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Last change
on this file since 590 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:
808 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 | * copysign(double x, double y) |
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| 18 | * copysign(x,y) returns a value with the magnitude of x and |
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| 19 | * with the sign bit of y. |
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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 | double copysign(double x, double y) |
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| 26 | { |
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| 27 | uint32_t hx,hy; |
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| 28 | GET_HIGH_WORD(hx,x); |
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| 29 | GET_HIGH_WORD(hy,y); |
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| 30 | SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); |
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| 31 | return x; |
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| 32 | } |
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| 33 | |
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