cosmopolitan/libc/tinymath/fmin.c

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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi
Copyright 2020 Justine Alexandra Roberts Tunney
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "libc/tinymath/tinymath.h"
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/**
* Returns minimum of two doubles.
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*
* If one argument is NAN then the other is returned.
* This function is designed to do the right thing with
* signed zeroes.
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*/
double fmin(double x, double y) {
if (__builtin_isnan(x)) return y;
if (__builtin_isnan(y)) return x;
if (__builtin_signbit(x) != __builtin_signbit(y)) {
return __builtin_signbit(x) ? x : y; /* C99 Annex F.9.9.2 */
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}
return x < y ? x : y;
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}