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--- old/usr/src/lib/libm/common/C/nextafter.c
+++ new/usr/src/lib/libm/common/C/nextafter.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
23 23 */
24 24 /*
25 25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
26 26 * Use is subject to license terms.
27 27 */
28 28
29 29 #pragma weak nextafter = __nextafter
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30 30 #pragma weak _nextafter = __nextafter
31 31
32 32 #include "libm.h"
33 33 #include <float.h> /* DBL_MIN */
34 34
35 35 double
36 36 nextafter(double x, double y) {
37 37 int hx, hy, k;
38 38 double ans;
39 39 unsigned lx;
40 + volatile double dummy;
40 41
41 42 hx = ((int *)&x)[HIWORD];
42 43 lx = ((int *)&x)[LOWORD];
43 44 hy = ((int *)&y)[HIWORD];
44 45 k = (hx & ~0x80000000) | lx;
45 46
46 47 if (x == y)
47 48 return (y); /* C99 requirement */
48 49 if (x != x || y != y)
49 50 return (x * y);
50 51 if (k == 0) { /* x = 0 */
51 52 k = hy & 0x80000000;
52 53 ((int *)&ans)[HIWORD] = k;
53 54 ((int *)&ans)[LOWORD] = 1;
54 55 } else if (hx >= 0) {
55 56 if (x > y) {
56 57 ((int *)&ans)[LOWORD] = lx - 1;
57 58 k = (lx == 0)? hx - 1 : hx;
58 59 ((int *)&ans)[HIWORD] = k;
59 60 } else {
60 61 ((int *)&ans)[LOWORD] = lx + 1;
61 62 k = (lx == 0xffffffff)? hx + 1 : hx;
62 63 ((int *)&ans)[HIWORD] = k;
63 64 }
64 65 } else {
65 66 if (x < y) {
66 67 ((int *)&ans)[LOWORD] = lx - 1;
67 68 k = (lx == 0)? hx - 1 : hx;
68 69 ((int *)&ans)[HIWORD] = k;
69 70 } else {
70 71 ((int *)&ans)[LOWORD] = lx + 1;
71 72 k = (lx == 0xffffffff)? hx + 1 : hx;
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72 73 ((int *)&ans)[HIWORD] = k;
73 74 }
74 75 }
75 76 k = (k >> 20) & 0x7ff;
76 77 if (k == 0x7ff) {
77 78 /* overflow */
78 79 return (_SVID_libm_err(x, y, 46));
79 80 #if !defined(__lint)
80 81 } else if (k == 0) {
81 82 /* underflow */
82 - volatile double dummy = DBL_MIN * copysign(DBL_MIN, x);
83 + dummy = DBL_MIN * copysign(DBL_MIN, x);
83 84 #endif
84 85 }
85 86 return (ans);
86 87 }
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