Subject: Re: [stella] Death Derby optimizations From: Dennis Debro <ddebro@xxxxxxxxxxxxx> Date: Thu, 15 Jan 2004 15:36:14 -0500 |
Hi Glenn, > Actually, I am very interested in optimizations. I've been trying to do > quite a bit since the last build I sent to the list. Hmmm...just looking at the surface you could move your initialization to a lookup table. This could save you a few bytes. This is if you're flexable in moving your variables around. I also see some opportunities for some unconditional branches. You could change .ramp_up_initialize_pitch LDA #31 sta AUD0_Last_Pitch,X jmp .ramp_up_register to .ramp_up_initialize_pitch LDA #31 sta AUD0_Last_Pitch,X bne .ramp_up_register to save a byte. You can also change... .delta_Y_negative lda #1 sta Overlay1;flag for negative JMP .continue_Y_Accelerate .delta_Y_positive lda #0 sta Overlay1;flag for positive to .delta_Y_negative lda #1 BIT_W ;.byte $2C .delta_Y_positive lda #0 sta Overlay1;flag for positive which will save you 5 bytes. Also you could remove the jsr's in your mainloop. This could save you 18 bytes and stack RAM. There's really no need to have these even though I know a lot of us use them. I guess you could have them if you don't need the space but if you're fighting for *every* ROM byte I'd get rid of them. I hope this little bit helped. Taking these suggestions should help a little as there are a number of places this could help. Of course there are more tricks that can be done ;-) Take care, Dennis ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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