| /* @(#)s_isnan.c 5.1 93/09/24 */ |
| /* |
| * ==================================================== |
| * 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> |
| #include <stdint.h> |
| |
| #undef __isnan |
| int __isnan(double x) |
| { |
| int64_t hx; |
| EXTRACT_WORDS64(hx,x); |
| hx &= UINT64_C(0x7fffffffffffffff); |
| hx = UINT64_C(0x7ff0000000000000) - hx; |
| return (int)(((uint64_t)hx)>>63); |
| } |
| hidden_def (__isnan) |
| weak_alias (__isnan, isnan) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__isnan, __isnanl) |
| weak_alias (__isnan, isnanl) |
| #endif |
