| The Android Open Source Project | 1dc9e47 | 2009-03-03 19:28:35 -0800 | [diff] [blame] | 1 | /* @(#)s_copysign.c 5.1 93/09/24 */ |
| 2 | /* |
| 3 | * ==================================================== |
| 4 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| 5 | * |
| 6 | * Developed at SunPro, a Sun Microsystems, Inc. business. |
| 7 | * Permission to use, copy, modify, and distribute this |
| 8 | * software is freely granted, provided that this notice |
| 9 | * is preserved. |
| 10 | * ==================================================== |
| 11 | */ |
| 12 | |
| 13 | #ifndef lint |
| 14 | static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_copysign.c,v 1.9 2003/07/23 04:53:46 peter Exp $"; |
| 15 | #endif |
| 16 | |
| 17 | /* |
| 18 | * copysign(double x, double y) |
| 19 | * copysign(x,y) returns a value with the magnitude of x and |
| 20 | * with the sign bit of y. |
| 21 | */ |
| 22 | |
| 23 | #include "math.h" |
| 24 | #include "math_private.h" |
| 25 | |
| 26 | double |
| 27 | copysign(double x, double y) |
| 28 | { |
| 29 | u_int32_t hx,hy; |
| 30 | GET_HIGH_WORD(hx,x); |
| 31 | GET_HIGH_WORD(hy,y); |
| 32 | SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); |
| 33 | return x; |
| 34 | } |