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File: [cvs.NetBSD.org] / src / lib / libm / src / s_fmaxf.c (download)

Revision 1.2.2.2, Fri Mar 12 21:58:42 2010 UTC (14 years ago) by riz
Branch: netbsd-5
CVS Tags: netbsd-5-2-RELEASE, netbsd-5-2-RC1, netbsd-5-2-3-RELEASE, netbsd-5-2-2-RELEASE, netbsd-5-2-1-RELEASE, netbsd-5-2, netbsd-5-1-RELEASE, netbsd-5-1-RC4, netbsd-5-1-RC3, netbsd-5-1-RC2, netbsd-5-1-RC1, netbsd-5-1-5-RELEASE, netbsd-5-1-4-RELEASE, netbsd-5-1-3-RELEASE, netbsd-5-1-2-RELEASE, netbsd-5-1-1-RELEASE, netbsd-5-1, matt-nb5-pq3-base, matt-nb5-pq3
Changes since 1.2.2.1: +58 -0 lines

Pull up following revision(s) (requested by snj in ticket #1330):
	lib/libm/man/fmax.3: revision 1.1-1.2
	lib/libm/src/s_fmin.c: revision 1.1-1.2
	lib/libm/src/s_fdim.c: revision 1.1
	lib/libm/src/s_fmaxl.c: revision 1.1
	lib/libm/Makefile: revision 1.90
	include/math.h: revision 1.49
	lib/libm/src/s_fmaxf.c: revision 1.1
	lib/libm/src/s_fmax.c: revision 1.1
	lib/libm/shlib_version: revision 1.10
	distrib/sets/lists/base/md.sparc64: revision 1.63 (via patch)
	distrib/sets/lists/base/shl.mi: revision 1.495 (via patch)
	lib/libm/src/s_fminl.c: revision 1.1
	distrib/sets/lists/comp/mi: revision 1.1317
	lib/libm/man/fdim.3: revision 1.1-1.3
	lib/libm/src/s_fminf.c: revision 1.1
	distrib/sets/lists/base/md.amd64: revision 1.70 (via patch)
add f{min,max,dim}{,l,f} from FreeBSD
These functions are going to first appear in 5.1, not 6.0.

/*-
 * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
 * 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 <sys/cdefs.h>
__RCSID("NetBSD$");
#ifdef notdef
__FBSDID("$FreeBSD: src/lib/msun/src/s_fmaxf.c,v 1.1 2004/06/30 07:04:01 das Exp $");
#endif

#include <math.h>

#include <machine/ieee.h>

float
fmaxf(float x, float y)
{
	union ieee_single_u u[2];

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

	/* Check for NaNs to avoid raising spurious exceptions. */
	if (u[0].sngu_sng.sng_exp == SNG_EXP_INFNAN &&
	    u[0].sngu_sng.sng_frac != 0)
		return (y);
	if (u[1].sngu_sng.sng_exp == SNG_EXP_INFNAN &&
	    u[1].sngu_sng.sng_frac != 0)
		return (x);

	/* Handle comparisons of sng_signed zeroes. */
	if (u[0].sngu_sng.sng_sign != u[1].sngu_sng.sng_sign)
		return (u[u[0].sngu_sng.sng_sign].sngu_f);

	return (x > y ? x : y);
}