mirror of
https://github.com/emmanuel-marty/lzsa.git
synced 2024-12-22 16:30:01 +00:00
New faster and shorter decompressors
This update is mostly about better integration of improvements by uniabis, with spke contributing several smaller size optimizations.
This commit is contained in:
introspec
GitHub
parent
e7bb1faece
commit
44bff39de3
@ -1,5 +1,6 @@
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;
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; Speed-optimized LZSA2 decompressor by spke (v.1 02-07/06/2019 +patch1-30/07/2019, 213/211(hd64180) bytes)
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; Speed-optimized LZSA2 decompressor by spke (v.1 02-07/06/2019, 214 bytes);
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; with improvements by uniabis (30/07/2019, -5 bytes, +3% speed and support for Hitachi HD64180).
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;
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; The data must be compressed using the command line compressor by Emmanuel Marty
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; The compression is done as follows:
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@ -26,7 +27,7 @@
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;
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; (do not forget to uncomment the BACKWARD_DECOMPRESS option in the decompressor).
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;
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; Of course, LZSA2 compression algorithm is (c) 2019 Emmanuel Marty,
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; Of course, LZSA2 compression algorithms are (c) 2019 Emmanuel Marty,
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; see https://github.com/emmanuel-marty/lzsa for more information
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;
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; Drop me an email if you have any comments/ideas/suggestions: zxintrospec@gmail.com
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@ -47,23 +48,10 @@
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; misrepresented as being the original software.
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; 3. This notice may not be removed or altered from any source distribution.
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; DEFINE BACKWARD_DECOMPRESS
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; DEFINE BACKWARD_DECOMPRESS ; uncomment for data compressed with option -b
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; DEFINE HD64180 ; uncomment for systems using Hitachi HD64180
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IFDEF BACKWARD_DECOMPRESS
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MACRO NEXT_HL
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dec hl
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ENDM
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MACRO ADD_OFFSET
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push hl : or a : sbc hl,de : pop de
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ENDM
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MACRO BLOCKCOPY
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lddr
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ENDM
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ELSE
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IFNDEF BACKWARD_DECOMPRESS
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MACRO NEXT_HL
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inc hl
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@ -77,57 +65,57 @@
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ldir
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ENDM
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ELSE
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MACRO NEXT_HL
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dec hl
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ENDM
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MACRO ADD_OFFSET
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ex de,hl : ld a,e : sub l : ld l,a
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ld a,d : sbc h : ld h,a ; 4*4+3*4 = 28t / 7 bytes
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ENDM
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MACRO BLOCKCOPY
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lddr
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ENDM
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ENDIF
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IFDEF HD64180
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MACRO LD_IX_DE
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push de : pop ix
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ENDM
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MACRO LD_DE_IX
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push ix : pop de
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ENDM
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ELSE
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IFNDEF HD64180
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MACRO LD_IX_DE
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ld ixl,e : ld ixh,d
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ENDM
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MACRO LD_DE_IX
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ld e,ixl : ld d,ixh
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ENDM
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ELSE
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MACRO LD_IX_DE
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push de : pop ix
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ENDM
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MACRO LD_DE_IX
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push ix : pop de
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ENDM
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ENDIF
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@DecompressLZSA2:
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; A' stores next nibble as %1111.... or assumed to contain trash
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; B is assumed to be 0
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xor a : ld b,a : scf : exa : jr ReadToken
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ld b,0 : scf : exa : jr ReadToken
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LongerMatch: scf : exa : jr nc,.noUpdate
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ld a,(hl) : or #F0 : exa
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ld a,(hl) : NEXT_HL : or #0F
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rrca : rrca : rrca : rrca
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.noUpdate sub #F0-9 : cp 15+9 : jr c,CopyMatch
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;inc a : jr z,LongMatch : sub #F0-9+1 : jp CopyMatch
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LongMatch: ;ld a,24 :
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add (hl) : NEXT_HL : jr nc,CopyMatch
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ld c,(hl) : NEXT_HL
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ld b,(hl) : NEXT_HL
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jr nz,CopyMatch.useC
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pop de : ret
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ManyLiterals: ld a,18 :
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add (hl) : NEXT_HL : jr nc,CopyLiterals
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ManyLiterals: ld a,18 : add (hl) : NEXT_HL : jr nc,CopyLiterals
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ld c,(hl) : NEXT_HL
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ld a,b : ld b,(hl)
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jr ReadToken.useBC
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jr ReadToken.NEXTHLuseBC
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@ -142,18 +130,25 @@ MoreLiterals: ld b,(hl) : NEXT_HL
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.noUpdate ;sub #F0-3 : cp 15+3 : jr z,ManyLiterals
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inc a : jr z,ManyLiterals : sub #F0-3+1
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CopyLiterals: ld c,a
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.useC ld a,b : ld b,0
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.useBC BLOCKCOPY
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push de : or a : jp p,CASE0xx : jr CASE1xx
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CopyLiterals: ld c,a : ld a,b : ld b,0
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BLOCKCOPY
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push de : or a : jp p,CASE0xx ;: jr CASE1xx
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cp %11000000 : jr c,CASE10x
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CASE11x cp %11100000 : jr c,CASE110
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; "111": repeated offset
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CASE111: LD_DE_IX : jr MatchLen
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Literals0011: jr nz,MoreLiterals
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; if "LL" of the byte token is equal to 0,
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; there are no literals to copy
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NoLiterals: xor (hl) : NEXT_HL
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NoLiterals: or (hl) : NEXT_HL
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push de : jp m,CASE1xx
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; short (5 or 9 bit long) offsets
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@ -162,26 +157,25 @@ CASE0xx ld d,#FF : cp %01000000 : jr c,CASE00x
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; "01x": the case of the 9-bit offset
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CASE01x: cp %01100000 : rl d
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ReadOffsetE: ld e,(hl) : NEXT_HL
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ReadOffsetE ld e,(hl) : NEXT_HL
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SaveOffset: LD_IX_DE
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MatchLen: inc a : and %00000111 : jr z,LongerMatch : inc a
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CopyMatch: ld c,a
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.useC ex (sp),hl ; BC = len, DE = offset, HL = dest, SP ->[src]
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.useC ex (sp),hl ; BC = len, DE = offset, HL = dest, SP ->[dest,src]
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ADD_OFFSET ; BC = len, DE = dest, HL = dest-offset, SP->[src]
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BLOCKCOPY : pop hl
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; compressed data stream contains records
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; each record begins with the byte token "XYZ|LL|MMM"
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ReadToken: ld a,(hl) : and %00011000 : jr z,NoLiterals
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ReadToken: ld a,(hl) : and %00011000 : jp pe,Literals0011 ; process the cases 00 and 11 separately
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jp pe,MoreLiterals ; 00 has already been processed; this identifies the case of 11
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rrca : rrca : rrca
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ld c,a : ld a,(hl) ; token is re-read for further processing
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.useBC NEXT_HL
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.NEXTHLuseBC NEXT_HL
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BLOCKCOPY
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; the token and literals are followed by the offset
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@ -190,8 +184,7 @@ ReadToken: ld a,(hl) : and %00011000 : jr z,NoLiterals
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CASE1xx cp %11000000 : jr nc,CASE11x
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; "10x": the case of the 5-bit offset
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CASE10x: ld c,a
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exa : jr nc,.noUpdate
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CASE10x: ld c,a : exa : jr nc,.noUpdate
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ld a,(hl) : or #F0 : exa
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ld a,(hl) : NEXT_HL : or #0F
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@ -201,29 +194,42 @@ CASE10x: ld c,a
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cp %10100000 : rl d
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dec d : dec d : jr ReadOffsetE
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; "00x": the case of the 5-bit offset
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CASE00x: ld c,a
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exa : jr nc,.noUpdate
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ld a,(hl) : or #F0 : exa
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ld a,(hl) : NEXT_HL : or #0F
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rrca : rrca : rrca : rrca
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.noUpdate ld e,a : ld a,c
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cp %00100000 : rl e : jp SaveOffset
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; two remaining cases
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CASE11x cp %11100000 : jr c,CASE110
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; "111": repeated offset
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CASE111: LD_DE_IX : jr MatchLen
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; "110": 16-bit offset
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CASE110: ld d,(hl) : NEXT_HL : jr ReadOffsetE
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; "00x": the case of the 5-bit offset
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CASE00x: ld c,a : exa : jr nc,.noUpdate
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ld a,(hl) : or #F0 : exa
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ld a,(hl) : NEXT_HL : or #0F
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rrca : rrca : rrca : rrca
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.noUpdate ld e,a : ld a,c
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cp %00100000 : rl e : jr SaveOffset
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LongerMatch: scf : exa : jr nc,.noUpdate
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ld a,(hl) : or #F0 : exa
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ld a,(hl) : NEXT_HL : or #0F
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rrca : rrca : rrca : rrca
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.noUpdate sub #F0-9 : cp 15+9 : jr c,CopyMatch
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LongMatch: add (hl) : NEXT_HL : jr nc,CopyMatch
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ld c,(hl) : NEXT_HL
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ld b,(hl) : NEXT_HL : jr nz,CopyMatch.useC
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pop de : ret
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@ -1,5 +1,6 @@
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;
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; Size-optimized LZSA2 decompressor by spke (v.1 02-09/06/2019 +patch1-30/07/2019, 144 bytes)
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; Size-optimized LZSA2 decompressor by spke (v.1 02-09/06/2019, 140 bytes);
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; with improvements by uniabis (30/07/2019, -1 byte, +3% speed and support for Hitachi HD64180).
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;
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; The data must be compressed using the command line compressor by Emmanuel Marty
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; The compression is done as follows:
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@ -26,7 +27,7 @@
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;
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; (do not forget to uncomment the BACKWARD_DECOMPRESS option in the decompressor).
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;
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; Of course, LZSA2 compression algorithm is (c) 2019 Emmanuel Marty,
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; Of course, LZSA2 compression algorithms are (c) 2019 Emmanuel Marty,
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; see https://github.com/emmanuel-marty/lzsa for more information
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;
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; Drop me an email if you have any comments/ideas/suggestions: zxintrospec@gmail.com
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@ -48,23 +49,10 @@
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; 3. This notice may not be removed or altered from any source distribution.
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;
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; DEFINE BACKWARD_DECOMPRESS
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; DEFINE BACKWARD_DECOMPRESS ; uncomment for data compressed with option -b
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; DEFINE HD64180 ; uncomment for systems using Hitachi HD64180
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IFDEF BACKWARD_DECOMPRESS
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MACRO NEXT_HL
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dec hl
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ENDM
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MACRO ADD_OFFSET
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push hl : or a : sbc hl,de : pop de
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ENDM
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MACRO BLOCKCOPY
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lddr
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ENDM
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ELSE
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IFNDEF BACKWARD_DECOMPRESS
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MACRO NEXT_HL
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inc hl
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@ -78,58 +66,68 @@
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ldir
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ENDM
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ELSE
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MACRO NEXT_HL
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dec hl
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ENDM
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MACRO ADD_OFFSET
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push hl : or a : sbc hl,de : pop de ; 11+4+15+10 = 40t / 5 bytes
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ENDM
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MACRO BLOCKCOPY
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lddr
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ENDM
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ENDIF
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IFDEF HD64180
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IFNDEF HD64180
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MACRO LD_IY_DE
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ld iyl,e : ld iyh,d
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ENDM
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MACRO LD_DE_IY
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ld e,iyl : ld d,iyh
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ENDM
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ELSE
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MACRO LD_IY_DE
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push de : pop iy
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ENDM
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MACRO LD_DE_IY
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push iy : pop de
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ENDM
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MACRO LD_IXL_A
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exx : ld l,a : exx
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ENDM
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MACRO LD_A_IXL
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exx : ld a,l : exx
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ENDM
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ELSE
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MACRO LD_IY_DE
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;push de : pop iy
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ld iyl,e : ld iyh,d
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ENDM
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MACRO LD_DE_IY
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;push iy : pop de
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ld e,iyl : ld d,iyh
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ENDM
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MACRO LD_IXL_A
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ld ixl,a
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ENDM
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MACRO LD_A_IXL
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ld a,ixl
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ENDM
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ENDIF
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ENDIF
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@DecompressLZSA2:
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xor a : ld b,a : exa : jr ReadToken
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CASE00x: call ReadNibble
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ld e,a : ld a,c
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cp %00100000 : rl e : jr SaveOffset
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CASE0xx ld d,#FF : cp %01000000 : jr c,CASE00x
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CASE01x: cp %01100000 : rl d
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OffsetReadE: ld e,(hl) : NEXT_HL
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SaveOffset: LD_IY_DE
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MatchLen: and %00000111 : add 2 : cp 9 : call z,ExtendedCode
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CopyMatch: ld c,a
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ex (sp),hl ; BC = len, DE = offset, HL = dest, SP ->[src]
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ADD_OFFSET ; BC = len, DE = dest, HL = dest-offset, SP->[src]
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BLOCKCOPY : pop hl
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ex (sp),hl ; BC = len, DE = -offset, HL = dest, SP -> [src]
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ADD_OFFSET ; BC = len, DE = dest, HL = dest+(-offset), SP -> [src]
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BLOCKCOPY ; BC = 0, DE = dest
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pop hl ; HL = src
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ReadToken: ld a,(hl) : LD_IXL_A : NEXT_HL
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ReadToken: ld a,(hl) : NEXT_HL : push af
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and %00011000 : jr z,NoLiterals
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rrca : rrca : rrca
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@ -138,7 +136,7 @@ ReadToken: ld a,(hl) : LD_IXL_A : NEXT_HL
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ld c,a
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BLOCKCOPY
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NoLiterals: push de : LD_A_IXL
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NoLiterals: pop af : push de
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or a : jp p,CASE0xx
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CASE1xx cp %11000000 : jr nc,CASE11x
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@ -146,24 +144,20 @@ CASE1xx cp %11000000 : jr nc,CASE11x
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CASE10x: call ReadNibble
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ld d,a : ld a,c
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cp %10100000 : rl d
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dec d : dec d : jr OffsetReadE
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dec d : dec d : DB #CA ; jr OffsetReadE ; #CA is JP Z,.. to skip all commands in CASE110 before jr OffsetReadE
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CASE00x: call ReadNibble
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ld e,a : ld a,c
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cp %00100000 : rl e : jr SaveOffset
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CASE110: ld d,(hl) : NEXT_HL : jr OffsetReadE
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CASE11x cp %11100000 : jr c,CASE110
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CASE111: LD_DE_IY : jr MatchLen
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CASE110: ld d,(hl) : NEXT_HL : jr OffsetReadE
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ExtendedCode: call ReadNibble : inc a : jr z,ExtraByte
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sub #F0+1 : add c : ret
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ExtraByte ld a,15 : add c : add (hl) : NEXT_HL : ret nc
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ld a,(hl) : NEXT_HL
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ld b,(hl) : NEXT_HL : ret nz
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pop de : pop de : ret
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pop de : pop de ; RET is not needed, because RET from ReadNibble is sufficient
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ReadNibble: ld c,a : xor a : exa : ret m
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UpdateNibble ld a,(hl) : or #F0 : exa
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Block a user