László Molnár
204 lines
4.7 KiB
Plaintext
204 lines
4.7 KiB
Plaintext
/*
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; bits.ash -- bit access for decompression
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;
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; This file is part of the UCL data compression library.
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;
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; Copyright (C) 1996-2006 Markus Franz Xaver Johannes Oberhumer
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; All Rights Reserved.
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;
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; The UCL library is free software; you can redistribute it and/or
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; modify it under the terms of the GNU General Public License as
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; published by the Free Software Foundation; either version 2 of
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; the License, or (at your option) any later version.
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;
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; The UCL library is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with the UCL library; see the file COPYING.
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; If not, write to the Free Software Foundation, Inc.,
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; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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;
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; Markus F.X.J. Oberhumer Jens Medoch
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; <markus@oberhumer.com> <jssg@users.sourceforge.net>
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; http://www.oberhumer.com/opensource/ucl/
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;
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*/
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#ifndef _MR3K_STD_CONF_
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#define _MR3K_STD_CONF_
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//////////////////////////////////////
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// register defines
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//////////////////////////////////////
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#define src a0
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#define dst a2
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#define src_ilen t0
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#define bb t1
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#define ilen t2
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#define last_m_off t3
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#define m_len t4
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#define bc t5
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#define var v0
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#define m_off v1
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#define m_pos v1
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//////////////////////////////////////
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// optimized branch macros
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//////////////////////////////////////
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.macro beqz2gb reg,label,nrv_bb
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IF (!small) && (\nrv_bb == 8)
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beqz \reg,\label+4
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andi var,bb,0x007F
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ELSE
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beqz \reg,\label
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nop
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ENDIF
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.endm
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.macro b2gb label,nrv_bb
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IF (!small)
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b \label+4
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IF (\nrv_bb == 8)
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andi var,bb,0x007F
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ELSE // ;(nrv_bb == 32)
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addiu bc,-1
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ENDIF
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ELSE
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b \label
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nop
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ENDIF
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.endm
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//////////////////////////////////////
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// ucl memcpy
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//////////////////////////////////////
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.macro uclmcpy retoffset,nrv_bb
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local wordchk, prepbytecpy, bytecopy
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# ifdef FAST
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slti var,m_off,4
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bnez var,prepbytecpy
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addiu m_len,1
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subu m_pos,dst,m_off
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wordchk:
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slti var,m_len,4
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bnez var,bytecopy+4
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lwr var,0(m_pos)
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lwl var,3(m_pos)
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addiu m_len,-4
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swr var,0(dst)
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swl var,3(dst)
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addiu m_pos,4
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bnez m_len,wordchk
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addiu dst,4
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b2gb \retoffset,\nrv_bb
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prepbytecpy:
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# else
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addiu m_len,1
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# endif
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subu m_pos,dst,m_off
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bytecopy:
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lbu var,0(m_pos)
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addiu m_len,-1
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sb var,0(dst)
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addiu m_pos,1
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bnez m_len,bytecopy
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addiu dst,1
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b2gb \retoffset,\nrv_bb
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.endm
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//////////////////////////////////////
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// init decompressor
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//////////////////////////////////////
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.macro init nrv_bb
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move bb,zero
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IF (\nrv_bb == 32)
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move bc,bb
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ENDIF
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li last_m_off,1
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move src_ilen,src
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.endm
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#ifndef LOCLABELHACK
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# define LOCLABELHACK 0
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#else
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# undef __LL
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#
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#endif
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//////////////////////////////////////
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// 32bit getbit macro
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//////////////////////////////////////
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.macro gbit_le32
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local .L1
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IF (!small)
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addiu bc,-1
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ENDIF
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bgez bc,.L1
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srlv var,bb,bc
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li bc,31
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lwr bb,0(src_ilen)
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lwl bb,3(src_ilen)
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addiu src_ilen,4
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srlv var,bb,bc
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.L1:
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IF (small)
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jr ra
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ENDIF
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andi var,0x0001
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.endm
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//////////////////////////////////////
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// 8bit getbit macro
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//////////////////////////////////////
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.macro gbit_8
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local .L2
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IF (!small)
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andi var,bb,0x007F
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ENDIF
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bnez var,.L2
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sll bb,1
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lbu var,0(src_ilen)
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addiu src_ilen,1
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sll var,1
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addiu bb,var,1
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.L2:
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srl var,bb,8
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IF (small)
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jr ra
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ENDIF
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andi var,0x0001
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.endm
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//////////////////////////////////////
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// getbit call macro for small version
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//////////////////////////////////////
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.macro gbit_call subroutine,nrv_bb
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bal \subroutine
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IF (\nrv_bb == 8)
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andi var,bb,0x007F
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ELSE
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addiu bc,-1
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ENDIF
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.endm
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#endif //_MR3K_STD_CONF_
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