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 #ifdef USE_BUILTIN_FMINIMUM_NUMF
36 float
fminimum_numf(float x,float y)37 fminimum_numf(float x, float y)
38 {
39 return (__builtin_fminimum_numf(x, y));
40 }
41 #else
42 float
fminimum_numf(float x,float y)43 fminimum_numf(float x, float y)
44 {
45 union IEEEf2bits u[2];
46 bool nan_x, nan_y;
47
48 u[0].f = x;
49 u[1].f = y;
50
51 nan_x = u[0].bits.exp == 255 && u[0].bits.man != 0;
52 nan_y = u[1].bits.exp == 255 && u[1].bits.man != 0;
53
54 if (nan_x || nan_y) {
55 /* These ternary conditionals force (x+y), so that sNaN's raise exceptions */
56 if (nan_x && nan_y)
57 return (x + y);
58 if (nan_x)
59 return ((x + y) != 0.0 ? y : y);
60 return ((x + y) != 0.0 ? x : x);
61 }
62
63 /* Handle comparisons of signed zeroes. */
64 if (u[0].bits.sign != u[1].bits.sign)
65 return (u[u[1].bits.sign].f);
66
67 return (x < y ? x : y);
68 }
69 #endif
70
71
72