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Implement intrinsics CountTrailingZeroes and test it.

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This commit is contained in:
Fernando Sahmkow
2019-03-15 23:18:11 -04:00
committed by FernandoS27
parent 522957f9f3
commit 3bc815a5dc
3 changed files with 76 additions and 12 deletions
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45
src/common/bit_util.h
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@ -59,22 +59,43 @@ inline u64 CountLeadingZeroes64(u64 value) {
}
#endif
#ifdef _MSC_VER
inline u32 CountTrailingZeroes32(u32 value) {
u32 count = 0;
while (((value >> count) & 0xf) == 0 && count < 32)
count += 4;
while (((value >> count) & 1) == 0 && count < 32)
count++;
return count;
unsigned long trailing_zero = 0;
if (_BitScanForward(&trailing_zero, value) != 0) {
return trailing_zero;
}
return 32;
}
inline u64 CountTrailingZeroes64(u64 value) {
u64 count = 0;
while (((value >> count) & 0xf) == 0 && count < 64)
count += 4;
while (((value >> count) & 1) == 0 && count < 64)
count++;
return count;
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