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 #include <sys/cdefs.h> 14 #if defined(LIBM_SCCS) && !defined(lint) 15 __RCSID("$NetBSD: s_copysign.c,v 1.11 2002/05/26 22:01:54 wiz Exp $"); 16 #endif 17 18 /* 19 * copysign(double x, double y) 20 * copysign(x,y) returns a value with the magnitude of x and 21 * with the sign bit of y. 22 */ 23 24 #include "math.h" 25 #include "math_private.h" 26 27 double 28 copysign(double x, double y) 29 { 30 u_int32_t hx,hy; 31 GET_HIGH_WORD(hx,x); 32 GET_HIGH_WORD(hy,y); 33 SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); 34 return x; 35 } 36