/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma weak __rintl = rintl
/*
* rintl(long double x) return x rounded to integral according to
* the prevailing rounding direction
*
* NOTE: aintl(x), anintl(x), ceill(x), floorl(x), and rintl(x) return result
* with the same sign as x's, including 0.0L.
*/
#include "libm.h"
#include "longdouble.h"
extern enum fp_precision_type __swapRP(enum fp_precision_type);
static const double one = 1.0;
static const long double qzero = 0.0L;
long double
rintl(long double x) {
enum fp_precision_type rp;
long double t, w, two112;
int *pt = (int *) &two112;
if (!finitel(x))
return (x + x);
if (*(int *) &one != 0) { /* set two112 = 2^112 */
pt[0] = 0x406f0000;
pt[1] = pt[2] = pt[3] = 0;
} else {
pt[3] = 0x406f0000;
pt[0] = pt[1] = pt[2] = 0;
}
if (fabsl(x) >= two112)
return (x); /* already an integer */
t = copysignl(two112, x);
rp = __swapRP(fp_extended); /* make sure precision is long double */
w = x + t; /* x+sign(x)*2^112 rounded to integer */
(void) __swapRP(rp); /* restore precision mode */
if (w == t)
return (copysignl(qzero, x)); /* x rounded to zero */
else
return (w - t);
}