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Use optimized byte swap operations for Microsoft and GNU [Snyder].

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This commit is contained in:
Mark Adler 2012-02-11 00:26:38 -08:00
parent 1a4ba8cd91
commit 7d45cf5a1d
3 changed files with 19 additions and 13 deletions
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13
zutil.h
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@ -245,4 +245,17 @@ extern const char * const z_errmsg[10]; /* indexed by 2-zlib_error */
#define ZFREE(strm, addr) (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
#define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
/* Reverse the bytes in a 64-bit or 32-bit or 16-bit value */
#if defined(_WIN32) && (_MSC_VER >= 1300) && (defined(_M_IX86) || defined(_M_X64))
# include <stdlib.h>
# pragma intrinsic(_byteswap_ulong)
# define ZSWAP32(q) _byteswap_ulong(q)
#elif defined(__GNUC__) && ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3))
# include <byteswap.h>
# define ZSWAP32(q) __builtin_bswap32(q)
#else
# define ZSWAP32(q) ((((q) >> 24) & 0xff) + (((q) >> 8) & 0xff00) + \
(((q) & 0xff00) << 8) + (((q) & 0xff) << 24))
#endif
#endif /* ZUTIL_H */