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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/exp2l.s
+++ new/usr/src/lib/libm/i386/src/exp2l.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 "exp2l.s"
30 30
31 31 #include "libm.h"
32 32 LIBM_ANSI_PRAGMA_WEAK(exp2l,function)
33 -#include "libm_synonyms.h"
34 33
35 34 ENTRY(exp2l)
36 35 movl 12(%esp),%ecx / cx <--sign&bexp(x)
37 36 andl $0x00007fff,%ecx / ecx <-- zero_xtnd(bexp(x))
38 37 cmpl $0x00003fff,%ecx / Is |x| <= 1?
39 38 jb .shortcut / If so, take a shortcut.
40 39 je .check_tail / |x| may be slightly > 1
41 40 cmpl $0x00007fff,%ecx / bexp(|x|) = bexp(INF)?
42 41 je .not_finite / if so, x is not finite
43 42 .finite_non_special: / Here, 1 < |x| < INF
44 43 fldt 4(%esp) / push arg
45 44 fld %st(0) / duplicate stack top
46 45 frndint / [x],x
47 46 fucom / x integral?
48 47 fnstsw %ax
49 48 sahf
50 49 je .x_integral / branch if x integral
51 50 fxch / x, [x]
52 51 fsub %st(1),%st / x-[x], [x]
53 52 f2xm1 / 2**(x-[x])-1, [x]
54 53 fld1 / 1,2**(x-[x])-1, [x]
55 54 faddp %st,%st(1) / 2**(x-[x]), [x]
56 55 fscale / 2**x = 2**(arg), [x]
57 56 fstp %st(1)
58 57 ret
59 58
60 59 .x_integral:
61 60 fstp %st(0) / ,x
62 61 fld1 / 1 = 2**0, x
63 62 fscale / 2**(0 + x) = 2**x, x
64 63 fstp %st(1) / 2**x
65 64 ret
66 65
67 66 .check_tail:
68 67 movl 8(%esp),%ecx / ecx <-- hi_32(sgnfcnd(x))
69 68 cmpl $0x80000000,%ecx / Is |x| <= 1?
70 69 ja .finite_non_special
71 70 movl 4(%esp),%edx / edx <-- lo_32(sgnfcnd(x))
72 71 cmpl $0x00000000,%edx / Is |x| slightly > 1?
73 72 ja .finite_non_special / branch if |x| slightly > 1
74 73 .shortcut:
75 74 / Here, |x| < 1,
76 75 / whence x is in f2xm1's domain.
77 76 fldt 4(%esp) / push x
78 77 f2xm1 / 2**x - 1
79 78 fld1 / 1,2**x - 1
80 79 faddp %st,%st(1) / 2**x
81 80 ret
82 81
83 82 .not_finite:
84 83 movl 8(%esp),%ecx / ecx <-- hi_32(sgnfcnd(x))
85 84 cmpl $0x80000000,%ecx / hi_32(|x|) = hi_32(INF)?
86 85 jne .NaN_or_pinf / if not, x is NaN
87 86 movl 4(%esp),%edx / edx <-- lo_32(x)
88 87 cmpl $0,%edx / lo_32(x) = 0?
89 88 jne .NaN_or_pinf / if not, x is NaN
90 89 movl 12(%esp),%eax / ax <-- sign&bexp((x))
91 90 andl $0x00008000,%eax / here, x is infinite, but +/-?
92 91 jz .NaN_or_pinf / branch if x = +INF
93 92 fldz / Here, x = -inf, so return 0
94 93 ret
95 94
96 95 .NaN_or_pinf:
97 96 / Here, x = NaN or +inf, so load x and return immediately.
98 97 fldt 4(%esp)
99 98 ret
100 99 .align 4
101 100 SET_SIZE(exp2l)
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