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 #define _Q_qtou _Qp_qtoui
31 #endif
32
33 /*
34 * _Q_qtou(x) returns (unsigned int)*x.
35 */
36 unsigned
_Q_qtou(const union longdouble * x)37 _Q_qtou(const union longdouble *x)
38 {
39 union longdouble z;
40 unsigned int xm, fsr;
41 int i, round;
42
43 xm = x->l.msw & 0x7fffffff;
44
45 __quad_getfsrp(&fsr);
46
47 /* handle nan, inf, and out-of-range cases */
48 if (xm >= 0x401e0000) {
49 if (x->l.msw < 0x401f0000) {
50 i = 0x80000000 | ((xm & 0xffff) << 15) |
51 (x->l.frac2 >> 17);
52 if ((x->l.frac2 & 0x1ffff) | x->l.frac3 | x->l.frac4) {
53 /* signal inexact */
54 if (fsr & FSR_NXM) {
55 /* z = x - 2^31 */
56 if (xm & 0xffff ||
57 x->l.frac2 & 0xffff0000) {
58 z.l.msw = xm & 0xffff;
59 z.l.frac2 = x->l.frac2;
60 z.l.frac3 = x->l.frac3;
61 z.l.frac4 = x->l.frac4;
62 } else if (x->l.frac2 & 0xffff ||
63 x->l.frac3 & 0xffff0000) {
64 z.l.msw = x->l.frac2;
65 z.l.frac2 = x->l.frac3;
66 z.l.frac3 = x->l.frac4;
67 z.l.frac4 = 0;
68 } else if (x->l.frac3 & 0xffff ||
69 x->l.frac4 & 0xffff0000) {
70 z.l.msw = x->l.frac3;
71 z.l.frac2 = x->l.frac4;
72 z.l.frac3 = z.l.frac4 = 0;
73 } else {
74 z.l.msw = x->l.frac4;
75 z.l.frac2 = z.l.frac3 =
76 z.l.frac4 = 0;
77 }
78 xm = 0x401e;
79 while ((z.l.msw & 0x10000) == 0) {
80 z.l.msw = (z.l.msw << 1) |
81 (z.l.frac2 >> 31);
82 z.l.frac2 = (z.l.frac2 << 1) |
83 (z.l.frac3 >> 31);
84 z.l.frac3 = (z.l.frac3 << 1) |
85 (z.l.frac4 >> 31);
86 z.l.frac4 <<= 1;
87 xm--;
88 }
89 z.l.msw |= (xm << 16);
90 __quad_fqtoi(&z, &i);
91 i |= 0x80000000;
92 } else {
93 fsr = (fsr & ~FSR_CEXC) | FSR_NXA |
94 FSR_NXC;
95 __quad_setfsrp(&fsr);
96 }
97 }
98 return (i);
99 }
100 if (x->l.msw == 0xc01e0000 && (x->l.frac2 & 0xfffe0000) == 0) {
101 /* return largest negative int */
102 i = 0x80000000;
103 if ((x->l.frac2 & 0x1ffff) | x->l.frac3 | x->l.frac4) {
104 /* signal inexact */
105 if (fsr & FSR_NXM) {
106 __quad_fqtoi(x, &i);
107 } else {
108 fsr = (fsr & ~FSR_CEXC) | FSR_NXA |
109 FSR_NXC;
110 __quad_setfsrp(&fsr);
111 }
112 }
113 return (i);
114 }
115 i = ((x->l.msw & 0x80000000)? 0x80000000 : 0x7fffffff);
116 if (fsr & FSR_NVM) {
117 __quad_fqtoi(x, &i);
118 } else {
119 fsr = (fsr & ~FSR_CEXC) | FSR_NVA | FSR_NVC;
120 __quad_setfsrp(&fsr);
121 }
122 return (i);
123 }
124 if (xm < 0x3fff0000) {
125 if (xm | x->l.frac2 | x->l.frac3 | x->l.frac4) {
126 /* signal inexact */
127 i = 0;
128 if (fsr & FSR_NXM) {
129 __quad_fqtoi(x, &i);
130 } else {
131 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
132 __quad_setfsrp(&fsr);
133 }
134 return (i);
135 }
136 return (0);
137 }
138
139 /* now x is in the range of int */
140 i = 0x40000000 | ((xm & 0xffff) << 14) | (x->l.frac2 >> 18);
141 round = i & ((1 << (0x401d - (xm >> 16))) - 1);
142 i >>= (0x401d - (xm >> 16));
143 if (x->l.msw & 0x80000000)
144 i = -i;
145 if (round | (x->l.frac2 & 0x3ffff) | x->l.frac3 | x->l.frac4) {
146 /* signal inexact */
147 if (fsr & FSR_NXM) {
148 __quad_fqtoi(x, &i);
149 } else {
150 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
151 __quad_setfsrp(&fsr);
152 }
153 }
154 return (i);
155 }
156