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

Revision 1.3, Mon Feb 11 02:45:27 2013 UTC (20 months, 1 week ago) by christos
Branch: MAIN
CVS Tags: yamt-pagecache-base9, tls-maxphys-base, tls-earlyentropy-base, tls-earlyentropy, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3, riastradh-drm2-base2, riastradh-drm2-base1, riastradh-drm2-base, riastradh-drm2, netbsd-7-base, netbsd-7, agc-symver-base, agc-symver, HEAD
Branch point for: yamt-pagecache, tls-maxphys
Changes since 1.2: +3 -3 lines

use __HAVE_LONG_DOUBLE

/*	$NetBSD: s_nearbyint.c,v 1.3 2013/02/11 02:45:27 christos Exp $	*/

/*-
 * 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>
#if 0
__FBSDID("$FreeBSD: src/lib/msun/src/s_nearbyint.c,v 1.2 2008/01/14 02:12:06 das Exp $");
#else
__RCSID("$NetBSD: s_nearbyint.c,v 1.3 2013/02/11 02:45:27 christos Exp $");
#endif

#include <machine/ieee.h>
#include <fenv.h>
#include <math.h>

/*
 * We save and restore the floating-point environment to avoid raising
 * an inexact exception.  We can get away with using fesetenv()
 * instead of feclearexcept()/feupdateenv() to restore the environment
 * because the only exception defined for rint() is overflow, and
 * rounding can't overflow as long as emax >= p.
 */
#define	DECL(type, fn, rint)	\
type				\
fn(type x)			\
{				\
	type ret;		\
	fenv_t env;		\
				\
	fegetenv(&env);		\
	ret = rint(x);		\
	fesetenv(&env);		\
	return (ret);		\
}

DECL(double, nearbyint, rint)
DECL(float, nearbyintf, rintf)
#ifdef __HAVE_LONG_DOUBLE
DECL(long double, nearbyintl, rintl)
#endif