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[Base] Fix tzcnt logic

This commit is contained in:
Triang3l 2019-07-31 23:08:41 +03:00
parent 669d83896d
commit e466687f11
1 changed files with 4 additions and 4 deletions
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8
src/xenia/base/math.h
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@ -128,28 +128,28 @@ inline uint8_t tzcnt(uint8_t v) {
unsigned long index; unsigned long index;
unsigned long mask = v; unsigned long mask = v;
unsigned char is_nonzero = _BitScanForward(&index, mask); unsigned char is_nonzero = _BitScanForward(&index, mask);
return static_cast<uint8_t>(is_nonzero ? int8_t(index) ^ 0x7 : 8); return static_cast<uint8_t>(is_nonzero ? int8_t(index) : 8);
} }
inline uint8_t tzcnt(uint16_t v) { inline uint8_t tzcnt(uint16_t v) {
unsigned long index; unsigned long index;
unsigned long mask = v; unsigned long mask = v;
unsigned char is_nonzero = _BitScanForward(&index, mask); unsigned char is_nonzero = _BitScanForward(&index, mask);
return static_cast<uint8_t>(is_nonzero ? int8_t(index) ^ 0xF : 16); return static_cast<uint8_t>(is_nonzero ? int8_t(index) : 16);
} }
inline uint8_t tzcnt(uint32_t v) { inline uint8_t tzcnt(uint32_t v) {
unsigned long index; unsigned long index;
unsigned long mask = v; unsigned long mask = v;
unsigned char is_nonzero = _BitScanForward(&index, mask); unsigned char is_nonzero = _BitScanForward(&index, mask);
return static_cast<uint8_t>(is_nonzero ? int8_t(index) ^ 0x1F : 32); return static_cast<uint8_t>(is_nonzero ? int8_t(index) : 32);
} }
inline uint8_t tzcnt(uint64_t v) { inline uint8_t tzcnt(uint64_t v) {
unsigned long index; unsigned long index;
unsigned long long mask = v; unsigned long long mask = v;
unsigned char is_nonzero = _BitScanForward64(&index, mask); unsigned char is_nonzero = _BitScanForward64(&index, mask);
return static_cast<uint8_t>(is_nonzero ? int8_t(index) ^ 0x3F : 64); return static_cast<uint8_t>(is_nonzero ? int8_t(index) : 64);
} }
#else // XE_PLATFORM_WIN32 #else // XE_PLATFORM_WIN32