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Subject: Re: [stella] some more optimization tips From: Jim Nitchals <jimn8@xxxxxxxxxx> Date: Fri, 8 May 1998 18:55:54 -0700 (PDT) |
>
> I can't figure a 2 byte non-destructive 5 cycle delay :(
>
> Of course, a destructive one is easy
>
> INC $80
If you've got a page-aligned pointer to some graphics data, or Y or X is
zero already, you can:
cmp (grafdata),y
or
cmp (grafdata,x)
It could be any other kind of pointer, as long as it's going to ROM and
preferably page-aligned.
You'll lose flags, but so do many other cycle-chewing tricks.
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