_Q_add.c revision 5d54f3d8999eac1762fe0a8c7177d20f1f201fae
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (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 1988 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include "_Qquad.h"
#include "_Qglobals.h"
static double zero = 0.0, tiny = 1.0e-300, huge = 1.0e300;
static void dummy(double);
QUAD
_Q_add(QUAD x, QUAD y)
{
unpacked px,py,pz;
QUAD z;
_fp_current_exceptions = 0;
_Q_get_rp_rd(); /* get fp_precision, fp_direction */
_fp_unpack(&px,(int *)&x,fp_op_extended);
_fp_unpack(&py,(int *)&y,fp_op_extended);
_fp_add(&px,&py,&pz);
_fp_pack(&pz,(int *)&z,fp_op_extended);
_Q_set_exception(_fp_current_exceptions);
return (z);
}
void
_Q_set_exception(unsigned ex)
{
/* simulate exceptions using double arithmetic */
double t;
if((ex&(1<<fp_invalid))!=0) t = (zero/zero);
if((ex&(1<<fp_overflow))!=0) t = (huge*huge);
if((ex&(1<<fp_underflow))!=0) t = (tiny*tiny);
if((ex&(1<<fp_division))!=0) t = (tiny/zero);
if((ex&(1<<fp_inexact))!=0) t = (huge+tiny);
dummy(t); /* prevent optimizer eliminating previous expression */
}
static void
dummy(double x)
{
}