mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
28 lines
650 B
28 lines
650 B
/* _Dtest function -- IEEE 754 version */
|
|
#include "wctype.h"
|
|
#include "xmath.h"
|
|
_STD_BEGIN
|
|
|
|
_CRTIMP2 short _Dtest(double *px)
|
|
{ /* categorize *px */
|
|
unsigned short *ps = (unsigned short *)px;
|
|
|
|
if ((ps[_D0] & _DMASK) == _DMAX << _DOFF)
|
|
return ((ps[_D0] & _DFRAC) != 0 || ps[_D1] != 0
|
|
|| ps[_D2] != 0 || ps[_D3] != 0 ? NAN : INF);
|
|
else if ((ps[_D0] & ~_DSIGN) != 0 || ps[_D1] != 0
|
|
|| ps[_D2] != 0 || ps[_D3] != 0)
|
|
return (FINITE);
|
|
else
|
|
return (0);
|
|
}
|
|
_STD_END
|
|
|
|
/*
|
|
* Copyright (c) 1994 by P.J. Plauger. ALL RIGHTS RESERVED.
|
|
* Consult your license regarding permissions and restrictions.
|
|
*/
|
|
|
|
/*
|
|
941029 pjp: added _STD machinery
|
|
*/
|