lib/libm/src/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 #include <sys/cdefs.h>
  17 #if defined(LIBM_SCCS) && !defined(lint)
  18 __RCSID("$NetBSD: s_copysignf.c,v 1.7 2002/05/26 22:01:54 wiz Exp $");
  19 #endif
  20
  21 /*
  22  * copysignf(float x, float y)
  23  * copysignf(x,y) returns a value with the magnitude of x and
  24  * with the sign bit of y.
  25  */
  26
  27 #include "math.h"
  28 #include "math_private.h"
  29
  30 float
  31 copysignf(float x, float y)
  32 {
  33         u_int32_t ix,iy;
  34         GET_FLOAT_WORD(ix,x);
  35         GET_FLOAT_WORD(iy,y);
  36         SET_FLOAT_WORD(x,(ix&0x7fffffff)|(iy&0x80000000));
  37         return x;
  38 }