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ntdll: Copy floor() implementation from msvcrt. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2021-10-26 10:33:43 +02:00
parent fca34420f6
commit f0d3a7d33b
1 changed files with 23 additions and 2 deletions
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25
dlls/ntdll/math.c
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@ -191,10 +191,31 @@ double CDECL fabs( double d )
/*********************************************************************
* floor (NTDLL.@)
*
* Based on musl: src/math/floorf.c
*/
double CDECL floor( double d )
double CDECL floor( double x )
{
return unix_funcs->floor( d );
union {double f; UINT64 i;} u = {x};
int e = (int)(u.i >> 52 & 0x7ff) - 0x3ff;
UINT64 m;
if (e >= 52)
return x;
if (e >= 0) {
m = 0x000fffffffffffffULL >> e;
if ((u.i & m) == 0)
return x;
if (u.i >> 63)
u.i += m;
u.i &= ~m;
} else {
if (u.i >> 63 == 0)
return 0;
else if (u.i << 1)
return -1;
}
return u.f;
}
/*********************************************************************