> On current hardware there is an IILF (LFI) instruction, and I would like to
>> use it instead of the XR/ICM sequence.
Before using any modern instructions, ask yourself if they are worth the risk.
Does your disaster recovery site guarantee this as a minimum machine level.
Maybe your employer has older machines available in case of capacity problems.
How about company acquisition. You need to consider the impact.
>Back in he Assembler XF era I would code something like
> LA R0,L'DEST
> LA R1,DEST
> XR R15,R15
> ICM R15,8,=C' '
> MVCL R0,R14
Why use LFI when better alternatives for ICM =C' ' have been around forever.
J bydata
data dc A(X'40000000',0,L'dest)
bydata LM R15,R1,data
Since the J instruction only updates the PSW, I'm guessing it will replace the
update PSW in the previous instruction thus making this a single instruction on
current hardware but still compatible with older hardware.
Alternatively, there is the NILH instruction which has existed for a couple
decades.
