1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 David Schultz <das (at) FreeBSD.ORG> 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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: head/lib/msun/src/s_fmax.c 326219 2017-11-26 02:00:33Z pfg $"); 31 32 #include <float.h> 33 #include <math.h> 34 35 #include "fpmath.h" 36 37 double 38 fmax(double x, double y) 39 { 40 union IEEEd2bits u[2]; 41 42 u[0].d = x; 43 u[1].d = y; 44 45 /* Check for NaNs to avoid raising spurious exceptions. */ 46 if (u[0].bits.exp == 2047 && (u[0].bits.manh | u[0].bits.manl) != 0) 47 return (y); 48 if (u[1].bits.exp == 2047 && (u[1].bits.manh | u[1].bits.manl) != 0) 49 return (x); 50 51 /* Handle comparisons of signed zeroes. */ 52 if (u[0].bits.sign != u[1].bits.sign) 53 return (u[u[0].bits.sign].d); 54 55 return (x > y ? x : y); 56 } 57 58 #if (LDBL_MANT_DIG == 53) 59 __weak_reference(fmax, fmaxl); 60 #endif 61
