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/* lzo1x_d.ash -- assembler implementation of the LZO1X 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/
*/
#if !defined(LZO1X) && !defined(LZO1Y)
# define LZO1X
#endif
#if defined(LZO_FAST)
# define NN 3
#else
# define NN 0
#endif
/***********************************************************************
// init
************************************************************************/
xorl %eax,%eax
xorl %ebx,%ebx /* high bits 9-32 stay 0 */
lodsb
cmpb $17,%al
jbe .L01
subb $17-NN,%al
#if defined(LZO_FAST)
jmp .LFLR
#else
cmpb $4,%al
jae .LFLR
#if 1
TEST_OP((%edi,%eax),%edx)
TEST_IP((%esi,%eax),%edx)
movl %eax,%ecx
jmp .LFLR2
#else
jmp .LFLR3
#endif
#endif
/***********************************************************************
// literal run
************************************************************************/
0: addl N_255,%eax
TEST_IP(18(%esi,%eax),%edx) /* minimum */
1: movb (%esi),%bl
incl %esi
orb %bl,%bl
jz 0b
leal 18+NN(%eax,%ebx),%eax
jmp 3f
ALIGN3
.L00:
#ifdef LZO_DEBUG
andl $0xffffff00,%eax ; jnz .L_assert_fail
andl $0xffffff00,%ebx ; jnz .L_assert_fail
xorl %eax,%eax ; xorl %ebx,%ebx
xorl %ecx,%ecx ; xorl %edx,%edx
#endif
TEST_IP_R(%esi)
LODSB
.L01:
cmpb $16,%al
jae .LMATCH
/* a literal run */
orb %al,%al
jz 1b
addl $3+NN,%eax
3:
.LFLR:
TEST_OP(-NN(%edi,%eax),%edx)
TEST_IP(-NN(%esi,%eax),%edx)
#if defined(LZO_FAST)
movl %eax,%ecx
NOTL_3(%eax)
shrl $2,%ecx
andl N_3,%eax
COPYL(%esi,%edi,%edx)
subl %eax,%esi
subl %eax,%edi
#else
movl %eax,%ecx
shrl $2,%eax
andl N_3,%ecx
COPYL_C(%esi,%edi,%edx,%eax)
.LFLR2:
rep
movsb
#endif
#ifdef LZO_DEBUG
andl $0xffffff00,%eax ; jnz .L_assert_fail
andl $0xffffff00,%ebx ; jnz .L_assert_fail
xorl %eax,%eax ; xorl %ebx,%ebx
xorl %ecx,%ecx ; xorl %edx,%edx
#endif
LODSB
cmpb $16,%al
jae .LMATCH
/***********************************************************************
// R1
************************************************************************/
TEST_OP(3(%edi),%edx)
shrl $2,%eax
movb (%esi),%bl
#if defined(LZO1X)
leal -0x801(%edi),%edx
#elif defined(LZO1Y)
leal -0x401(%edi),%edx
#endif
leal (%eax,%ebx,4),%eax
incl %esi
subl %eax,%edx
TEST_LOOKBEHIND(%edx)
#if defined(LZO_FAST)
movl (%edx),%ecx
movl %ecx,(%edi)
#else
movb (%edx),%al
movb %al,(%edi)
movb 1(%edx),%al
movb %al,1(%edi)
movb 2(%edx),%al
movb %al,2(%edi)
#endif
addl N_3,%edi
jmp .LMDONE
/***********************************************************************
// M2
************************************************************************/
ALIGN3
.LMATCH:
cmpb $64,%al
jb .LM3MATCH
/* a M2 match */
movl %eax,%ecx
shrl $2,%eax
leal -1(%edi),%edx
#if defined(LZO1X)
andl $7,%eax
movb (%esi),%bl
shrl $5,%ecx
leal (%eax,%ebx,8),%eax
#elif defined(LZO1Y)
andl N_3,%eax
movb (%esi),%bl
shrl $4,%ecx
leal (%eax,%ebx,4),%eax
#endif
incl %esi
subl %eax,%edx
#if defined(LZO_FAST)
#if defined(LZO1X)
addl $1+3,%ecx
#elif defined(LZO1Y)
addl $2,%ecx
#endif
#else
#if defined(LZO1X)
incl %ecx
#elif defined(LZO1Y)
decl %ecx
#endif
#endif
cmpl N_3,%eax
jae .LCOPYLONG
jmp .LCOPYBYTE
/***********************************************************************
// M3
************************************************************************/
0: addl N_255,%eax
TEST_IP(3(%esi),%edx) /* minimum */
1: movb (%esi),%bl
incl %esi
orb %bl,%bl
jz 0b
leal 33+NN(%eax,%ebx),%ecx
xorl %eax,%eax
jmp 3f
ALIGN3
.LM3MATCH:
cmpb $32,%al
jb .LM4MATCH
/* a M3 match */
andl $31,%eax
jz 1b
lea 2+NN(%eax),%ecx
3:
#ifdef LZO_DEBUG
andl $0xffff0000,%eax ; jnz .L_assert_fail
#endif
movw (%esi),%ax
leal -1(%edi),%edx
shrl $2,%eax
addl $2,%esi
subl %eax,%edx
cmpl N_3,%eax
jb .LCOPYBYTE
/***********************************************************************
// copy match
************************************************************************/
ALIGN1
.LCOPYLONG: /* copy match using longwords */
TEST_LOOKBEHIND(%edx)
#if defined(LZO_FAST)
leal -3(%edi,%ecx),%eax
shrl $2,%ecx
TEST_OP_R(%eax)
COPYL(%edx,%edi,%ebx)
movl %eax,%edi
xorl %ebx,%ebx
#else
TEST_OP((%edi,%ecx),%eax)
movl %ecx,%ebx
shrl $2,%ebx
jz 2f
COPYL_C(%edx,%edi,%eax,%ebx)
andl N_3,%ecx
jz 1f
2: COPYB_C(%edx,%edi,%al,%ecx)
1:
#endif
.LMDONE:
movb -2(%esi),%al
andl N_3,%eax
jz .L00
.LFLR3:
TEST_OP((%edi,%eax),%edx)
TEST_IP((%esi,%eax),%edx)
#if defined(LZO_FAST)
movl (%esi),%edx
addl %eax,%esi
movl %edx,(%edi)
addl %eax,%edi
#else
COPYB_C(%esi,%edi,%cl,%eax)
#endif
#ifdef LZO_DEBUG
andl $0xffffff00,%eax ; jnz .L_assert_fail
andl $0xffffff00,%ebx ; jnz .L_assert_fail
xorl %eax,%eax ; xorl %ebx,%ebx
xorl %ecx,%ecx ; xorl %edx,%edx
#endif
LODSB
jmp .LMATCH
ALIGN3
.LCOPYBYTE: /* copy match using bytes */
TEST_LOOKBEHIND(%edx)
TEST_OP(-NN(%edi,%ecx),%eax)
xchgl %edx,%esi
#if defined(LZO_FAST)
subl N_3,%ecx
#endif
rep
movsb
movl %edx,%esi
jmp .LMDONE
/***********************************************************************
// M4
************************************************************************/
0: addl N_255,%ecx
TEST_IP(3(%esi),%edx) /* minimum */
1: movb (%esi),%bl
incl %esi
orb %bl,%bl
jz 0b
leal 9+NN(%ebx,%ecx),%ecx
jmp 3f
ALIGN3
.LM4MATCH:
cmpb $16,%al
jb .LM1MATCH
/* a M4 match */
movl %eax,%ecx
andl $8,%eax
shll $13,%eax /* save in bit 16 */
andl $7,%ecx
jz 1b
addl $2+NN,%ecx
3:
#ifdef LZO_DEBUG
movl %eax,%edx ; andl $0xfffe0000,%edx ; jnz .L_assert_fail
#endif
movw (%esi),%ax
addl $2,%esi
leal -0x4000(%edi),%edx
shrl $2,%eax
jz .LEOF
subl %eax,%edx
jmp .LCOPYLONG
/***********************************************************************
// M1
************************************************************************/
ALIGN3
.LM1MATCH:
/* a M1 match */
TEST_OP(2(%edi),%edx)
shrl $2,%eax
movb (%esi),%bl
leal -1(%edi),%edx
leal (%eax,%ebx,4),%eax
incl %esi
subl %eax,%edx
TEST_LOOKBEHIND(%edx)
movb (%edx),%al /* we must use this because edx can be edi-1 */
movb %al,(%edi)
movb 1(%edx),%bl
movb %bl,1(%edi)
addl $2,%edi
jmp .LMDONE
/***********************************************************************
//
************************************************************************/
.LEOF:
/**** xorl %eax,%eax eax=0 from above */
cmpl $3+NN,%ecx /* ecx must be 3/6 */
setnz %al
/* vim:set ts=4 sw=4 et: */
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