X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/d7a4635391d9ff36152603ab6faa6eafa206750a..d27daedb6a0bf672508072100f20233d08ccf0e0:/apt-pkg/contrib/sha2_internal.cc

diff --git a/apt-pkg/contrib/sha2_internal.cc b/apt-pkg/contrib/sha2_internal.cc
index f84fb761c..f70b7b17d 100644
--- a/apt-pkg/contrib/sha2_internal.cc
+++ b/apt-pkg/contrib/sha2_internal.cc
@@ -33,6 +33,7 @@
  */
 #include <config.h>
 
+#include <endian.h>
 #include <string.h>	/* memcpy()/memset() or bcopy()/bzero() */
 #include <assert.h>	/* assert() */
 #include "sha2_internal.h"
@@ -65,7 +66,7 @@
  * Please make sure that your system defines BYTE_ORDER.  If your
  * architecture is little-endian, make sure it also defines
  * LITTLE_ENDIAN and that the two (BYTE_ORDER and LITTLE_ENDIAN) are
- * equivilent.
+ * equivalent.
  *
  * If your system does not define the above, then you can do so by
  * hand like this:
@@ -128,6 +129,14 @@ typedef u_int64_t sha2_word64;	/* Exactly 8 bytes */
 
 /*** ENDIAN REVERSAL MACROS *******************************************/
 #if BYTE_ORDER == LITTLE_ENDIAN
+#if defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
+#define REVERSE32(w,x)	{ \
+	(x) = __builtin_bswap32(w); \
+}
+#define REVERSE64(w,x)	{ \
+	(x) = __builtin_bswap64(w); \
+}
+#else
 #define REVERSE32(w,x)	{ \
 	sha2_word32 tmp = (w); \
 	tmp = (tmp >> 16) | (tmp << 16); \
@@ -141,6 +150,7 @@ typedef u_int64_t sha2_word64;	/* Exactly 8 bytes */
 	(x) = ((tmp & 0xffff0000ffff0000ULL) >> 16) | \
 	      ((tmp & 0x0000ffff0000ffffULL) << 16); \
 }
+#endif
 #endif /* BYTE_ORDER == LITTLE_ENDIAN */
 
 /*