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Replace bsf with tzcnt.

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This commit is contained in:
Bartosz Taudul 2020-05-17 01:09:57 +02:00
parent 665c6d6699
commit 3a302c18bc
1 changed files with 2 additions and 6 deletions
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8
common/tracy_lz4.cpp
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@ -479,9 +479,7 @@ unsigned LZ4_NbCommonBytes (reg_t val)
if (LZ4_isLittleEndian()) {
if (sizeof(val)==8) {
# if defined(_MSC_VER) && defined(_WIN64) && !defined(LZ4_FORCE_SW_BITCOUNT)
unsigned long r = 0;
_BitScanForward64( &r, (U64)val );
return (int)(r>>3);
return (unsigned)_tzcnt_u64((U64)val)>>3;
# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT)
return (__builtin_ctzll((U64)val) >> 3);
# else
@ -497,9 +495,7 @@ unsigned LZ4_NbCommonBytes (reg_t val)
# endif
} else /* 32 bits */ {
# if defined(_MSC_VER) && !defined(LZ4_FORCE_SW_BITCOUNT)
unsigned long r;
_BitScanForward( &r, (U32)val );
return (int)(r>>3);
return (unsigned)_tzcnt_u32((U32)val)>>3;
# elif (defined(__clang__) || (defined(__GNUC__) && (__GNUC__>=3))) && !defined(LZ4_FORCE_SW_BITCOUNT)
return (__builtin_ctz((U32)val) >> 3);
# else