compiler/mlib/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
  13 #ifndef lint
  14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_copysign.c,v 1.9 2003/07/23 04:53:46 peter 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 double
  27 copysign(double x, double y)
  28 {
  29         u_int32_t hx,hy;
  30         GET_HIGH_WORD(hx,x);
  31         GET_HIGH_WORD(hy,y);
  32         SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
  33         return x;
  34 }