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| Rev | Author | Line No. | Line |
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| 2 | pj | 1 | /* @(#)s_isnan.c 5.1 93/09/24 */ |
| 2 | /* |
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| 3 | * ==================================================== |
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| 4 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 5 | * |
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| 6 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 7 | * Permission to use, copy, modify, and distribute this |
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| 8 | * software is freely granted, provided that this notice |
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| 9 | * is preserved. |
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| 10 | * ==================================================== |
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| 11 | */ |
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| 12 | #if 0 |
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| 13 | #ifndef lint |
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| 14 | static char rcsid[] = "$\Id: s_isnan.c,v 1.2 1995/05/30 05:49:47 rgrimes Exp $"; |
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| 15 | #endif |
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| 16 | |||
| 17 | /* |
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| 18 | * isnan(x) returns 1 is x is nan, else 0; |
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| 19 | * no branching! |
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| 20 | */ |
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| 21 | |||
| 22 | #include "math.h" |
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| 23 | #include "math_private.h" |
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| 24 | |||
| 25 | #ifdef __STDC__ |
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| 26 | int isnan(double x) |
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| 27 | #else |
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| 28 | int isnan(x) |
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| 29 | double x; |
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| 30 | #endif |
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| 31 | { |
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| 32 | int32_t hx,lx; |
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| 33 | EXTRACT_WORDS(hx,lx,x); |
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| 34 | hx &= 0x7fffffff; |
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| 35 | hx |= (u_int32_t)(lx|(-lx))>>31; |
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| 36 | hx = 0x7ff00000 - hx; |
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| 37 | return (int)((u_int32_t)(hx))>>31; |
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| 38 | } |
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| 39 | #endif |