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 1.13 2015/05/14 19:26:12 joerg 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 #if !defined(__HAVE_LONG_DOUBLE) && !defined(__HAVE_IBM_LONGDOUBLE) 28 __strong_alias(_copysignl, copysign) 29 __weak_alias(copysignl, copysign) 30 #endif 31 32 double 33 copysign(double x, double y) 34 { 35 u_int32_t hx,hy; 36 GET_HIGH_WORD(hx,x); 37 GET_HIGH_WORD(hy,y); 38 SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); 39 return x; 40 } 41