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Last change
on this file since 628 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:
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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