sysdeps/libm-ieee754/s_copysignf.c

   1 /* s_copysignf.c -- float version of s_copysign.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: s_copysignf.c,v 1.4 1995/05/10 20:46:59 jtc Exp $";
  18 #endif
  19
  20 /*
  21  * copysignf(float x, float y)
  22  * copysignf(x,y) returns a value with the magnitude of x and
  23  * with the sign bit of y.
  24  */
  25
  26 #include "math.h"
  27 #include "math_private.h"
  28
  29 #ifdef __STDC__
  30         float __copysignf(float x, float y)
  31 #else
  32         float __copysignf(x,y)
  33         float x,y;
  34 #endif
  35 {
  36         u_int32_t ix,iy;
  37         GET_FLOAT_WORD(ix,x);
  38         GET_FLOAT_WORD(iy,y);
  39         SET_FLOAT_WORD(x,(ix&0x7fffffff)|(iy&0x80000000));
  40         return x;
  41 }
  42 weak_alias (__copysignf, copysignf)