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authorUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
committerUlrich Drepper <drepper@redhat.com>1999-07-14 00:54:57 +0000
commitabfbdde177c3a7155070dda1b2cdc8292054cc26 (patch)
treee021306b596381fbf8311d2b7eb294e918ff17c8 /sysdeps/libm-i387/e_acoshl.S
parent86421aa57ecfd70963ae66848bd6a6dd3b8e0fe6 (diff)
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Update.
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diff --git a/sysdeps/libm-i387/e_acoshl.S b/sysdeps/libm-i387/e_acoshl.S
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-/* ix87 specific implementation of arcsinh.
- Copyright (C) 1996, 1997 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)
- /* Please note that we use double value for 1.0. This number
- has an exact representation and so we don't get accuracy
- problems. The advantage is that the code is simpler. */
- ASM_TYPE_DIRECTIVE(one,@object)
-one: .double 1.0
- ASM_SIZE_DIRECTIVE(one)
- /* It is not important that this constant is precise. It is only
- a value which is known to be on the safe side for using the
- fyl2xp1 instruction. */
- ASM_TYPE_DIRECTIVE(limit,@object)
-limit: .double 0.29
- ASM_SIZE_DIRECTIVE(limit)
-
-#ifdef PIC
-#define MO(op) op##@GOTOFF(%edx)
-#else
-#define MO(op) op
-#endif
-
- .text
-ENTRY(__ieee754_acoshl)
- movl 12(%esp), %ecx
- andl $0xffff, %ecx
- cmpl $0x3fff, %ecx
- jl 5f // < 1 => invalid
- fldln2 // log(2)
- fldt 4(%esp) // x : log(2)
- cmpl $0x4020, %ecx
- ja 3f // x > 2^34
-#ifdef PIC
- call 1f
-1: popl %edx
- addl $_GLOBAL_OFFSET_TABLE_+[.-1b], %edx
-#endif
- cmpl $0x4000, %ecx
- ja 4f // x > 2
-
- // 1 <= x <= 2 => y = log1p(x-1+sqrt(2*(x-1)+(x-1)^2))
- fsubl MO(one) // x-1 : log(2)
- fld %st // x-1 : x-1 : log(2)
- fmul %st(1) // (x-1)^2 : x-1 : log(2)
- fadd %st(1) // x-1+(x-1)^2 : x-1 : log(2)
- fadd %st(1) // 2*(x-1)+(x-1)^2 : x-1 : log(2)
- fsqrt // sqrt(2*(x-1)+(x-1)^2) : x-1 : log(2)
- faddp // x-1+sqrt(2*(x-1)+(x-1)^2) : log(2)
- fcoml MO(limit)
- fnstsw
- sahf
- ja 2f
- fyl2xp1 // log1p(x-1+sqrt(2*(x-1)+(x-1)^2))
- ret
-
-2: faddl MO(one) // x+sqrt(2*(x-1)+(x-1)^2) : log(2)
- fyl2x // log(x+sqrt(2*(x-1)+(x-1)^2))
- ret
-
- // x > 2^34 => y = log(x) + log(2)
- .align ALIGNARG(4)
-3: fyl2x // log(x)
- fldln2 // log(2) : log(x)
- faddp // log(x)+log(2)
- ret
-
- // 2^34 > x > 2 => y = log(2*x - 1/(x+sqrt(x*x-1)))
- .align ALIGNARG(4)
-4: fld %st // x : x : log(2)
- fadd %st, %st(1) // x : 2*x : log(2)
- fld %st // x : x : 2*x : log(2)
- fmul %st(1) // x^2 : x : 2*x : log(2)
- fsubl MO(one) // x^2-1 : x : 2*x : log(2)
- fsqrt // sqrt(x^2-1) : x : 2*x : log(2)
- faddp // x+sqrt(x^2-1) : 2*x : log(2)
- fdivrl MO(one) // 1/(x+sqrt(x^2-1)) : 2*x : log(2)
- fsubrp // 2*x+1/(x+sqrt(x^2)-1) : log(2)
- fyl2x // log(2*x+1/(x+sqrt(x^2-1)))
- ret
-
- // x < 1 => NaN
- .align ALIGNARG(4)
-5: fldz
- fdiv %st, %st(0)
- ret
-END(__ieee754_acoshl)