diff options
| author | Jason Evans <jasone@canonware.com> | 2014-09-29 22:15:31 (GMT) |
|---|---|---|
| committer | Jason Evans <jasone@canonware.com> | 2014-09-29 22:15:31 (GMT) |
| commit | 5d9732f2cf03e8f1639e20eb327100480b3f96dc (patch) | |
| tree | c630709b49c8dfcf23161b61829beccce48f6986 | |
| parent | e3a16fce5eb0c62a49e751f156d040c9f77fbc23 (diff) | |
| parent | 112704cfbfacfc9cecdfb732741df47eb4133902 (diff) | |
| download | jemalloc-5d9732f2cf03e8f1639e20eb327100480b3f96dc.zip jemalloc-5d9732f2cf03e8f1639e20eb327100480b3f96dc.tar.gz jemalloc-5d9732f2cf03e8f1639e20eb327100480b3f96dc.tar.bz2 | |
Merge pull request #129 from daverigby/msvc_lg_floor
Use MSVC intrinsics 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) |