modules/fdlibm/src/s_copysign.cpp

   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 //__FBSDID("$FreeBSD$");
  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_private.h"
  23
  24 double
  25 copysign(double x, double y)
  26 {
  27         u_int32_t hx,hy;
  28         GET_HIGH_WORD(hx,x);
  29         GET_HIGH_WORD(hy,y);
  30         SET_HIGH_WORD(x,(hx&0x7fffffff)|(hy&0x80000000));
  31         return x;
  32 }