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