> It is not clear to me that the first is less error prone,
> especially when the program is modified later. Either of
> these eats up another register to be used as an index.
> Unless the value of register 1 is set in close proximity to
> the LA, I would find the code to be confusing. And if it is
> set immediately before the LA, you could also code:
>
> LHI R1,-4
> LA R3,0(R1,R2)
>
> A better solution (IMO) is:
>
> LR R3,R2
> AHI R3,-4
Or in this day and age:
LAY R3,-4(,R2)
Which does what it says: load R3 with the address in R2 minus 4 bytes.
Fred!
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