mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-26 20:51:11 +00:00
106 lines
2.8 KiB
ArmAsm
106 lines
2.8 KiB
ArmAsm
/* ix87 specific implementation of arctanh function.
|
|
Copyright (C) 1996-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <machine/asm.h>
|
|
|
|
.section .rodata
|
|
|
|
.align ALIGNARG(4)
|
|
.type half,@object
|
|
half: .double 0.5
|
|
ASM_SIZE_DIRECTIVE(half)
|
|
.type one,@object
|
|
one: .double 1.0
|
|
ASM_SIZE_DIRECTIVE(one)
|
|
.type limit,@object
|
|
limit: .double 0.29
|
|
ASM_SIZE_DIRECTIVE(limit)
|
|
.align ALIGNARG(4)
|
|
.type ln2_2,@object
|
|
ln2_2: .tfloat 0.3465735902799726547086160
|
|
ASM_SIZE_DIRECTIVE(ln2_2)
|
|
|
|
#ifdef PIC
|
|
#define MO(op) op##@GOTOFF(%edx)
|
|
#else
|
|
#define MO(op) op
|
|
#endif
|
|
|
|
.text
|
|
ENTRY(__ieee754_atanhf)
|
|
movl 4(%esp), %ecx
|
|
|
|
movl %ecx, %eax
|
|
andl $0x7fffffff, %eax
|
|
cmpl $0x7f800000, %eax
|
|
ja 5f
|
|
|
|
#ifdef PIC
|
|
LOAD_PIC_REG (dx)
|
|
#endif
|
|
|
|
andl $0x80000000, %ecx // ECX == 0 iff X >= 0
|
|
|
|
fldt MO(ln2_2) // 0.5*ln2
|
|
xorl %ecx, 4(%esp)
|
|
flds 4(%esp) // |x| : 0.5*ln2
|
|
fcoml MO(half) // |x| : 0.5*ln2
|
|
fld %st(0) // |x| : |x| : 0.5*ln2
|
|
fnstsw // |x| : |x| : 0.5*ln2
|
|
sahf
|
|
jae 2f
|
|
fadd %st, %st(1) // |x| : 2*|x| : 0.5*ln2
|
|
fld %st // |x| : |x| : 2*|x| : 0.5*ln2
|
|
fsubrl MO(one) // 1-|x| : |x| : 2*|x| : 0.5*ln2
|
|
fxch // |x| : 1-|x| : 2*|x| : 0.5*ln2
|
|
fmul %st(2) // 2*|x|^2 : 1-|x| : 2*|x| : 0.5*ln2
|
|
fdivp // (2*|x|^2)/(1-|x|) : 2*|x| : 0.5*ln2
|
|
faddp // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2
|
|
fcoml MO(limit) // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2
|
|
fnstsw // 2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2
|
|
sahf
|
|
jae 4f
|
|
fyl2xp1 // 0.5*ln2*ld(1+2*|x|+(2*|x|^2)/(1-|x|))
|
|
jecxz 3f
|
|
fchs // 0.5*ln2*ld(1+2*x+(2*x^2)/(1-x))
|
|
3: ret
|
|
|
|
.align ALIGNARG(4)
|
|
4: faddl MO(one) // 1+2*|x|+(2*|x|^2)/(1-|x|) : 0.5*ln2
|
|
fyl2x // 0.5*ln2*ld(1+2*|x|+(2*|x|^2)/(1-|x|))
|
|
jecxz 3f
|
|
fchs // 0.5*ln2*ld(1+2*x+(2*x^2)/(1-x))
|
|
3: ret
|
|
|
|
.align ALIGNARG(4)
|
|
2: faddl MO(one) // 1+|x| : |x| : 0.5*ln2
|
|
fxch // |x| : 1+|x| : 0.5*ln2
|
|
fsubrl MO(one) // 1-|x| : 1+|x| : 0.5*ln2
|
|
fdivrp // (1+|x|)/(1-|x|) : 0.5*ln2
|
|
fyl2x // 0.5*ln2*ld((1+|x|)/(1-|x|))
|
|
jecxz 3f
|
|
fchs // 0.5*ln2*ld((1+x)/(1-x))
|
|
3: ret
|
|
|
|
// x == NaN
|
|
5: flds 4(%esp)
|
|
ret
|
|
END(__ieee754_atanhf)
|
|
strong_alias (__ieee754_atanhf, __atanhf_finite)
|