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| author | Dave Rigby <daver@couchbase.com> | 2014-09-22 14:54:33 (GMT) |
|---|---|---|
| committer | Dave Rigby <daver@couchbase.com> | 2014-09-24 10:55:02 (GMT) |
| commit | 112704cfbfacfc9cecdfb732741df47eb4133902 (patch) | |
| tree | 28b2e17230fe974cd7b6c3c839ad91c83d7edd82 | |
| parent | eb5376ab9e61d96daa0d1f03b4474baf5232478f (diff) | |
| download | jemalloc-112704cfbfacfc9cecdfb732741df47eb4133902.zip jemalloc-112704cfbfacfc9cecdfb732741df47eb4133902.tar.gz jemalloc-112704cfbfacfc9cecdfb732741df47eb4133902.tar.bz2 | |
Use MSVC intrinsics for lg_floor
When using MSVC make use of its intrinsic functions (supported on
x86, amd64 & ARM) for lg_floor.
| -rw-r--r-- | include/jemalloc/internal/util.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/jemalloc/internal/util.h b/include/jemalloc/internal/util.h index cc7806d..5af6832 100644 --- a/include/jemalloc/internal/util.h +++ b/include/jemalloc/internal/util.h @@ -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) |