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Last change
on this file since 638 was
469,
checked in by alain, 6 years ago
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1) Introduce the libsemaphore library.
2) Introduce a small libmath library, required by the "fft" application..
3) Introduce the multithreaded "fft" application.
4) Fix a bad synchronisation bug in the Copy-On-Write mechanism.
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File size:
753 bytes
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| 1 | /* |
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| 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 | |
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| 12 | /* |
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| 13 | * Modified for ALMOS-MKH OS at UPMC, France, August 2018. (Alain Greiner) |
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| 14 | */ |
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| 15 | |
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| 16 | |
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| 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 | |
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| 22 | #include "math.h" |
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| 23 | #include "math_private.h" |
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| 24 | |
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| 25 | int isnan(double x) |
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| 26 | { |
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| 27 | int32_t hx,lx; |
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| 28 | EXTRACT_WORDS(hx,lx,x); |
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| 29 | hx &= 0x7fffffff; |
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| 30 | hx |= (uint32_t)(lx|(-lx))>>31; |
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| 31 | hx = 0x7ff00000 - hx; |
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| 32 | return (int)(((uint32_t)hx)>>31); |
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| 33 | } |
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