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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
/*
* Default version that the compiler ought to optimize properly with
* constant values.
*/
GIT_INLINE(uint32_t) default_swab32(uint32_t val)
{
return (((val & 0xff000000) >> 24) |
((val & 0x00ff0000) >> 8) |
((val & 0x0000ff00) << 8) |
((val & 0x000000ff) << 24));
}
#undef bswap32
GIT_INLINE(uint16_t) default_swab16(uint16_t val)
{
return (((val & 0xff00) >> 8) |
((val & 0x00ff) << 8));
}
#undef bswap16
#if defined(__GNUC__) && defined(__i386__)
#define bswap32(x) ({ \
uint32_t __res; \
if (__builtin_constant_p(x)) { \
__res = default_swab32(x); \
} else { \
__asm__("bswap %0" : "=r" (__res) : "0" ((uint32_t)(x))); \
} \
__res; })
#define bswap16(x) ({ \
uint16_t __res; \
if (__builtin_constant_p(x)) { \
__res = default_swab16(x); \
} else { \
__asm__("xchgb %b0,%h0" : "=q" (__res) : "0" ((uint16_t)(x))); \
} \
__res; })
#elif defined(__GNUC__) && defined(__x86_64__)
#define bswap32(x) ({ \
uint32_t __res; \
if (__builtin_constant_p(x)) { \
__res = default_swab32(x); \
} else { \
__asm__("bswapl %0" : "=r" (__res) : "0" ((uint32_t)(x))); \
} \
__res; })
#define bswap16(x) ({ \
uint16_t __res; \
if (__builtin_constant_p(x)) { \
__res = default_swab16(x); \
} else { \
__asm__("xchgb %b0,%h0" : "=Q" (__res) : "0" ((uint16_t)(x))); \
} \
__res; })
#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
#include <stdlib.h>
#define bswap32(x) _byteswap_ulong(x)
#define bswap16(x) _byteswap_ushort(x)
#endif
#ifdef bswap32
#undef ntohl
#undef htonl
#define ntohl(x) bswap32(x)
#define htonl(x) bswap32(x)
#endif
#ifdef bswap16
#undef ntohs
#undef htons
#define ntohs(x) bswap16(x)
#define htons(x) bswap16(x)
#endif
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