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winnt.h: Add BitScanForward and BitScanReverse implementation.

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Signed-off-by: Jacek Caban <jacek@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Jacek Caban 2020-06-08 18:08:00 +02:00 committed by Alexandre Julliard
parent a240abf12b
commit 2618162e89
1 changed files with 52 additions and 0 deletions
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52
include/winnt.h
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@ -6717,6 +6717,58 @@ typedef enum _PROCESS_MITIGATION_POLICY
MaxProcessMitigationPolicy
} PROCESS_MITIGATION_POLICY, *PPROCESS_MITIGATION_POLICY;
#ifdef _MSC_VER
BOOLEAN _BitScanForward(unsigned long*,unsigned long);
BOOLEAN _BitScanReverse(unsigned long*,unsigned long);
#pragma intrinsic(_BitScanForward)
#pragma intrinsic(_BitScanReverse)
static inline BOOLEAN BitScanForward(DWORD *index, DWORD mask)
{
return _BitScanForward((unsigned long*)index, mask);
}
static inline BOOLEAN BitScanReverse(DWORD *index, DWORD mask)
{
return _BitScanReverse((unsigned long*)index, mask);
}
#elif defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3)))
static inline BOOLEAN BitScanForward(DWORD *index, DWORD mask)
{
*index = __builtin_ctz(mask);
return mask != 0;
}
static inline BOOLEAN BitScanReverse(DWORD *index, DWORD mask)
{
*index = 31 - __builtin_clz(mask);
return mask != 0;
}
#else
static inline BOOLEAN BitScanForward(DWORD *index, DWORD mask)
{
unsigned int r = 0;
while (r < 31 && !(mask & (1 << r))) r++;
*index = r;
return mask != 0;
}
static inline BOOLEAN BitScanReverse(DWORD *index, DWORD mask)
{
unsigned int r = 31;
while (r > 0 && !(mask & (1 << r))) r--;
*index = r;
return mask != 0;
}
#endif
#ifdef __cplusplus
}
#endif