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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/expm1l.s
+++ new/usr/src/lib/libm/i386/src/expm1l.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 "expm1l.s"
30 30
31 31 #include "libm.h"
32 32 LIBM_ANSI_PRAGMA_WEAK(expm1l,function)
33 -#include "libm_synonyms.h"
34 33
35 34 .data
36 35 .align 4
37 36 ln2_hi: .long 0xd1d00000, 0xb17217f7, 0x00003ffe
38 37 ln2_lo: .long 0x4c67fc0d, 0x8654361c, 0x0000bfce
39 38
40 39 ENTRY(expm1l)
41 40 movl 12(%esp),%ecx / cx <--sign&bexp(x)
42 41 movl %ecx,%eax / ax <--sign&bexp(x)
43 42 andl $0x00007fff,%ecx / ecx <-- zero_xtnd(bexp(x))
44 43 cmpl $0x00003ffe,%ecx / Is |x| < ln(2)?
45 44 jb .shortcut / If so, take a shortcut.
46 45 je .check_tail / |x| may be only slightly < ln(2)
47 46 cmpl $0x00007fff,%ecx / bexp(|x|) = bexp(INF)?
48 47 je .not_finite / if so, x is not finite
49 48 andl $0x0000ffff,%eax / eax <-- sign&bexp(x)
50 49 cmpl $0x0000c006,%eax / x <= -128?
51 50 jae 1f / if so, simply return -1
52 51 cmpl $0x0000400d,%ecx / |x| < 16384 = 2^14?
53 52 jb .finite_non_special / if so, proceed with argument reduction
54 53 fldt 4(%esp) / x >= 16384; x
55 54 fld1 / 1, x
56 55 fscale / +Inf, x
57 56 fstp %st(1) / +Inf
58 57 ret
59 58
60 59 .finite_non_special: / -128 < x < -ln(2) || ln(2) < x < 2^14
61 60 fldt 4(%esp) / x
62 61 fld %st(0) / x, x
63 62 fldl2e / log2(e), x, x
64 63 fmulp / z := x*log2(e), x
65 64 frndint / [z], x
66 65 fst %st(2) / [z], x, [z]
67 66 PIC_SETUP(1)
68 67 fldt PIC_L(ln2_hi) / ln2_hi, [z], x, [z]
69 68 fmulp / [z]*ln2_hi, x, [z]
70 69 fsubrp %st,%st(1) / x-[z]*ln2_hi, [z]
71 70 fldt PIC_L(ln2_lo) / ln2_lo, x-[z]*ln2_hi, [z]
72 71 PIC_WRAPUP
73 72 fmul %st(2),%st / [z]*ln2_lo, x-[z]*ln2_hi, [z]
74 73 fsubrp %st,%st(1) / r := x-[z]*ln(2), [z]
75 74 fldl2e / log2(e), r, [z]
76 75 fmulp / f := r*log2(e), [z]
77 76 f2xm1 / 2^f-1,[z]
78 77 fld1 / 1, 2^f-1, [z]
79 78 faddp %st,%st(1) / 2^f, [z]
80 79 fscale / e^x, [z]
81 80 fstp %st(1) / e^x
82 81 fld1 / 1, e^x
83 82 fsubrp %st,%st(1) / e^x-1
84 83 ret
85 84
86 85 .check_tail:
87 86 movl 8(%esp),%ecx / ecx <-- hi_32(sgnfcnd(x))
88 87 cmpl $0xb17217f7,%ecx / Is |x| < ln(2)?
89 88 ja .finite_non_special
90 89 jb .shortcut
91 90 movl 4(%esp),%edx / edx <-- lo_32(x)
92 91 cmpl $0xd1cf79ab,%edx / Is |x| slightly < ln(2)?
93 92 ja .finite_non_special / branch if |x| slightly > ln(2)
94 93 .shortcut:
95 94 / Here, |x| < ln(2), so |z| = |x/ln(2)| < 1,
96 95 / whence z is in f2xm1's domain.
97 96 fldt 4(%esp) / x
98 97 fldl2e / log2(e), x
99 98 fmulp / z := x*log2(e)
100 99 f2xm1 / 2^(x*log2(e))-1 = e^x-1
101 100 ret
102 101
103 102 .not_finite:
104 103 movl 8(%esp),%ecx / ecx <-- hi_32(sgnfcnd(x))
105 104 cmpl $0x80000000,%ecx / hi_32(|x|) = hi_32(INF)?
106 105 jne .NaN_or_pinf / if not, x is NaN
107 106 movl 4(%esp),%edx / edx <-- lo_32(x)
108 107 cmpl $0,%edx / lo_32(x) = 0?
109 108 jne .NaN_or_pinf / if not, x is NaN
110 109 movl 12(%esp),%eax / ax <-- sign&bexp((x))
111 110 andl $0x00008000,%eax / here, x is infinite, but +/-?
112 111 jz .NaN_or_pinf / branch if x = +INF
113 112 1:
114 113 fld1 / Here, x = -inf, so return -1
115 114 fchs
116 115 ret
117 116
118 117 .NaN_or_pinf:
119 118 / Here, x = NaN or +inf, so load x and return immediately.
120 119 fldt 4(%esp)
121 120 ret
122 121 .align 4
123 122 SET_SIZE(expm1l)
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