lib/libm/src/s_copysignl.c

   1 /*      $NetBSD: s_copysignl.c,v 1.5 2015/05/14 19:26:12 joerg 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 1.5 2015/05/14 19:26:12 joerg Exp $");
  30 #include "namespace.h"
  31
  32 #include <math.h>
  33 #include <machine/ieee.h>
  34
  35 #if defined(__HAVE_LONG_DOUBLE) || defined(__HAVE_IBM_LONGDOUBLE)
  36
  37 #ifdef __weak_alias
  38 __weak_alias(copysignl, _copysignl)
  39 #endif
  40
  41 /*
  42  * copysignl(long double x, long double y)
  43  * This function returns a value with the magnitude of x and the sign of y.
  44  */
  45 #ifdef EXT_EXP_INFNAN
  46 long double
  47 copysignl(long double x, long double y)
  48 {
  49         union ieee_ext_u ux, uy;
  50
  51         ux.extu_ld = x;
  52         uy.extu_ld = y;
  53
  54         ux.extu_ext.ext_sign = uy.extu_ext.ext_sign;
  55
  56         return (ux.extu_ld);
  57 }
  58 #elif defined(__HAVE_IBM_LONGDOUBLE)
  59 long double
  60 copysignl(long double x, long double y)
  61 {
  62         union ldbl_u ux, uy;
  63
  64         ux.ldblu_ld = x;
  65         uy.ldblu_ld = y;
  66         ux.ldblu_d[0] = copysign(ux.ldblu_d[0], uy.ldblu_d[0]);
  67         ux.ldblu_d[1] = copysign(ux.ldblu_d[1], uy.ldblu_d[1]);
  68
  69         return ux.ldblu_ld;
  70 }
  71 #endif
  72 #endif /* __HAVE_LONG_DOUBLE || __HAVE_IBM_LONGDOUBLE */