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5261 libm should stop using synonyms.h
5298 fabs is 0-sized, confuses dis(1) and others
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Approved by: Gordon Ross <gwr@nexenta.com>
5262 libm needs to be carefully unifdef'd
5268 libm doesn't need to hide symbols which are already local
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: Gordon Ross <gwr@nexenta.com>
Approved by: Gordon Ross <gwr@nexenta.com>
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--- old/usr/src/lib/libm/common/C/logb.c
+++ new/usr/src/lib/libm/common/C/logb.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
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20 20 */
21 21
22 22 /*
23 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
24 24 */
25 25 /*
26 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
27 27 * Use is subject to license terms.
28 28 */
29 29
30 -#if defined(ELFOBJ)
31 -#pragma weak logb = __logb
32 -#pragma weak _logb = __logb
33 -#endif
30 +#pragma weak __logb = logb
31 +#pragma weak _logb = logb
34 32
35 33 #include "libm.h"
36 34 #include "xpg6.h" /* __xpg6 */
37 35 #define _C99SUSv3_logb _C99SUSv3_logb_subnormal_is_like_ilogb
38 36
39 -#if defined(USE_FPSCALE) || defined(__x86)
37 +#if defined(__x86)
40 38 static const double two52 = 4503599627370496.0;
41 39 #else
42 40 /*
43 41 * v: high part of a non-zero subnormal |x|; w: low part of |x|
44 42 */
45 43 static int
46 44 ilogb_subnormal(unsigned v, unsigned w) {
47 45 int r = -1022 - 52;
48 46
49 47 if (v)
50 48 r += 32;
51 49 else
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52 50 v = w;
53 51 if (v & 0xffff0000)
54 52 r += 16, v >>= 16;
55 53 if (v & 0xff00)
56 54 r += 8, v >>= 8;
57 55 if (v & 0xf0)
58 56 r += 4, v >>= 4;
59 57 v <<= 1;
60 58 return (r + ((0xffffaa50 >> v) & 0x3));
61 59 }
62 -#endif /* defined(USE_FPSCALE) */
60 +#endif /* defined(__x86) */
63 61
64 62 double
65 63 logb(double x) {
66 64 int *px = (int *) &x, k = px[HIWORD] & ~0x80000000;
67 65
68 66 if (k < 0x00100000) {
69 67 if ((px[LOWORD] | k) == 0)
70 68 return (_SVID_libm_err(x, x, 45));
71 69 else if ((__xpg6 & _C99SUSv3_logb) != 0) {
72 -#if defined(USE_FPSCALE) || defined(__x86)
70 +#if defined(__x86)
73 71 x *= two52;
74 72 return ((double) (((px[HIWORD] & 0x7ff00000) >> 20)
75 73 - 1075));
76 74 #else
77 75 return ((double) ilogb_subnormal(k, px[LOWORD]));
78 76 #endif
79 77 } else
80 78 return (-1022.0);
81 79 } else if (k < 0x7ff00000)
82 80 return ((double) ((k >> 20) - 1023));
83 81 else
84 82 return (x * x);
85 83 }
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