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Uses a better endianess swap.

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This commit is contained in:
Andrea Mazzoleni 2013-12-18 19:42:56 +01:00
parent 209985ab9d
commit e4938013a3
1 changed files with 18 additions and 7 deletions
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25
util.c
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@ -1493,7 +1493,10 @@ char* strdup_nofail(const char* str)
/****************************************************************************/
/* byte operations */
/* Rotate left */
/*
* Rotate left.
* In x86/x64 they are optimized with a single assembler instruction.
*/
static inline uint32_t util_rotl32(uint32_t x, int8_t r)
{
return (x << r) | (x >> (32 - r));
@ -1504,8 +1507,16 @@ static inline uint64_t util_rotl64(uint64_t x, int8_t r)
return (x << r) | (x >> (64 - r));
}
/* Swap endianess */
#if HAVE_BYTESWAP_H
/**
* Swap endianess.
* They are needed only if BigEndian.
*/
#if defined(__GNUC__)
#define util_swap32(x) __builtin_bswap32(x)
#define util_swap64(x) __builtin_bswap64(x)
#elif HAVE_BYTESWAP_H
#include <byteswap.h>
@ -1521,10 +1532,10 @@ static inline uint32_t util_swap32(uint32_t v)
static inline uint64_t util_swap64(uint64_t v)
{
return (util_rotl64(v, 8) & 0x000000ff000000ffLLU)
| (util_rotl64(v, 24) & 0x0000ff000000ff00LLU)
| (util_rotl64(v, 40) & 0x00ff000000ff0000LLU)
| (util_rotl64(v, 56) & 0xff000000ff000000LLU);
return (util_rotl64(v, 8) & 0x000000ff000000ffULL)
| (util_rotl64(v, 24) & 0x0000ff000000ff00ULL)
| (util_rotl64(v, 40) & 0x00ff000000ff0000ULL)
| (util_rotl64(v, 56) & 0xff000000ff000000ULL);
}
#endif