1 /* 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 5 * Copyright (c) 2026 Jesús Blázquez <jesuscblazquez@gmail.com> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <math.h> 31 #include <stdbool.h> 32 33 #include "fpmath.h" 34 35 long double 36 fminimum_numl(long double x, long double y) 37 { 38 union IEEEl2bits u[2]; 39 bool nan_x, nan_y; 40 41 u[0].e = x; 42 mask_nbit_l(u[0]); 43 u[1].e = y; 44 mask_nbit_l(u[1]); 45 46 nan_x = isnan(x); 47 nan_y = isnan(y); 48 49 if (nan_x || nan_y) { 50 /* If both are NaN, adding returns qNaN */ 51 if (nan_x && nan_y) 52 return (x + y); 53 54 /* force_except makes sure sNaN's raise exceptions */ 55 volatile long double force_except = x + y; 56 force_except; 57 58 if (nan_x) 59 return (y); 60 else 61 return (x); 62 } 63 64 /* Handle comparisons of signed zeroes. */ 65 if (u[0].bits.sign != u[1].bits.sign) 66 return (u[1].bits.sign ? y : x); 67 68 return (x < y ? x : y); 69 } 70 71 72