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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/R/logbf.c
+++ new/usr/src/lib/libm/common/R/logbf.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 logbf = __logbf
32 -#endif
30 +#pragma weak __logbf = logbf
33 31
34 32 #include "libm.h"
35 33 #include "xpg6.h" /* __xpg6 */
36 34 #define _C99SUSv3_logb _C99SUSv3_logb_subnormal_is_like_ilogb
37 35
38 -#if defined(USE_FPSCALE) || defined(__x86)
36 +#if defined(__x86)
39 37 static const float two25 = 33554432.0F;
40 38 #else
41 39 /*
42 40 * v: a non-zero subnormal |x|
43 41 */
44 42 static int
45 43 ilogbf_subnormal(unsigned v) {
46 44 int r = -126 - 23;
47 45
48 46 if (v & 0xffff0000)
49 47 r += 16, v >>= 16;
50 48 if (v & 0xff00)
51 49 r += 8, v >>= 8;
52 50 if (v & 0xf0)
53 51 r += 4, v >>= 4;
54 52 v <<= 1;
55 53 return (r + ((0xffffaa50 >> v) & 0x3));
56 54 }
57 -#endif /* defined(USE_FPSCALE) */
55 +#endif /* defined(__x86) */
58 56
59 57 static float
60 58 raise_division(float t) {
61 59 #pragma STDC FENV_ACCESS ON
62 60 static const float zero = 0.0F;
63 61 return (t / zero);
64 62 }
65 63
66 64 float
67 65 logbf(float x) {
68 66 int k = *((int *) &x) & ~0x80000000;
69 67
70 68 if (k < 0x00800000) {
71 69 if (k == 0)
72 70 return (raise_division(-1.0F));
73 71 else if ((__xpg6 & _C99SUSv3_logb) != 0) {
74 -#if defined(USE_FPSCALE) || defined(__x86)
72 +#if defined(__x86)
75 73 x *= two25;
76 74 return ((float) (((*((int *) &x) & 0x7f800000) >> 23) -
77 75 152));
78 76 #else
79 77 return ((float) ilogbf_subnormal(k));
80 78 #endif
81 79 } else
82 80 return (-126.F);
83 81 } else if (k < 0x7f800000)
84 82 return ((float) ((k >> 23) - 127));
85 83 else
86 84 return (x * x);
87 85 }
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