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_itoq(pz, x) sets *pz = (long double)x.
35 */
36 void
_Qp_itoq(union longdouble * pz,int x)37 _Qp_itoq(union longdouble *pz, int x)
38
39 #else
40
41 /*
42 * _Q_itoq(x) returns (long double)x.
43 */
44 union longdouble
45 _Q_itoq(int x)
46
47 #endif /* __sparcv9 */
48
49 {
50 #ifndef __sparcv9
51 union longdouble z;
52 #endif
53 unsigned int s, e;
54
55 /* extract the sign */
56 s = 0;
57 if (x < 0) {
58 if ((unsigned) x == 0x80000000) {
59 /* largest negative int */
60 Z.l.msw = 0xc01e0000;
61 Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0;
62 QUAD_RETURN(Z);
63 }
64 x = -x;
65 s = 0x80000000;
66 } else if (x == 0) {
67 Z.l.msw = Z.l.frac2 = Z.l.frac3 = Z.l.frac4 = 0;
68 QUAD_RETURN(Z);
69 }
70
71 /* find the most significant bit */
72 for (e = 30; (x & (1 << e)) == 0; e--)
73 ;
74
75 if (e > 16) {
76 Z.l.msw = ((unsigned) x >> (e - 16)) & 0xffff;
77 Z.l.frac2 = (unsigned) x << (48 - e);
78 } else {
79 Z.l.msw = ((unsigned) x << (16 - e)) & 0xffff;
80 Z.l.frac2 = 0;
81 }
82 Z.l.frac3 = Z.l.frac4 = 0;
83 Z.l.msw |= s | ((e + 0x3fff) << 16);
84 QUAD_RETURN(Z);
85 }
86