ISAR/libmdbx
3
0
Fork 0
mirror of https://github.com/isar/libmdbx.git synced 2025-10-31 03:29:01 +08:00
Code Issues Packages Projects Releases Wiki Activity

mdbx: portability - drop unused mul_64x64_128().

Browse Source 
Change-Id: I034778dd99242eae92e9122156639ba7329638de
This commit is contained in:
Leonid Yuriev
2019-07-14 03:21:09 +03:00
parent 814f8fe7ab
commit 6eebac1510
1 changed files with 0 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
test/utils.h
View File

@@ -189,50 +189,6 @@ static __inline uint64_t rot64(uint64_t v, unsigned s) {
}
#endif /* rot64 */
#ifndef mul_32x32_64
static __inline uint64_t mul_32x32_64(uint32_t a, uint32_t b) {
return a * (uint64_t)b;
}
#endif /* mul_32x32_64 */
#ifndef mul_64x64_128
static __inline unsigned add_with_carry(uint64_t *sum, uint64_t addend) {
*sum += addend;
return (*sum < addend) ? 1u : 0u;
}
static __inline uint64_t mul_64x64_128(uint64_t a, uint64_t b, uint64_t *h) {
#if defined(__SIZEOF_INT128__) || \
(defined(_INTEGRAL_MAX_BITS) && _INTEGRAL_MAX_BITS >= 128)
__uint128_t r = (__uint128_t)a * (__uint128_t)b;
/* modern GCC could nicely optimize this */
*h = r >> 64;
return r;
#elif defined(mul_64x64_high)
*h = mul_64x64_high(a, b);
return a * b;
#else
/* performs 64x64 to 128 bit multiplication */
uint64_t ll = mul_32x32_64((uint32_t)a, (uint32_t)b);
uint64_t lh = mul_32x32_64(a >> 32, (uint32_t)b);
uint64_t hl = mul_32x32_64((uint32_t)a, b >> 32);
*h = mul_32x32_64(a >> 32, b >> 32) + (lh >> 32) + (hl >> 32) +
add_with_carry(&ll, lh << 32) + add_with_carry(&ll, hl << 32);
return ll;
#endif
}
#endif /* mul_64x64_128() */
#ifndef mul_64x64_high
static __inline uint64_t mul_64x64_high(uint64_t a, uint64_t b) {
uint64_t h;
mul_64x64_128(a, b, &h);
return h;
}
#endif /* mul_64x64_high */
static __inline bool is_power2(size_t x) { return (x & (x - 1)) == 0; }
#undef roundup2