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 47long double 48copysignl(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) 60long double 61copysignl(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