Jesús Blázquez
4e30c12973
Added support for the f{maximum,minimum}_{mag,num} families, the new
C23 standard functions for maximum magnitude and number-preferring
maximum. This includes modifying fmax.3, on top of D56230, to
recommend the use of fmaximum_num and fminimum_num.
Reviewed by: fuz, kargl
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D56236
72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/*
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
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* Copyright (c) 2026 Jesús Blázquez <jesuscblazquez@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <math.h>
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#include <stdbool.h>
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#include "fpmath.h"
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#ifdef USE_BUILTIN_FMINIMUM_NUMF
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float
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fminimum_numf(float x, float y)
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{
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return (__builtin_fminimum_numf(x, y));
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}
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#else
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float
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fminimum_numf(float x, float y)
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{
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union IEEEf2bits u[2];
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bool nan_x, nan_y;
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u[0].f = x;
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u[1].f = y;
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nan_x = u[0].bits.exp == 255 && u[0].bits.man != 0;
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nan_y = u[1].bits.exp == 255 && u[1].bits.man != 0;
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if (nan_x || nan_y) {
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/* These ternary conditionals force (x+y), so that sNaN's raise exceptions */
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if (nan_x && nan_y)
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return (x + y);
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if (nan_x)
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return ((x + y) != 0.0 ? y : y);
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return ((x + y) != 0.0 ? x : x);
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}
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/* Handle comparisons of signed zeroes. */
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if (u[0].bits.sign != u[1].bits.sign)
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return (u[u[1].bits.sign].f);
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return (x < y ? x : y);
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}
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#endif
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