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...eral reg class, so a spilled Acc can be reloaded as a General. Previously, the RA would fail because it would spill X, but it couldn't reload X into an Acc. Now, with the patch, the DAG compiles into this: # store X to stack STX_stack [0] # transfer A to X TAX # load A from stack LDA_stack [0] # now that A and X are swapped, we can subtract! SUBidx A, X It works, but I'm not sure if I used the best approach. If you're familiar with the RA, feel free to look at the patch and leave feedback. - Nolan