Posted By
Mad
on 2022-06-01
08:28:39
|  Re: cc65 compressor too slow: help needed optimizing
I cannot help you.. All three suggestions above can copy changing numbers of bytes (the amount is in the x register at start).. But anyhow have fun..
lda #$00 ; somewhere at program init
sta $f0 ; somewhere at program init
copyBytes:
lda rtstablehi,x
sta $f1
ldy rtstablelo,x
lda #OPCODE_RTS
sta ($f0),y ; places an rts in the unrolled part
jsr loop
lda #OPCODE_LDA_ABS
sta ($f0),y ; removes the rts in the unrolled part again
rts
unrolledPart
"\ttlda\t_vo3_cur+0\n"
"\tsta\t_vo3_best+0\n"
"\ttlda\t_vo3_cur+1\n"
"\tsta\t_vo3_best+1\n"
"\ttlda\t_vo3_cur+2\n"
"\tsta\t_vo3_best+2\n"
"\ttlda\t_vo3_cur+3\n"
"\tsta\t_vo3_best+3\n"
"\ttlda\t_vo3_cur+4\n"
"\tsta\t_vo3_best+4\n"
..
"\ttlda\t_vo3_cur+255\n"
"\tsta\t_vo3_best+255\n"
rts ; if you want to copy all 256 values this byte needs to be here
Just to clarify that..
edit: BTW sorry, you do a compression programm, unrolling maybe is not an option then (because of program size :) )..
edit2 :) :
lda jmptablo,x
sta j + 1
lda jmptabhi,x
sta j + 2
j: jmp unrolledPart
unrolledPart:
"\ttlda\t_vo3_cur+255\n"
"\tsta\t_vo3_best+255\n"
"\ttlda\t_vo3_cur+254\n"
"\tsta\t_vo3_best+254\n"
..
"\ttlda\t_vo3_cur+0\n"
"\tsta\t_vo3_best+0\n"
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