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/* lzo1f_d.ash -- assembler implementation of the LZO1F decompression algorithm
This file is part of the LZO real-time data compression library.
Copyright (C) 2011 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2010 Markus Franz Xaver Johannes Oberhumer
Copyright (C) 2009 Markus Franz Xaver Johannes Oberhumer
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
.L0:
xorl %eax,%eax
movb (%esi),%al
incl %esi
cmpb $31,%al
ja .LM2
orb %al,%al
movl %eax,%ecx
jnz .L2
1:
LODSB
orb %al,%al
jnz 2f
addl N_255,%ecx
jmp 1b
2:
lea 31(%eax,%ecx),%ecx
.L2:
TEST_OP((%edi,%ecx),%ebx)
TEST_IP((%esi,%ecx),%ebx)
movb %cl,%al
shrl $2,%ecx
rep
movsl
andb $3,%al
jz 1f
movl (%esi),%ebx
addl %eax,%esi
movl %ebx,(%edi)
addl %eax,%edi
1:
movb (%esi),%al
incl %esi
.LM1:
cmpb $31,%al
jbe .LM21
.LM2:
cmpb $223,%al
ja .LM3
movl %eax,%ecx
shrl $2,%eax
lea -1(%edi),%edx
andb $7,%al
shrl $5,%ecx
movl %eax,%ebx
movb (%esi),%al
leal (%ebx,%eax,8),%eax
incl %esi
.LM5:
subl %eax,%edx
addl $2,%ecx
xchgl %edx,%esi
TEST_LOOKBEHIND(%esi)
TEST_OP((%edi,%ecx),%ebx)
cmpl $6,%ecx
jb 1f
cmpl $4,%eax
jb 1f
movb %cl,%al
shrl $2,%ecx
rep
movsl
andb $3,%al
movb %al,%cl
1:
rep
movsb
movl %edx,%esi
.LN1:
movb -2(%esi),%cl
andl $3,%ecx
jz .L0
movl (%esi),%eax
addl %ecx,%esi
movl %eax,(%edi)
addl %ecx,%edi
xorl %eax,%eax
movb (%esi),%al
incl %esi
jmp .LM1
.LM21:
TEST_OP(3(%edi),%edx)
shrl $2,%eax
leal -0x801(%edi),%edx
movl %eax,%ecx
movb (%esi),%al
incl %esi
leal (%ecx,%eax,8),%eax
subl %eax,%edx
TEST_LOOKBEHIND(%edx)
movl (%edx),%eax
movl %eax,(%edi)
addl $3,%edi
jmp .LN1
1:
LODSB
orb %al,%al
jnz 2f
addl N_255,%ecx
jmp 1b
2:
lea 31(%eax,%ecx),%ecx
jmp .LM4
ALIGN3
.LM3:
andb $31,%al
movl %eax,%ecx
jz 1b
.LM4:
movl %edi,%edx
movw (%esi),%ax
addl $2,%esi
shrl $2,%eax
jnz .LM5
.LEOF:
/**** xorl %eax,%eax eax=0 from above */
cmpl $1,%ecx /* ecx must be 1 */
setnz %al
/*
vi:ts=4
*/
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