64 lines
2.3 KiB
C
64 lines
2.3 KiB
C
/*-
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* Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
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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 <sys/cdefs.h>
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__RCSID("$NetBSD: s_fmaxl.c,v 1.3 2011/07/04 11:46:41 mrg Exp $");
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#ifdef notdef
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__FBSDID("$FreeBSD: src/lib/msun/src/s_fmaxl.c,v 1.1 2004/06/30 07:04:01 das Exp $");
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#endif
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#include <string.h>
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#include <math.h>
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#include <machine/ieee.h>
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#ifdef EXT_EXP_INFNAN
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long double
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fmaxl(long double x, long double y)
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{
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union ieee_ext_u u[2];
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memset(&u, 0, sizeof u);
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u[0].extu_ld = x;
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u[0].extu_ext.ext_frach &= ~0x80000000;
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u[1].extu_ld = y;
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u[1].extu_ext.ext_frach &= ~0x80000000;
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/* Check for NaNs to avoid raising spurious exceptions. */
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if (u[0].extu_ext.ext_exp == EXT_EXP_INFNAN &&
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(u[0].extu_ext.ext_frach | u[0].extu_ext.ext_fracl) != 0)
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return (y);
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if (u[1].extu_ext.ext_exp == EXT_EXP_INFNAN &&
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(u[1].extu_ext.ext_frach | u[1].extu_ext.ext_fracl) != 0)
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return (x);
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/* Handle comparisons of ext_signed zeroes. */
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if (u[0].extu_ext.ext_sign != u[1].extu_ext.ext_sign)
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return (u[0].extu_ext.ext_sign ? y : x);
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return (x > y ? x : y);
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}
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#endif
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