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
33/*
34 * _Qp_stoq(pz, x) sets *pz = (long double)x.
35 */
36void
37_Qp_stoq(union longdouble *pz, float x)
38
39#else
40
41/*
42 * _Qp_stoq(x) returns (long double)x.
43 */
44union longdouble
45_Q_stoq(float x)
46
47#endif /* __sparcv9 */
48
49{
50#ifndef __sparcv9
51	union longdouble	z;
52#endif
53	union {
54		float		f;
55		unsigned int	l;
56	} u;
57	unsigned int		m, f, fsr;
58
59	/* extract the exponent */
60	u.f = x;
61	m = ((u.l & 0x7f800000) >> 7) + 0x3f800000;
62	if (m == 0x3f800000) {
63		/* x is zero or denormal */
64		if (u.l & 0x7fffff) {
65			/* x is denormal, normalize it */
66			m = 0x3f810000;
67			f = u.l & 0x7fffff;
68			do {
69				f <<= 1;
70				m -= 0x10000;
71			} while ((f & 0x7f800000) == 0);
72			u.l = (u.l & 0x80000000) | f;
73		} else {
74			m = 0;
75		}
76	} else if (m == 0x407f0000) {
77		/* x is inf or nan */
78		m = 0x7fff0000;
79		if ((u.l & 0x3fffff) && (u.l & 0x400000) == 0) {
80			/* snan, signal invalid */
81			__quad_getfsrp(&fsr);
82			if (fsr & FSR_NVM) {
83				__quad_fstoq(&x, &Z);
84				QUAD_RETURN(Z);
85			} else {
86				fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
87				__quad_setfsrp(&fsr);
88			}
89			u.l |= 0x400000;
90		}
91	}
92	Z.l.msw = m | (u.l & 0x80000000) | ((u.l & 0x7fff80) >> 7);
93	Z.l.frac2 = u.l << 25;
94	Z.l.frac3 = Z.l.frac4 = 0;
95	QUAD_RETURN(Z);
96}
97