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author | Zach Hilman <DarkLordZach@users.noreply.github.com> | 2019-07-05 19:39:13 +0200 |
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committer | GitHub <noreply@github.com> | 2019-07-05 19:39:13 +0200 |
commit | 772c86a260eb446b0fe4232b0a50666511bef25c (patch) | |
tree | 013d92268c06454c93565c83eff2b79b56a00839 /src/common/bit_util.h | |
parent | Merge pull request #2669 from FearlessTobi/move-cpujit-setting (diff) | |
parent | texture_cache: Address Feedback (diff) | |
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Diffstat (limited to 'src/common/bit_util.h')
-rw-r--r-- | src/common/bit_util.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/common/bit_util.h b/src/common/bit_util.h index d032df413..6f7d5a947 100644 --- a/src/common/bit_util.h +++ b/src/common/bit_util.h @@ -97,4 +97,48 @@ inline u32 CountTrailingZeroes64(u64 value) { } #endif +#ifdef _MSC_VER + +inline u32 MostSignificantBit32(const u32 value) { + unsigned long result; + _BitScanReverse(&result, value); + return static_cast<u32>(result); +} + +inline u32 MostSignificantBit64(const u64 value) { + unsigned long result; + _BitScanReverse64(&result, value); + return static_cast<u32>(result); +} + +#else + +inline u32 MostSignificantBit32(const u32 value) { + return 31U - static_cast<u32>(__builtin_clz(value)); +} + +inline u32 MostSignificantBit64(const u64 value) { + return 63U - static_cast<u32>(__builtin_clzll(value)); +} + +#endif + +inline u32 Log2Floor32(const u32 value) { + return MostSignificantBit32(value); +} + +inline u32 Log2Ceil32(const u32 value) { + const u32 log2_f = Log2Floor32(value); + return log2_f + ((value ^ (1U << log2_f)) != 0U); +} + +inline u32 Log2Floor64(const u64 value) { + return MostSignificantBit64(value); +} + +inline u32 Log2Ceil64(const u64 value) { + const u64 log2_f = static_cast<u64>(Log2Floor64(value)); + return static_cast<u32>(log2_f + ((value ^ (1ULL << log2_f)) != 0ULL)); +} + } // namespace Common |