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[] = "$Id: s_copysign.c,v 1.1.1.1 1994/08/19 09:39:51 jkh 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 #ifdef __STDC__ 27 double copysign(double x, double y) 28 #else 29 double copysign(x,y) 30 double x,y; 31 #endif 32 { 33 u_int32_t hx,hy; 34 GET_HIGH_WORD(hx,x); 35 GET_HIGH_WORD(hy,y); 36 SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000)); 37 return x; 38 } 39