> LH R1,=H'-4096'
> USING -4096,R1
> LA R2,*
> LA R3,-4(,R2)
>
> What does R3 now address?
>
> This caused a great deal of debate on this list several years
> ago. Very few contributors got it right.
I would assume that the last LA would just add 0000FFFC to the contents of R2.
But the contents of R2 seem undefined; we need more information. I cheated and
tried to assemble your code. It needs a base register to address the literal.
It then uses that same register to assemble "LA R2,*" and all the R1 stuff
isn't used anymore. If I change the code to...
LHI R1,-4096
USING -4096,R1
LA R2,*
LA R3,-4(,R2)
...to get rid off the base register requirement it doesn't assemble anymore:
000000 A718 F000 FFF000 21 LHI R1,-4096
R:1 FFF000 22 USING -4096,R1
000004 0000 0000 00000 23 LA R2,*
** ASMA307E No active USING for operand *
** ASMA435I Record 5 in NMBTEST.FQ.SRC(TEST) on volume: T0P007
000008 4130 2FFC FFFFFC 24 LA R3,-4(,R2)
So it all seems to depend on the active usings that aren't specified in the
original question....
Fred!
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