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