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      1 /*	$NetBSD: s_copysignl.c,v 1.6 2019/02/04 04:37:50 mrg 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 1.6 2019/02/04 04:37:50 mrg Exp $");
     30 #include "namespace.h"
     31 
     32 #include <math.h>
     33 #include <machine/ieee.h>
     34 #include <string.h>
     35 
     36 #if defined(__HAVE_LONG_DOUBLE) || defined(__HAVE_IBM_LONGDOUBLE)
     37 
     38 #ifdef __weak_alias
     39 __weak_alias(copysignl, _copysignl)
     40 #endif
     41 
     42 /*
     43  * copysignl(long double x, long double y)
     44  * This function returns a value with the magnitude of x and the sign of y.
     45  */
     46 #ifdef EXT_EXP_INFNAN
     47 long double
     48 copysignl(long double x, long double y)
     49 {
     50 	union ieee_ext_u ux, uy;
     51 
     52 	ux.extu_ld = x;
     53 	uy.extu_ld = y;
     54 
     55 	ux.extu_ext.ext_sign = uy.extu_ext.ext_sign;
     56 
     57 	return (ux.extu_ld);
     58 }
     59 #elif defined(__HAVE_IBM_LONGDOUBLE)
     60 long double
     61 copysignl(long double x, long double y)
     62 {
     63 	union ldbl_u ux, uy;
     64 
     65 	memset(&ux, 0, sizeof ux);
     66 	memset(&uy, 0, sizeof uy);
     67 	ux.ldblu_ld = x;
     68 	uy.ldblu_ld = y;
     69 	ux.ldblu_d[0] = copysign(ux.ldblu_d[0], uy.ldblu_d[0]);
     70 	ux.ldblu_d[1] = copysign(ux.ldblu_d[1], uy.ldblu_d[1]);
     71 
     72 	return ux.ldblu_ld;
     73 }
     74 #endif
     75 #endif /* __HAVE_LONG_DOUBLE || __HAVE_IBM_LONGDOUBLE */
     76