1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004 David Schultz <das@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 #include <math.h> 31 32 #include "fpmath.h" 33 34 #ifdef USE_BUILTIN_FMAXF 35 float 36 fmaxf(float x, float y) 37 { 38 return (__builtin_fmaxf(x, y)); 39 } 40 #else 41 float 42 fmaxf(float x, float y) 43 { 44 union IEEEf2bits u[2]; 45 46 u[0].f = x; 47 u[1].f = y; 48 49 /* Check for NaNs to avoid raising spurious exceptions. */ 50 if (u[0].bits.exp == 255 && u[0].bits.man != 0) 51 return (y); 52 if (u[1].bits.exp == 255 && u[1].bits.man != 0) 53 return (x); 54 55 /* Handle comparisons of signed zeroes. */ 56 if (u[0].bits.sign != u[1].bits.sign) 57 return (u[u[0].bits.sign].f); 58 59 return (x > y ? x : y); 60 } 61 #endif 62