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Fix Windows build issues

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This resolves #333.
This commit is contained in:
Dmitri Smirnov
2016-02-23 11:39:02 -08:00
committed by Jason Evans
parent ae45142adc
commit b41a07c31a
4 changed files with 31 additions and 6 deletions
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30
include/msvc_compat/strings.h
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@@ -21,7 +21,37 @@ static __forceinline int ffs(int x)
return (ffsl(x));
}
# ifdef _M_X64
# pragma intrinsic(_BitScanForward64)
# endif
static __forceinline int ffsll(unsigned __int64 x)
{
unsigned long i;
#ifdef _M_X64
if (_BitScanForward64(&i, x))
return (i + 1);
return (0);
#else
// Fallback for 32-bit build where 64-bit version not available
// assuming little endian
union {
unsigned __int64 ll;
unsigned long l[2];
} s;
s.ll = x;
if (_BitScanForward(&i, s.l[0]))
return (i + 1);
else if(_BitScanForward(&i, s.l[1]))
return (i + 33);
return (0);
#endif
}
#else
# define ffsll(x) __builtin_ffsll(x)
# define ffsl(x) __builtin_ffsl(x)
# define ffs(x) __builtin_ffs(x)
#endif