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_qtou _Qp_qtoui
33 #endif
34
35 /*
36 * _Q_qtou(x) returns (unsigned int)*x.
37 */
38 unsigned
_Q_qtou(const union longdouble * x)39 _Q_qtou(const union longdouble *x)
40 {
41 union longdouble z;
42 unsigned int xm, fsr;
43 int i, round;
44
45 xm = x->l.msw & 0x7fffffff;
46
47 __quad_getfsrp(&fsr);
48
49 /* handle nan, inf, and out-of-range cases */
50 if (xm >= 0x401e0000) {
51 if (x->l.msw < 0x401f0000) {
52 i = 0x80000000 | ((xm & 0xffff) << 15) |
53 (x->l.frac2 >> 17);
54 if ((x->l.frac2 & 0x1ffff) | x->l.frac3 | x->l.frac4) {
55 /* signal inexact */
56 if (fsr & FSR_NXM) {
57 /* z = x - 2^31 */
58 if (xm & 0xffff ||
59 x->l.frac2 & 0xffff0000) {
60 z.l.msw = xm & 0xffff;
61 z.l.frac2 = x->l.frac2;
62 z.l.frac3 = x->l.frac3;
63 z.l.frac4 = x->l.frac4;
64 } else if (x->l.frac2 & 0xffff ||
65 x->l.frac3 & 0xffff0000) {
66 z.l.msw = x->l.frac2;
67 z.l.frac2 = x->l.frac3;
68 z.l.frac3 = x->l.frac4;
69 z.l.frac4 = 0;
70 } else if (x->l.frac3 & 0xffff ||
71 x->l.frac4 & 0xffff0000) {
72 z.l.msw = x->l.frac3;
73 z.l.frac2 = x->l.frac4;
74 z.l.frac3 = z.l.frac4 = 0;
75 } else {
76 z.l.msw = x->l.frac4;
77 z.l.frac2 = z.l.frac3 =
78 z.l.frac4 = 0;
79 }
80 xm = 0x401e;
81 while ((z.l.msw & 0x10000) == 0) {
82 z.l.msw = (z.l.msw << 1) |
83 (z.l.frac2 >> 31);
84 z.l.frac2 = (z.l.frac2 << 1) |
85 (z.l.frac3 >> 31);
86 z.l.frac3 = (z.l.frac3 << 1) |
87 (z.l.frac4 >> 31);
88 z.l.frac4 <<= 1;
89 xm--;
90 }
91 z.l.msw |= (xm << 16);
92 __quad_fqtoi(&z, &i);
93 i |= 0x80000000;
94 } else {
95 fsr = (fsr & ~FSR_CEXC) | FSR_NXA |
96 FSR_NXC;
97 __quad_setfsrp(&fsr);
98 }
99 }
100 return (i);
101 }
102 if (x->l.msw == 0xc01e0000 && (x->l.frac2 & 0xfffe0000) == 0) {
103 /* return largest negative int */
104 i = 0x80000000;
105 if ((x->l.frac2 & 0x1ffff) | x->l.frac3 | x->l.frac4) {
106 /* signal inexact */
107 if (fsr & FSR_NXM) {
108 __quad_fqtoi(x, &i);
109 } else {
110 fsr = (fsr & ~FSR_CEXC) | FSR_NXA |
111 FSR_NXC;
112 __quad_setfsrp(&fsr);
113 }
114 }
115 return (i);
116 }
117 i = ((x->l.msw & 0x80000000)? 0x80000000 : 0x7fffffff);
118 if (fsr & FSR_NVM) {
119 __quad_fqtoi(x, &i);
120 } else {
121 fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
122 __quad_setfsrp(&fsr);
123 }
124 return (i);
125 }
126 if (xm < 0x3fff0000) {
127 if (xm | x->l.frac2 | x->l.frac3 | x->l.frac4) {
128 /* signal inexact */
129 i = 0;
130 if (fsr & FSR_NXM) {
131 __quad_fqtoi(x, &i);
132 } else {
133 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
134 __quad_setfsrp(&fsr);
135 }
136 return (i);
137 }
138 return (0);
139 }
140
141 /* now x is in the range of int */
142 i = 0x40000000 | ((xm & 0xffff) << 14) | (x->l.frac2 >> 18);
143 round = i & ((1 << (0x401d - (xm >> 16))) - 1);
144 i >>= (0x401d - (xm >> 16));
145 if (x->l.msw & 0x80000000)
146 i = -i;
147 if (round | (x->l.frac2 & 0x3ffff) | x->l.frac3 | x->l.frac4) {
148 /* signal inexact */
149 if (fsr & FSR_NXM) {
150 __quad_fqtoi(x, &i);
151 } else {
152 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
153 __quad_setfsrp(&fsr);
154 }
155 }
156 return (i);
157 }
158