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 (c) 1994-1997, by Sun Microsystems, Inc.
24 * All rights reserved.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 #include "quad.h"
30
31 #ifdef __sparcv9
32 #define _Q_qtoi _Qp_qtoi
33 #endif
34
35 /*
36 * _Q_qtoi(x) returns (int)*x.
37 */
38 int
_Q_qtoi(const union longdouble * x)39 _Q_qtoi(const union longdouble *x)
40 {
41 unsigned int xm, fsr;
42 int i, round;
43
44 xm = x->l.msw & 0x7fffffff;
45
46 __quad_getfsrp(&fsr);
47
48 /* handle nan, inf, and out-of-range cases */
49 if (xm >= 0x401e0000) {
50 if (x->l.msw == 0xc01e0000 && (x->l.frac2 & 0xfffe0000) == 0) {
51 /* return largest negative int */
52 i = 0x80000000;
53 if ((x->l.frac2 & 0x1ffff) | x->l.frac3 | x->l.frac4) {
54 /* signal inexact */
55 if (fsr & FSR_NXM) {
56 __quad_fqtoi(x, &i);
57 } else {
58 fsr = (fsr & ~FSR_CEXC) | FSR_NXA |
59 FSR_NXC;
60 __quad_setfsrp(&fsr);
61 }
62 }
63 return (i);
64 }
65 i = ((x->l.msw & 0x80000000)? 0x80000000 : 0x7fffffff);
66 if (fsr & FSR_NVM) {
67 __quad_fqtoi(x, &i);
68 } else {
69 fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
70 __quad_setfsrp(&fsr);
71 }
72 return (i);
73 }
74 if (xm < 0x3fff0000) {
75 i = 0;
76 if (xm | x->l.frac2 | x->l.frac3 | x->l.frac4) {
77 /* signal inexact */
78 if (fsr & FSR_NXM) {
79 __quad_fqtoi(x, &i);
80 } else {
81 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
82 __quad_setfsrp(&fsr);
83 }
84 }
85 return (i);
86 }
87
88 /* now x is in the range of int */
89 i = (int) (0x40000000 | ((xm & 0xffff) << 14) | (x->l.frac2 >> 18));
90 round = i & ((1 << (0x401d - (xm >> 16))) - 1);
91 i >>= (0x401d - (xm >> 16));
92 if (x->l.msw & 0x80000000)
93 i = -i;
94 if (round | (x->l.frac2 & 0x3ffff) | x->l.frac3 | x->l.frac4) {
95 /* signal inexact */
96 if (fsr & FSR_NXM) {
97 __quad_fqtoi(x, &i);
98 } else {
99 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
100 __quad_setfsrp(&fsr);
101 }
102 }
103 return (i);
104 }
105