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 /*
32 * _Qp_qtoux(x) returns (unsigned long)*x.
33 */
34 unsigned long
_Qp_qtoux(const union longdouble * x)35 _Qp_qtoux(const union longdouble *x)
36 {
37 union longdouble z;
38 unsigned long i, round;
39 unsigned int xm, fsr;
40
41 xm = x->l.msw & 0x7fffffff;
42
43 __quad_getfsrp(&fsr);
44
45 /* handle nan, inf, and out-of-range cases */
46 if (xm >= 0x403e0000) {
47 if (x->l.msw < 0x403f0000) {
48 i = 0x8000000000000000ul |
49 ((long) (xm & 0xffff) << 47) |
50 ((long) x->l.frac2 << 15) | (x->l.frac3 >> 17);
51 if ((x->l.frac3 & 0x1ffff) | x->l.frac4) {
52 /* signal inexact */
53 if (fsr & FSR_NXM) {
54 /* z = x - 2^63 */
55 if (xm & 0xffff ||
56 x->l.frac2 & 0xffff0000) {
57 z.l.msw = xm & 0xffff;
58 z.l.frac2 = x->l.frac2;
59 z.l.frac3 = x->l.frac3;
60 z.l.frac4 = x->l.frac4;
61 } else if (x->l.frac2 & 0xffff ||
62 x->l.frac3 & 0xffff0000) {
63 z.l.msw = x->l.frac2;
64 z.l.frac2 = x->l.frac3;
65 z.l.frac3 = x->l.frac4;
66 z.l.frac4 = 0;
67 } else if (x->l.frac3 & 0xffff ||
68 x->l.frac4 & 0xffff0000) {
69 z.l.msw = x->l.frac3;
70 z.l.frac2 = x->l.frac4;
71 z.l.frac3 = z.l.frac4 = 0;
72 } else {
73 z.l.msw = x->l.frac4;
74 z.l.frac2 = z.l.frac3 =
75 z.l.frac4 = 0;
76 }
77 xm = 0x403e;
78 while ((z.l.msw & 0x10000) == 0) {
79 z.l.msw = (z.l.msw << 1) |
80 (z.l.frac2 >> 31);
81 z.l.frac2 = (z.l.frac2 << 1) |
82 (z.l.frac3 >> 31);
83 z.l.frac3 = (z.l.frac3 << 1) |
84 (z.l.frac4 >> 31);
85 z.l.frac4 <<= 1;
86 xm--;
87 }
88 z.l.msw |= (xm << 16);
89 __quad_fqtox(&z, (long *)&i);
90 i |= 0x8000000000000000ul;
91 } else {
92 fsr = (fsr & ~FSR_CEXC) | FSR_NXA |
93 FSR_NXC;
94 __quad_setfsrp(&fsr);
95 }
96 }
97 return (i);
98 }
99 if (x->l.msw == 0xc03e0000 && x->l.frac2 == 0 &&
100 (x->l.frac3 & 0xfffe0000) == 0) {
101 /* return largest negative 64 bit int */
102 i = 0x8000000000000000ul;
103 if ((x->l.frac3 & 0x1ffff) | x->l.frac4) {
104 /* signal inexact */
105 if (fsr & FSR_NXM) {
106 __quad_fqtox(x, (long *)&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 = 0x7fffffffffffffffl;
116 if (fsr & FSR_NVM) {
117 __quad_fqtox(x, (long *)&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 i = 0l;
126 if (xm | x->l.frac2 | x->l.frac3 | x->l.frac4) {
127 /* signal inexact */
128 if (fsr & FSR_NXM) {
129 __quad_fqtox(x, (long *)&i);
130 } else {
131 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
132 __quad_setfsrp(&fsr);
133 }
134 }
135 return (i);
136 }
137
138 /* now x is in the range of long */
139 i = 0x4000000000000000l | ((long) (xm & 0xffff) << 46) |
140 ((long) x->l.frac2 << 14) | (x->l.frac3 >> 18);
141 round = i & ((1l << (0x403d - (xm >> 16))) - 1);
142 i >>= (0x403d - (xm >> 16));
143 if (x->l.msw & 0x80000000)
144 i = -i;
145 if (round | (x->l.frac3 & 0x3ffff) | x->l.frac4) {
146 /* signal inexact */
147 if (fsr & FSR_NXM) {
148 __quad_fqtox(x, (long *)&i);
149 } else {
150 fsr = (fsr & ~FSR_CEXC) | FSR_NXA | FSR_NXC;
151 __quad_setfsrp(&fsr);
152 }
153 }
154 return (i);
155 }
156