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Merge pull request #129 from daverigby/msvc_lg_floor

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Use MSVC intrinsics for lg_floor
This commit is contained in:
Jason Evans 2014-09-29 15:15:31 -07:00
commit 5d9732f2cf
1 changed files with 15 additions and 0 deletions
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15
include/jemalloc/internal/util.h
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@ -176,6 +176,21 @@ lg_floor(size_t x)
);
return (ret);
}
#elif (defined(_MSC_VER))
JEMALLOC_INLINE size_t
lg_floor(size_t x)
{
unsigned long ret;
#if (LG_SIZEOF_PTR == 3)
_BitScanReverse64(&ret, x);
#elif (LG_SIZEOF_PTR == 2)
_BitScanReverse(&ret, x);
#else
# error "Unsupported type sizes for lg_floor()"
#endif
return (ret);
}
#elif (defined(JEMALLOC_HAVE_BUILTIN_CLZ))
JEMALLOC_INLINE size_t
lg_floor(size_t x)