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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/exp10l.s
+++ new/usr/src/lib/libm/i386/src/exp10l.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 /*
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22 22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
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 "exp10l.s"
30 30
31 31 #include "libm.h"
32 -LIBM_ANSI_PRAGMA_WEAK(exp10l,function)
33 -#include "libm_synonyms.h"
34 32
35 33 .data
36 34 .align 4
37 35 lt2_hi: .long 0xfbd00000, 0x9a209a84, 0x00003ffd
38 36 lt2_lo: .long 0x653f4837, 0x8677076a, 0x0000bfc9
39 37
40 38 ENTRY(exp10l)
41 39 movl 12(%esp),%ecx / cx <--sign&bexp(x)
42 40 andl $0x00007fff,%ecx / ecx <-- zero_xtnd(bexp(x))
43 41 cmpl $0x00003ffd,%ecx / Is |x| < log10(2)?
44 42 jb .shortcut / If so, take a shortcut.
45 43 je .check_tail / maybe |x| only slightly < log10(2)
46 44 cmpl $0x00007fff,%ecx / bexp(|x|) = bexp(INF)?
47 45 je .not_finite / if so, x is not finite
48 46 cmpl $0x0000400e,%ecx / |x| < 32768 = 2^15?
49 47 jb .finite_non_special / if so, proceed with argument reduction
50 48 fldt 4(%esp) / x
51 49 fld1 / 1, x
52 50 jmp 1f
53 51 .finite_non_special: / Here, log10(2) < |x| < 2^15
54 52 fldt 4(%esp) / x
55 53 fld %st(0) / x, x
56 54 fldl2t / log2(10), x, x
57 55 fmulp / z := x*log2(10), x
58 56 frndint / [z], x
59 57 fst %st(2) / [z], x, [z]
60 58 PIC_SETUP(1)
61 59 fldt PIC_L(lt2_hi) / lt2_hi, [z], x, [z]
62 60 fmulp / [z]*lt2_hi, x, [z]
63 61 fsubrp %st,%st(1) / x-[z]*lt2_hi, [z]
64 62 fldt PIC_L(lt2_lo) / lt2_lo, x-[z]*lt2_hi, [z]
65 63 PIC_WRAPUP
66 64 fmul %st(2),%st / [z]*lt2_lo, x-[z]*lt2_hi, [z]
67 65 fsubrp %st,%st(1) / r := x-[z]*log10(2), [z]
68 66 fldl2t / log2(10), r, [z]
69 67 fmulp / f := r*log2(10), [z]
70 68 f2xm1 / 2^f-1,[z]
71 69 fld1 / 1, 2^f-1, [z]
72 70 faddp %st,%st(1) / 2^f, [z]
73 71 1:
74 72 fscale / 10^x, [z]
75 73 fstp %st(1)
76 74 ret
77 75
78 76 .check_tail:
79 77 movl 8(%esp),%ecx / ecx <-- hi_32(sgnfcnd(x))
80 78 cmpl $0x9a209a84,%ecx / Is |x| < log10(2)?
81 79 ja .finite_non_special
82 80 jb .shortcut
83 81 movl 4(%esp),%edx / edx <-- lo_32(sgnfcnd(x))
84 82 cmpl $0xfbcff798,%edx / Is |x| slightly > log10(2)?
85 83 ja .finite_non_special / branch if |x| slightly > log10(2)
86 84 .shortcut:
87 85 / Here, |x| < log10(2), so |z| = |x/log10(2)| < 1
88 86 / whence z is in f2xm1's domain.
89 87 fldt 4(%esp) / x
90 88 fldl2t / log2(10), x
91 89 fmulp / z := x*log2(10)
92 90 f2xm1 / 2^z-1
93 91 fld1 / 1, 2^z-1
94 92 faddp %st,%st(1) / 10^x
95 93 ret
96 94
97 95 .not_finite:
98 96 movl 8(%esp),%ecx / ecx <-- hi_32(sgnfcnd(x))
99 97 cmpl $0x80000000,%ecx / hi_32(sgnfcnd(x)) = hi_32(sgnfcnd(INF))?
100 98 jne .NaN_or_pinf / if not, x is NaN or unsupp.
101 99 movl 4(%esp),%edx / edx <-- lo_32(sgnfcnd(x))
102 100 cmpl $0,%edx / lo_32(sgnfcnd(x)) = 0?
103 101 jne .NaN_or_pinf / if not, x is NaN
104 102 movl 12(%esp),%eax / ax <-- sign&bexp((x))
105 103 andl $0x00008000,%eax / here, x is infinite, but +/-?
106 104 jz .NaN_or_pinf / branch if x = +INF
107 105 fldz / Here, x = -inf, so return 0
108 106 ret
109 107
110 108 .NaN_or_pinf:
111 109 / Here, x = NaN or +inf, so load x and return immediately.
112 110 fldt 4(%esp)
113 111 ret
114 112 .align 4
115 113 SET_SIZE(exp10l)
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