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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) 1996-2017 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
/* vim:set ts=4 sw=4 et: */
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