ddidderr/zstd-rs
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Don't initialize the first parameter of _BitScanForward* functions

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Like the document example, no need to initialize `r` to 0.
https://docs.microsoft.com/en-us/cpp/intrinsics/bitscanforward-bitscanforward64
This commit is contained in:
Ma Lin
2021-09-25 16:36:53 +08:00
parent 95f492ea17
commit e5ba858270
5 changed files with 10 additions and 12 deletions
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lib/dictBuilder/zdict.c
+4 -6
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@@ -135,9 +135,8 @@ static unsigned ZDICT_NbCommonBytes (size_t val)
if (MEM_isLittleEndian()) {
if (MEM_64bits()) {
# if defined(_MSC_VER) && defined(_WIN64)
unsigned long r = 0;
_BitScanForward64( &r, (U64)val );
return (unsigned)(r>>3);
unsigned long r;
return _BitScanForward64(&r, (U64)val) ? (unsigned)(r >> 3) : 0;
# elif defined(__GNUC__) && (__GNUC__ >= 3)
return (unsigned)(__builtin_ctzll((U64)val) >> 3);
# else
@@ -146,9 +145,8 @@ static unsigned ZDICT_NbCommonBytes (size_t val)
# endif
} else { /* 32 bits */
# if defined(_MSC_VER)
unsigned long r=0;
_BitScanForward( &r, (U32)val );
return (unsigned)(r>>3);
unsigned long r;
return _BitScanForward(&r, (U32)val) ? (unsigned)(r >> 3) : 0;
# elif defined(__GNUC__) && (__GNUC__ >= 3)
return (unsigned)(__builtin_ctz((U32)val) >> 3);
# else