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.
34 lines
742 B
34 lines
742 B
|
|
/* @(#)s_isnan.c 1.3 95/01/18 */ |
|
/* |
|
* ==================================================== |
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
|
* |
|
* Developed at SunSoft, a Sun Microsystems, Inc. business. |
|
* Permission to use, copy, modify, and distribute this |
|
* software is freely granted, provided that this notice |
|
* is preserved. |
|
* ==================================================== |
|
*/ |
|
|
|
/* |
|
* ieee_isnan(x) returns 1 is x is nan, else 0; |
|
* no branching! |
|
*/ |
|
|
|
#include "fdlibm.h" |
|
|
|
#ifdef __STDC__ |
|
int ieee_isnan(double x) |
|
#else |
|
int ieee_isnan(x) |
|
double x; |
|
#endif |
|
{ |
|
int hx,lx; |
|
hx = (__HI(x)&0x7fffffff); |
|
lx = __LO(x); |
|
hx |= (unsigned)(lx|(-lx))>>31; |
|
hx = 0x7ff00000 - hx; |
|
return ((unsigned)(hx))>>31; |
|
}
|
|
|