/*
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
 * Copyright (c) 2026 Jesús Blázquez <jesuscblazquez@gmail.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <math.h>
#include <stdbool.h>

#include "fpmath.h"

#ifdef USE_BUILTIN_FMINIMUM_NUMF
float
fminimum_numf(float x, float y)
{
        return (__builtin_fminimum_numf(x, y));
}
#else
float
fminimum_numf(float x, float y)
{
        union IEEEf2bits u[2];
        bool nan_x, nan_y;

        u[0].f = x;
        u[1].f = y;

        nan_x = u[0].bits.exp == 255 && u[0].bits.man != 0;
        nan_y = u[1].bits.exp == 255 && u[1].bits.man != 0;

        if (nan_x || nan_y) {
                /* These ternary conditionals force (x+y), so that sNaN's raise exceptions */
                if (nan_x && nan_y)
                        return (x + y);
                if (nan_x)
                        return ((x + y) != 0.0 ? y : y);
                return ((x + y) != 0.0 ? x : x);
        }

        /* Handle comparisons of signed zeroes. */
        if (u[0].bits.sign != u[1].bits.sign)
                return (u[u[1].bits.sign].f);

        return (x < y ? x : y);
}
#endif