Bill Fairchild wrote:
Right. There is no difference in difficulty. My point was that if the needed zap involves changing a constant of 4095 to 4096, then you can't do it by zapping a 12-bit displacement in a LA instruction but you can do it if affected instruction is using a halfword, either as a literal or named.
Except for the problem I mentioned earlier that a literal can be referenced by more than one instruction. I prefer to always use immediate instructions when possible. (They run a lot faster!) In any case, all of the instructions under discussion are four bytes long, which means you can convert them to BAS/BRAS into the patch area if you need to do something more exotic/difficult than what a zap to the instruction allows.
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