]>
Commit | Line | Data |
---|---|---|
d38cd08c | 1 | /* ix87 specific implementation of arctanh function. |
04277e02 | 2 | Copyright (C) 1996-2019 Free Software Foundation, Inc. |
d38cd08c UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
d38cd08c UD |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
d38cd08c | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
d38cd08c UD |
19 | |
20 | #include <machine/asm.h> | |
37825319 | 21 | #include <i386-math-asm.h> |
d38cd08c | 22 | |
d38cd08c | 23 | .section .rodata |
d38cd08c UD |
24 | |
25 | .align ALIGNARG(4) | |
b67e9372 | 26 | .type half,@object |
d38cd08c UD |
27 | half: .double 0.5 |
28 | ASM_SIZE_DIRECTIVE(half) | |
b67e9372 | 29 | .type one,@object |
d38cd08c UD |
30 | one: .double 1.0 |
31 | ASM_SIZE_DIRECTIVE(one) | |
b67e9372 | 32 | .type limit,@object |
d38cd08c UD |
33 | limit: .double 0.29 |
34 | ASM_SIZE_DIRECTIVE(limit) | |
b67e9372 | 35 | .type ln2_2,@object |
d38cd08c UD |
36 | ln2_2: .tfloat 0.3465735902799726547086160 |
37 | ASM_SIZE_DIRECTIVE(ln2_2) | |
38 | ||
37825319 | 39 | DEFINE_DBL_MIN |
8020a808 | 40 | |
d38cd08c UD |
41 | #ifdef PIC |
42 | #define MO(op) op##@GOTOFF(%edx) | |
43 | #else | |
44 | #define MO(op) op | |
45 | #endif | |
46 | ||
47 | .text | |
48 | ENTRY(__ieee754_atanh) | |
49 | movl 8(%esp), %ecx | |
50 | ||
15daa639 UD |
51 | movl %ecx, %eax |
52 | andl $0x7fffffff, %eax | |
53 | cmpl $0x7ff00000, %eax | |
54 | jae 5f | |
55 | 7: | |
56 | ||
d38cd08c | 57 | #ifdef PIC |
1a19b889 | 58 | LOAD_PIC_REG (dx) |
d38cd08c UD |
59 | #endif |
60 | ||
61 | andl $0x80000000, %ecx // ECX == 0 iff X >= 0 | |
62 | ||
63 | fldt MO(ln2_2) // 0.5*ln2 | |
64 | xorl %ecx, 8(%esp) | |
65 | fldl 4(%esp) // |x| : 0.5*ln2 | |
66 | fcoml MO(half) // |x| : 0.5*ln2 | |
67 | fld %st // |x| : |x| : 0.5*ln2 | |
68 | fnstsw // |x| : |x| : 0.5*ln2 | |
69 | sahf | |
70 | jae 2f | |
71 | fadd %st, %st(1) // |x| : 2*|x| : 0.5*ln2 | |
72 | fld %st // |x| : |x| : 2*|x| : 0.5*ln2 | |
73 | fsubrl MO(one) // 1-|x| : |x| : 2*|x| : 0.5*ln2 | |
74 | fxch // |x| : 1-|x| : 2*|x| : 0.5*ln2 | |
75 | fmul %st(2) // 2*|x|^2 : 1-|x| : 2*|x| : 0.5*ln2 | |
76 | fdivp // (2*|x|^2)/(1-|x|) : 2*|x| : 0.5*ln2 | |
77 | faddp // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
78 | fcoml MO(limit) // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
79 | fnstsw // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
80 | sahf | |
81 | jae 4f | |
82 | fyl2xp1 // 0.5*ln2*ld(1+2*|x|+(2*|x|^2)/(1-|x|)) | |
37825319 JM |
83 | DBL_CHECK_FORCE_UFLOW_NONNEG |
84 | jecxz 3f | |
d38cd08c UD |
85 | fchs // 0.5*ln2*ld(1+2*x+(2*x^2)/(1-x)) |
86 | 3: ret | |
87 | ||
88 | .align ALIGNARG(4) | |
89 | 4: faddl MO(one) // 1+2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
90 | fyl2x // 0.5*ln2*ld(1+2*|x|+(2*|x|^2)/(1-|x|)) | |
91 | jecxz 3f | |
92 | fchs // 0.5*ln2*ld(1+2*x+(2*x^2)/(1-x)) | |
93 | 3: ret | |
94 | ||
95 | .align ALIGNARG(4) | |
96 | 2: faddl MO(one) // 1+|x| : |x| : 0.5*ln2 | |
97 | fxch // |x| : 1+|x| : 0.5*ln2 | |
98 | fsubrl MO(one) // 1-|x| : 1+|x| : 0.5*ln2 | |
99 | fdivrp // (1+|x|)/(1-|x|) : 0.5*ln2 | |
100 | fyl2x // 0.5*ln2*ld((1+|x|)/(1-|x|)) | |
101 | jecxz 3f | |
102 | fchs // 0.5*ln2*ld((1+x)/(1-x)) | |
103 | 3: ret | |
15daa639 UD |
104 | |
105 |