6502/lzsa
1
0
Fork 0
mirror of https://github.com/emmanuel-marty/lzsa.git synced 2025-02-16 17:30:44 +00:00
Code Issues Projects Releases Wiki Activity

Save 3 more bytes

Browse Source
This commit is contained in:
Emmanuel Marty 2019-06-08 23:59:34 +02:00 committed by GitHub
parent aab82fa022
commit 435e157239
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
asm/6502/decompress_v1.asm
View File

@ -28,8 +28,7 @@
; 3. This notice may not be removed or altered from any source distribution.
; -----------------------------------------------------------------------------
OFFSLO = $43 ; zero-page location for temp offset
OFFSHI = $44
OFFSHI = $43 ; zero-page location for temp offset
DECOMPRESS_LZSA1
LDY #$00
@ -117,12 +116,11 @@ GETMATCH_DONE
GET_LONG_OFFSET ; handle 16 bit offset:
JSR GETLARGESRC ; grab low 8 bits in X, high 8 bits in A
STX OFFSLO ; store final match offset
STA OFFSHI
STA OFFSHI ; store high 8 bits of offset
TXA
CLC ; add dest + match offset
LDA PUTDST+1 ; low 8 bits
ADC OFFSLO
ADC PUTDST+1 ; low 8 bits
STA COPY_MATCH_LOOP+1 ; store back reference address
LDA OFFSHI ; high 8 bits