1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 1988 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "_Qquad.h"
30 #include "_Qglobals.h"
31
32 static double zero = 0.0, tiny = 1.0e-300, huge = 1.0e300;
33 static void dummy(double);
34
35 QUAD
_Q_add(QUAD x,QUAD y)36 _Q_add(QUAD x, QUAD y)
37 {
38 unpacked px,py,pz;
39 QUAD z;
40 _fp_current_exceptions = 0;
41 _Q_get_rp_rd(); /* get fp_precision, fp_direction */
42 _fp_unpack(&px,(int *)&x,fp_op_extended);
43 _fp_unpack(&py,(int *)&y,fp_op_extended);
44 _fp_add(&px,&py,&pz);
45 _fp_pack(&pz,(int *)&z,fp_op_extended);
46 _Q_set_exception(_fp_current_exceptions);
47 return (z);
48 }
49
50 void
_Q_set_exception(unsigned ex)51 _Q_set_exception(unsigned ex)
52 {
53 /* simulate exceptions using double arithmetic */
54 double t;
55 if((ex&(1<<fp_invalid))!=0) t = (zero/zero);
56 if((ex&(1<<fp_overflow))!=0) t = (huge*huge);
57 if((ex&(1<<fp_underflow))!=0) t = (tiny*tiny);
58 if((ex&(1<<fp_division))!=0) t = (tiny/zero);
59 if((ex&(1<<fp_inexact))!=0) t = (huge+tiny);
60 dummy(t); /* prevent optimizer eliminating previous expression */
61 }
62
63 static void
dummy(double x)64 dummy(double x)
65 {
66 }
67