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[FAST486]: fixes for CountLeadingZeros64:

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- remove extra ';'
- This is (x)>0xff.... not >=
- Use Timo inline function.

svn path=/trunk/; revision=64676
This commit is contained in:
Hermès Bélusca-Maïto 2014-10-11 16:25:45 +00:00
parent 51ad4d4d0e
commit 2471c3b90f
1 changed files with 13 additions and 8 deletions
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21
reactos/lib/fast486/common.inl
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@ -25,21 +25,26 @@
/* PUBLIC FUNCTIONS ***********************************************************/ /* PUBLIC FUNCTIONS ***********************************************************/
#if defined (__GNUC__) #if defined (__GNUC__)
#define CountLeadingZeros64(x) __builtin_clzll(x); #define CountLeadingZeros64(x) __builtin_clzll(x)
#elif (_MSC_VER >= 1500) && defined(_WIN64) #elif (_MSC_VER >= 1500) && defined(_WIN64)
#define CountLeadingZeros64(x) __lzcnt64(x) #define CountLeadingZeros64(x) __lzcnt64(x)
#elif (_MSC_VER >= 1500) #elif (_MSC_VER >= 1500)
#define CountLeadingZeros64(x) ((x) >= 0xFFFFFFFFULL) \ #define CountLeadingZeros64(x) ((x) > 0xFFFFFFFFULL) ? __lzcnt((x) >> 32) \
? __lzcnt((x) >> 32) : (__lzcnt(x) + 32) : (__lzcnt(x) + 32)
#else #else
static static FORCEINLINE
FORCEINLINE
ULONG CountLeadingZeros64(ULONGLONG Value) ULONG CountLeadingZeros64(ULONGLONG Value)
{ {
ULONG LeadingZeros = 0; ULONG Count = 0;
ULONGLONG Mask = 1ULL << 63;
while (!(Value & (1 << (63 - LeadingZeros)))) LeadingZeros++; while (!(Value & Mask))
return LeadingZeros; {
Count++;
Mask >>= 1;
}
return Count;
} }
#endif #endif