| /* lzo1x_d.ash -- assembler implementation of the LZO1X decompression algorithm |
| |
| This file is part of the LZO real-time data compression library. |
| |
| Copyright (C) 1996-2014 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 |
| |
| |
| /* |
| vi:ts=4 |
| */ |
| |
