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 */
38int
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