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Add 64 bit bswap and rotates.

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This commit is contained in:
Mike Pall 2010-12-11 21:20:12 +01:00
parent 5f7e9173db
commit 476259e87e
1 changed files with 20 additions and 2 deletions
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22
src/lj_def.h
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@ -94,8 +94,8 @@ typedef unsigned __int32 uintptr_t;
#define checkptr32(x) ((uintptr_t)(x) == (uint32_t)(uintptr_t)(x))
/* Every half-decent C compiler transforms this into a rotate instruction. */
#define lj_rol(x, n) (((x)<<(n)) | ((x)>>(32-(n))))
#define lj_ror(x, n) (((x)<<(32-(n))) | ((x)>>(n)))
#define lj_rol(x, n) (((x)<<(n)) | ((x)>>(8*sizeof(x)-(n))))
#define lj_ror(x, n) (((x)<<(8*sizeof(x)-(n))) | ((x)>>(n)))
/* A really naive Bloom filter. But sufficient for our needs. */
typedef uintptr_t BloomFilter;
@ -143,11 +143,28 @@ static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
{
return (uint32_t)__builtin_bswap32((int32_t)x);
}
static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
{
return (uint64_t)__builtin_bswap64((int64_t)x);
}
#elif defined(__i386__) || defined(__x86_64__)
static LJ_AINLINE uint32_t lj_bswap(uint32_t x)
{
uint32_t r; __asm__("bswap %0" : "=r" (r) : "0" (x)); return r;
}
#if defined(__i386__)
static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
{
return ((uint64_t)lj_bswap((uint32_t)x)<<32) | lj_bswap((uint32_t)(x>>32));
}
#else
static LJ_AINLINE uint64_t lj_bswap64(uint64_t x)
{
uint64_t r; __asm__("bswap %0" : "=r" (r) : "0" (x)); return r;
}
#endif
#else
#error "missing define for lj_bswap()"
#endif
@ -174,6 +191,7 @@ static LJ_AINLINE uint32_t lj_fls(uint32_t x)
}
#define lj_bswap(x) (_byteswap_ulong((x)))
#define lj_bswap64(x) (_byteswap_uint64((x)))
#else
#error "missing defines for your compiler"