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. -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/stella.html
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