14f82cb46SDavid Schultz /*- 25e53a4f9SPedro F. Giffuni * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 35e53a4f9SPedro F. Giffuni * 44f82cb46SDavid Schultz * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 54f82cb46SDavid Schultz * All rights reserved. 64f82cb46SDavid Schultz * 74f82cb46SDavid Schultz * Redistribution and use in source and binary forms, with or without 84f82cb46SDavid Schultz * modification, are permitted provided that the following conditions 94f82cb46SDavid Schultz * are met: 104f82cb46SDavid Schultz * 1. Redistributions of source code must retain the above copyright 114f82cb46SDavid Schultz * notice, this list of conditions and the following disclaimer. 124f82cb46SDavid Schultz * 2. Redistributions in binary form must reproduce the above copyright 134f82cb46SDavid Schultz * notice, this list of conditions and the following disclaimer in the 144f82cb46SDavid Schultz * documentation and/or other materials provided with the distribution. 154f82cb46SDavid Schultz * 164f82cb46SDavid Schultz * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 174f82cb46SDavid Schultz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 184f82cb46SDavid Schultz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 194f82cb46SDavid Schultz * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 204f82cb46SDavid Schultz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 214f82cb46SDavid Schultz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 224f82cb46SDavid Schultz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 234f82cb46SDavid Schultz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 244f82cb46SDavid Schultz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 254f82cb46SDavid Schultz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 264f82cb46SDavid Schultz * SUCH DAMAGE. 274f82cb46SDavid Schultz */ 284f82cb46SDavid Schultz 294f82cb46SDavid Schultz #include <sys/cdefs.h> 304f82cb46SDavid Schultz __FBSDID("$FreeBSD$"); 314f82cb46SDavid Schultz 32fae95359SRuslan Bukin #include <float.h> 334f82cb46SDavid Schultz #include <math.h> 344f82cb46SDavid Schultz 354f82cb46SDavid Schultz #include "fpmath.h" 364f82cb46SDavid Schultz 37*b2e84316SAndrew Turner #ifdef USE_BUILTIN_FMAX 38*b2e84316SAndrew Turner double 39*b2e84316SAndrew Turner fmax(double x, double y) 40*b2e84316SAndrew Turner { 41*b2e84316SAndrew Turner return (__builtin_fmax(x, y)); 42*b2e84316SAndrew Turner } 43*b2e84316SAndrew Turner #else 444f82cb46SDavid Schultz double 454f82cb46SDavid Schultz fmax(double x, double y) 464f82cb46SDavid Schultz { 474f82cb46SDavid Schultz union IEEEd2bits u[2]; 484f82cb46SDavid Schultz 494f82cb46SDavid Schultz u[0].d = x; 504f82cb46SDavid Schultz u[1].d = y; 514f82cb46SDavid Schultz 524f82cb46SDavid Schultz /* Check for NaNs to avoid raising spurious exceptions. */ 534f82cb46SDavid Schultz if (u[0].bits.exp == 2047 && (u[0].bits.manh | u[0].bits.manl) != 0) 544f82cb46SDavid Schultz return (y); 554f82cb46SDavid Schultz if (u[1].bits.exp == 2047 && (u[1].bits.manh | u[1].bits.manl) != 0) 564f82cb46SDavid Schultz return (x); 574f82cb46SDavid Schultz 584f82cb46SDavid Schultz /* Handle comparisons of signed zeroes. */ 594f82cb46SDavid Schultz if (u[0].bits.sign != u[1].bits.sign) 604f82cb46SDavid Schultz return (u[u[0].bits.sign].d); 614f82cb46SDavid Schultz 624f82cb46SDavid Schultz return (x > y ? x : y); 634f82cb46SDavid Schultz } 64*b2e84316SAndrew Turner #endif 65fae95359SRuslan Bukin 66fae95359SRuslan Bukin #if (LDBL_MANT_DIG == 53) 67fae95359SRuslan Bukin __weak_reference(fmax, fmaxl); 68fae95359SRuslan Bukin #endif 69