/* lzo1c_d.ash -- assembler implementation of the LZO1C decompression algorithm
This file is part of the LZO real-time data compression library.
Copyright (C) 2008 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2007 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2006 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2005 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2004 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2003 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2002 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2001 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2000 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1999 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1998 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1997 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 1996 Markus Franz Xaver Johannes Oberhumer
All Rights Reserved.
The LZO library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The LZO 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with the LZO library; see the file COPYING.
If not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
Markus F.X.J. Oberhumer
<markus@oberhumer.com>
http://www.oberhumer.com/opensource/lzo/
*/
/***********************************************************************
//
************************************************************************/
ALIGN3
.L1:
xorl %eax,%eax
movb (%esi),%al
incl %esi
cmpb $32,%al
jnb .LMATCH
orb %al,%al
jz .L12
movl %eax,%ecx
.LIT:
TEST_OP((%edi,%ecx),%ebx)
TEST_IP((%esi,%ecx),%ebx)
rep
movsb
.LM1:
movb (%esi),%al
incl %esi
cmpb $32,%al
jb .LM2
.LMATCH:
cmpb $64,%al
jb .LN3
movl %eax,%ecx
andb $31,%al
leal -1(%edi),%edx
shrl $5,%ecx
subl %eax,%edx
movb (%esi),%al
incl %esi
shll $5,%eax
subl %eax,%edx
incl %ecx
xchgl %esi,%edx
TEST_LOOKBEHIND(%esi)
TEST_OP((%edi,%ecx),%ebx)
rep
movsb
movl %edx,%esi
jmp .L1
ALIGN3
.L12:
LODSB
leal 32(%eax),%ecx
cmpb $248,%al
jb .LIT
movl $280,%ecx
subb $248,%al
jz .L11
xchgl %eax,%ecx
xorb %al,%al
shll %cl,%eax
xchgl %eax,%ecx
.L11:
TEST_OP((%edi,%ecx),%ebx)
TEST_IP((%esi,%ecx),%ebx)
rep
movsb
jmp .L1
ALIGN3
.LM2:
leal -1(%edi),%edx
subl %eax,%edx
LODSB
shll $5,%eax
subl %eax,%edx
xchgl %esi,%edx
TEST_LOOKBEHIND(%esi)
TEST_OP(4(%edi),%ebx)
movsb
movsb
movsb
movl %edx,%esi
movsb
xorl %eax,%eax
jmp .LM1
.LN3:
andb $31,%al
movl %eax,%ecx
jnz .LN6
movb $31,%cl
.LN4:
LODSB
orb %al,%al
jnz .LN5
addl N_255,%ecx
jmp .LN4
ALIGN3
.LN5:
addl %eax,%ecx
.LN6:
movb (%esi),%al
incl %esi
movl %eax,%ebx
andb $63,%al
movl %edi,%edx
subl %eax,%edx
movb (%esi),%al
incl %esi
shll $6,%eax
subl %eax,%edx
cmpl %edi,%edx
jz .LEOF
xchgl %edx,%esi
leal 3(%ecx),%ecx
TEST_LOOKBEHIND(%esi)
TEST_OP((%edi,%ecx),%eax)
rep
movsb
movl %edx,%esi
xorl %eax,%eax
shrl $6,%ebx
movl %ebx,%ecx
jnz .LIT
jmp .L1
.LEOF:
/**** xorl %eax,%eax eax=0 from above */
cmpl $1,%ecx /* ecx must be 1 */
setnz %al
/*
vi:ts=4
*/
