lib/libm/src/s_copysignl.c

   1 /*      $NetBSD: s_copysignl.c,v 1.2 2010/09/17 20:39:39 christos Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28 #include <sys/cdefs.h>
  29 __RCSID("$NetBSD: s_copysignl.c,v 1.2 2010/09/17 20:39:39 christos Exp $");
  30
  31 #include <math.h>
  32 #include <machine/ieee.h>
  33
  34 /*
  35  * copysignl(long double x, long double y)
  36  * This function returns a value with the magnitude of x and the sign of y.
  37  */
  38 #ifdef EXT_EXP_INFNAN
  39 long double
  40 copysignl(long double x, long double y)
  41 {
  42         union ieee_ext_u ux, uy;
  43
  44         ux.extu_ld = x;
  45         uy.extu_ld = y;
  46
  47         ux.extu_ext.ext_sign = uy.extu_ext.ext_sign;
  48
  49         return (ux.extu_ld);
  50 }
  51 #endif