1*4e30c129SJesús Blázquez /*
2*4e30c129SJesús Blázquez * SPDX-License-Identifier: BSD-2-Clause
3*4e30c129SJesús Blázquez *
4*4e30c129SJesús Blázquez * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
5*4e30c129SJesús Blázquez * Copyright (c) 2026 Jesús Blázquez <jesuscblazquez@gmail.com>
6*4e30c129SJesús Blázquez * All rights reserved.
7*4e30c129SJesús Blázquez *
8*4e30c129SJesús Blázquez * Redistribution and use in source and binary forms, with or without
9*4e30c129SJesús Blázquez * modification, are permitted provided that the following conditions
10*4e30c129SJesús Blázquez * are met:
11*4e30c129SJesús Blázquez * 1. Redistributions of source code must retain the above copyright
12*4e30c129SJesús Blázquez * notice, this list of conditions and the following disclaimer.
13*4e30c129SJesús Blázquez * 2. Redistributions in binary form must reproduce the above copyright
14*4e30c129SJesús Blázquez * notice, this list of conditions and the following disclaimer in the
15*4e30c129SJesús Blázquez * documentation and/or other materials provided with the distribution.
16*4e30c129SJesús Blázquez *
17*4e30c129SJesús Blázquez * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18*4e30c129SJesús Blázquez * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*4e30c129SJesús Blázquez * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*4e30c129SJesús Blázquez * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21*4e30c129SJesús Blázquez * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*4e30c129SJesús Blázquez * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*4e30c129SJesús Blázquez * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*4e30c129SJesús Blázquez * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*4e30c129SJesús Blázquez * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*4e30c129SJesús Blázquez * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*4e30c129SJesús Blázquez * SUCH DAMAGE.
28*4e30c129SJesús Blázquez */
29*4e30c129SJesús Blázquez
30*4e30c129SJesús Blázquez #include <math.h>
31*4e30c129SJesús Blázquez #include <stdbool.h>
32*4e30c129SJesús Blázquez
33*4e30c129SJesús Blázquez #include "fpmath.h"
34*4e30c129SJesús Blázquez
35*4e30c129SJesús Blázquez #ifdef USE_BUILTIN_FMINIMUM_NUMF
36*4e30c129SJesús Blázquez float
fminimum_numf(float x,float y)37*4e30c129SJesús Blázquez fminimum_numf(float x, float y)
38*4e30c129SJesús Blázquez {
39*4e30c129SJesús Blázquez return (__builtin_fminimum_numf(x, y));
40*4e30c129SJesús Blázquez }
41*4e30c129SJesús Blázquez #else
42*4e30c129SJesús Blázquez float
fminimum_numf(float x,float y)43*4e30c129SJesús Blázquez fminimum_numf(float x, float y)
44*4e30c129SJesús Blázquez {
45*4e30c129SJesús Blázquez union IEEEf2bits u[2];
46*4e30c129SJesús Blázquez bool nan_x, nan_y;
47*4e30c129SJesús Blázquez
48*4e30c129SJesús Blázquez u[0].f = x;
49*4e30c129SJesús Blázquez u[1].f = y;
50*4e30c129SJesús Blázquez
51*4e30c129SJesús Blázquez nan_x = u[0].bits.exp == 255 && u[0].bits.man != 0;
52*4e30c129SJesús Blázquez nan_y = u[1].bits.exp == 255 && u[1].bits.man != 0;
53*4e30c129SJesús Blázquez
54*4e30c129SJesús Blázquez if (nan_x || nan_y) {
55*4e30c129SJesús Blázquez /* These ternary conditionals force (x+y), so that sNaN's raise exceptions */
56*4e30c129SJesús Blázquez if (nan_x && nan_y)
57*4e30c129SJesús Blázquez return (x + y);
58*4e30c129SJesús Blázquez if (nan_x)
59*4e30c129SJesús Blázquez return ((x + y) != 0.0 ? y : y);
60*4e30c129SJesús Blázquez return ((x + y) != 0.0 ? x : x);
61*4e30c129SJesús Blázquez }
62*4e30c129SJesús Blázquez
63*4e30c129SJesús Blázquez /* Handle comparisons of signed zeroes. */
64*4e30c129SJesús Blázquez if (u[0].bits.sign != u[1].bits.sign)
65*4e30c129SJesús Blázquez return (u[u[1].bits.sign].f);
66*4e30c129SJesús Blázquez
67*4e30c129SJesús Blázquez return (x < y ? x : y);
68*4e30c129SJesús Blázquez }
69*4e30c129SJesús Blázquez #endif
70*4e30c129SJesús Blázquez
71*4e30c129SJesús Blázquez
72