projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| d38cd08c UD |
1 | /* ix87 specific implementation of arctanh function. |
| 2 | Copyright (C) 1996 Free Software Foundation, Inc. | |
| 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 | |
| 7 | modify it under the terms of the GNU Library General Public License as | |
| 8 | published by the Free Software Foundation; either version 2 of the | |
| 9 | License, or (at your option) any later version. | |
| 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 | |
| 14 | Library General Public License for more details. | |
| 15 | ||
| 16 | You should have received a copy of the GNU Library General Public | |
| 17 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
| 18 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
| 19 | Boston, MA 02111-1307, USA. */ | |
| 20 | ||
| 21 | #include <machine/asm.h> | |
| 22 | ||
| 23 | #ifdef __ELF__ | |
| 24 | .section .rodata | |
| 25 | #else | |
| 26 | .text | |
| 27 | #endif | |
| 28 | ||
| 29 | .align ALIGNARG(4) | |
| 30 | ASM_TYPE_DIRECTIVE(half,@object) | |
| 31 | half: .double 0.5 | |
| 32 | ASM_SIZE_DIRECTIVE(half) | |
| 33 | ASM_TYPE_DIRECTIVE(one,@object) | |
| 34 | one: .double 1.0 | |
| 35 | ASM_SIZE_DIRECTIVE(one) | |
| 36 | ASM_TYPE_DIRECTIVE(limit,@object) | |
| 37 | limit: .double 0.29 | |
| 38 | ASM_SIZE_DIRECTIVE(limit) | |
| 39 | ASM_TYPE_DIRECTIVE(ln2_2,@object) | |
| 40 | ln2_2: .tfloat 0.3465735902799726547086160 | |
| 41 | ASM_SIZE_DIRECTIVE(ln2_2) | |
| 42 | ||
| 43 | #ifdef PIC | |
| 44 | #define MO(op) op##@GOTOFF(%edx) | |
| 45 | #else | |
| 46 | #define MO(op) op | |
| 47 | #endif | |
| 48 | ||
| 49 | .text | |
| 50 | ENTRY(__ieee754_atanh) | |
| 51 | movl 8(%esp), %ecx | |
| 52 | ||
| 53 | #ifdef PIC | |
| 54 | call 1f | |
| 55 | 1: popl %edx | |
| 56 | addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %edx | |
| 57 | #endif | |
| 58 | ||
| 59 | andl $0x80000000, %ecx // ECX == 0 iff X >= 0 | |
| 60 | ||
| 61 | fldt MO(ln2_2) // 0.5*ln2 | |
| 62 | xorl %ecx, 8(%esp) | |
| 63 | fldl 4(%esp) // |x| : 0.5*ln2 | |
| 64 | fcoml MO(half) // |x| : 0.5*ln2 | |
| 65 | fld %st // |x| : |x| : 0.5*ln2 | |
| 66 | fnstsw // |x| : |x| : 0.5*ln2 | |
| 67 | sahf | |
| 68 | jae 2f | |
| 69 | fadd %st, %st(1) // |x| : 2*|x| : 0.5*ln2 | |
| 70 | fld %st // |x| : |x| : 2*|x| : 0.5*ln2 | |
| 71 | fsubrl MO(one) // 1-|x| : |x| : 2*|x| : 0.5*ln2 | |
| 72 | fxch // |x| : 1-|x| : 2*|x| : 0.5*ln2 | |
| 73 | fmul %st(2) // 2*|x|^2 : 1-|x| : 2*|x| : 0.5*ln2 | |
| 74 | fdivp // (2*|x|^2)/(1-|x|) : 2*|x| : 0.5*ln2 | |
| 75 | faddp // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
| 76 | fcoml MO(limit) // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
| 77 | fnstsw // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
| 78 | sahf | |
| 79 | jae 4f | |
| 80 | fyl2xp1 // 0.5*ln2*ld(1+2*|x|+(2*|x|^2)/(1-|x|)) | |
| 81 | jecxz 3f | |
| 82 | fchs // 0.5*ln2*ld(1+2*x+(2*x^2)/(1-x)) | |
| 83 | 3: ret | |
| 84 | ||
| 85 | .align ALIGNARG(4) | |
| 86 | 4: faddl MO(one) // 1+2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2 | |
| 87 | fyl2x // 0.5*ln2*ld(1+2*|x|+(2*|x|^2)/(1-|x|)) | |
| 88 | jecxz 3f | |
| 89 | fchs // 0.5*ln2*ld(1+2*x+(2*x^2)/(1-x)) | |
| 90 | 3: ret | |
| 91 | ||
| 92 | .align ALIGNARG(4) | |
| 93 | 2: faddl MO(one) // 1+|x| : |x| : 0.5*ln2 | |
| 94 | fxch // |x| : 1+|x| : 0.5*ln2 | |
| 95 | fsubrl MO(one) // 1-|x| : 1+|x| : 0.5*ln2 | |
| 96 | fdivrp // (1+|x|)/(1-|x|) : 0.5*ln2 | |
| 97 | fyl2x // 0.5*ln2*ld((1+|x|)/(1-|x|)) | |
| 98 | jecxz 3f | |
| 99 | fchs // 0.5*ln2*ld((1+x)/(1-x)) | |
| 100 | 3: ret | |
| 101 | END(__ieee754_atanh) |