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Add back check to prevent Win32 static analysis issues

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This commit is contained in:
Elliot Gorokhovsky 2022-02-15 11:41:09 -05:00
parent 7c674a0919
commit 00f2acba36
1 changed files with 32 additions and 12 deletions
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44
lib/common/bits.h
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@ -32,9 +32,14 @@ MEM_STATIC unsigned ZSTD_countTrailingZeros32(U32 val)
# if STATIC_BMI2 == 1
return _tzcnt_u32(val);
# else
unsigned long r;
_BitScanForward(&r, val);
return (unsigned)r;
if (val != 0) {
unsigned long r;
_BitScanForward(&r, val);
return (unsigned)r;
} else {
/* Should not reach this code path */
__assume(0);
}
# endif
# elif defined(__GNUC__) && (__GNUC__ >= 4)
return (unsigned)__builtin_ctz(val);
@ -62,9 +67,14 @@ MEM_STATIC unsigned ZSTD_countLeadingZeros32(U32 val)
# if STATIC_BMI2 == 1
return _lzcnt_u32(val);
# else
unsigned long r;
_BitScanReverse(&r, val);
return (unsigned)(r ^ 31);
if (val != 0) {
unsigned long r;
_BitScanReverse(&r, val);
return (unsigned)(r ^ 31);
} else {
/* Should not reach this code path */
__assume(0);
}
# endif
# elif defined(__GNUC__) && (__GNUC__ >= 4)
return (unsigned)__builtin_clz(val);
@ -80,9 +90,14 @@ MEM_STATIC unsigned ZSTD_countTrailingZeros64(U64 val)
# if STATIC_BMI2 == 1
return _tzcnt_u64(val);
# else
unsigned long r;
_BitScanForward64(&r, val);
return (unsigned)r;
if (val != 0) {
unsigned long r;
_BitScanForward64(&r, val);
return (unsigned)r;
} else {
/* Should not reach this code path */
__assume(0);
}
# endif
# elif defined(__GNUC__) && (__GNUC__ >= 4) && defined(__LP64__)
return (unsigned)__builtin_ctzll(val);
@ -106,9 +121,14 @@ MEM_STATIC unsigned ZSTD_countLeadingZeros64(U64 val)
# if STATIC_BMI2 == 1
return _lzcnt_u64(val);
# else
unsigned long r;
_BitScanReverse64(&r, val);
return (unsigned)(r ^ 63);
if (val != 0) {
unsigned long r;
_BitScanReverse64(&r, val);
return (unsigned)(r ^ 63);
} else {
/* Should not reach this code path */
__assume(0);
}
# endif
# elif defined(__GNUC__) && (__GNUC__ >= 4)
return (unsigned)(__builtin_clzll(val));