| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ==================================================== |
| 3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 4 | * |
| 5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
| 6 | * Permission to use, copy, modify, and distribute this |
| 7 | * software is freely granted, provided that this notice |
| 8 | * is preserved. |
| 9 | * ==================================================== |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * isnan(x) returns 1 is x is nan, else 0; |
| 14 | * no branching! |
| 15 | */ |
| 16 | |
| 17 | #include "math.h" |
| 18 | #include "math_private.h" |
| 19 | |
| 20 | int __isnan(double x) |
| 21 | { |
| 22 | int32_t hx,lx; |
| 23 | EXTRACT_WORDS(hx,lx,x); |
| 24 | hx &= 0x7fffffff; |
| 25 | hx |= (u_int32_t)(lx|(-lx))>>31; |
| 26 | hx = 0x7ff00000 - hx; |
| 27 | return (int)(((u_int32_t)hx)>>31); |
| 28 | } |
| 29 | libm_hidden_def(__isnan) |