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
31 /*
32 * _Qp_dtoq(pz, x) sets *pz = (long double)x.
33 */
34 void
_Qp_dtoq(union longdouble * pz,double x)35 _Qp_dtoq(union longdouble *pz, double x)
36
37 #else
38
39 /*
40 * _Q_dtoq(x) returns (long double)x.
41 */
42 union longdouble
43 _Q_dtoq(double x)
44
45 #endif /* __sparcv9 */
46
47 {
48 #ifndef __sparcv9
49 union longdouble z;
50 #endif
51 union xdouble u;
52 unsigned int m, lhi, llo, fsr;
53
54 /* extract the exponent */
55 u.d = x;
56 m = ((u.l.hi & 0x7ff00000) >> 4) + 0x3c000000;
57 if (m == 0x3c000000) {
58 /* x is zero or denormal */
59 if ((u.l.hi & 0xfffff) | u.l.lo) {
60 /* x is denormal, normalize it */
61 m = 0x3c010000;
62 lhi = u.l.hi & 0xfffff;
63 llo = u.l.lo;
64 do {
65 lhi = (lhi << 1) | (llo >> 31);
66 llo <<= 1;
67 m -= 0x10000;
68 } while ((lhi & 0x7ff00000) == 0);
69 u.l.hi = (u.l.hi & 0x80000000) | lhi;
70 u.l.lo = llo;
71 } else {
72 m = 0;
73 }
74 } else if (m == 0x43ff0000) {
75 /* x is inf or nan */
76 m = 0x7fff0000;
77 if (((u.l.hi & 0x7ffff) | u.l.lo) && (u.l.hi & 0x80000) == 0) {
78 /* snan, signal invalid */
79 __quad_getfsrp(&fsr);
80 if (fsr & FSR_NVM) {
81 __quad_fdtoq(&x, &Z);
82 QUAD_RETURN(Z);
83 } else {
84 fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
85 __quad_setfsrp(&fsr);
86 }
87 u.l.hi |= 0x80000;
88 }
89 }
90 Z.l.msw = m | (u.l.hi & 0x80000000) | ((u.l.hi & 0xffff0) >> 4);
91 Z.l.frac2 = (u.l.hi << 28) | (u.l.lo >> 4);
92 Z.l.frac3 = u.l.lo << 28;
93 Z.l.frac4 = 0;
94 QUAD_RETURN(Z);
95 }
96