blob: ac2bd22a4fc5fc31b758beafff689fb73fe070a2 (
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
|
/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*
* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
* Adapted for x86-64 by Andreas Jaeger <aj@suse.de>.
*/
#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.
*/
#ifdef PIC
#define MO(op) op##(%rip)
#else
#define MO(op) op
#endif
.text
ENTRY(__log1pl)
fldln2
fldt 8(%rsp)
fxam
fnstsw
fld %st
testb $1, %ah
jnz 3f // in case x is NaN or ħInf
4:
fabs
fldt MO(limit)
fcompp
fnstsw
andb $1,%ah
jz 2f
faddl MO(one)
fyl2x
ret
2: fyl2xp1
ret
3: testb $4, %ah
jnz 4b // in case x is ħInf
fstp %st(1)
fstp %st(1)
ret
END (__log1pl)
weak_alias (__log1pl, log1pl)
|
