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ntdll: Copy ceil() implementation from msvcrt. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2021-10-26 10:33:39 +02:00
parent bb9e068bab
commit fca34420f6
1 changed files with 23 additions and 2 deletions
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25
dlls/ntdll/math.c
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@ -146,10 +146,31 @@ double CDECL atan( double x )
/*********************************************************************
* ceil (NTDLL.@)
*
* Based on musl: src/math/ceilf.c
*/
double CDECL ceil( double d )
double CDECL ceil( double x )
{
return unix_funcs->ceil( d );
union {double f; UINT64 i;} u = {x};
int e = (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 == 0)
u.i += m;
u.i &= ~m;
} else {
if (u.i >> 63)
return -0.0;
else if (u.i << 1)
return 1.0;
}
return u.f;
}
/*********************************************************************