/* ix87 specific implementation of arctanh function. Copyright (C) 1996 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include <machine/asm.h> #ifdef __ELF__ .section .rodata #else .text #endif .align ALIGNARG(4) ASM_TYPE_DIRECTIVE(half,@object) half: .double 0.5 ASM_SIZE_DIRECTIVE(half) ASM_TYPE_DIRECTIVE(one,@object) one: .double 1.0 ASM_SIZE_DIRECTIVE(one) ASM_TYPE_DIRECTIVE(limit,@object) limit: .double 0.29 ASM_SIZE_DIRECTIVE(limit) ASM_TYPE_DIRECTIVE(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_atanh) movl 8(%esp), %ecx #ifdef PIC call 1f 1: popl %edx addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %edx #endif andl $0x80000000, %ecx // ECX == 0 iff X >= 0 fldt MO(ln2_2) // 0.5*ln2 xorl %ecx, 8(%esp) fldl 4(%esp) // |x| : 0.5*ln2 fcoml MO(half) // |x| : 0.5*ln2 fld %st // |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 END(__ieee754_atanh)