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Fix internal::clzll on Win64

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This commit is contained in:
Victor Zverovich 2015-02-22 06:31:55 -08:00
parent a81baf2904
commit d06ff7a7e8
1 changed files with 3 additions and 3 deletions
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6
format.h
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@ -56,18 +56,18 @@ inline uint32_t clz(uint32_t x) {
return 31 - r;
}
# define FMT_BUILTIN_CLZ(n) fmt::internal::clz(n)
inline uint32_t clzll(uint64_t n) {
inline uint32_t clzll(uint64_t x) {
unsigned long r = 0;
# ifdef _WIN64
# pragma intrinsic(_BitScanReverse64)
_BitScanReverse64(&r, x);
# else
// Scan the high 32 bits.
if (_BitScanReverse(&r, static_cast<uint32_t>(n >> 32)))
if (_BitScanReverse(&r, static_cast<uint32_t>(x >> 32)))
return 63 - (r + 32);
// Scan the low 32 bits.
_BitScanReverse(&r, static_cast<uint32_t>(n));
_BitScanReverse(&r, static_cast<uint32_t>(x));
# endif
return 63 - r;
}