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author | bunnei <bunneidev@gmail.com> | 2019-03-29 02:41:40 +0100 |
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committer | GitHub <noreply@github.com> | 2019-03-29 02:41:40 +0100 |
commit | b404fcdf1443b91ac9994c05ad1fe039fcd9675e (patch) | |
tree | 42b6141dcd6a5315f9330f064524963a7915c28a /src/common/bit_util.h | |
parent | Merge pull request #2284 from lioncash/heap-alloc (diff) | |
parent | Fixes and corrections on formatting. (diff) | |
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Diffstat (limited to 'src/common/bit_util.h')
-rw-r--r-- | src/common/bit_util.h | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/common/bit_util.h b/src/common/bit_util.h index 1eea17ba1..a4f9ed4aa 100644 --- a/src/common/bit_util.h +++ b/src/common/bit_util.h @@ -58,4 +58,43 @@ inline u64 CountLeadingZeroes64(u64 value) { return __builtin_clzll(value); } #endif + +#ifdef _MSC_VER +inline u32 CountTrailingZeroes32(u32 value) { + unsigned long trailing_zero = 0; + + if (_BitScanForward(&trailing_zero, value) != 0) { + return trailing_zero; + } + + return 32; +} + +inline u64 CountTrailingZeroes64(u64 value) { + unsigned long trailing_zero = 0; + + if (_BitScanForward64(&trailing_zero, value) != 0) { + return trailing_zero; + } + + return 64; +} +#else +inline u32 CountTrailingZeroes32(u32 value) { + if (value == 0) { + return 32; + } + + return __builtin_ctz(value); +} + +inline u64 CountTrailingZeroes64(u64 value) { + if (value == 0) { + return 64; + } + + return __builtin_ctzll(value); +} +#endif + } // namespace Common |