1 /* lzo1c_d.ash -- assembler implementation of the LZO1C decompression algorithm 2 3 This file is part of the LZO real-time data compression library. 4 5 Copyright (C) 1996-2014 Markus Franz Xaver Johannes Oberhumer 6 All Rights Reserved. 7 8 The LZO library is free software; you can redistribute it and/or 9 modify it under the terms of the GNU General Public License as 10 published by the Free Software Foundation; either version 2 of 11 the License, or (at your option) any later version. 12 13 The LZO library is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with the LZO library; see the file COPYING. 20 If not, write to the Free Software Foundation, Inc., 21 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 22 23 Markus F.X.J. Oberhumer 24 <markus (at) oberhumer.com> 25 http://www.oberhumer.com/opensource/lzo/ 26 */ 27 28 29 /*********************************************************************** 30 // 31 ************************************************************************/ 32 33 ALIGN3 34 .L1: 35 xorl %eax,%eax 36 movb (%esi),%al 37 incl %esi 38 cmpb $32,%al 39 jnb .LMATCH 40 41 orb %al,%al 42 jz .L12 43 movl %eax,%ecx 44 .LIT: 45 TEST_OP((%edi,%ecx),%ebx) 46 TEST_IP((%esi,%ecx),%ebx) 47 rep 48 movsb 49 .LM1: 50 movb (%esi),%al 51 incl %esi 52 53 cmpb $32,%al 54 jb .LM2 55 .LMATCH: 56 cmpb $64,%al 57 jb .LN3 58 59 movl %eax,%ecx 60 andb $31,%al 61 leal -1(%edi),%edx 62 shrl $5,%ecx 63 subl %eax,%edx 64 movb (%esi),%al 65 incl %esi 66 67 shll $5,%eax 68 subl %eax,%edx 69 incl %ecx 70 xchgl %esi,%edx 71 TEST_LOOKBEHIND(%esi) 72 TEST_OP((%edi,%ecx),%ebx) 73 rep 74 movsb 75 movl %edx,%esi 76 jmp .L1 77 78 ALIGN3 79 .L12: 80 LODSB 81 leal 32(%eax),%ecx 82 cmpb $248,%al 83 jb .LIT 84 85 movl $280,%ecx 86 subb $248,%al 87 jz .L11 88 xchgl %eax,%ecx 89 xorb %al,%al 90 shll %cl,%eax 91 xchgl %eax,%ecx 92 .L11: 93 TEST_OP((%edi,%ecx),%ebx) 94 TEST_IP((%esi,%ecx),%ebx) 95 rep 96 movsb 97 jmp .L1 98 99 ALIGN3 100 .LM2: 101 leal -1(%edi),%edx 102 subl %eax,%edx 103 LODSB 104 shll $5,%eax 105 subl %eax,%edx 106 xchgl %esi,%edx 107 TEST_LOOKBEHIND(%esi) 108 TEST_OP(4(%edi),%ebx) 109 movsb 110 movsb 111 movsb 112 movl %edx,%esi 113 movsb 114 xorl %eax,%eax 115 jmp .LM1 116 .LN3: 117 andb $31,%al 118 movl %eax,%ecx 119 jnz .LN6 120 movb $31,%cl 121 .LN4: 122 LODSB 123 orb %al,%al 124 jnz .LN5 125 addl N_255,%ecx 126 jmp .LN4 127 128 ALIGN3 129 .LN5: 130 addl %eax,%ecx 131 .LN6: 132 movb (%esi),%al 133 incl %esi 134 135 movl %eax,%ebx 136 andb $63,%al 137 movl %edi,%edx 138 subl %eax,%edx 139 140 movb (%esi),%al 141 incl %esi 142 143 shll $6,%eax 144 subl %eax,%edx 145 cmpl %edi,%edx 146 jz .LEOF 147 148 xchgl %edx,%esi 149 leal 3(%ecx),%ecx 150 TEST_LOOKBEHIND(%esi) 151 TEST_OP((%edi,%ecx),%eax) 152 rep 153 movsb 154 155 movl %edx,%esi 156 xorl %eax,%eax 157 shrl $6,%ebx 158 movl %ebx,%ecx 159 jnz .LIT 160 jmp .L1 161 162 .LEOF: 163 /**** xorl %eax,%eax eax=0 from above */ 164 165 cmpl $1,%ecx /* ecx must be 1 */ 166 setnz %al 167 168 169 /* 170 vi:ts=4 171 */ 172 173
