Last change
on this file since 641 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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