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 #if defined(LIBM_SCCS) && !defined(lint) 14 static char rcsid[] = "$NetBSD: s_copysign.c,v 1.8 1995/05/10 20:46:57 jtc 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 <sys/cdefs.h> 24 #include <float.h> 25 #include <math.h> 26 27 #include "math_private.h" 28 29 double 30 copysign(double x, double y) 31 { 32 u_int32_t hx,hy; 33 GET_HIGH_WORD(hx,x); 34 GET_HIGH_WORD(hy,y); 35 SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); 36 return x; 37 } 38 39 #if LDBL_MANT_DIG == 53 40 #ifdef __weak_alias 41 __weak_alias(copysignl, copysign); 42 #endif /* __weak_alias */ 43 #endif /* LDBL_MANT_DIG == 53 */ 44