_Q_set_except.c revision 7257d1b4d25bfac0c802847390e98a464fd787ac
/*
* 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 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "lint.h"
#include <sys/ieeefp.h>
#include <ieeefp.h>
static const double zero = 0.0, tiny = 1.0e-307, tiny2 = 1.001e-307,
huge = 1.0e300;
/*
* _Q_set_exception(ex) simulates the floating point exceptions indicated by
* ex. This routine is not used by the new quad emulation routines but is
* still used by ../crt/_ftoll.c.
*/
int
_Q_set_exception(unsigned int ex)
{
/* LINTED set but not used */
volatile double t;
if (ex == 0)
t = zero - zero; /* clear cexc */
else {
if ((ex & (1 << fp_invalid)) != 0)
t = zero / zero;
if ((ex & (1 << fp_overflow)) != 0)
t = huge * huge;
if ((ex & (1 << fp_underflow)) != 0) {
if ((ex & (1 << fp_inexact)) != 0 ||
(fpgetmask() & FP_X_UFL) != 0)
t = tiny * tiny;
else
t = tiny2 - tiny; /* exact */
}
if ((ex & (1 << fp_division)) != 0)
t = tiny / zero;
if ((ex & (1 << fp_inexact)) != 0)
t = huge + tiny;
}
return (0);
}