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; bits.ash -- bit access for decompression
;
; This file is part of the UCL data compression library.
;
; Copyright (C) 1996-2004 Markus Franz Xaver Johannes Oberhumer
; All Rights Reserved.
;
; The UCL 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 UCL 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 UCL library; see the file COPYING.
; If not, write to the Free Software Foundation, Inc.,
; 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;
; Markus F.X.J. Oberhumer
; <markus@oberhumer.com>
; http://www.oberhumer.com/opensource/ucl/
;
; ------------- ADDBITS -------------
macro(ADDBITS)
#if (NRV_BB == 8)
add.b d0,d0 ; sets Z, C and X ; 4
#elif (NRV_BB == 32)
add.l d0,d0 ; sets Z, C and X ; 6
#endif
endm
#if 0
macro(ADDXBITS)
#if (NRV_BB == 8)
addx.b d0,d0 ; sets C and X ; 4
#elif (NRV_BB == 32)
addx.l d0,d0 ; sets C and X ; 8
#endif
endm
#endif
; ------------- FILLBYTES_xx -------------
; get 1 byte; then get 1 bit into both C and X
macro(FILLBYTES_8)
; note: we shift the X flag through -> must init d0.b with $80
move.b (a0)+,d0 ; 8
addx.b d0,d0 ; sets C and X ; 4
endm
; get 32 bits in little endian format; then get 1 bit into both C and X
macro(FILLBYTES_LE32)
#if 0
move.b (a0)+,d0 ; 8
ror.l #8,d0 ; 24
move.b (a0)+,d0 ; 8
ror.l #8,d0 ; 24
move.b (a0)+,d0 ; 8
ror.l #8,d0 ; 24
move.b (a0)+,d0 ; 8
ror.l #8,d0 ; 24
add.l d0,d0 ; sets C and X ; 6
bset #0,d0 ; only changes Z ; 12
; -----
; 146
#elif 1
move.b 3(a0),d0 ; 12
lsl.w #8,d0 ; 22
move.b 2(a0),d0 ; 12
swap d0 ; 4
move.b 1(a0),d0 ; 12
lsl.w #8,d0 ; 22
move.b (a0),d0 ; 8
addq.l #4,a0 ; does not affect flags ; 8
add.l d0,d0 ; sets C and X ; 6
bset #0,d0 ; only changes Z ; 12
; -----
; 118
#else
; IMPORTANT: movep is not implemented on the 68060
# error "do not use movep"
; note: we shift the X flag through -> must init d0.l with $80000000
; note: must use dc.l because of a bug in the pasm assembler
; note: may access past the end of the input; this is ok for UPX
dc.l $01080003 ; movep.w 3(a0),d0 ; 16
move.b 2(a0),d0 ; 12
swap d0 ; 4
dc.l $01080001 ; movep.w 1(a0),d0 ; 16
move.b (a0),d0 ; 8
addq.l #4,a0 ; does not affect flags ; 8
addx.l d0,d0 ; sets C and X ; 8
; -----
; 72
#endif
endm
; ------------- FILLBITS -------------
macro(FILLBITS)
#if (NRV_BB == 8)
; no need for a subroutine
FILLBYTES_8
#elif (NRV_BB == 32)
# ifdef SMALL
# define FILLBYTES_SR FILLBYTES_LE32
bsr fillbytes_sr ; 18
# else
FILLBYTES_LE32
# endif
#endif
endm
; ------------- GETBIT -------------
; get one bit into both the Carry and eXtended flag
macro(GETBIT)
#if defined(__A68K__)
ADDBITS ; 4 / 6
bne \@ ; 10 (if jump)
FILLBITS
\@:
#elif defined(__ASL__)
ADDBITS ; 4 / 6
bne done ; 10 (if jump)
FILLBITS
done:
#else
LOCAL done
ADDBITS ; 4 / 6
bne done ; 10 (if jump)
FILLBITS
done:
#endif
endm
; vi:ts=8:et
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