
          jb davgrlp

-         // get # of bytes to alignment
-         mov diff, edi         // take start of row
-         add diff, ebx         // add bpp
-         add diff, 0xf         // add 7 + 8 to incr past alignment boundary
-         and diff, 0xfffffff8  // mask to alignment boundary
-         sub diff, edi         // subtract from start ==> value ebx at alignment
+         /* get # of bytes to alignment */
+         mov diff, edi         /* take start of row */
+         add diff, ebx         /* add bpp */
+         add diff, 0xf         /* add 7 + 8 to incr past alignment boundary */
+         and diff, 0xfffffff8  /* mask to alignment boundary */
+         sub diff, edi         /* subtract from start ==> value ebx at alignment */

          jz davggo
          jz davggo

-         // fix alignment
-         // Compute the Raw value for the bytes upto the alignment boundary
-         //    Raw(x) = Avg(x) + ((Raw(x-bpp) + Prior(x))/2)
+         /* fix alignment */
+         /* Compute the Raw value for the bytes upto the alignment boundary */
+         /*    Raw(x) = Avg(x) + ((Raw(x-bpp) + Prior(x))/2) */

          xor ecx, ecx
 davglp1:
          xor eax, eax
          xor ecx, ecx
 davglp1:
          xor eax, eax

-         mov cl, [esi + ebx]        // load cl with Prior(x)
-         mov al, [edx + ebx]  // load al with Raw(x-bpp)
+         mov cl, [esi + ebx]        /* load cl with Prior(x) */
+         mov al, [edx + ebx]  /* load al with Raw(x-bpp) */

          add ax, cx
          inc ebx
          add ax, cx
          inc ebx

-         shr ax, 1            // divide by 2
-         add al, [edi+ebx-1]  // Add Avg(x); -1 to offset inc ebx
-         cmp ebx, diff              // Check if at alignment boundary
-         mov [edi+ebx-1], al        // Write back Raw(x);
-                            // mov does not affect flags; -1 to offset inc ebx
-         jb davglp1               // Repeat until at alignment boundary
+         shr ax, 1            /* divide by 2 */
+         add al, [edi+ebx-1]  /* Add Avg(x); -1 to offset inc ebx */
+         cmp ebx, diff              /* Check if at alignment boundary */
+         mov [edi+ebx-1], al        /* Write back Raw(x); */
+                            /* mov does not affect flags; -1 to offset inc ebx */
+         jb davglp1               /* Repeat until at alignment boundary */

 davggo:
          mov eax, FullLength
          mov ecx, eax
 davggo:
          mov eax, FullLength
          mov ecx, eax

-         sub eax, ebx          // subtract alignment fix
-         and eax, 0x00000007   // calc bytes over mult of 8
-         sub ecx, eax          // drop over bytes from original length
+         sub eax, ebx          /* subtract alignment fix */
+         and eax, 0x00000007   /* calc bytes over mult of 8 */
+         sub ecx, eax          /* drop over bytes from original length */

          mov MMXLength, ecx
          mov MMXLength, ecx

-   } // end _asm block
-   // Now do the math for the rest of the row
+   } /* end _asm block */
+   /* Now do the math for the rest of the row */

    switch ( bpp )
    {
       case 3:
       {
          ActiveMask.use  = 0x0000000000ffffff;
    switch ( bpp )
    {
       case 3:
       {
          ActiveMask.use  = 0x0000000000ffffff;

-         ShiftBpp.use = 24;    // == 3 * 8
-         ShiftRem.use = 40;    // == 64 - 24
+         ShiftBpp.use = 24;    /* == 3 * 8 */
+         ShiftRem.use = 40;    /* == 64 - 24 */

          _asm {
          _asm {

-            // Re-init address pointers and offset
+            /* Re-init address pointers and offset */

             movq mm7, ActiveMask
             movq mm7, ActiveMask

-            mov ebx, diff      // ebx ==> x = offset to alignment boundary
+            mov ebx, diff      /* ebx ==> x = offset to alignment boundary */

             movq mm5, LBCarryMask
             movq mm5, LBCarryMask

-            mov edi, row       // edi ==> Avg(x)
+            mov edi, row       /* edi ==> Avg(x) */

             movq mm4, HBClearMask
             movq mm4, HBClearMask

-            mov esi, prev_row        // esi ==> Prior(x)
-            // PRIME the pump (load the first Raw(x-bpp) data set
-            movq mm2, [edi + ebx - 8]  // Load previous aligned 8 bytes
-                               // (we correct position in loop below)
+            mov esi, prev_row        /* esi ==> Prior(x) */
+            /* PRIME the pump (load the first Raw(x-bpp) data set */
+            movq mm2, [edi + ebx - 8]  /* Load previous aligned 8 bytes */
+                               /* (we correct position in loop below) */

 davg3lp:
 davg3lp:

-            movq mm0, [edi + ebx]      // Load mm0 with Avg(x)
-            // Add (Prev_row/2) to Average
+            movq mm0, [edi + ebx]      /* Load mm0 with Avg(x) */
+            /* Add (Prev_row/2) to Average */

             movq mm3, mm5
             movq mm3, mm5

-            psrlq mm2, ShiftRem      // Correct position Raw(x-bpp) data
-            movq mm1, [esi + ebx]    // Load mm1 with Prior(x)
+            psrlq mm2, ShiftRem      /* Correct position Raw(x-bpp) data */
+            movq mm1, [esi + ebx]    /* Load mm1 with Prior(x) */

             movq mm6, mm7
             movq mm6, mm7

-            pand mm3, mm1      // get lsb for each prev_row byte
-            psrlq mm1, 1       // divide prev_row bytes by 2
-            pand  mm1, mm4     // clear invalid bit 7 of each byte
-            paddb mm0, mm1     // add (Prev_row/2) to Avg for each byte
-            // Add 1st active group (Raw(x-bpp)/2) to Average with LBCarry
-            movq mm1, mm3      // now use mm1 for getting LBCarrys
-            pand mm1, mm2      // get LBCarrys for each byte where both
-                               // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1       // divide raw bytes by 2
-            pand  mm2, mm4     // clear invalid bit 7 of each byte
-            paddb mm2, mm1     // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6      // Leave only Active Group 1 bytes to add to Avg
-            paddb mm0, mm2     // add (Raw/2) + LBCarrys to Avg for each Active
-                               //  byte
-            // Add 2nd active group (Raw(x-bpp)/2) to Average with LBCarry
-            psllq mm6, ShiftBpp  // shift the mm6 mask to cover bytes 3-5
-            movq mm2, mm0        // mov updated Raws to mm2
-            psllq mm2, ShiftBpp  // shift data to position correctly
-            movq mm1, mm3        // now use mm1 for getting LBCarrys
-            pand mm1, mm2      // get LBCarrys for each byte where both
-                               // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1       // divide raw bytes by 2
-            pand  mm2, mm4     // clear invalid bit 7 of each byte
-            paddb mm2, mm1     // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6      // Leave only Active Group 2 bytes to add to Avg
-            paddb mm0, mm2     // add (Raw/2) + LBCarrys to Avg for each Active
-                               //  byte
-
-            // Add 3rd active group (Raw(x-bpp)/2) to Average with LBCarry
-            psllq mm6, ShiftBpp  // shift the mm6 mask to cover the last two
-                                 // bytes
-            movq mm2, mm0        // mov updated Raws to mm2
-            psllq mm2, ShiftBpp  // shift data to position correctly
-                              // Data only needs to be shifted once here to
-                              // get the correct x-bpp offset.
-            movq mm1, mm3     // now use mm1 for getting LBCarrys
-            pand mm1, mm2     // get LBCarrys for each byte where both
-                              // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1      // divide raw bytes by 2
-            pand  mm2, mm4    // clear invalid bit 7 of each byte
-            paddb mm2, mm1    // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6     // Leave only Active Group 2 bytes to add to Avg
+            pand mm3, mm1      /* get lsb for each prev_row byte */
+            psrlq mm1, 1       /* divide prev_row bytes by 2 */
+            pand  mm1, mm4     /* clear invalid bit 7 of each byte */
+            paddb mm0, mm1     /* add (Prev_row/2) to Avg for each byte */
+            /* Add 1st active group (Raw(x-bpp)/2) to Average with LBCarry */
+            movq mm1, mm3      /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2      /* get LBCarrys for each byte where both */
+                               /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1       /* divide raw bytes by 2 */
+            pand  mm2, mm4     /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1     /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6      /* Leave only Active Group 1 bytes to add to Avg */
+            paddb mm0, mm2     /* add (Raw/2) + LBCarrys to Avg for each Active */
+                               /*  byte */
+            /* Add 2nd active group (Raw(x-bpp)/2) to Average with LBCarry */
+            psllq mm6, ShiftBpp  /* shift the mm6 mask to cover bytes 3-5 */
+            movq mm2, mm0        /* mov updated Raws to mm2 */
+            psllq mm2, ShiftBpp  /* shift data to position correctly */
+            movq mm1, mm3        /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2      /* get LBCarrys for each byte where both */
+                               /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1       /* divide raw bytes by 2 */
+            pand  mm2, mm4     /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1     /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6      /* Leave only Active Group 2 bytes to add to Avg */
+            paddb mm0, mm2     /* add (Raw/2) + LBCarrys to Avg for each Active */
+                               /*  byte */
+
+            /* Add 3rd active group (Raw(x-bpp)/2) to Average with LBCarry */
+            psllq mm6, ShiftBpp  /* shift the mm6 mask to cover the last two */
+                                 /* bytes */
+            movq mm2, mm0        /* mov updated Raws to mm2 */
+            psllq mm2, ShiftBpp  /* shift data to position correctly */
+                              /* Data only needs to be shifted once here to */
+                              /* get the correct x-bpp offset. */
+            movq mm1, mm3     /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2     /* get LBCarrys for each byte where both */
+                              /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1      /* divide raw bytes by 2 */
+            pand  mm2, mm4    /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1    /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6     /* Leave only Active Group 2 bytes to add to Avg */

             add ebx, 8
             add ebx, 8

-            paddb mm0, mm2    // add (Raw/2) + LBCarrys to Avg for each Active
-                              // byte
+            paddb mm0, mm2    /* add (Raw/2) + LBCarrys to Avg for each Active */
+                              /* byte */

 
 

-            // Now ready to write back to memory
+            /* Now ready to write back to memory */

             movq [edi + ebx - 8], mm0
             movq [edi + ebx - 8], mm0

-            // Move updated Raw(x) to use as Raw(x-bpp) for next loop
+            /* Move updated Raw(x) to use as Raw(x-bpp) for next loop */

             cmp ebx, MMXLength
             cmp ebx, MMXLength

-            movq mm2, mm0     // mov updated Raw(x) to mm2
+            movq mm2, mm0     /* mov updated Raw(x) to mm2 */

             jb davg3lp
             jb davg3lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       }
       break;
 


@@ -2045,314 +2074,314 @@ davg3lp:
       case 7:
       case 5:
       {
       case 7:
       case 5:
       {

-         ActiveMask.use  = 0xffffffffffffffff;  // use shift below to clear
-                                                // appropriate inactive bytes
+         ActiveMask.use  = 0xffffffffffffffff;  /* use shift below to clear */
+                                                /* appropriate inactive bytes */

          ShiftBpp.use = bpp << 3;
          ShiftRem.use = 64 - ShiftBpp.use;
          _asm {
             movq mm4, HBClearMask
          ShiftBpp.use = bpp << 3;
          ShiftRem.use = 64 - ShiftBpp.use;
          _asm {
             movq mm4, HBClearMask

-            // Re-init address pointers and offset
-            mov ebx, diff       // ebx ==> x = offset to alignment boundary
-            // Load ActiveMask and clear all bytes except for 1st active group
+            /* Re-init address pointers and offset */
+            mov ebx, diff       /* ebx ==> x = offset to alignment boundary */
+            /* Load ActiveMask and clear all bytes except for 1st active group */

             movq mm7, ActiveMask
             movq mm7, ActiveMask

-            mov edi, row         // edi ==> Avg(x)
+            mov edi, row         /* edi ==> Avg(x) */

             psrlq mm7, ShiftRem
             psrlq mm7, ShiftRem

-            mov esi, prev_row    // esi ==> Prior(x)
+            mov esi, prev_row    /* esi ==> Prior(x) */

             movq mm6, mm7
             movq mm5, LBCarryMask
             movq mm6, mm7
             movq mm5, LBCarryMask

-            psllq mm6, ShiftBpp  // Create mask for 2nd active group
-            // PRIME the pump (load the first Raw(x-bpp) data set
-            movq mm2, [edi + ebx - 8]  // Load previous aligned 8 bytes
-                                 // (we correct position in loop below)
+            psllq mm6, ShiftBpp  /* Create mask for 2nd active group */
+            /* PRIME the pump (load the first Raw(x-bpp) data set */
+            movq mm2, [edi + ebx - 8]  /* Load previous aligned 8 bytes */
+                                 /* (we correct position in loop below) */

 davg4lp:
             movq mm0, [edi + ebx]
 davg4lp:
             movq mm0, [edi + ebx]

-            psrlq mm2, ShiftRem  // shift data to position correctly
+            psrlq mm2, ShiftRem  /* shift data to position correctly */

             movq mm1, [esi + ebx]
             movq mm1, [esi + ebx]

-            // Add (Prev_row/2) to Average
+            /* Add (Prev_row/2) to Average */

             movq mm3, mm5
             movq mm3, mm5

-            pand mm3, mm1     // get lsb for each prev_row byte
-            psrlq mm1, 1      // divide prev_row bytes by 2
-            pand  mm1, mm4    // clear invalid bit 7 of each byte
-            paddb mm0, mm1    // add (Prev_row/2) to Avg for each byte
-            // Add 1st active group (Raw(x-bpp)/2) to Average with LBCarry
-            movq mm1, mm3     // now use mm1 for getting LBCarrys
-            pand mm1, mm2     // get LBCarrys for each byte where both
-                              // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1      // divide raw bytes by 2
-            pand  mm2, mm4    // clear invalid bit 7 of each byte
-            paddb mm2, mm1    // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm7     // Leave only Active Group 1 bytes to add to Avg
-            paddb mm0, mm2    // add (Raw/2) + LBCarrys to Avg for each Active
-                              // byte
-            // Add 2nd active group (Raw(x-bpp)/2) to Average with LBCarry
-            movq mm2, mm0     // mov updated Raws to mm2
-            psllq mm2, ShiftBpp // shift data to position correctly
+            pand mm3, mm1     /* get lsb for each prev_row byte */
+            psrlq mm1, 1      /* divide prev_row bytes by 2 */
+            pand  mm1, mm4    /* clear invalid bit 7 of each byte */
+            paddb mm0, mm1    /* add (Prev_row/2) to Avg for each byte */
+            /* Add 1st active group (Raw(x-bpp)/2) to Average with LBCarry */
+            movq mm1, mm3     /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2     /* get LBCarrys for each byte where both */
+                              /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1      /* divide raw bytes by 2 */
+            pand  mm2, mm4    /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1    /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm7     /* Leave only Active Group 1 bytes to add to Avg */
+            paddb mm0, mm2    /* add (Raw/2) + LBCarrys to Avg for each Active */
+                              /* byte */
+            /* Add 2nd active group (Raw(x-bpp)/2) to Average with LBCarry */
+            movq mm2, mm0     /* mov updated Raws to mm2 */
+            psllq mm2, ShiftBpp /* shift data to position correctly */

             add ebx, 8
             add ebx, 8

-            movq mm1, mm3     // now use mm1 for getting LBCarrys
-            pand mm1, mm2     // get LBCarrys for each byte where both
-                              // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1      // divide raw bytes by 2
-            pand  mm2, mm4    // clear invalid bit 7 of each byte
-            paddb mm2, mm1    // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6     // Leave only Active Group 2 bytes to add to Avg
-            paddb mm0, mm2    // add (Raw/2) + LBCarrys to Avg for each Active
-                              // byte
+            movq mm1, mm3     /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2     /* get LBCarrys for each byte where both */
+                              /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1      /* divide raw bytes by 2 */
+            pand  mm2, mm4    /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1    /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6     /* Leave only Active Group 2 bytes to add to Avg */
+            paddb mm0, mm2    /* add (Raw/2) + LBCarrys to Avg for each Active */
+                              /* byte */

             cmp ebx, MMXLength
             cmp ebx, MMXLength

-            // Now ready to write back to memory
+            /* Now ready to write back to memory */

             movq [edi + ebx - 8], mm0
             movq [edi + ebx - 8], mm0

-            // Prep Raw(x-bpp) for next loop
-            movq mm2, mm0     // mov updated Raws to mm2
+            /* Prep Raw(x-bpp) for next loop */
+            movq mm2, mm0     /* mov updated Raws to mm2 */

             jb davg4lp
             jb davg4lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
       case 2:
       {
          ActiveMask.use  = 0x000000000000ffff;
       }
       break;
       case 2:
       {
          ActiveMask.use  = 0x000000000000ffff;

-         ShiftBpp.use = 16;   // == 2 * 8     [BUGFIX]
-         ShiftRem.use = 48;   // == 64 - 16   [BUGFIX]
+         ShiftBpp.use = 16;   /* == 2 * 8     [BUGFIX] */
+         ShiftRem.use = 48;   /* == 64 - 16   [BUGFIX] */

          _asm {
          _asm {

-            // Load ActiveMask
+            /* Load ActiveMask */

             movq mm7, ActiveMask
             movq mm7, ActiveMask

-            // Re-init address pointers and offset
-            mov ebx, diff     // ebx ==> x = offset to alignment boundary
+            /* Re-init address pointers and offset */
+            mov ebx, diff     /* ebx ==> x = offset to alignment boundary */

             movq mm5, LBCarryMask
             movq mm5, LBCarryMask

-            mov edi, row      // edi ==> Avg(x)
+            mov edi, row      /* edi ==> Avg(x) */

             movq mm4, HBClearMask
             movq mm4, HBClearMask

-            mov esi, prev_row  // esi ==> Prior(x)
-            // PRIME the pump (load the first Raw(x-bpp) data set
-            movq mm2, [edi + ebx - 8]  // Load previous aligned 8 bytes
-                              // (we correct position in loop below)
+            mov esi, prev_row  /* esi ==> Prior(x) */
+            /* PRIME the pump (load the first Raw(x-bpp) data set */
+            movq mm2, [edi + ebx - 8]  /* Load previous aligned 8 bytes */
+                              /* (we correct position in loop below) */

 davg2lp:
             movq mm0, [edi + ebx]
 davg2lp:
             movq mm0, [edi + ebx]

-            psrlq mm2, ShiftRem  // shift data to position correctly   [BUGFIX]
+            psrlq mm2, ShiftRem  /* shift data to position correctly   [BUGFIX] */

             movq mm1, [esi + ebx]
             movq mm1, [esi + ebx]

-            // Add (Prev_row/2) to Average
+            /* Add (Prev_row/2) to Average */

             movq mm3, mm5
             movq mm3, mm5

-            pand mm3, mm1     // get lsb for each prev_row byte
-            psrlq mm1, 1      // divide prev_row bytes by 2
-            pand  mm1, mm4    // clear invalid bit 7 of each byte
+            pand mm3, mm1     /* get lsb for each prev_row byte */
+            psrlq mm1, 1      /* divide prev_row bytes by 2 */
+            pand  mm1, mm4    /* clear invalid bit 7 of each byte */

             movq mm6, mm7
             movq mm6, mm7

-            paddb mm0, mm1    // add (Prev_row/2) to Avg for each byte
-            // Add 1st active group (Raw(x-bpp)/2) to Average with LBCarry
-            movq mm1, mm3     // now use mm1 for getting LBCarrys
-            pand mm1, mm2     // get LBCarrys for each byte where both
-                              // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1      // divide raw bytes by 2
-            pand  mm2, mm4    // clear invalid bit 7 of each byte
-            paddb mm2, mm1    // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6     // Leave only Active Group 1 bytes to add to Avg
-            paddb mm0, mm2 // add (Raw/2) + LBCarrys to Avg for each Active byte
-            // Add 2nd active group (Raw(x-bpp)/2) to Average with LBCarry
-            psllq mm6, ShiftBpp // shift the mm6 mask to cover bytes 2 & 3
-            movq mm2, mm0       // mov updated Raws to mm2
-            psllq mm2, ShiftBpp // shift data to position correctly
-            movq mm1, mm3       // now use mm1 for getting LBCarrys
-            pand mm1, mm2       // get LBCarrys for each byte where both
-                                // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1        // divide raw bytes by 2
-            pand  mm2, mm4      // clear invalid bit 7 of each byte
-            paddb mm2, mm1      // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6       // Leave only Active Group 2 bytes to add to Avg
-            paddb mm0, mm2 // add (Raw/2) + LBCarrys to Avg for each Active byte
-
-            // Add rdd active group (Raw(x-bpp)/2) to Average with LBCarry
-            psllq mm6, ShiftBpp // shift the mm6 mask to cover bytes 4 & 5
-            movq mm2, mm0       // mov updated Raws to mm2
-            psllq mm2, ShiftBpp // shift data to position correctly
-                                // Data only needs to be shifted once here to
-                                // get the correct x-bpp offset.
-            movq mm1, mm3       // now use mm1 for getting LBCarrys
-            pand mm1, mm2       // get LBCarrys for each byte where both
-                                // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1        // divide raw bytes by 2
-            pand  mm2, mm4      // clear invalid bit 7 of each byte
-            paddb mm2, mm1      // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6       // Leave only Active Group 2 bytes to add to Avg
-            paddb mm0, mm2 // add (Raw/2) + LBCarrys to Avg for each Active byte
-
-            // Add 4th active group (Raw(x-bpp)/2) to Average with LBCarry
-            psllq mm6, ShiftBpp  // shift the mm6 mask to cover bytes 6 & 7
-            movq mm2, mm0        // mov updated Raws to mm2
-            psllq mm2, ShiftBpp  // shift data to position correctly
-                                 // Data only needs to be shifted once here to
-                                 // get the correct x-bpp offset.
+            paddb mm0, mm1    /* add (Prev_row/2) to Avg for each byte */
+            /* Add 1st active group (Raw(x-bpp)/2) to Average with LBCarry */
+            movq mm1, mm3     /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2     /* get LBCarrys for each byte where both */
+                              /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1      /* divide raw bytes by 2 */
+            pand  mm2, mm4    /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1    /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6     /* Leave only Active Group 1 bytes to add to Avg */
+            paddb mm0, mm2 /* add (Raw/2) + LBCarrys to Avg for each Active byte */
+            /* Add 2nd active group (Raw(x-bpp)/2) to Average with LBCarry */
+            psllq mm6, ShiftBpp /* shift the mm6 mask to cover bytes 2 & 3 */
+            movq mm2, mm0       /* mov updated Raws to mm2 */
+            psllq mm2, ShiftBpp /* shift data to position correctly */
+            movq mm1, mm3       /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2       /* get LBCarrys for each byte where both */
+                                /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1        /* divide raw bytes by 2 */
+            pand  mm2, mm4      /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1      /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6       /* Leave only Active Group 2 bytes to add to Avg */
+            paddb mm0, mm2 /* add (Raw/2) + LBCarrys to Avg for each Active byte */
+
+            /* Add rdd active group (Raw(x-bpp)/2) to Average with LBCarry */
+            psllq mm6, ShiftBpp /* shift the mm6 mask to cover bytes 4 & 5 */
+            movq mm2, mm0       /* mov updated Raws to mm2 */
+            psllq mm2, ShiftBpp /* shift data to position correctly */
+                                /* Data only needs to be shifted once here to */
+                                /* get the correct x-bpp offset. */
+            movq mm1, mm3       /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2       /* get LBCarrys for each byte where both */
+                                /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1        /* divide raw bytes by 2 */
+            pand  mm2, mm4      /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1      /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6       /* Leave only Active Group 2 bytes to add to Avg */
+            paddb mm0, mm2 /* add (Raw/2) + LBCarrys to Avg for each Active byte */
+
+            /* Add 4th active group (Raw(x-bpp)/2) to Average with LBCarry */
+            psllq mm6, ShiftBpp  /* shift the mm6 mask to cover bytes 6 & 7 */
+            movq mm2, mm0        /* mov updated Raws to mm2 */
+            psllq mm2, ShiftBpp  /* shift data to position correctly */
+                                 /* Data only needs to be shifted once here to */
+                                 /* get the correct x-bpp offset. */

             add ebx, 8
             add ebx, 8

-            movq mm1, mm3    // now use mm1 for getting LBCarrys
-            pand mm1, mm2    // get LBCarrys for each byte where both
-                             // lsb's were == 1 (Only valid for active group)
-            psrlq mm2, 1     // divide raw bytes by 2
-            pand  mm2, mm4   // clear invalid bit 7 of each byte
-            paddb mm2, mm1   // add LBCarrys to (Raw(x-bpp)/2) for each byte
-            pand mm2, mm6    // Leave only Active Group 2 bytes to add to Avg
-            paddb mm0, mm2 // add (Raw/2) + LBCarrys to Avg for each Active byte
+            movq mm1, mm3    /* now use mm1 for getting LBCarrys */
+            pand mm1, mm2    /* get LBCarrys for each byte where both */
+                             /* lsb's were == 1 (Only valid for active group) */
+            psrlq mm2, 1     /* divide raw bytes by 2 */
+            pand  mm2, mm4   /* clear invalid bit 7 of each byte */
+            paddb mm2, mm1   /* add LBCarrys to (Raw(x-bpp)/2) for each byte */
+            pand mm2, mm6    /* Leave only Active Group 2 bytes to add to Avg */
+            paddb mm0, mm2 /* add (Raw/2) + LBCarrys to Avg for each Active byte */

 
             cmp ebx, MMXLength
 
             cmp ebx, MMXLength

-            // Now ready to write back to memory
+            /* Now ready to write back to memory */

             movq [edi + ebx - 8], mm0
             movq [edi + ebx - 8], mm0

-            // Prep Raw(x-bpp) for next loop
-            movq mm2, mm0    // mov updated Raws to mm2
+            /* Prep Raw(x-bpp) for next loop */
+            movq mm2, mm0    /* mov updated Raws to mm2 */

             jb davg2lp
             jb davg2lp

-        } // end _asm block
+        } /* end _asm block */

       }
       break;
 
       }
       break;
 

-      case 1:                 // bpp == 1
+      case 1:                 /* bpp == 1 */

       {
          _asm {
       {
          _asm {

-            // Re-init address pointers and offset
-            mov ebx, diff     // ebx ==> x = offset to alignment boundary
-            mov edi, row      // edi ==> Avg(x)
-            cmp ebx, FullLength  // Test if offset at end of array
+            /* Re-init address pointers and offset */
+            mov ebx, diff     /* ebx ==> x = offset to alignment boundary */
+            mov edi, row      /* edi ==> Avg(x) */
+            cmp ebx, FullLength  /* Test if offset at end of array */

             jnb davg1end
             jnb davg1end

-            // Do Paeth decode for remaining bytes
-            mov esi, prev_row    // esi ==> Prior(x)
+            /* Do Paeth decode for remaining bytes */
+            mov esi, prev_row    /* esi ==> Prior(x) */

             mov edx, edi
             mov edx, edi

-            xor ecx, ecx         // zero ecx before using cl & cx in loop below
-            sub edx, bpp         // edx ==> Raw(x-bpp)
+            xor ecx, ecx         /* zero ecx before using cl & cx in loop below */
+            sub edx, bpp         /* edx ==> Raw(x-bpp) */

 davg1lp:
 davg1lp:

-            // Raw(x) = Avg(x) + ((Raw(x-bpp) + Prior(x))/2)
+            /* Raw(x) = Avg(x) + ((Raw(x-bpp) + Prior(x))/2) */

             xor eax, eax
             xor eax, eax

-            mov cl, [esi + ebx]  // load cl with Prior(x)
-            mov al, [edx + ebx]  // load al with Raw(x-bpp)
+            mov cl, [esi + ebx]  /* load cl with Prior(x) */
+            mov al, [edx + ebx]  /* load al with Raw(x-bpp) */

             add ax, cx
             inc ebx
             add ax, cx
             inc ebx

-            shr ax, 1            // divide by 2
-            add al, [edi+ebx-1]  // Add Avg(x); -1 to offset inc ebx
-            cmp ebx, FullLength  // Check if at end of array
-            mov [edi+ebx-1], al  // Write back Raw(x);
-                         // mov does not affect flags; -1 to offset inc ebx
+            shr ax, 1            /* divide by 2 */
+            add al, [edi+ebx-1]  /* Add Avg(x); -1 to offset inc ebx */
+            cmp ebx, FullLength  /* Check if at end of array */
+            mov [edi+ebx-1], al  /* Write back Raw(x); */
+                         /* mov does not affect flags; -1 to offset inc ebx */

             jb davg1lp
 davg1end:
             jb davg1lp
 davg1end:

-         } // end _asm block
+         } /* end _asm block */

       }
       return;
 
       }
       return;
 

-      case 8:             // bpp == 8
+      case 8:             /* bpp == 8 */

       {
          _asm {
       {
          _asm {

-            // Re-init address pointers and offset
-            mov ebx, diff           // ebx ==> x = offset to alignment boundary
+            /* Re-init address pointers and offset */
+            mov ebx, diff           /* ebx ==> x = offset to alignment boundary */

             movq mm5, LBCarryMask
             movq mm5, LBCarryMask

-            mov edi, row            // edi ==> Avg(x)
+            mov edi, row            /* edi ==> Avg(x) */

             movq mm4, HBClearMask
             movq mm4, HBClearMask

-            mov esi, prev_row       // esi ==> Prior(x)
-            // PRIME the pump (load the first Raw(x-bpp) data set
-            movq mm2, [edi + ebx - 8]  // Load previous aligned 8 bytes
-                                // (NO NEED to correct position in loop below)
+            mov esi, prev_row       /* esi ==> Prior(x) */
+            /* PRIME the pump (load the first Raw(x-bpp) data set */
+            movq mm2, [edi + ebx - 8]  /* Load previous aligned 8 bytes */
+                                /* (NO NEED to correct position in loop below) */

 davg8lp:
             movq mm0, [edi + ebx]
             movq mm3, mm5
             movq mm1, [esi + ebx]
             add ebx, 8
 davg8lp:
             movq mm0, [edi + ebx]
             movq mm3, mm5
             movq mm1, [esi + ebx]
             add ebx, 8

-            pand mm3, mm1       // get lsb for each prev_row byte
-            psrlq mm1, 1        // divide prev_row bytes by 2
-            pand mm3, mm2       // get LBCarrys for each byte where both
-                                // lsb's were == 1
-            psrlq mm2, 1        // divide raw bytes by 2
-            pand  mm1, mm4      // clear invalid bit 7 of each byte
-            paddb mm0, mm3      // add LBCarrys to Avg for each byte
-            pand  mm2, mm4      // clear invalid bit 7 of each byte
-            paddb mm0, mm1      // add (Prev_row/2) to Avg for each byte
-            paddb mm0, mm2      // add (Raw/2) to Avg for each byte
+            pand mm3, mm1       /* get lsb for each prev_row byte */
+            psrlq mm1, 1        /* divide prev_row bytes by 2 */
+            pand mm3, mm2       /* get LBCarrys for each byte where both */
+                                /* lsb's were == 1 */
+            psrlq mm2, 1        /* divide raw bytes by 2 */
+            pand  mm1, mm4      /* clear invalid bit 7 of each byte */
+            paddb mm0, mm3      /* add LBCarrys to Avg for each byte */
+            pand  mm2, mm4      /* clear invalid bit 7 of each byte */
+            paddb mm0, mm1      /* add (Prev_row/2) to Avg for each byte */
+            paddb mm0, mm2      /* add (Raw/2) to Avg for each byte */

             cmp ebx, MMXLength
             movq [edi + ebx - 8], mm0
             cmp ebx, MMXLength
             movq [edi + ebx - 8], mm0

-            movq mm2, mm0       // reuse as Raw(x-bpp)
+            movq mm2, mm0       /* reuse as Raw(x-bpp) */

             jb davg8lp
             jb davg8lp

-        } // end _asm block
+        } /* end _asm block */

       }
       break;
       }
       break;

-      default:                  // bpp greater than 8
+      default:                  /* bpp greater than 8 */

       {
         _asm {
             movq mm5, LBCarryMask
       {
         _asm {
             movq mm5, LBCarryMask

-            // Re-init address pointers and offset
-            mov ebx, diff       // ebx ==> x = offset to alignment boundary
-            mov edi, row        // edi ==> Avg(x)
+            /* Re-init address pointers and offset */
+            mov ebx, diff       /* ebx ==> x = offset to alignment boundary */
+            mov edi, row        /* edi ==> Avg(x) */

             movq mm4, HBClearMask
             mov edx, edi
             movq mm4, HBClearMask
             mov edx, edi

-            mov esi, prev_row   // esi ==> Prior(x)
-            sub edx, bpp        // edx ==> Raw(x-bpp)
+            mov esi, prev_row   /* esi ==> Prior(x) */
+            sub edx, bpp        /* edx ==> Raw(x-bpp) */

 davgAlp:
             movq mm0, [edi + ebx]
             movq mm3, mm5
             movq mm1, [esi + ebx]
 davgAlp:
             movq mm0, [edi + ebx]
             movq mm3, mm5
             movq mm1, [esi + ebx]

-            pand mm3, mm1       // get lsb for each prev_row byte
+            pand mm3, mm1       /* get lsb for each prev_row byte */

             movq mm2, [edx + ebx]
             movq mm2, [edx + ebx]

-            psrlq mm1, 1        // divide prev_row bytes by 2
-            pand mm3, mm2       // get LBCarrys for each byte where both
-                                // lsb's were == 1
-            psrlq mm2, 1        // divide raw bytes by 2
-            pand  mm1, mm4      // clear invalid bit 7 of each byte
-            paddb mm0, mm3      // add LBCarrys to Avg for each byte
-            pand  mm2, mm4      // clear invalid bit 7 of each byte
-            paddb mm0, mm1      // add (Prev_row/2) to Avg for each byte
+            psrlq mm1, 1        /* divide prev_row bytes by 2 */
+            pand mm3, mm2       /* get LBCarrys for each byte where both */
+                                /* lsb's were == 1 */
+            psrlq mm2, 1        /* divide raw bytes by 2 */
+            pand  mm1, mm4      /* clear invalid bit 7 of each byte */
+            paddb mm0, mm3      /* add LBCarrys to Avg for each byte */
+            pand  mm2, mm4      /* clear invalid bit 7 of each byte */
+            paddb mm0, mm1      /* add (Prev_row/2) to Avg for each byte */

             add ebx, 8
             add ebx, 8

-            paddb mm0, mm2      // add (Raw/2) to Avg for each byte
+            paddb mm0, mm2      /* add (Raw/2) to Avg for each byte */

             cmp ebx, MMXLength
             movq [edi + ebx - 8], mm0
             jb davgAlp
             cmp ebx, MMXLength
             movq [edi + ebx - 8], mm0
             jb davgAlp

-        } // end _asm block
+        } /* end _asm block */

       }
       break;
       }
       break;

-   }                         // end switch ( bpp )
+   }                         /* end switch ( bpp ) */

 
    _asm {
 
    _asm {

-         // MMX acceleration complete now do clean-up
-         // Check if any remaining bytes left to decode
-         mov ebx, MMXLength    // ebx ==> x = offset bytes remaining after MMX
-         mov edi, row          // edi ==> Avg(x)
-         cmp ebx, FullLength   // Test if offset at end of array
+         /* MMX acceleration complete now do clean-up */
+         /* Check if any remaining bytes left to decode */
+         mov ebx, MMXLength    /* ebx ==> x = offset bytes remaining after MMX */
+         mov edi, row          /* edi ==> Avg(x) */
+         cmp ebx, FullLength   /* Test if offset at end of array */

          jnb davgend
          jnb davgend

-         // Do Paeth decode for remaining bytes
-         mov esi, prev_row     // esi ==> Prior(x)
+         /* Do Paeth decode for remaining bytes */
+         mov esi, prev_row     /* esi ==> Prior(x) */

          mov edx, edi
          mov edx, edi

-         xor ecx, ecx          // zero ecx before using cl & cx in loop below
-         sub edx, bpp          // edx ==> Raw(x-bpp)
+         xor ecx, ecx          /* zero ecx before using cl & cx in loop below */
+         sub edx, bpp          /* edx ==> Raw(x-bpp) */

 davglp2:
 davglp2:

-         // Raw(x) = Avg(x) + ((Raw(x-bpp) + Prior(x))/2)
+         /* Raw(x) = Avg(x) + ((Raw(x-bpp) + Prior(x))/2) */

          xor eax, eax
          xor eax, eax

-         mov cl, [esi + ebx]   // load cl with Prior(x)
-         mov al, [edx + ebx]   // load al with Raw(x-bpp)
+         mov cl, [esi + ebx]   /* load cl with Prior(x) */
+         mov al, [edx + ebx]   /* load al with Raw(x-bpp) */

          add ax, cx
          inc ebx
          add ax, cx
          inc ebx

-         shr ax, 1              // divide by 2
-         add al, [edi+ebx-1]    // Add Avg(x); -1 to offset inc ebx
-         cmp ebx, FullLength    // Check if at end of array
-         mov [edi+ebx-1], al    // Write back Raw(x);
-                          // mov does not affect flags; -1 to offset inc ebx
+         shr ax, 1              /* divide by 2 */
+         add al, [edi+ebx-1]    /* Add Avg(x); -1 to offset inc ebx */
+         cmp ebx, FullLength    /* Check if at end of array */
+         mov [edi+ebx-1], al    /* Write back Raw(x); */
+                          /* mov does not affect flags; -1 to offset inc ebx */

          jb davglp2
 davgend:
          jb davglp2
 davgend:

-         emms             // End MMX instructions; prep for possible FP instrs.
-   } // end _asm block
+         emms             /* End MMX instructions; prep for possible FP instrs. */
+   } /* end _asm block */

 }
 
 }
 

-// Optimized code for PNG Paeth filter decoder
+/* Optimized code for PNG Paeth filter decoder */

 void /* PRIVATE */
 png_read_filter_row_mmx_paeth(png_row_infop row_info, png_bytep row,
                               png_bytep prev_row)
 {
    png_uint_32 FullLength;
    png_uint_32 MMXLength;
 void /* PRIVATE */
 png_read_filter_row_mmx_paeth(png_row_infop row_info, png_bytep row,
                               png_bytep prev_row)
 {
    png_uint_32 FullLength;
    png_uint_32 MMXLength;

-   //png_uint_32 len;
+   /*png_uint_32 len; */

    int bpp;
    int diff;
    int bpp;
    int diff;

-   //int ptemp;
+   /*int ptemp; */

    int patemp, pbtemp, pctemp;
 
    int patemp, pbtemp, pctemp;
 

-   bpp = (row_info->pixel_depth + 7) >> 3; // Get # bytes per pixel
-   FullLength  = row_info->rowbytes; // # of bytes to filter
+   bpp = (row_info->pixel_depth + 7) >> 3; /* Get # bytes per pixel */
+   FullLength  = row_info->rowbytes; /* # of bytes to filter */

    _asm
    {
    _asm
    {

-         xor ebx, ebx        // ebx ==> x offset
+         xor ebx, ebx        /* ebx ==> x offset */

          mov edi, row
          mov edi, row

-         xor edx, edx        // edx ==> x-bpp offset
+         xor edx, edx        /* edx ==> x-bpp offset */

          mov esi, prev_row
          xor eax, eax
 
          mov esi, prev_row
          xor eax, eax
 

-         // Compute the Raw value for the first bpp bytes
-         // Note: the formula works out to be always
-         //   Paeth(x) = Raw(x) + Prior(x)      where x < bpp
+         /* Compute the Raw value for the first bpp bytes */
+         /* Note: the formula works out to be always */
+         /*   Paeth(x) = Raw(x) + Prior(x)      where x < bpp */

 dpthrlp:
          mov al, [edi + ebx]
          add al, [esi + ebx]
 dpthrlp:
          mov al, [edi + ebx]
          add al, [esi + ebx]


@@ -2360,290 +2389,290 @@ dpthrlp:
          cmp ebx, bpp
          mov [edi + ebx - 1], al
          jb dpthrlp
          cmp ebx, bpp
          mov [edi + ebx - 1], al
          jb dpthrlp

-         // get # of bytes to alignment
-         mov diff, edi         // take start of row
-         add diff, ebx         // add bpp
+         /* get # of bytes to alignment */
+         mov diff, edi         /* take start of row */
+         add diff, ebx         /* add bpp */

          xor ecx, ecx
          xor ecx, ecx

-         add diff, 0xf         // add 7 + 8 to incr past alignment boundary
-         and diff, 0xfffffff8  // mask to alignment boundary
-         sub diff, edi         // subtract from start ==> value ebx at alignment
+         add diff, 0xf         /* add 7 + 8 to incr past alignment boundary */
+         and diff, 0xfffffff8  /* mask to alignment boundary */
+         sub diff, edi         /* subtract from start ==> value ebx at alignment */

          jz dpthgo
          jz dpthgo

-         // fix alignment
+         /* fix alignment */

 dpthlp1:
          xor eax, eax
 dpthlp1:
          xor eax, eax

-         // pav = p - a = (a + b - c) - a = b - c
-         mov al, [esi + ebx]   // load Prior(x) into al
-         mov cl, [esi + edx]   // load Prior(x-bpp) into cl
-         sub eax, ecx          // subtract Prior(x-bpp)
-         mov patemp, eax       // Save pav for later use
+         /* pav = p - a = (a + b - c) - a = b - c */
+         mov al, [esi + ebx]   /* load Prior(x) into al */
+         mov cl, [esi + edx]   /* load Prior(x-bpp) into cl */
+         sub eax, ecx          /* subtract Prior(x-bpp) */
+         mov patemp, eax       /* Save pav for later use */

          xor eax, eax
          xor eax, eax

-         // pbv = p - b = (a + b - c) - b = a - c
-         mov al, [edi + edx]   // load Raw(x-bpp) into al
-         sub eax, ecx          // subtract Prior(x-bpp)
+         /* pbv = p - b = (a + b - c) - b = a - c */
+         mov al, [edi + edx]   /* load Raw(x-bpp) into al */
+         sub eax, ecx          /* subtract Prior(x-bpp) */

          mov ecx, eax
          mov ecx, eax

-         // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
-         add eax, patemp       // pcv = pav + pbv
-         // pc = abs(pcv)
+         /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */
+         add eax, patemp       /* pcv = pav + pbv */
+         /* pc = abs(pcv) */

          test eax, 0x80000000
          jz dpthpca
          test eax, 0x80000000
          jz dpthpca

-         neg eax               // reverse sign of neg values
+         neg eax               /* reverse sign of neg values */

 dpthpca:
 dpthpca:

-         mov pctemp, eax       // save pc for later use
-         // pb = abs(pbv)
+         mov pctemp, eax       /* save pc for later use */
+         /* pb = abs(pbv) */

          test ecx, 0x80000000
          jz dpthpba
          test ecx, 0x80000000
          jz dpthpba

-         neg ecx               // reverse sign of neg values
+         neg ecx               /* reverse sign of neg values */

 dpthpba:
 dpthpba:

-         mov pbtemp, ecx       // save pb for later use
-         // pa = abs(pav)
+         mov pbtemp, ecx       /* save pb for later use */
+         /* pa = abs(pav) */

          mov eax, patemp
          test eax, 0x80000000
          jz dpthpaa
          mov eax, patemp
          test eax, 0x80000000
          jz dpthpaa

-         neg eax               // reverse sign of neg values
+         neg eax               /* reverse sign of neg values */

 dpthpaa:
 dpthpaa:

-         mov patemp, eax       // save pa for later use
-         // test if pa <= pb
+         mov patemp, eax       /* save pa for later use */
+         /* test if pa <= pb */

          cmp eax, ecx
          jna dpthabb
          cmp eax, ecx
          jna dpthabb

-         // pa > pb; now test if pb <= pc
+         /* pa > pb; now test if pb <= pc */

          cmp ecx, pctemp
          jna dpthbbc
          cmp ecx, pctemp
          jna dpthbbc

-         // pb > pc; Raw(x) = Paeth(x) + Prior(x-bpp)
-         mov cl, [esi + edx]  // load Prior(x-bpp) into cl
+         /* pb > pc; Raw(x) = Paeth(x) + Prior(x-bpp) */
+         mov cl, [esi + edx]  /* load Prior(x-bpp) into cl */

          jmp dpthpaeth
 dpthbbc:
          jmp dpthpaeth
 dpthbbc:

-         // pb <= pc; Raw(x) = Paeth(x) + Prior(x)
-         mov cl, [esi + ebx]   // load Prior(x) into cl
+         /* pb <= pc; Raw(x) = Paeth(x) + Prior(x) */
+         mov cl, [esi + ebx]   /* load Prior(x) into cl */

          jmp dpthpaeth
 dpthabb:
          jmp dpthpaeth
 dpthabb:

-         // pa <= pb; now test if pa <= pc
+         /* pa <= pb; now test if pa <= pc */

          cmp eax, pctemp
          jna dpthabc
          cmp eax, pctemp
          jna dpthabc

-         // pa > pc; Raw(x) = Paeth(x) + Prior(x-bpp)
-         mov cl, [esi + edx]  // load Prior(x-bpp) into cl
+         /* pa > pc; Raw(x) = Paeth(x) + Prior(x-bpp) */
+         mov cl, [esi + edx]  /* load Prior(x-bpp) into cl */

          jmp dpthpaeth
 dpthabc:
          jmp dpthpaeth
 dpthabc:

-         // pa <= pc; Raw(x) = Paeth(x) + Raw(x-bpp)
-         mov cl, [edi + edx]  // load Raw(x-bpp) into cl
+         /* pa <= pc; Raw(x) = Paeth(x) + Raw(x-bpp) */
+         mov cl, [edi + edx]  /* load Raw(x-bpp) into cl */

 dpthpaeth:
          inc ebx
          inc edx
 dpthpaeth:
          inc ebx
          inc edx

-         // Raw(x) = (Paeth(x) + Paeth_Predictor( a, b, c )) mod 256
+         /* Raw(x) = (Paeth(x) + Paeth_Predictor( a, b, c )) mod 256 */

          add [edi + ebx - 1], cl
          cmp ebx, diff
          jb dpthlp1
 dpthgo:
          mov ecx, FullLength
          mov eax, ecx
          add [edi + ebx - 1], cl
          cmp ebx, diff
          jb dpthlp1
 dpthgo:
          mov ecx, FullLength
          mov eax, ecx

-         sub eax, ebx          // subtract alignment fix
-         and eax, 0x00000007   // calc bytes over mult of 8
-         sub ecx, eax          // drop over bytes from original length
+         sub eax, ebx          /* subtract alignment fix */
+         and eax, 0x00000007   /* calc bytes over mult of 8 */
+         sub ecx, eax          /* drop over bytes from original length */

          mov MMXLength, ecx
          mov MMXLength, ecx

-   } // end _asm block
-   // Now do the math for the rest of the row
+   } /* end _asm block */
+   /* Now do the math for the rest of the row */

    switch ( bpp )
    {
       case 3:
       {
          ActiveMask.use = 0x0000000000ffffff;
          ActiveMaskEnd.use = 0xffff000000000000;
    switch ( bpp )
    {
       case 3:
       {
          ActiveMask.use = 0x0000000000ffffff;
          ActiveMaskEnd.use = 0xffff000000000000;

-         ShiftBpp.use = 24;    // == bpp(3) * 8
-         ShiftRem.use = 40;    // == 64 - 24
+         ShiftBpp.use = 24;    /* == bpp(3) * 8 */
+         ShiftRem.use = 40;    /* == 64 - 24 */

          _asm
          {
             mov ebx, diff
             mov edi, row
             mov esi, prev_row
             pxor mm0, mm0
          _asm
          {
             mov ebx, diff
             mov edi, row
             mov esi, prev_row
             pxor mm0, mm0

-            // PRIME the pump (load the first Raw(x-bpp) data set
+            /* PRIME the pump (load the first Raw(x-bpp) data set */

             movq mm1, [edi+ebx-8]
 dpth3lp:
             movq mm1, [edi+ebx-8]
 dpth3lp:

-            psrlq mm1, ShiftRem     // shift last 3 bytes to 1st 3 bytes
-            movq mm2, [esi + ebx]   // load b=Prior(x)
-            punpcklbw mm1, mm0      // Unpack High bytes of a
-            movq mm3, [esi+ebx-8]   // Prep c=Prior(x-bpp) bytes
-            punpcklbw mm2, mm0      // Unpack High bytes of b
-            psrlq mm3, ShiftRem     // shift last 3 bytes to 1st 3 bytes
-            // pav = p - a = (a + b - c) - a = b - c
+            psrlq mm1, ShiftRem     /* shift last 3 bytes to 1st 3 bytes */
+            movq mm2, [esi + ebx]   /* load b=Prior(x) */
+            punpcklbw mm1, mm0      /* Unpack High bytes of a */
+            movq mm3, [esi+ebx-8]   /* Prep c=Prior(x-bpp) bytes */
+            punpcklbw mm2, mm0      /* Unpack High bytes of b */
+            psrlq mm3, ShiftRem     /* shift last 3 bytes to 1st 3 bytes */
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            punpcklbw mm3, mm0      // Unpack High bytes of c
-            // pbv = p - b = (a + b - c) - b = a - c
+            punpcklbw mm3, mm0      /* Unpack High bytes of c */
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7
             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
 
             movq mm6, mm4
             psubw mm5, mm3
 

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4    // Create mask pav bytes < 0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4    /* Create mask pav bytes < 0 */

             paddw mm6, mm5
             paddw mm6, mm5

-            pand mm0, mm4       // Only pav bytes < 0 in mm7
-            pcmpgtw mm7, mm5    // Create mask pbv bytes < 0
+            pand mm0, mm4       /* Only pav bytes < 0 in mm7 */
+            pcmpgtw mm7, mm5    /* Create mask pbv bytes < 0 */

             psubw mm4, mm0
             psubw mm4, mm0

-            pand mm7, mm5       // Only pbv bytes < 0 in mm0
+            pand mm7, mm5       /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6    // Create mask pcv bytes < 0
-            pand mm0, mm6       // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6    /* Create mask pcv bytes < 0 */
+            pand mm0, mm6       /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm7
             psubw mm6, mm0
             psubw mm5, mm7
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5    // pa > pb?
+            pcmpgtw mm7, mm5    /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6       // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6       /* pab > pc? */

             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1
             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1

-            movq mm3, [esi + ebx]   // load c=Prior(x-bpp)
+            movq mm3, [esi + ebx]   /* load c=Prior(x-bpp) */

             pand mm7, ActiveMask
             pand mm7, ActiveMask

-            movq mm2, mm3           // load b=Prior(x) step 1
-            paddb mm7, [edi + ebx]  // add Paeth predictor with Raw(x)
-            punpcklbw mm3, mm0      // Unpack High bytes of c
-            movq [edi + ebx], mm7   // write back updated value
-            movq mm1, mm7           // Now mm1 will be used as Raw(x-bpp)
-            // Now do Paeth for 2nd set of bytes (3-5)
-            psrlq mm2, ShiftBpp     // load b=Prior(x) step 2
-            punpcklbw mm1, mm0      // Unpack High bytes of a
+            movq mm2, mm3           /* load b=Prior(x) step 1 */
+            paddb mm7, [edi + ebx]  /* add Paeth predictor with Raw(x) */
+            punpcklbw mm3, mm0      /* Unpack High bytes of c */
+            movq [edi + ebx], mm7   /* write back updated value */
+            movq mm1, mm7           /* Now mm1 will be used as Raw(x-bpp) */
+            /* Now do Paeth for 2nd set of bytes (3-5) */
+            psrlq mm2, ShiftBpp     /* load b=Prior(x) step 2 */
+            punpcklbw mm1, mm0      /* Unpack High bytes of a */

             pxor mm7, mm7
             pxor mm7, mm7

-            punpcklbw mm2, mm0      // Unpack High bytes of b
-            // pbv = p - b = (a + b - c) - b = a - c
+            punpcklbw mm2, mm0      /* Unpack High bytes of b */
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             movq mm5, mm1

-            // pav = p - a = (a + b - c) - a = b - c
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             psubw mm5, mm3
             psubw mm4, mm3
             movq mm4, mm2
             psubw mm5, mm3
             psubw mm4, mm3

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) =
-            //       pav + pbv = pbv + pav
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = */
+            /*       pav + pbv = pbv + pav */

             movq mm6, mm5
             paddw mm6, mm4
 
             movq mm6, mm5
             paddw mm6, mm4
 

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm5       // Create mask pbv bytes < 0
-            pcmpgtw mm7, mm4       // Create mask pav bytes < 0
-            pand mm0, mm5          // Only pbv bytes < 0 in mm0
-            pand mm7, mm4          // Only pav bytes < 0 in mm7
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm5       /* Create mask pbv bytes < 0 */
+            pcmpgtw mm7, mm4       /* Create mask pav bytes < 0 */
+            pand mm0, mm5          /* Only pbv bytes < 0 in mm0 */
+            pand mm7, mm4          /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm0
             psubw mm4, mm7
             psubw mm5, mm0
             psubw mm4, mm7
             pxor mm0, mm0
             psubw mm5, mm0
             psubw mm4, mm7
             psubw mm5, mm0
             psubw mm4, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6       // Create mask pcv bytes < 0
-            pand mm0, mm6          // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6       /* Create mask pcv bytes < 0 */
+            pand mm0, mm6          /* Only pav bytes < 0 in mm7 */

             psubw mm6, mm0
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5       // pa > pb?
+            pcmpgtw mm7, mm5       /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6       // pab > pc?
-            movq mm2, [esi + ebx]  // load b=Prior(x)
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6       /* pab > pc? */
+            movq mm2, [esi + ebx]  /* load b=Prior(x) */

             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1
             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1

-            movq mm3, mm2           // load c=Prior(x-bpp) step 1
+            movq mm3, mm2           /* load c=Prior(x-bpp) step 1 */

             pand mm7, ActiveMask
             pand mm7, ActiveMask

-            punpckhbw mm2, mm0      // Unpack High bytes of b
-            psllq mm7, ShiftBpp     // Shift bytes to 2nd group of 3 bytes
-             // pav = p - a = (a + b - c) - a = b - c
+            punpckhbw mm2, mm0      /* Unpack High bytes of b */
+            psllq mm7, ShiftBpp     /* Shift bytes to 2nd group of 3 bytes */
+             /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            paddb mm7, [edi + ebx]  // add Paeth predictor with Raw(x)
-            psllq mm3, ShiftBpp     // load c=Prior(x-bpp) step 2
-            movq [edi + ebx], mm7   // write back updated value
+            paddb mm7, [edi + ebx]  /* add Paeth predictor with Raw(x) */
+            psllq mm3, ShiftBpp     /* load c=Prior(x-bpp) step 2 */
+            movq [edi + ebx], mm7   /* write back updated value */

             movq mm1, mm7
             movq mm1, mm7

-            punpckhbw mm3, mm0      // Unpack High bytes of c
-            psllq mm1, ShiftBpp     // Shift bytes
-                                    // Now mm1 will be used as Raw(x-bpp)
-            // Now do Paeth for 3rd, and final, set of bytes (6-7)
+            punpckhbw mm3, mm0      /* Unpack High bytes of c */
+            psllq mm1, ShiftBpp     /* Shift bytes */
+                                    /* Now mm1 will be used as Raw(x-bpp) */
+            /* Now do Paeth for 3rd, and final, set of bytes (6-7) */

             pxor mm7, mm7
             pxor mm7, mm7

-            punpckhbw mm1, mm0      // Unpack High bytes of a
+            punpckhbw mm1, mm0      /* Unpack High bytes of a */

             psubw mm4, mm3
             psubw mm4, mm3

-            // pbv = p - b = (a + b - c) - b = a - c
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             movq mm5, mm1

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
             pxor mm0, mm0
             paddw mm6, mm5
 
             movq mm6, mm4
             psubw mm5, mm3
             pxor mm0, mm0
             paddw mm6, mm5
 

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4    // Create mask pav bytes < 0
-            pcmpgtw mm7, mm5    // Create mask pbv bytes < 0
-            pand mm0, mm4       // Only pav bytes < 0 in mm7
-            pand mm7, mm5       // Only pbv bytes < 0 in mm0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4    /* Create mask pav bytes < 0 */
+            pcmpgtw mm7, mm5    /* Create mask pbv bytes < 0 */
+            pand mm0, mm4       /* Only pav bytes < 0 in mm7 */
+            pand mm7, mm5       /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6    // Create mask pcv bytes < 0
-            pand mm0, mm6       // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6    /* Create mask pcv bytes < 0 */
+            pand mm0, mm6       /* Only pav bytes < 0 in mm7 */

             psubw mm6, mm0
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5    // pa > pb?
+            pcmpgtw mm7, mm5    /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pand mm2, mm0

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pandn mm0, mm1
             pandn mm7, mm4
             paddw mm0, mm2
             paddw mm7, mm5
             pand mm5, mm7
             pandn mm0, mm1
             pandn mm7, mm4
             paddw mm0, mm2
             paddw mm7, mm5

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6    // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6    /* pab > pc? */

             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm1, mm1
             packuswb mm1, mm7
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm1, mm1
             packuswb mm1, mm7

-            // Step ebx to next set of 8 bytes and repeat loop til done
+            /* Step ebx to next set of 8 bytes and repeat loop til done */

             add ebx, 8
             pand mm1, ActiveMaskEnd
             add ebx, 8
             pand mm1, ActiveMaskEnd

-            paddb mm1, [edi + ebx - 8] // add Paeth predictor with Raw(x)
+            paddb mm1, [edi + ebx - 8] /* add Paeth predictor with Raw(x) */

 
             cmp ebx, MMXLength
 
             cmp ebx, MMXLength

-            pxor mm0, mm0              // pxor does not affect flags
-            movq [edi + ebx - 8], mm1  // write back updated value
-                                 // mm1 will be used as Raw(x-bpp) next loop
-                           // mm3 ready to be used as Prior(x-bpp) next loop
+            pxor mm0, mm0              /* pxor does not affect flags */
+            movq [edi + ebx - 8], mm1  /* write back updated value */
+                                 /* mm1 will be used as Raw(x-bpp) next loop */
+                           /* mm3 ready to be used as Prior(x-bpp) next loop */

             jb dpth3lp
             jb dpth3lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       }
       break;
 


@@ -2653,146 +2682,146 @@ dpth3lp:
       {
          ActiveMask.use  = 0x00000000ffffffff;
          ActiveMask2.use = 0xffffffff00000000;
       {
          ActiveMask.use  = 0x00000000ffffffff;
          ActiveMask2.use = 0xffffffff00000000;

-         ShiftBpp.use = bpp << 3;    // == bpp * 8
+         ShiftBpp.use = bpp << 3;    /* == bpp * 8 */

          ShiftRem.use = 64 - ShiftBpp.use;
          _asm
          {
             mov ebx, diff
             mov edi, row
             mov esi, prev_row
          ShiftRem.use = 64 - ShiftBpp.use;
          _asm
          {
             mov ebx, diff
             mov edi, row
             mov esi, prev_row

-            // PRIME the pump (load the first Raw(x-bpp) data set
+            /* PRIME the pump (load the first Raw(x-bpp) data set */

             movq mm1, [edi+ebx-8]
             pxor mm0, mm0
 dpth6lp:
             movq mm1, [edi+ebx-8]
             pxor mm0, mm0
 dpth6lp:

-            // Must shift to position Raw(x-bpp) data
+            /* Must shift to position Raw(x-bpp) data */

             psrlq mm1, ShiftRem
             psrlq mm1, ShiftRem

-            // Do first set of 4 bytes
-            movq mm3, [esi+ebx-8]      // read c=Prior(x-bpp) bytes
-            punpcklbw mm1, mm0      // Unpack Low bytes of a
-            movq mm2, [esi + ebx]   // load b=Prior(x)
-            punpcklbw mm2, mm0      // Unpack Low bytes of b
-            // Must shift to position Prior(x-bpp) data
+            /* Do first set of 4 bytes */
+            movq mm3, [esi+ebx-8]      /* read c=Prior(x-bpp) bytes */
+            punpcklbw mm1, mm0      /* Unpack Low bytes of a */
+            movq mm2, [esi + ebx]   /* load b=Prior(x) */
+            punpcklbw mm2, mm0      /* Unpack Low bytes of b */
+            /* Must shift to position Prior(x-bpp) data */

             psrlq mm3, ShiftRem
             psrlq mm3, ShiftRem

-            // pav = p - a = (a + b - c) - a = b - c
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            punpcklbw mm3, mm0      // Unpack Low bytes of c
-            // pbv = p - b = (a + b - c) - b = a - c
+            punpcklbw mm3, mm0      /* Unpack Low bytes of c */
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7
             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
             movq mm6, mm4
             psubw mm5, mm3

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4    // Create mask pav bytes < 0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4    /* Create mask pav bytes < 0 */

             paddw mm6, mm5
             paddw mm6, mm5

-            pand mm0, mm4       // Only pav bytes < 0 in mm7
-            pcmpgtw mm7, mm5    // Create mask pbv bytes < 0
+            pand mm0, mm4       /* Only pav bytes < 0 in mm7 */
+            pcmpgtw mm7, mm5    /* Create mask pbv bytes < 0 */

             psubw mm4, mm0
             psubw mm4, mm0

-            pand mm7, mm5       // Only pbv bytes < 0 in mm0
+            pand mm7, mm5       /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6    // Create mask pcv bytes < 0
-            pand mm0, mm6       // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6    /* Create mask pcv bytes < 0 */
+            pand mm0, mm6       /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm7
             psubw mm6, mm0
             psubw mm5, mm7
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5    // pa > pb?
+            pcmpgtw mm7, mm5    /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6    // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6    /* pab > pc? */

             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1
             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1

-            movq mm3, [esi + ebx - 8]  // load c=Prior(x-bpp)
+            movq mm3, [esi + ebx - 8]  /* load c=Prior(x-bpp) */

             pand mm7, ActiveMask
             psrlq mm3, ShiftRem
             pand mm7, ActiveMask
             psrlq mm3, ShiftRem

-            movq mm2, [esi + ebx]      // load b=Prior(x) step 1
-            paddb mm7, [edi + ebx]     // add Paeth predictor with Raw(x)
+            movq mm2, [esi + ebx]      /* load b=Prior(x) step 1 */
+            paddb mm7, [edi + ebx]     /* add Paeth predictor with Raw(x) */

             movq mm6, mm2
             movq mm6, mm2

-            movq [edi + ebx], mm7      // write back updated value
+            movq [edi + ebx], mm7      /* write back updated value */

             movq mm1, [edi+ebx-8]
             psllq mm6, ShiftBpp
             movq mm5, mm7
             psrlq mm1, ShiftRem
             por mm3, mm6
             psllq mm5, ShiftBpp
             movq mm1, [edi+ebx-8]
             psllq mm6, ShiftBpp
             movq mm5, mm7
             psrlq mm1, ShiftRem
             por mm3, mm6
             psllq mm5, ShiftBpp

-            punpckhbw mm3, mm0         // Unpack High bytes of c
+            punpckhbw mm3, mm0         /* Unpack High bytes of c */

             por mm1, mm5
             por mm1, mm5

-            // Do second set of 4 bytes
-            punpckhbw mm2, mm0         // Unpack High bytes of b
-            punpckhbw mm1, mm0         // Unpack High bytes of a
-            // pav = p - a = (a + b - c) - a = b - c
+            /* Do second set of 4 bytes */
+            punpckhbw mm2, mm0         /* Unpack High bytes of b */
+            punpckhbw mm1, mm0         /* Unpack High bytes of a */
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            // pbv = p - b = (a + b - c) - b = a - c
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7
             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
             movq mm6, mm4
             psubw mm5, mm3

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4       // Create mask pav bytes < 0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4       /* Create mask pav bytes < 0 */

             paddw mm6, mm5
             paddw mm6, mm5

-            pand mm0, mm4          // Only pav bytes < 0 in mm7
-            pcmpgtw mm7, mm5       // Create mask pbv bytes < 0
+            pand mm0, mm4          /* Only pav bytes < 0 in mm7 */
+            pcmpgtw mm7, mm5       /* Create mask pbv bytes < 0 */

             psubw mm4, mm0
             psubw mm4, mm0

-            pand mm7, mm5          // Only pbv bytes < 0 in mm0
+            pand mm7, mm5          /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6       // Create mask pcv bytes < 0
-            pand mm0, mm6          // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6       /* Create mask pcv bytes < 0 */
+            pand mm0, mm6          /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm7
             psubw mm6, mm0
             psubw mm5, mm7
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5       // pa > pb?
+            pcmpgtw mm7, mm5       /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6           // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6           /* pab > pc? */

             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0
             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0

-            // Step ex to next set of 8 bytes and repeat loop til done
+            /* Step ex to next set of 8 bytes and repeat loop til done */

             add ebx, 8
             packuswb mm1, mm7
             add ebx, 8
             packuswb mm1, mm7

-            paddb mm1, [edi + ebx - 8]     // add Paeth predictor with Raw(x)
+            paddb mm1, [edi + ebx - 8]     /* add Paeth predictor with Raw(x) */

             cmp ebx, MMXLength
             cmp ebx, MMXLength

-            movq [edi + ebx - 8], mm1      // write back updated value
-                                // mm1 will be used as Raw(x-bpp) next loop
+            movq [edi + ebx - 8], mm1      /* write back updated value */
+                                /* mm1 will be used as Raw(x-bpp) next loop */

             jb dpth6lp
             jb dpth6lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       }
       break;
 


@@ -2804,130 +2833,130 @@ dpth6lp:
             mov edi, row
             mov esi, prev_row
             pxor mm0, mm0
             mov edi, row
             mov esi, prev_row
             pxor mm0, mm0

-            // PRIME the pump (load the first Raw(x-bpp) data set
-            movq mm1, [edi+ebx-8]    // Only time should need to read
-                                     //  a=Raw(x-bpp) bytes
+            /* PRIME the pump (load the first Raw(x-bpp) data set */
+            movq mm1, [edi+ebx-8]    /* Only time should need to read */
+                                     /*  a=Raw(x-bpp) bytes */

 dpth4lp:
 dpth4lp:

-            // Do first set of 4 bytes
-            movq mm3, [esi+ebx-8]    // read c=Prior(x-bpp) bytes
-            punpckhbw mm1, mm0       // Unpack Low bytes of a
-            movq mm2, [esi + ebx]    // load b=Prior(x)
-            punpcklbw mm2, mm0       // Unpack High bytes of b
-            // pav = p - a = (a + b - c) - a = b - c
+            /* Do first set of 4 bytes */
+            movq mm3, [esi+ebx-8]    /* read c=Prior(x-bpp) bytes */
+            punpckhbw mm1, mm0       /* Unpack Low bytes of a */
+            movq mm2, [esi + ebx]    /* load b=Prior(x) */
+            punpcklbw mm2, mm0       /* Unpack High bytes of b */
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            punpckhbw mm3, mm0       // Unpack High bytes of c
-            // pbv = p - b = (a + b - c) - b = a - c
+            punpckhbw mm3, mm0       /* Unpack High bytes of c */
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7
             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
             movq mm6, mm4
             psubw mm5, mm3

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4       // Create mask pav bytes < 0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4       /* Create mask pav bytes < 0 */

             paddw mm6, mm5
             paddw mm6, mm5

-            pand mm0, mm4          // Only pav bytes < 0 in mm7
-            pcmpgtw mm7, mm5       // Create mask pbv bytes < 0
+            pand mm0, mm4          /* Only pav bytes < 0 in mm7 */
+            pcmpgtw mm7, mm5       /* Create mask pbv bytes < 0 */

             psubw mm4, mm0
             psubw mm4, mm0

-            pand mm7, mm5          // Only pbv bytes < 0 in mm0
+            pand mm7, mm5          /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6       // Create mask pcv bytes < 0
-            pand mm0, mm6          // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6       /* Create mask pcv bytes < 0 */
+            pand mm0, mm6          /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm7
             psubw mm6, mm0
             psubw mm5, mm7
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5       // pa > pb?
+            pcmpgtw mm7, mm5       /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6       // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6       /* pab > pc? */

             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1
             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1

-            movq mm3, [esi + ebx]      // load c=Prior(x-bpp)
+            movq mm3, [esi + ebx]      /* load c=Prior(x-bpp) */

             pand mm7, ActiveMask
             pand mm7, ActiveMask

-            movq mm2, mm3              // load b=Prior(x) step 1
-            paddb mm7, [edi + ebx]     // add Paeth predictor with Raw(x)
-            punpcklbw mm3, mm0         // Unpack High bytes of c
-            movq [edi + ebx], mm7      // write back updated value
-            movq mm1, mm7              // Now mm1 will be used as Raw(x-bpp)
-            // Do second set of 4 bytes
-            punpckhbw mm2, mm0         // Unpack Low bytes of b
-            punpcklbw mm1, mm0         // Unpack Low bytes of a
-            // pav = p - a = (a + b - c) - a = b - c
+            movq mm2, mm3              /* load b=Prior(x) step 1 */
+            paddb mm7, [edi + ebx]     /* add Paeth predictor with Raw(x) */
+            punpcklbw mm3, mm0         /* Unpack High bytes of c */
+            movq [edi + ebx], mm7      /* write back updated value */
+            movq mm1, mm7              /* Now mm1 will be used as Raw(x-bpp) */
+            /* Do second set of 4 bytes */
+            punpckhbw mm2, mm0         /* Unpack Low bytes of b */
+            punpcklbw mm1, mm0         /* Unpack Low bytes of a */
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            // pbv = p - b = (a + b - c) - b = a - c
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7
             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
             movq mm6, mm4
             psubw mm5, mm3

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4       // Create mask pav bytes < 0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4       /* Create mask pav bytes < 0 */

             paddw mm6, mm5
             paddw mm6, mm5

-            pand mm0, mm4          // Only pav bytes < 0 in mm7
-            pcmpgtw mm7, mm5       // Create mask pbv bytes < 0
+            pand mm0, mm4          /* Only pav bytes < 0 in mm7 */
+            pcmpgtw mm7, mm5       /* Create mask pbv bytes < 0 */

             psubw mm4, mm0
             psubw mm4, mm0

-            pand mm7, mm5          // Only pbv bytes < 0 in mm0
+            pand mm7, mm5          /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6       // Create mask pcv bytes < 0
-            pand mm0, mm6          // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6       /* Create mask pcv bytes < 0 */
+            pand mm0, mm6          /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm7
             psubw mm6, mm0
             psubw mm5, mm7
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5       // pa > pb?
+            pcmpgtw mm7, mm5       /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6       // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6       /* pab > pc? */

             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0
             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0

-            // Step ex to next set of 8 bytes and repeat loop til done
+            /* Step ex to next set of 8 bytes and repeat loop til done */

             add ebx, 8
             packuswb mm1, mm7
             add ebx, 8
             packuswb mm1, mm7

-            paddb mm1, [edi + ebx - 8]     // add Paeth predictor with Raw(x)
+            paddb mm1, [edi + ebx - 8]     /* add Paeth predictor with Raw(x) */

             cmp ebx, MMXLength
             cmp ebx, MMXLength

-            movq [edi + ebx - 8], mm1      // write back updated value
-                                // mm1 will be used as Raw(x-bpp) next loop
+            movq [edi + ebx - 8], mm1      /* write back updated value */
+                                /* mm1 will be used as Raw(x-bpp) next loop */

             jb dpth4lp
             jb dpth4lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
       }
       break;

-      case 8:                          // bpp == 8
+      case 8:                          /* bpp == 8 */

       {
          ActiveMask.use  = 0x00000000ffffffff;
          _asm {
       {
          ActiveMask.use  = 0x00000000ffffffff;
          _asm {


@@ -2935,134 +2964,134 @@ dpth4lp:
             mov edi, row
             mov esi, prev_row
             pxor mm0, mm0
             mov edi, row
             mov esi, prev_row
             pxor mm0, mm0

-            // PRIME the pump (load the first Raw(x-bpp) data set
-            movq mm1, [edi+ebx-8]      // Only time should need to read
-                                       //  a=Raw(x-bpp) bytes
+            /* PRIME the pump (load the first Raw(x-bpp) data set */
+            movq mm1, [edi+ebx-8]      /* Only time should need to read */
+                                       /*  a=Raw(x-bpp) bytes */

 dpth8lp:
 dpth8lp:

-            // Do first set of 4 bytes
-            movq mm3, [esi+ebx-8]      // read c=Prior(x-bpp) bytes
-            punpcklbw mm1, mm0         // Unpack Low bytes of a
-            movq mm2, [esi + ebx]      // load b=Prior(x)
-            punpcklbw mm2, mm0         // Unpack Low bytes of b
-            // pav = p - a = (a + b - c) - a = b - c
+            /* Do first set of 4 bytes */
+            movq mm3, [esi+ebx-8]      /* read c=Prior(x-bpp) bytes */
+            punpcklbw mm1, mm0         /* Unpack Low bytes of a */
+            movq mm2, [esi + ebx]      /* load b=Prior(x) */
+            punpcklbw mm2, mm0         /* Unpack Low bytes of b */
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            punpcklbw mm3, mm0         // Unpack Low bytes of c
-            // pbv = p - b = (a + b - c) - b = a - c
+            punpcklbw mm3, mm0         /* Unpack Low bytes of c */
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7
             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
             movq mm6, mm4
             psubw mm5, mm3

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4       // Create mask pav bytes < 0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4       /* Create mask pav bytes < 0 */

             paddw mm6, mm5
             paddw mm6, mm5

-            pand mm0, mm4          // Only pav bytes < 0 in mm7
-            pcmpgtw mm7, mm5       // Create mask pbv bytes < 0
+            pand mm0, mm4          /* Only pav bytes < 0 in mm7 */
+            pcmpgtw mm7, mm5       /* Create mask pbv bytes < 0 */

             psubw mm4, mm0
             psubw mm4, mm0

-            pand mm7, mm5          // Only pbv bytes < 0 in mm0
+            pand mm7, mm5          /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6       // Create mask pcv bytes < 0
-            pand mm0, mm6          // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6       /* Create mask pcv bytes < 0 */
+            pand mm0, mm6          /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm7
             psubw mm6, mm0
             psubw mm5, mm7
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5       // pa > pb?
+            pcmpgtw mm7, mm5       /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6       // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6       /* pab > pc? */

             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1
             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             paddw mm7, mm3
             pxor mm0, mm0
             packuswb mm7, mm1

-            movq mm3, [esi+ebx-8]    // read c=Prior(x-bpp) bytes
+            movq mm3, [esi+ebx-8]    /* read c=Prior(x-bpp) bytes */

             pand mm7, ActiveMask
             pand mm7, ActiveMask

-            movq mm2, [esi + ebx]    // load b=Prior(x)
-            paddb mm7, [edi + ebx]   // add Paeth predictor with Raw(x)
-            punpckhbw mm3, mm0       // Unpack High bytes of c
-            movq [edi + ebx], mm7    // write back updated value
-            movq mm1, [edi+ebx-8]    // read a=Raw(x-bpp) bytes
-
-            // Do second set of 4 bytes
-            punpckhbw mm2, mm0       // Unpack High bytes of b
-            punpckhbw mm1, mm0       // Unpack High bytes of a
-            // pav = p - a = (a + b - c) - a = b - c
+            movq mm2, [esi + ebx]    /* load b=Prior(x) */
+            paddb mm7, [edi + ebx]   /* add Paeth predictor with Raw(x) */
+            punpckhbw mm3, mm0       /* Unpack High bytes of c */
+            movq [edi + ebx], mm7    /* write back updated value */
+            movq mm1, [edi+ebx-8]    /* read a=Raw(x-bpp) bytes */
+
+            /* Do second set of 4 bytes */
+            punpckhbw mm2, mm0       /* Unpack High bytes of b */
+            punpckhbw mm1, mm0       /* Unpack High bytes of a */
+            /* pav = p - a = (a + b - c) - a = b - c */

             movq mm4, mm2
             movq mm4, mm2

-            // pbv = p - b = (a + b - c) - b = a - c
+            /* pbv = p - b = (a + b - c) - b = a - c */

             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7
             movq mm5, mm1
             psubw mm4, mm3
             pxor mm7, mm7

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */

             movq mm6, mm4
             psubw mm5, mm3
             movq mm6, mm4
             psubw mm5, mm3

-            // pa = abs(p-a) = abs(pav)
-            // pb = abs(p-b) = abs(pbv)
-            // pc = abs(p-c) = abs(pcv)
-            pcmpgtw mm0, mm4       // Create mask pav bytes < 0
+            /* pa = abs(p-a) = abs(pav) */
+            /* pb = abs(p-b) = abs(pbv) */
+            /* pc = abs(p-c) = abs(pcv) */
+            pcmpgtw mm0, mm4       /* Create mask pav bytes < 0 */

             paddw mm6, mm5
             paddw mm6, mm5

-            pand mm0, mm4          // Only pav bytes < 0 in mm7
-            pcmpgtw mm7, mm5       // Create mask pbv bytes < 0
+            pand mm0, mm4          /* Only pav bytes < 0 in mm7 */
+            pcmpgtw mm7, mm5       /* Create mask pbv bytes < 0 */

             psubw mm4, mm0
             psubw mm4, mm0

-            pand mm7, mm5          // Only pbv bytes < 0 in mm0
+            pand mm7, mm5          /* Only pbv bytes < 0 in mm0 */

             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0
             psubw mm4, mm0
             psubw mm5, mm7
             pxor mm0, mm0

-            pcmpgtw mm0, mm6       // Create mask pcv bytes < 0
-            pand mm0, mm6          // Only pav bytes < 0 in mm7
+            pcmpgtw mm0, mm6       /* Create mask pcv bytes < 0 */
+            pand mm0, mm6          /* Only pav bytes < 0 in mm7 */

             psubw mm5, mm7
             psubw mm6, mm0
             psubw mm5, mm7
             psubw mm6, mm0

-            //  test pa <= pb
+            /*  test pa <= pb */

             movq mm7, mm4
             psubw mm6, mm0
             movq mm7, mm4
             psubw mm6, mm0

-            pcmpgtw mm7, mm5       // pa > pb?
+            pcmpgtw mm7, mm5       /* pa > pb? */

             movq mm0, mm7
             movq mm0, mm7

-            // use mm7 mask to merge pa & pb
+            /* use mm7 mask to merge pa & pb */

             pand mm5, mm7
             pand mm5, mm7

-            // use mm0 mask copy to merge a & b
+            /* use mm0 mask copy to merge a & b */

             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2
             pand mm2, mm0
             pandn mm7, mm4
             pandn mm0, mm1
             paddw mm7, mm5
             paddw mm0, mm2

-            //  test  ((pa <= pb)? pa:pb) <= pc
-            pcmpgtw mm7, mm6       // pab > pc?
+            /*  test  ((pa <= pb)? pa:pb) <= pc */
+            pcmpgtw mm7, mm6       /* pab > pc? */

             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0
             pxor mm1, mm1
             pand mm3, mm7
             pandn mm7, mm0
             pxor mm1, mm1
             paddw mm7, mm3
             pxor mm0, mm0

-            // Step ex to next set of 8 bytes and repeat loop til done
+            /* Step ex to next set of 8 bytes and repeat loop til done */

             add ebx, 8
             packuswb mm1, mm7
             add ebx, 8
             packuswb mm1, mm7

-            paddb mm1, [edi + ebx - 8]     // add Paeth predictor with Raw(x)
+            paddb mm1, [edi + ebx - 8]     /* add Paeth predictor with Raw(x) */

             cmp ebx, MMXLength
             cmp ebx, MMXLength

-            movq [edi + ebx - 8], mm1      // write back updated value
-                            // mm1 will be used as Raw(x-bpp) next loop
+            movq [edi + ebx - 8], mm1      /* write back updated value */
+                            /* mm1 will be used as Raw(x-bpp) next loop */

             jb dpth8lp
             jb dpth8lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       }
       break;
 

-      case 1:                // bpp = 1
-      case 2:                // bpp = 2
-      default:               // bpp > 8
+      case 1:                /* bpp = 1 */
+      case 2:                /* bpp = 2 */
+      default:               /* bpp > 8 */

       {
          _asm {
             mov ebx, diff
       {
          _asm {
             mov ebx, diff


@@ -3070,186 +3099,186 @@ dpth8lp:
             jnb dpthdend
             mov edi, row
             mov esi, prev_row
             jnb dpthdend
             mov edi, row
             mov esi, prev_row

-            // Do Paeth decode for remaining bytes
+            /* Do Paeth decode for remaining bytes */

             mov edx, ebx
             mov edx, ebx

-            xor ecx, ecx        // zero ecx before using cl & cx in loop below
-            sub edx, bpp        // Set edx = ebx - bpp
+            xor ecx, ecx        /* zero ecx before using cl & cx in loop below */
+            sub edx, bpp        /* Set edx = ebx - bpp */

 dpthdlp:
             xor eax, eax
 dpthdlp:
             xor eax, eax

-            // pav = p - a = (a + b - c) - a = b - c
-            mov al, [esi + ebx]        // load Prior(x) into al
-            mov cl, [esi + edx]        // load Prior(x-bpp) into cl
-            sub eax, ecx                 // subtract Prior(x-bpp)
-            mov patemp, eax                 // Save pav for later use
+            /* pav = p - a = (a + b - c) - a = b - c */
+            mov al, [esi + ebx]        /* load Prior(x) into al */
+            mov cl, [esi + edx]        /* load Prior(x-bpp) into cl */
+            sub eax, ecx                 /* subtract Prior(x-bpp) */
+            mov patemp, eax                 /* Save pav for later use */

             xor eax, eax
             xor eax, eax

-            // pbv = p - b = (a + b - c) - b = a - c
-            mov al, [edi + edx]        // load Raw(x-bpp) into al
-            sub eax, ecx                 // subtract Prior(x-bpp)
+            /* pbv = p - b = (a + b - c) - b = a - c */
+            mov al, [edi + edx]        /* load Raw(x-bpp) into al */
+            sub eax, ecx                 /* subtract Prior(x-bpp) */

             mov ecx, eax
             mov ecx, eax

-            // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
-            add eax, patemp                 // pcv = pav + pbv
-            // pc = abs(pcv)
+            /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */
+            add eax, patemp                 /* pcv = pav + pbv */
+            /* pc = abs(pcv) */

             test eax, 0x80000000
             jz dpthdpca
             test eax, 0x80000000
             jz dpthdpca

-            neg eax                     // reverse sign of neg values
+            neg eax                     /* reverse sign of neg values */

 dpthdpca:
 dpthdpca:

-            mov pctemp, eax             // save pc for later use
-            // pb = abs(pbv)
+            mov pctemp, eax             /* save pc for later use */
+            /* pb = abs(pbv) */

             test ecx, 0x80000000
             jz dpthdpba
             test ecx, 0x80000000
             jz dpthdpba

-            neg ecx                     // reverse sign of neg values
+            neg ecx                     /* reverse sign of neg values */

 dpthdpba:
 dpthdpba:

-            mov pbtemp, ecx             // save pb for later use
-            // pa = abs(pav)
+            mov pbtemp, ecx             /* save pb for later use */
+            /* pa = abs(pav) */

             mov eax, patemp
             test eax, 0x80000000
             jz dpthdpaa
             mov eax, patemp
             test eax, 0x80000000
             jz dpthdpaa

-            neg eax                     // reverse sign of neg values
+            neg eax                     /* reverse sign of neg values */

 dpthdpaa:
 dpthdpaa:

-            mov patemp, eax             // save pa for later use
-            // test if pa <= pb
+            mov patemp, eax             /* save pa for later use */
+            /* test if pa <= pb */

             cmp eax, ecx
             jna dpthdabb
             cmp eax, ecx
             jna dpthdabb

-            // pa > pb; now test if pb <= pc
+            /* pa > pb; now test if pb <= pc */

             cmp ecx, pctemp
             jna dpthdbbc
             cmp ecx, pctemp
             jna dpthdbbc

-            // pb > pc; Raw(x) = Paeth(x) + Prior(x-bpp)
-            mov cl, [esi + edx]  // load Prior(x-bpp) into cl
+            /* pb > pc; Raw(x) = Paeth(x) + Prior(x-bpp) */
+            mov cl, [esi + edx]  /* load Prior(x-bpp) into cl */

             jmp dpthdpaeth
 dpthdbbc:
             jmp dpthdpaeth
 dpthdbbc:

-            // pb <= pc; Raw(x) = Paeth(x) + Prior(x)
-            mov cl, [esi + ebx]        // load Prior(x) into cl
+            /* pb <= pc; Raw(x) = Paeth(x) + Prior(x) */
+            mov cl, [esi + ebx]        /* load Prior(x) into cl */

             jmp dpthdpaeth
 dpthdabb:
             jmp dpthdpaeth
 dpthdabb:

-            // pa <= pb; now test if pa <= pc
+            /* pa <= pb; now test if pa <= pc */

             cmp eax, pctemp
             jna dpthdabc
             cmp eax, pctemp
             jna dpthdabc

-            // pa > pc; Raw(x) = Paeth(x) + Prior(x-bpp)
-            mov cl, [esi + edx]  // load Prior(x-bpp) into cl
+            /* pa > pc; Raw(x) = Paeth(x) + Prior(x-bpp) */
+            mov cl, [esi + edx]  /* load Prior(x-bpp) into cl */

             jmp dpthdpaeth
 dpthdabc:
             jmp dpthdpaeth
 dpthdabc:

-            // pa <= pc; Raw(x) = Paeth(x) + Raw(x-bpp)
-            mov cl, [edi + edx]  // load Raw(x-bpp) into cl
+            /* pa <= pc; Raw(x) = Paeth(x) + Raw(x-bpp) */
+            mov cl, [edi + edx]  /* load Raw(x-bpp) into cl */

 dpthdpaeth:
             inc ebx
             inc edx
 dpthdpaeth:
             inc ebx
             inc edx

-            // Raw(x) = (Paeth(x) + Paeth_Predictor( a, b, c )) mod 256
+            /* Raw(x) = (Paeth(x) + Paeth_Predictor( a, b, c )) mod 256 */

             add [edi + ebx - 1], cl
             cmp ebx, FullLength
             jb dpthdlp
 dpthdend:
             add [edi + ebx - 1], cl
             cmp ebx, FullLength
             jb dpthdlp
 dpthdend:

-         } // end _asm block
+         } /* end _asm block */

       }
       }

-      return;                   // No need to go further with this one
-   }                         // end switch ( bpp )
+      return;                   /* No need to go further with this one */
+   }                         /* end switch ( bpp ) */

    _asm
    {
    _asm
    {

-         // MMX acceleration complete now do clean-up
-         // Check if any remaining bytes left to decode
+         /* MMX acceleration complete now do clean-up */
+         /* Check if any remaining bytes left to decode */

          mov ebx, MMXLength
          cmp ebx, FullLength
          jnb dpthend
          mov edi, row
          mov esi, prev_row
          mov ebx, MMXLength
          cmp ebx, FullLength
          jnb dpthend
          mov edi, row
          mov esi, prev_row

-         // Do Paeth decode for remaining bytes
+         /* Do Paeth decode for remaining bytes */

          mov edx, ebx
          mov edx, ebx

-         xor ecx, ecx         // zero ecx before using cl & cx in loop below
-         sub edx, bpp         // Set edx = ebx - bpp
+         xor ecx, ecx         /* zero ecx before using cl & cx in loop below */
+         sub edx, bpp         /* Set edx = ebx - bpp */

 dpthlp2:
          xor eax, eax
 dpthlp2:
          xor eax, eax

-         // pav = p - a = (a + b - c) - a = b - c
-         mov al, [esi + ebx]  // load Prior(x) into al
-         mov cl, [esi + edx]  // load Prior(x-bpp) into cl
-         sub eax, ecx         // subtract Prior(x-bpp)
-         mov patemp, eax      // Save pav for later use
+         /* pav = p - a = (a + b - c) - a = b - c */
+         mov al, [esi + ebx]  /* load Prior(x) into al */
+         mov cl, [esi + edx]  /* load Prior(x-bpp) into cl */
+         sub eax, ecx         /* subtract Prior(x-bpp) */
+         mov patemp, eax      /* Save pav for later use */

          xor eax, eax
          xor eax, eax

-         // pbv = p - b = (a + b - c) - b = a - c
-         mov al, [edi + edx]  // load Raw(x-bpp) into al
-         sub eax, ecx         // subtract Prior(x-bpp)
+         /* pbv = p - b = (a + b - c) - b = a - c */
+         mov al, [edi + edx]  /* load Raw(x-bpp) into al */
+         sub eax, ecx         /* subtract Prior(x-bpp) */

          mov ecx, eax
          mov ecx, eax

-         // pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv
-         add eax, patemp      // pcv = pav + pbv
-         // pc = abs(pcv)
+         /* pcv = p - c = (a + b - c) -c = (a - c) + (b - c) = pav + pbv */
+         add eax, patemp      /* pcv = pav + pbv */
+         /* pc = abs(pcv) */

          test eax, 0x80000000
          jz dpthpca2
          test eax, 0x80000000
          jz dpthpca2

-         neg eax              // reverse sign of neg values
+         neg eax              /* reverse sign of neg values */

 dpthpca2:
 dpthpca2:

-         mov pctemp, eax      // save pc for later use
-         // pb = abs(pbv)
+         mov pctemp, eax      /* save pc for later use */
+         /* pb = abs(pbv) */

          test ecx, 0x80000000
          jz dpthpba2
          test ecx, 0x80000000
          jz dpthpba2

-         neg ecx              // reverse sign of neg values
+         neg ecx              /* reverse sign of neg values */

 dpthpba2:
 dpthpba2:

-         mov pbtemp, ecx      // save pb for later use
-         // pa = abs(pav)
+         mov pbtemp, ecx      /* save pb for later use */
+         /* pa = abs(pav) */

          mov eax, patemp
          test eax, 0x80000000
          jz dpthpaa2
          mov eax, patemp
          test eax, 0x80000000
          jz dpthpaa2

-         neg eax              // reverse sign of neg values
+         neg eax              /* reverse sign of neg values */

 dpthpaa2:
 dpthpaa2:

-         mov patemp, eax      // save pa for later use
-         // test if pa <= pb
+         mov patemp, eax      /* save pa for later use */
+         /* test if pa <= pb */

          cmp eax, ecx
          jna dpthabb2
          cmp eax, ecx
          jna dpthabb2

-         // pa > pb; now test if pb <= pc
+         /* pa > pb; now test if pb <= pc */

          cmp ecx, pctemp
          jna dpthbbc2
          cmp ecx, pctemp
          jna dpthbbc2

-         // pb > pc; Raw(x) = Paeth(x) + Prior(x-bpp)
-         mov cl, [esi + edx]  // load Prior(x-bpp) into cl
+         /* pb > pc; Raw(x) = Paeth(x) + Prior(x-bpp) */
+         mov cl, [esi + edx]  /* load Prior(x-bpp) into cl */

          jmp dpthpaeth2
 dpthbbc2:
          jmp dpthpaeth2
 dpthbbc2:

-         // pb <= pc; Raw(x) = Paeth(x) + Prior(x)
-         mov cl, [esi + ebx]        // load Prior(x) into cl
+         /* pb <= pc; Raw(x) = Paeth(x) + Prior(x) */
+         mov cl, [esi + ebx]        /* load Prior(x) into cl */

          jmp dpthpaeth2
 dpthabb2:
          jmp dpthpaeth2
 dpthabb2:

-         // pa <= pb; now test if pa <= pc
+         /* pa <= pb; now test if pa <= pc */

          cmp eax, pctemp
          jna dpthabc2
          cmp eax, pctemp
          jna dpthabc2

-         // pa > pc; Raw(x) = Paeth(x) + Prior(x-bpp)
-         mov cl, [esi + edx]  // load Prior(x-bpp) into cl
+         /* pa > pc; Raw(x) = Paeth(x) + Prior(x-bpp) */
+         mov cl, [esi + edx]  /* load Prior(x-bpp) into cl */

          jmp dpthpaeth2
 dpthabc2:
          jmp dpthpaeth2
 dpthabc2:

-         // pa <= pc; Raw(x) = Paeth(x) + Raw(x-bpp)
-         mov cl, [edi + edx]  // load Raw(x-bpp) into cl
+         /* pa <= pc; Raw(x) = Paeth(x) + Raw(x-bpp) */
+         mov cl, [edi + edx]  /* load Raw(x-bpp) into cl */

 dpthpaeth2:
          inc ebx
          inc edx
 dpthpaeth2:
          inc ebx
          inc edx

-         // Raw(x) = (Paeth(x) + Paeth_Predictor( a, b, c )) mod 256
+         /* Raw(x) = (Paeth(x) + Paeth_Predictor( a, b, c )) mod 256 */

          add [edi + ebx - 1], cl
          cmp ebx, FullLength
          jb dpthlp2
 dpthend:
          add [edi + ebx - 1], cl
          cmp ebx, FullLength
          jb dpthlp2
 dpthend:

-         emms             // End MMX instructions; prep for possible FP instrs.
-   } // end _asm block
+         emms             /* End MMX instructions; prep for possible FP instrs. */
+   } /* end _asm block */

 }
 
 }
 

-// Optimized code for PNG Sub filter decoder
+/* Optimized code for PNG Sub filter decoder */

 void /* PRIVATE */
 png_read_filter_row_mmx_sub(png_row_infop row_info, png_bytep row)
 {
 void /* PRIVATE */
 png_read_filter_row_mmx_sub(png_row_infop row_info, png_bytep row)
 {

-   //int test;
+   /*int test; */

    int bpp;
    png_uint_32 FullLength;
    png_uint_32 MMXLength;
    int diff;
 
    int bpp;
    png_uint_32 FullLength;
    png_uint_32 MMXLength;
    int diff;
 

-   bpp = (row_info->pixel_depth + 7) >> 3; // Get # bytes per pixel
-   FullLength  = row_info->rowbytes - bpp; // # of bytes to filter
+   bpp = (row_info->pixel_depth + 7) >> 3; /* Get # bytes per pixel */
+   FullLength  = row_info->rowbytes - bpp; /* # of bytes to filter */

    _asm {
         mov edi, row
    _asm {
         mov edi, row

-        mov esi, edi               // lp = row
-        add edi, bpp               // rp = row + bpp
+        mov esi, edi               /* lp = row */
+        add edi, bpp               /* rp = row + bpp */

         xor eax, eax
         xor eax, eax

-        // get # of bytes to alignment
-        mov diff, edi               // take start of row
-        add diff, 0xf               // add 7 + 8 to incr past
-                                        // alignment boundary
+        /* get # of bytes to alignment */
+        mov diff, edi               /* take start of row */
+        add diff, 0xf               /* add 7 + 8 to incr past */
+                                        /* alignment boundary */

         xor ebx, ebx
         xor ebx, ebx

-        and diff, 0xfffffff8        // mask to alignment boundary
-        sub diff, edi               // subtract from start ==> value
-                                        //  ebx at alignment
+        and diff, 0xfffffff8        /* mask to alignment boundary */
+        sub diff, edi               /* subtract from start ==> value */
+                                        /*  ebx at alignment */

         jz dsubgo
         jz dsubgo

-        // fix alignment
+        /* fix alignment */

 dsublp1:
         mov al, [esi+ebx]
         add [edi+ebx], al
 dsublp1:
         mov al, [esi+ebx]
         add [edi+ebx], al


@@ -3259,79 +3288,79 @@ dsublp1:
 dsubgo:
         mov ecx, FullLength
         mov edx, ecx
 dsubgo:
         mov ecx, FullLength
         mov edx, ecx

-        sub edx, ebx                  // subtract alignment fix
-        and edx, 0x00000007           // calc bytes over mult of 8
-        sub ecx, edx                  // drop over bytes from length
+        sub edx, ebx                  /* subtract alignment fix */
+        and edx, 0x00000007           /* calc bytes over mult of 8 */
+        sub ecx, edx                  /* drop over bytes from length */

         mov MMXLength, ecx
         mov MMXLength, ecx

-   } // end _asm block
+   } /* end _asm block */

 
 

-   // Now do the math for the rest of the row
+   /* Now do the math for the rest of the row */

    switch ( bpp )
    {
         case 3:
         {
          ActiveMask.use  = 0x0000ffffff000000;
    switch ( bpp )
    {
         case 3:
         {
          ActiveMask.use  = 0x0000ffffff000000;

-         ShiftBpp.use = 24;       // == 3 * 8
-         ShiftRem.use  = 40;      // == 64 - 24
+         ShiftBpp.use = 24;       /* == 3 * 8 */
+         ShiftRem.use  = 40;      /* == 64 - 24 */

          _asm {
             mov edi, row
          _asm {
             mov edi, row

-            movq mm7, ActiveMask  // Load ActiveMask for 2nd active byte group
-            mov esi, edi              // lp = row
-            add edi, bpp          // rp = row + bpp
+            movq mm7, ActiveMask  /* Load ActiveMask for 2nd active byte group */
+            mov esi, edi              /* lp = row */
+            add edi, bpp          /* rp = row + bpp */

             movq mm6, mm7
             mov ebx, diff
             movq mm6, mm7
             mov ebx, diff

-            psllq mm6, ShiftBpp   // Move mask in mm6 to cover 3rd active
-                                  // byte group
-            // PRIME the pump (load the first Raw(x-bpp) data set
+            psllq mm6, ShiftBpp   /* Move mask in mm6 to cover 3rd active */
+                                  /* byte group */
+            /* PRIME the pump (load the first Raw(x-bpp) data set */

             movq mm1, [edi+ebx-8]
 dsub3lp:
             movq mm1, [edi+ebx-8]
 dsub3lp:

-            psrlq mm1, ShiftRem   // Shift data for adding 1st bpp bytes
-                          // no need for mask; shift clears inactive bytes
-            // Add 1st active group
+            psrlq mm1, ShiftRem   /* Shift data for adding 1st bpp bytes */
+                          /* no need for mask; shift clears inactive bytes */
+            /* Add 1st active group */

             movq mm0, [edi+ebx]
             paddb mm0, mm1
             movq mm0, [edi+ebx]
             paddb mm0, mm1

-            // Add 2nd active group
-            movq mm1, mm0         // mov updated Raws to mm1
-            psllq mm1, ShiftBpp   // shift data to position correctly
-            pand mm1, mm7         // mask to use only 2nd active group
+            /* Add 2nd active group */
+            movq mm1, mm0         /* mov updated Raws to mm1 */
+            psllq mm1, ShiftBpp   /* shift data to position correctly */
+            pand mm1, mm7         /* mask to use only 2nd active group */

             paddb mm0, mm1
             paddb mm0, mm1

-            // Add 3rd active group
-            movq mm1, mm0         // mov updated Raws to mm1
-            psllq mm1, ShiftBpp   // shift data to position correctly
-            pand mm1, mm6         // mask to use only 3rd active group
+            /* Add 3rd active group */
+            movq mm1, mm0         /* mov updated Raws to mm1 */
+            psllq mm1, ShiftBpp   /* shift data to position correctly */
+            pand mm1, mm6         /* mask to use only 3rd active group */

             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength
             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength

-            movq [edi+ebx-8], mm0     // Write updated Raws back to array
-            // Prep for doing 1st add at top of loop
+            movq [edi+ebx-8], mm0     /* Write updated Raws back to array */
+            /* Prep for doing 1st add at top of loop */

             movq mm1, mm0
             jb dsub3lp
             movq mm1, mm0
             jb dsub3lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       case 1:
       {
       }
       break;
 
       case 1:
       {

-         // Placed here just in case this is a duplicate of the
-         // non-MMX code for the SUB filter in png_read_filter_row below
+         /* Placed here just in case this is a duplicate of the */
+         /* non-MMX code for the SUB filter in png_read_filter_row below */

          //
          //

-         //         png_bytep rp;
-         //         png_bytep lp;
-         //         png_uint_32 i;
-         //         bpp = (row_info->pixel_depth + 7) >> 3;
-         //         for (i = (png_uint_32)bpp, rp = row + bpp, lp = row;
-         //            i < row_info->rowbytes; i++, rp++, lp++)
-         //      {
-         //            *rp = (png_byte)(((int)(*rp) + (int)(*lp)) & 0xff);
-         //      }
+         /*         png_bytep rp; */
+         /*         png_bytep lp; */
+         /*         png_uint_32 i; */
+         /*         bpp = (row_info->pixel_depth + 7) >> 3; */
+         /*         for (i = (png_uint_32)bpp, rp = row + bpp, lp = row; */
+         /*            i < row_info->rowbytes; i++, rp++, lp++) */
+         /*      { */
+         /*            *rp = (png_byte)(((int)(*rp) + (int)(*lp)) & 0xff); */
+         /*      } */

          _asm {
             mov ebx, diff
             mov edi, row
             cmp ebx, FullLength
             jnb dsub1end
          _asm {
             mov ebx, diff
             mov edi, row
             cmp ebx, FullLength
             jnb dsub1end

-            mov esi, edi          // lp = row
+            mov esi, edi          /* lp = row */

             xor eax, eax
             xor eax, eax

-            add edi, bpp      // rp = row + bpp
+            add edi, bpp      /* rp = row + bpp */

 dsub1lp:
             mov al, [esi+ebx]
             add [edi+ebx], al
 dsub1lp:
             mov al, [esi+ebx]
             add [edi+ebx], al


@@ -3339,7 +3368,7 @@ dsub1lp:
             cmp ebx, FullLength
             jb dsub1lp
 dsub1end:
             cmp ebx, FullLength
             jb dsub1lp
 dsub1end:

-         } // end _asm block
+         } /* end _asm block */

       }
       return;
 
       }
       return;
 


@@ -3353,77 +3382,77 @@ dsub1end:
          _asm {
             mov edi, row
             mov ebx, diff
          _asm {
             mov edi, row
             mov ebx, diff

-            mov esi, edi               // lp = row
-            add edi, bpp           // rp = row + bpp
-            // PRIME the pump (load the first Raw(x-bpp) data set
+            mov esi, edi               /* lp = row */
+            add edi, bpp           /* rp = row + bpp */
+            /* PRIME the pump (load the first Raw(x-bpp) data set */

             movq mm1, [edi+ebx-8]
 dsub4lp:
             movq mm1, [edi+ebx-8]
 dsub4lp:

-            psrlq mm1, ShiftRem // Shift data for adding 1st bpp bytes
-                          // no need for mask; shift clears inactive bytes
+            psrlq mm1, ShiftRem /* Shift data for adding 1st bpp bytes */
+                          /* no need for mask; shift clears inactive bytes */

             movq mm0, [edi+ebx]
             paddb mm0, mm1
             movq mm0, [edi+ebx]
             paddb mm0, mm1

-            // Add 2nd active group
-            movq mm1, mm0          // mov updated Raws to mm1
-            psllq mm1, ShiftBpp    // shift data to position correctly
-                                   // there is no need for any mask
-                                   // since shift clears inactive bits/bytes
+            /* Add 2nd active group */
+            movq mm1, mm0          /* mov updated Raws to mm1 */
+            psllq mm1, ShiftBpp    /* shift data to position correctly */
+                                   /* there is no need for any mask */
+                                   /* since shift clears inactive bits/bytes */

             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength
             movq [edi+ebx-8], mm0
             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength
             movq [edi+ebx-8], mm0

-            movq mm1, mm0          // Prep for doing 1st add at top of loop
+            movq mm1, mm0          /* Prep for doing 1st add at top of loop */

             jb dsub4lp
             jb dsub4lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       case 2:
       {
          ActiveMask.use  = 0x00000000ffff0000;
       }
       break;
 
       case 2:
       {
          ActiveMask.use  = 0x00000000ffff0000;

-         ShiftBpp.use = 16;       // == 2 * 8
-         ShiftRem.use = 48;       // == 64 - 16
+         ShiftBpp.use = 16;       /* == 2 * 8 */
+         ShiftRem.use = 48;       /* == 64 - 16 */

          _asm {
          _asm {

-            movq mm7, ActiveMask  // Load ActiveMask for 2nd active byte group
+            movq mm7, ActiveMask  /* Load ActiveMask for 2nd active byte group */

             mov ebx, diff
             movq mm6, mm7
             mov edi, row
             mov ebx, diff
             movq mm6, mm7
             mov edi, row

-            psllq mm6, ShiftBpp     // Move mask in mm6 to cover 3rd active
-                                    //  byte group
-            mov esi, edi            // lp = row
+            psllq mm6, ShiftBpp     /* Move mask in mm6 to cover 3rd active */
+                                    /*  byte group */
+            mov esi, edi            /* lp = row */

             movq mm5, mm6
             movq mm5, mm6

-            add edi, bpp            // rp = row + bpp
-            psllq mm5, ShiftBpp     // Move mask in mm5 to cover 4th active
-                                    //  byte group
-            // PRIME the pump (load the first Raw(x-bpp) data set
+            add edi, bpp            /* rp = row + bpp */
+            psllq mm5, ShiftBpp     /* Move mask in mm5 to cover 4th active */
+                                    /*  byte group */
+            /* PRIME the pump (load the first Raw(x-bpp) data set */

             movq mm1, [edi+ebx-8]
 dsub2lp:
             movq mm1, [edi+ebx-8]
 dsub2lp:

-            // Add 1st active group
-            psrlq mm1, ShiftRem     // Shift data for adding 1st bpp bytes
-                                    // no need for mask; shift clears inactive
-                                    //  bytes
+            /* Add 1st active group */
+            psrlq mm1, ShiftRem     /* Shift data for adding 1st bpp bytes */
+                                    /* no need for mask; shift clears inactive */
+                                    /*  bytes */

             movq mm0, [edi+ebx]
             paddb mm0, mm1
             movq mm0, [edi+ebx]
             paddb mm0, mm1

-            // Add 2nd active group
-            movq mm1, mm0           // mov updated Raws to mm1
-            psllq mm1, ShiftBpp     // shift data to position correctly
-            pand mm1, mm7           // mask to use only 2nd active group
+            /* Add 2nd active group */
+            movq mm1, mm0           /* mov updated Raws to mm1 */
+            psllq mm1, ShiftBpp     /* shift data to position correctly */
+            pand mm1, mm7           /* mask to use only 2nd active group */

             paddb mm0, mm1
             paddb mm0, mm1

-            // Add 3rd active group
-            movq mm1, mm0           // mov updated Raws to mm1
-            psllq mm1, ShiftBpp     // shift data to position correctly
-            pand mm1, mm6           // mask to use only 3rd active group
+            /* Add 3rd active group */
+            movq mm1, mm0           /* mov updated Raws to mm1 */
+            psllq mm1, ShiftBpp     /* shift data to position correctly */
+            pand mm1, mm6           /* mask to use only 3rd active group */

             paddb mm0, mm1
             paddb mm0, mm1

-            // Add 4th active group
-            movq mm1, mm0           // mov updated Raws to mm1
-            psllq mm1, ShiftBpp     // shift data to position correctly
-            pand mm1, mm5           // mask to use only 4th active group
+            /* Add 4th active group */
+            movq mm1, mm0           /* mov updated Raws to mm1 */
+            psllq mm1, ShiftBpp     /* shift data to position correctly */
+            pand mm1, mm5           /* mask to use only 4th active group */

             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength
             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength

-            movq [edi+ebx-8], mm0   // Write updated Raws back to array
-            movq mm1, mm0           // Prep for doing 1st add at top of loop
+            movq [edi+ebx-8], mm0   /* Write updated Raws back to array */
+            movq mm1, mm0           /* Prep for doing 1st add at top of loop */

             jb dsub2lp
             jb dsub2lp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
       case 8:
       }
       break;
       case 8:


@@ -3431,44 +3460,44 @@ dsub2lp:
          _asm {
             mov edi, row
             mov ebx, diff
          _asm {
             mov edi, row
             mov ebx, diff

-            mov esi, edi            // lp = row
-            add edi, bpp            // rp = row + bpp
+            mov esi, edi            /* lp = row */
+            add edi, bpp            /* rp = row + bpp */

             mov ecx, MMXLength
             mov ecx, MMXLength

-            movq mm7, [edi+ebx-8]   // PRIME the pump (load the first
-                                    // Raw(x-bpp) data set
-            and ecx, 0x0000003f     // calc bytes over mult of 64
+            movq mm7, [edi+ebx-8]   /* PRIME the pump (load the first */
+                                    /* Raw(x-bpp) data set */
+            and ecx, 0x0000003f     /* calc bytes over mult of 64 */

 dsub8lp:
 dsub8lp:

-            movq mm0, [edi+ebx]     // Load Sub(x) for 1st 8 bytes
+            movq mm0, [edi+ebx]     /* Load Sub(x) for 1st 8 bytes */

             paddb mm0, mm7
             paddb mm0, mm7

-            movq mm1, [edi+ebx+8]   // Load Sub(x) for 2nd 8 bytes
-            movq [edi+ebx], mm0    // Write Raw(x) for 1st 8 bytes
-                                   // Now mm0 will be used as Raw(x-bpp) for
-                                   // the 2nd group of 8 bytes.  This will be
-                                   // repeated for each group of 8 bytes with
-                                   // the 8th group being used as the Raw(x-bpp)
-                                   // for the 1st group of the next loop.
+            movq mm1, [edi+ebx+8]   /* Load Sub(x) for 2nd 8 bytes */
+            movq [edi+ebx], mm0    /* Write Raw(x) for 1st 8 bytes */
+                                   /* Now mm0 will be used as Raw(x-bpp) for */
+                                   /* the 2nd group of 8 bytes.  This will be */
+                                   /* repeated for each group of 8 bytes with */
+                                   /* the 8th group being used as the Raw(x-bpp) */
+                                   /* for the 1st group of the next loop. */

             paddb mm1, mm0
             paddb mm1, mm0

-            movq mm2, [edi+ebx+16]  // Load Sub(x) for 3rd 8 bytes
-            movq [edi+ebx+8], mm1   // Write Raw(x) for 2nd 8 bytes
+            movq mm2, [edi+ebx+16]  /* Load Sub(x) for 3rd 8 bytes */
+            movq [edi+ebx+8], mm1   /* Write Raw(x) for 2nd 8 bytes */

             paddb mm2, mm1
             paddb mm2, mm1

-            movq mm3, [edi+ebx+24]  // Load Sub(x) for 4th 8 bytes
-            movq [edi+ebx+16], mm2  // Write Raw(x) for 3rd 8 bytes
+            movq mm3, [edi+ebx+24]  /* Load Sub(x) for 4th 8 bytes */
+            movq [edi+ebx+16], mm2  /* Write Raw(x) for 3rd 8 bytes */

             paddb mm3, mm2
             paddb mm3, mm2

-            movq mm4, [edi+ebx+32]  // Load Sub(x) for 5th 8 bytes
-            movq [edi+ebx+24], mm3  // Write Raw(x) for 4th 8 bytes
+            movq mm4, [edi+ebx+32]  /* Load Sub(x) for 5th 8 bytes */
+            movq [edi+ebx+24], mm3  /* Write Raw(x) for 4th 8 bytes */

             paddb mm4, mm3
             paddb mm4, mm3

-            movq mm5, [edi+ebx+40]  // Load Sub(x) for 6th 8 bytes
-            movq [edi+ebx+32], mm4  // Write Raw(x) for 5th 8 bytes
+            movq mm5, [edi+ebx+40]  /* Load Sub(x) for 6th 8 bytes */
+            movq [edi+ebx+32], mm4  /* Write Raw(x) for 5th 8 bytes */

             paddb mm5, mm4
             paddb mm5, mm4

-            movq mm6, [edi+ebx+48]  // Load Sub(x) for 7th 8 bytes
-            movq [edi+ebx+40], mm5  // Write Raw(x) for 6th 8 bytes
+            movq mm6, [edi+ebx+48]  /* Load Sub(x) for 7th 8 bytes */
+            movq [edi+ebx+40], mm5  /* Write Raw(x) for 6th 8 bytes */

             paddb mm6, mm5
             paddb mm6, mm5

-            movq mm7, [edi+ebx+56]  // Load Sub(x) for 8th 8 bytes
-            movq [edi+ebx+48], mm6  // Write Raw(x) for 7th 8 bytes
+            movq mm7, [edi+ebx+56]  /* Load Sub(x) for 8th 8 bytes */
+            movq [edi+ebx+48], mm6  /* Write Raw(x) for 7th 8 bytes */

             add ebx, 64
             paddb mm7, mm6
             cmp ebx, ecx
             add ebx, 64
             paddb mm7, mm6
             cmp ebx, ecx

-            movq [edi+ebx-8], mm7   // Write Raw(x) for 8th 8 bytes
+            movq [edi+ebx-8], mm7   /* Write Raw(x) for 8th 8 bytes */

             jb dsub8lp
             cmp ebx, MMXLength
             jnb dsub8lt8
             jb dsub8lp
             cmp ebx, MMXLength
             jnb dsub8lt8


@@ -3477,45 +3506,45 @@ dsub8lpA:
             add ebx, 8
             paddb mm0, mm7
             cmp ebx, MMXLength
             add ebx, 8
             paddb mm0, mm7
             cmp ebx, MMXLength

-            movq [edi+ebx-8], mm0   // use -8 to offset early add to ebx
-            movq mm7, mm0           // Move calculated Raw(x) data to mm1 to
-                                    // be the new Raw(x-bpp) for the next loop
+            movq [edi+ebx-8], mm0   /* use -8 to offset early add to ebx */
+            movq mm7, mm0           /* Move calculated Raw(x) data to mm1 to */
+                                    /* be the new Raw(x-bpp) for the next loop */

             jb dsub8lpA
 dsub8lt8:
             jb dsub8lpA
 dsub8lt8:

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       }
       break;
 

-      default:                // bpp greater than 8 bytes
+      default:                /* bpp greater than 8 bytes */

       {
          _asm {
             mov ebx, diff
             mov edi, row
       {
          _asm {
             mov ebx, diff
             mov edi, row

-            mov esi, edi           // lp = row
-            add edi, bpp           // rp = row + bpp
+            mov esi, edi           /* lp = row */
+            add edi, bpp           /* rp = row + bpp */

 dsubAlp:
             movq mm0, [edi+ebx]
             movq mm1, [esi+ebx]
             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength
 dsubAlp:
             movq mm0, [edi+ebx]
             movq mm1, [esi+ebx]
             add ebx, 8
             paddb mm0, mm1
             cmp ebx, MMXLength

-            movq [edi+ebx-8], mm0  // mov does not affect flags; -8 to offset
-                                   //  add ebx
+            movq [edi+ebx-8], mm0  /* mov does not affect flags; -8 to offset */
+                                   /*  add ebx */

             jb dsubAlp
             jb dsubAlp

-         } // end _asm block
+         } /* end _asm block */

       }
       break;
 
       }
       break;
 

-   } // end switch ( bpp )
+   } /* end switch ( bpp ) */

 
    _asm {
         mov ebx, MMXLength
         mov edi, row
         cmp ebx, FullLength
         jnb dsubend
 
    _asm {
         mov ebx, MMXLength
         mov edi, row
         cmp ebx, FullLength
         jnb dsubend

-        mov esi, edi               // lp = row
+        mov esi, edi               /* lp = row */

         xor eax, eax
         xor eax, eax

-        add edi, bpp               // rp = row + bpp
+        add edi, bpp               /* rp = row + bpp */

 dsublp2:
         mov al, [esi+ebx]
         add [edi+ebx], al
 dsublp2:
         mov al, [esi+ebx]
         add [edi+ebx], al


@@ -3523,20 +3552,20 @@ dsublp2:
         cmp ebx, FullLength
         jb dsublp2
 dsubend:
         cmp ebx, FullLength
         jb dsublp2
 dsubend:

-        emms             // End MMX instructions; prep for possible FP instrs.
-   } // end _asm block
+        emms             /* End MMX instructions; prep for possible FP instrs. */
+   } /* end _asm block */

 }
 
 }
 

-// Optimized code for PNG Up filter decoder
+/* Optimized code for PNG Up filter decoder */

 void /* PRIVATE */
 png_read_filter_row_mmx_up(png_row_infop row_info, png_bytep row,
    png_bytep prev_row)
 {
    png_uint_32 len;
 void /* PRIVATE */
 png_read_filter_row_mmx_up(png_row_infop row_info, png_bytep row,
    png_bytep prev_row)
 {
    png_uint_32 len;

-   len  = row_info->rowbytes;       // # of bytes to filter
+   len  = row_info->rowbytes;       /* # of bytes to filter */

    _asm {
       mov edi, row
    _asm {
       mov edi, row

-      // get # of bytes to alignment
+      /* get # of bytes to alignment */

       mov ecx, edi
       xor ebx, ebx
       add ecx, 0x7
       mov ecx, edi
       xor ebx, ebx
       add ecx, 0x7


@@ -3545,22 +3574,22 @@ png_read_filter_row_mmx_up(png_row_infop row_info, png_bytep row,
       mov esi, prev_row
       sub ecx, edi
       jz dupgo
       mov esi, prev_row
       sub ecx, edi
       jz dupgo

-      // fix alignment
+      /* fix alignment */

 duplp1:
       mov al, [edi+ebx]
       add al, [esi+ebx]
       inc ebx
       cmp ebx, ecx
 duplp1:
       mov al, [edi+ebx]
       add al, [esi+ebx]
       inc ebx
       cmp ebx, ecx

-      mov [edi + ebx-1], al  // mov does not affect flags; -1 to offset inc ebx
+      mov [edi + ebx-1], al  /* mov does not affect flags; -1 to offset inc ebx */

       jb duplp1
 dupgo:
       mov ecx, len
       mov edx, ecx
       jb duplp1
 dupgo:
       mov ecx, len
       mov edx, ecx

-      sub edx, ebx                  // subtract alignment fix
-      and edx, 0x0000003f           // calc bytes over mult of 64
-      sub ecx, edx                  // drop over bytes from length
-      // Unrolled loop - use all MMX registers and interleave to reduce
-      // number of branch instructions (loops) and reduce partial stalls
+      sub edx, ebx                  /* subtract alignment fix */
+      and edx, 0x0000003f           /* calc bytes over mult of 64 */
+      sub ecx, edx                  /* drop over bytes from length */
+      /* Unrolled loop - use all MMX registers and interleave to reduce */
+      /* number of branch instructions (loops) and reduce partial stalls */

 duploop:
       movq mm1, [esi+ebx]
       movq mm0, [edi+ebx]
 duploop:
       movq mm1, [esi+ebx]
       movq mm0, [edi+ebx]


@@ -3595,54 +3624,54 @@ duploop:
       add ebx, 64
       paddb mm6, mm7
       cmp ebx, ecx
       add ebx, 64
       paddb mm6, mm7
       cmp ebx, ecx

-      movq [edi+ebx-8], mm6 // (+56)movq does not affect flags;
-                                     // -8 to offset add ebx
+      movq [edi+ebx-8], mm6 /* (+56)movq does not affect flags; */
+                                     /* -8 to offset add ebx */

       jb duploop
 
       jb duploop
 

-      cmp edx, 0                     // Test for bytes over mult of 64
+      cmp edx, 0                     /* Test for bytes over mult of 64 */

       jz dupend
 
 
       jz dupend
 
 

-      // 2 lines added by lcreeve@netins.net
-      // (mail 11 Jul 98 in png-implement list)
-      cmp edx, 8 //test for less than 8 bytes
+      /* 2 lines added by lcreeve@netins.net */
+      /* (mail 11 Jul 98 in png-implement list) */
+      cmp edx, 8 /*test for less than 8 bytes */

       jb duplt8
 
 
       add ecx, edx
       jb duplt8
 
 
       add ecx, edx

-      and edx, 0x00000007           // calc bytes over mult of 8
-      sub ecx, edx                  // drop over bytes from length
+      and edx, 0x00000007           /* calc bytes over mult of 8 */
+      sub ecx, edx                  /* drop over bytes from length */

       jz duplt8
       jz duplt8

-      // Loop using MMX registers mm0 & mm1 to update 8 bytes simultaneously
+      /* Loop using MMX registers mm0 & mm1 to update 8 bytes simultaneously */

 duplpA:
       movq mm1, [esi+ebx]
       movq mm0, [edi+ebx]
       add ebx, 8
       paddb mm0, mm1
       cmp ebx, ecx
 duplpA:
       movq mm1, [esi+ebx]
       movq mm0, [edi+ebx]
       add ebx, 8
       paddb mm0, mm1
       cmp ebx, ecx

-      movq [edi+ebx-8], mm0 // movq does not affect flags; -8 to offset add ebx
+      movq [edi+ebx-8], mm0 /* movq does not affect flags; -8 to offset add ebx */

       jb duplpA
       jb duplpA

-      cmp edx, 0            // Test for bytes over mult of 8
+      cmp edx, 0            /* Test for bytes over mult of 8 */

       jz dupend
 duplt8:
       xor eax, eax
       jz dupend
 duplt8:
       xor eax, eax

-      add ecx, edx          // move over byte count into counter
-      // Loop using x86 registers to update remaining bytes
+      add ecx, edx          /* move over byte count into counter */
+      /* Loop using x86 registers to update remaining bytes */

 duplp2:
       mov al, [edi + ebx]
       add al, [esi + ebx]
       inc ebx
       cmp ebx, ecx
 duplp2:
       mov al, [edi + ebx]
       add al, [esi + ebx]
       inc ebx
       cmp ebx, ecx

-      mov [edi + ebx-1], al // mov does not affect flags; -1 to offset inc ebx
+      mov [edi + ebx-1], al /* mov does not affect flags; -1 to offset inc ebx */

       jb duplp2
 dupend:
       jb duplp2
 dupend:

-      // Conversion of filtered row completed
-      emms          // End MMX instructions; prep for possible FP instrs.
-   } // end _asm block
+      /* Conversion of filtered row completed */
+      emms          /* End MMX instructions; prep for possible FP instrs. */
+   } /* end _asm block */

 }
 
 
 }
 
 

-// Optimized png_read_filter_row routines
+/* Optimized png_read_filter_row routines */

 void /* PRIVATE */
 png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
    row, png_bytep prev_row, int filter)
 void /* PRIVATE */
 png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
    row, png_bytep prev_row, int filter)


@@ -3652,8 +3681,10 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
 #endif
 
    if (mmx_supported == 2) {
 #endif
 
    if (mmx_supported == 2) {

+#if !defined(PNG_1_0_X)

        /* this should have happened in png_init_mmx_flags() already */
        png_warning(png_ptr, "asm_flags may not have been initialized");
        /* this should have happened in png_init_mmx_flags() already */
        png_warning(png_ptr, "asm_flags may not have been initialized");

+#endif

        png_mmx_support();
    }
 
        png_mmx_support();
    }
 


@@ -3663,6 +3694,7 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
    {
       case 0: sprintf(filnm, "none");
          break;
    {
       case 0: sprintf(filnm, "none");
          break;

+#if !defined(PNG_1_0_X)

       case 1: sprintf(filnm, "sub-%s",
         (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)? "MMX" : "x86");
          break;
       case 1: sprintf(filnm, "sub-%s",
         (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB)? "MMX" : "x86");
          break;


@@ -3675,6 +3707,16 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
       case 4: sprintf(filnm, "Paeth-%s",
         (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)? "MMX":"x86");
          break;
       case 4: sprintf(filnm, "Paeth-%s",
         (png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH)? "MMX":"x86");
          break;

+#else
+      case 1: sprintf(filnm, "sub");
+         break;
+      case 2: sprintf(filnm, "up");
+         break;
+      case 3: sprintf(filnm, "avg");
+         break;
+      case 4: sprintf(filnm, "Paeth");
+         break;
+#endif

       default: sprintf(filnm, "unknw");
          break;
    }
       default: sprintf(filnm, "unknw");
          break;
    }


@@ -3691,9 +3733,13 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
 
       case PNG_FILTER_VALUE_SUB:
       {
 
       case PNG_FILTER_VALUE_SUB:
       {

+#if !defined(PNG_1_0_X)

          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_SUB) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))

+#else
+         if (mmx_supported)
+#endif

          {
             png_read_filter_row_mmx_sub(row_info, row);
          }
          {
             png_read_filter_row_mmx_sub(row_info, row);
          }


@@ -3716,9 +3762,13 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
 
       case PNG_FILTER_VALUE_UP:
       {
 
       case PNG_FILTER_VALUE_UP:
       {

+#if !defined(PNG_1_0_X)

          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_UP) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))

+#else
+         if (mmx_supported)
+#endif

          {
             png_read_filter_row_mmx_up(row_info, row, prev_row);
          }
          {
             png_read_filter_row_mmx_up(row_info, row, prev_row);
          }


@@ -3740,9 +3790,13 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
 
       case PNG_FILTER_VALUE_AVG:
       {
 
       case PNG_FILTER_VALUE_AVG:
       {

+#if !defined(PNG_1_0_X)

          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_AVG) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))

+#else
+         if (mmx_supported)
+#endif

          {
             png_read_filter_row_mmx_avg(row_info, row, prev_row);
          }
          {
             png_read_filter_row_mmx_avg(row_info, row, prev_row);
          }


@@ -3774,9 +3828,13 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
 
       case PNG_FILTER_VALUE_PAETH:
       {
 
       case PNG_FILTER_VALUE_PAETH:
       {

+#if !defined(PNG_1_0_X)

          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))
          if ((png_ptr->asm_flags & PNG_ASM_FLAG_MMX_READ_FILTER_PAETH) &&
              (row_info->pixel_depth >= png_ptr->mmx_bitdepth_threshold) &&
              (row_info->rowbytes >= png_ptr->mmx_rowbytes_threshold))

+#else
+         if (mmx_supported)
+#endif

          {
             png_read_filter_row_mmx_paeth(row_info, row, prev_row);
          }
          {
             png_read_filter_row_mmx_paeth(row_info, row, prev_row);
          }


@@ -3796,7 +3854,7 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep
                rp++;
             }
 
                rp++;
             }
 

-            for (i = 0; i < istop; i++)   // use leftover rp,pp
+            for (i = 0; i < istop; i++)   /* use leftover rp,pp */

             {
                int a, b, c, pa, pb, pc, p;
 
             {
                int a, b, c, pa, pb, pc, p;