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 __FBSDID("$FreeBSD$"); 31 32 #include <float.h> 33 #include <math.h> 34 35 #include "fpmath.h" 36 37 #ifdef USE_BUILTIN_FMIN 38 double 39 fmin(double x, double y) 40 { 41 return (__builtin_fmin(x, y)); 42 } 43 #else 44 double 45 fmin(double x, double y) 46 { 47 union IEEEd2bits u[2]; 48 49 u[0].d = x; 50 u[1].d = y; 51 52 /* Check for NaNs to avoid raising spurious exceptions. */ 53 if (u[0].bits.exp == 2047 && (u[0].bits.manh | u[0].bits.manl) != 0) 54 return (y); 55 if (u[1].bits.exp == 2047 && (u[1].bits.manh | u[1].bits.manl) != 0) 56 return (x); 57 58 /* Handle comparisons of signed zeroes. */ 59 if (u[0].bits.sign != u[1].bits.sign) 60 return (u[u[1].bits.sign].d); 61 62 return (x < y ? x : y); 63 } 64 #endif 65 66 #if (LDBL_MANT_DIG == 53) 67 __weak_reference(fmin, fminl); 68 #endif 69