blob: 26c407b606aa3d0986b7d9f68d277e8b8d22885a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*
* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
*/
#include <machine/asm.h>
RCSID("$NetBSD: s_log1p.S,v 1.7 1995/05/09 00:10:58 jtc Exp $")
#ifdef __ELF__
.section .rodata
#else
.text
#endif
.align ALIGNARG(4)
/* The fyl2xp1 can only be used for values in
-1 + sqrt(2) / 2 <= x <= 1 - sqrt(2) / 2
0.29 is a safe value.
*/
limit: .tfloat 0.29
/* Please note: we use a double value here. Since 1.0 has
an exact representation this does not effect the accuracy
but it helps to optimize the code. */
one: .double 1.0
/*
* Use the fyl2xp1 function when the argument is in the range -0.29 to 0.29,
* otherwise fyl2x with the needed extra computation.
*/
.text
ENTRY(__log1pl)
fldln2
fldt 4(%esp)
#ifdef PIC
call 1f
1: popl %edx
addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %edx
#endif
fxam
fnstsw
fld %st
sahf
jc 3f // in case x is NaN or ħInf
4:
fabs
#ifdef PIC
fldt limit@GOTOFF(%edx)
#else
fldt limit
#endif
fcompp
fnstsw
sahf
jnc 2f
#ifdef PIC
faddl one@GOTOFF(%edx)
#else
faddl one
#endif
fyl2x
ret
2: fyl2xp1
ret
3: jp 4b // in case x is ħInf
fstp %st(1)
fstp %st(1)
ret
END (__log1pl)
weak_alias (__log1pl, log1pl)
|
