libjava/classpath/native/fdlibm/s_copysign.c

   1
   2 /* @(#)s_copysign.c 1.3 95/01/18 */
   3 /*
   4  * ====================================================
   5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * Developed at SunSoft, a Sun Microsystems, Inc. business.
   8  * Permission to use, copy, modify, and distribute this
   9  * software is freely granted, provided that this notice
  10  * is preserved.
  11  * ====================================================
  12  */
  13
  14 /*
  15  * copysign(double x, double y)
  16  * copysign(x,y) returns a value with the magnitude of x and
  17  * with the sign bit of y.
  18  */
  19
  20 #include "fdlibm.h"
  21
  22 #ifndef _DOUBLE_IS_32BITS
  23
  24 #ifdef __STDC__
  25         double copysign(double x, double y)
  26 #else
  27         double copysign(x,y)
  28         double x,y;
  29 #endif
  30 {
  31         uint32_t hx, hy;
  32         GET_HIGH_WORD(hx, x);
  33         GET_HIGH_WORD(hy, y);
  34         SET_HIGH_WORD(x, (hx&0x7fffffff)|(hy&0x80000000));
  35         return x;
  36 }
  37 #endif /* _DOUBLE_IS_32BITS */