|
Last change
on this file since 591 was
469,
checked in by alain, 6 years ago
|
|
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.
|
|
File size:
808 bytes
|
| Rev | Line | |
|---|
| [469] | 1 | /* |
|---|
| 2 | * ==================================================== |
|---|
| 3 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
|---|
| 4 | * |
|---|
| 5 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
|---|
| 6 | * Permission to use, copy, modify, and distribute this |
|---|
| 7 | * software is freely granted, provided that this notice |
|---|
| 8 | * is preserved. |
|---|
| 9 | * ==================================================== |
|---|
| 10 | */ |
|---|
| 11 | |
|---|
| 12 | /* |
|---|
| 13 | * Modified for ALMOS-MKH OS at UPMC, France, August 2018. (Alain Greiner) |
|---|
| 14 | */ |
|---|
| 15 | |
|---|
| 16 | /* |
|---|
| 17 | * copysign(double x, double y) |
|---|
| 18 | * copysign(x,y) returns a value with the magnitude of x and |
|---|
| 19 | * with the sign bit of y. |
|---|
| 20 | */ |
|---|
| 21 | |
|---|
| 22 | #include "math.h" |
|---|
| 23 | #include "math_private.h" |
|---|
| 24 | |
|---|
| 25 | double copysign(double x, double y) |
|---|
| 26 | { |
|---|
| 27 | uint32_t hx,hy; |
|---|
| 28 | GET_HIGH_WORD(hx,x); |
|---|
| 29 | GET_HIGH_WORD(hy,y); |
|---|
| 30 | SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); |
|---|
| 31 | return x; |
|---|
| 32 | } |
|---|
| 33 | |
|---|
Note: See
TracBrowser
for help on using the repository browser.
