comparison mercurial/util.h @ 19744:06badf7d10dc

util.h: getbe32() and putbe32() use intrinsic function to improve performance

Refer to https://bugzilla.mozilla.org/show_bug.cgi?id=351557. It can improve
byte-swapping performance by intrinsic function.

19743:fdd41257def8

#ifdef __linux
#define inline __inline
#endif

static inline uint32_t getbe32(const char *c)
{
	const unsigned char *d = (const unsigned char *)c;

	return ((d[0] << 24) |
		(d[1] << 16) |
		(d[2] << 8) |
		(d[3]));
}

static inline void putbe32(uint32_t x, char *c)
{
	c[0] = (x >> 24) & 0xff;
	c[1] = (x >> 16) & 0xff;
	c[2] = (x >> 8) & 0xff;
	c[3] = (x) & 0xff;
}

#endif /* _HG_UTIL_H_ */

19744:06badf7d10dc

#ifdef __linux
#define inline __inline
#endif

#if defined(_MSC_VER) && (_MSC_VER >= 1300)
static inline uint32_t getbe32(const char *c)
{
	return _byteswap_ulong(*(uint32_t *)c);
}
#elif GCC_VERSION >= 403
static inline uint32_t getbe32(const char *c)
{
	return __builtin_bswap32(*(uint32_t *)c);
}
#else
static inline uint32_t getbe32(const char *c)
{
	const unsigned char *d = (const unsigned char *)c;

	return ((d[0] << 24) |
		(d[1] << 16) |
		(d[2] << 8) |
		(d[3]));
}
#endif

#if defined(_MSC_VER) && (_MSC_VER >= 1300)
static inline void putbe32(uint32_t x, char *c)
{
	x = _byteswap_ulong(x);
	*(uint32_t *)c = x;
}
#elif GCC_VERSION >= 403
static inline void putbe32(uint32_t x, char *c)
{
	x = __builtin_bswap32(x);
	*(uint32_t *)c = x;
}
#else
static inline void putbe32(uint32_t x, char *c)
{
	c[0] = (x >> 24) & 0xff;
	c[1] = (x >> 16) & 0xff;
	c[2] = (x >> 8) & 0xff;
	c[3] = (x) & 0xff;
}
#endif

#endif /* _HG_UTIL_H_ */