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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>
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--- old/usr/src/lib/libm/i386/src/ilogbl.s
+++ new/usr/src/lib/libm/i386/src/ilogbl.s
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.
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23 23 */
24 24 /*
25 25 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
26 26 * Use is subject to license terms.
27 27 */
28 28
29 29 .file "ilogbl.s"
30 30
31 31 #include "libm.h"
32 32 LIBM_ANSI_PRAGMA_WEAK(ilogbl,function)
33 -#include "libm_synonyms.h"
34 33 #include "xpg6.h"
35 34
36 35 .data
37 36 .align 8
38 37 two63: .long 0x0,0x43d00000 / 2**63
39 38
40 39 ENTRY(ilogbl)
41 40 movl 12(%esp),%eax / eax <-- sign and bexp of x
42 41 andl $0x00007fff,%eax / eax <-- bexp(x)
43 42 jz .bexp_0 / jump iff x is 0 or subnormal
44 43 / here, biased exponent is non-zero
45 44 testl $0x80000000,8(%esp) / test msb of hi_32(sgnfcnd(x))
46 45 jz .ilogbl_not_finite / jump if unsupported format
47 46 cmpl $0x00007fff,%eax
48 47 je .ilogbl_not_finite
49 48 subl $16383,%eax / unbias exponent by 16383 = 0x3fff
50 49 ret
51 50
52 51 .ilogbl_not_finite:
53 52 movl $0x7fffffff,%eax / x is NaN/inf/unsup
54 53 jmp 0f
55 54
56 55 .bexp_0:
57 56 movl 8(%esp),%eax / eax <-- hi_32(sgnfcnd(x))
58 57 orl 4(%esp),%eax / test whether x is 0
59 58 jnz .ilogbl_subnorm / jump iff x is subnormal
60 59 movl $0x80000001,%eax / x is +/-0, so return 0x80000001
61 60 0:
62 61 PIC_SETUP(0)
63 62 PIC_G_LOAD(movzwl,__xpg6,ecx)
64 63 PIC_WRAPUP
65 64 andl $_C99SUSv3_ilogb_0InfNaN_raises_invalid,%ecx
66 65 cmpl $0,%ecx
67 66 je 1f
68 67 fldz
69 68 fdivp %st,%st(0) / raise invalid as per SUSv3
70 69 1:
71 70 ret
72 71
73 72
74 73 .ilogbl_subnorm: / subnormal or pseudo-denormal input
75 74 fldt 4(%esp) / push x, setting D-flag
76 75 PIC_SETUP(1)
77 76 fmull PIC_L(two63) / x*2**63
78 77 PIC_WRAPUP
79 78 subl $12,%esp
80 79 fstpt (%esp)
81 80 movl $0x00007fff,%eax
82 81 andl 8(%esp),%eax / eax <-- sign and bexp of x*2**63
83 82 subl $16445,%eax / unbias it by (16,383 + 63)
84 83 addl $12,%esp
85 84 ret
86 85 .align 4
87 86 SET_SIZE(ilogbl)
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