projects / wxWidgets.git / blame
| Commit | Line | Data |
|---|---|---|
| f6bcfd97 BP |
1 | ; crc_lcc.asm, optimized CRC calculation function for Zip and UnZip, not |
| 2 | ; copyrighted by Paul Kienitz and Christian Spieler. Last revised 25 Mar 98. | |
| 3 | ; | |
| 4 | ; The code in this file has been copied verbatim from crc_i386.{asm|S}; | |
| 5 | ; only the assembler syntax and metacommands have been adapted to | |
| 6 | ; the habits of the free LCC-Win32 C compiler package. | |
| 7 | ; This version of the code uses the "optimized for i686" variant of | |
| 8 | ; crc_i386.{asm|S}. | |
| 9 | ; | |
| 10 | ; For more information (and a revision log), look into the original | |
| 11 | ; source files. | |
| 12 | ; | |
| 13 | .text | |
| 14 | .file "crc32.c" | |
| 15 | .text | |
| 16 | .type _crc32,function | |
| 17 | _crc32: | |
| 18 | pushl %ebp | |
| 19 | movl %esp,%ebp | |
| 20 | pushl %ecx | |
| 21 | pushl %ebx | |
| 22 | pushl %esi | |
| 23 | pushl %edi | |
| 24 | .line 34 | |
| 25 | .line 37 | |
| 26 | movl 12(%ebp),%esi | |
| 27 | subl %eax,%eax | |
| 28 | testl %esi,%esi | |
| 29 | jz _$3 | |
| 30 | .line 39 | |
| 31 | call _get_crc_table | |
| 32 | movl %eax,%edi | |
| 33 | .line 41 | |
| 34 | movl 8(%ebp),%eax | |
| 35 | movl 16(%ebp),%ecx | |
| 36 | notl %eax | |
| 37 | testl %ecx,%ecx | |
| 38 | jz _$4 | |
| 39 | _$5: | |
| 40 | testl $3,%esi | |
| 41 | jz _$6 | |
| 42 | xorb (%esi),%al | |
| 43 | incl %esi | |
| 44 | movzbl %al,%ebx | |
| 45 | shrl $8,%eax | |
| 46 | xorl (%edi,%ebx,4),%eax | |
| 47 | decl %ecx | |
| 48 | jnz _$5 | |
| 49 | _$6: | |
| 50 | movl %ecx,%edx | |
| 51 | andl $7,%edx | |
| 52 | shrl $3,%ecx | |
| 53 | jz _$8 | |
| 54 | _$7: | |
| 55 | xorl (%esi),%eax | |
| 56 | addl $4,%esi | |
| 57 | movzbl %al,%ebx | |
| 58 | shrl $8,%eax | |
| 59 | xorl (%edi,%ebx,4),%eax | |
| 60 | movzbl %al,%ebx | |
| 61 | shrl $8,%eax | |
| 62 | xorl (%edi,%ebx,4),%eax | |
| 63 | movzbl %al,%ebx | |
| 64 | shrl $8,%eax | |
| 65 | xorl (%edi,%ebx,4),%eax | |
| 66 | movzbl %al,%ebx | |
| 67 | shrl $8,%eax | |
| 68 | xorl (%edi,%ebx,4),%eax | |
| 69 | xorl (%esi),%eax | |
| 70 | addl $4,%esi | |
| 71 | movzbl %al,%ebx | |
| 72 | shrl $8,%eax | |
| 73 | xorl (%edi,%ebx,4),%eax | |
| 74 | movzbl %al,%ebx | |
| 75 | shrl $8,%eax | |
| 76 | xorl (%edi,%ebx,4),%eax | |
| 77 | movzbl %al,%ebx | |
| 78 | shrl $8,%eax | |
| 79 | xorl (%edi,%ebx,4),%eax | |
| 80 | movzbl %al,%ebx | |
| 81 | shrl $8,%eax | |
| 82 | xorl (%edi,%ebx,4),%eax | |
| 83 | decl %ecx | |
| 84 | jnz _$7 | |
| 85 | _$8: | |
| 86 | movl %edx,%ecx | |
| 87 | jecxz _$4 | |
| 88 | _$9: | |
| 89 | xorb (%esi),%al | |
| 90 | incl %esi | |
| 91 | movzbl %al,%ebx | |
| 92 | shrl $8,%eax | |
| 93 | xorl (%edi,%ebx,4),%eax | |
| 94 | decl %ecx | |
| 95 | jnz _$9 | |
| 96 | _$4: | |
| 97 | xorl $0xffffffff,%eax | |
| 98 | _$3: | |
| 99 | .line 52 | |
| 100 | popl %edi | |
| 101 | popl %esi | |
| 102 | popl %ebx | |
| 103 | leave | |
| 104 | ret | |
| 105 | _$34: | |
| 106 | .size _crc32,_$34-_crc32 | |
| 107 | .globl _crc32 | |
| 108 | .extern _get_crc_table |