lib/libm/src/s_copysign.c

   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  * $NetBSD: s_copysign.c,v 1.11 2002/05/26 22:01:54 wiz Exp $
  13  * $DragonFly: src/lib/libm/src/s_copysign.c,v 1.1 2005/07/26 21:15:20 joerg Exp $
  14  */
  15
  16 /*
  17  * copysign(double x, double y)
  18  * copysign(x,y) returns a value with the magnitude of x and
  19  * with the sign bit of y.
  20  */
  21
  22 #include <math.h>
  23 #include "math_private.h"
  24
  25 double
  26 copysign(double x, double y)
  27 {
  28         u_int32_t hx,hy;
  29         GET_HIGH_WORD(hx,x);
  30         GET_HIGH_WORD(hy,y);
  31         SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
  32         return x;
  33 }