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Last change
on this file was 469, checked in by alain, 8 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:
811 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 | * finite(x) returns 1 is x is finite, else 0;
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| 18 | * no branching!
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| 19 | */
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| 20 |
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| 21 | #include "math.h"
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| 22 | #include "math_private.h"
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| 23 |
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| 24 | int isfinite(double x)
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| 25 | {
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| 26 | uint32_t hx;
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| 27 |
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| 28 | GET_HIGH_WORD(hx, x);
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| 29 | /* Finite numbers have at least one zero bit in exponent. */
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| 30 | /* All other numbers will result in 0xffffffff after OR: */
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| 31 | return (hx | 0x800fffff) != 0xffffffff;
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| 32 | }
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| 33 |
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