| /* |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| */ |
| |
| /* |
| * isnan(x) returns 1 is x is nan, else 0; |
| * no branching! |
| */ |
| |
| #include "math.h" |
| #include "math_private.h" |
| |
| int __isnan(double x) |
| { |
| int32_t hx,lx; |
| EXTRACT_WORDS(hx,lx,x); |
| hx &= 0x7fffffff; |
| hx |= (u_int32_t)(lx|(-lx))>>31; |
| hx = 0x7ff00000 - hx; |
| return (int)(((u_int32_t)hx)>>31); |
| } |
| libm_hidden_def(__isnan) |