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| 1906 | serge | 1 | /* |
| 2 | * ==================================================== |
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| 3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
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| 4 | * |
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| 5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
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| 6 | * Permission to use, copy, modify, and distribute this |
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| 7 | * software is freely granted, provided that this notice |
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| 8 | * is preserved. |
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| 9 | * ==================================================== |
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| 10 | */ |
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| 11 | |||
| 12 | |||
| 13 | /* |
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| 14 | * __isnand(x) returns 1 is x is nan, else 0; |
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| 15 | * no branching! |
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| 16 | */ |
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| 17 | |||
| 18 | #include "fdlibm.h" |
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| 19 | |||
| 20 | int |
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| 21 | _DEFUN (__isnand, (x), |
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| 22 | double x) |
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| 23 | { |
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| 24 | __int32_t hx,lx; |
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| 25 | EXTRACT_WORDS(hx,lx,x); |
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| 26 | hx &= 0x7fffffff; |
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| 27 | hx |= (__uint32_t)(lx|(-lx))>>31; |
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| 28 | hx = 0x7ff00000 - hx; |
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| 29 | return (int)(((__uint32_t)(hx))>>31); |
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| 30 | } |
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| 31 |