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msvcrt: Reimplement _isnan(). 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2020-11-16 12:18:03 +01:00
parent 9f088d019b
commit d6476e0097
1 changed files with 6 additions and 10 deletions
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16
dlls/msvcrt/math.c
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@ -242,12 +242,10 @@ int CDECL MSVCRT__finitef( float num )
/*********************************************************************
* _isnanf (MSVCRT.@)
*/
INT CDECL MSVCRT__isnanf( float num )
int CDECL MSVCRT__isnanf( float num )
{
/* Some implementations return -1 for true(glibc), msvcrt/crtdll return 1.
* Do the same, as the result may be used in calculations
*/
return isnan(num) != 0;
union { float f; UINT32 i; } u = { num };
return (u.i & 0x7fffffff) > 0x7f800000;
}
/*********************************************************************
@ -2234,12 +2232,10 @@ int CDECL MSVCRT_fesetenv(const MSVCRT_fenv_t *env)
/*********************************************************************
* _isnan (MSVCRT.@)
*/
INT CDECL MSVCRT__isnan(double num)
int CDECL MSVCRT__isnan(double num)
{
/* Some implementations return -1 for true(glibc), msvcrt/crtdll return 1.
* Do the same, as the result may be used in calculations
*/
return isnan(num) != 0;
union { double f; UINT64 i; } u = { num };
return (u.i & ~0ull >> 1) > 0x7ffull << 52;
}
/*********************************************************************