1 /*- 2 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __RCSID("$NetBSD: s_fmaxl.c,v 1.4 2013/11/29 22:16:10 joerg Exp $"); 29 #ifdef notdef 30 __FBSDID("$FreeBSD: src/lib/msun/src/s_fmaxl.c,v 1.1 2004/06/30 07:04:01 das Exp $"); 31 #endif 32 33 #include <string.h> 34 #include <math.h> 35 36 #include <machine/ieee.h> 37 #ifdef __HAVE_LONG_DOUBLE 38 long double 39 fmaxl(long double x, long double y) 40 { 41 union ieee_ext_u u[2]; 42 43 memset(&u, 0, sizeof u); 44 u[0].extu_ld = x; 45 u[0].extu_ext.ext_frach &= ~0x80000000; 46 u[1].extu_ld = y; 47 u[1].extu_ext.ext_frach &= ~0x80000000; 48 49 /* Check for NaNs to avoid raising spurious exceptions. */ 50 if (u[0].extu_ext.ext_exp == EXT_EXP_INFNAN && 51 (u[0].extu_ext.ext_frach | u[0].extu_ext.ext_fracl) != 0) 52 return (y); 53 if (u[1].extu_ext.ext_exp == EXT_EXP_INFNAN && 54 (u[1].extu_ext.ext_frach | u[1].extu_ext.ext_fracl) != 0) 55 return (x); 56 57 /* Handle comparisons of ext_signed zeroes. */ 58 if (u[0].extu_ext.ext_sign != u[1].extu_ext.ext_sign) 59 return (u[0].extu_ext.ext_sign ? y : x); 60 61 return (x > y ? x : y); 62 } 63 #endif 64