On 2/17/2014 7:34 PM, Bernd Oppolzer wrote:
My question is: if we had such an instruction, how would this fit into the
overall machine concept? And: are there some performance benefits,
or are there some problems with this approach, which I do not see?
I'm sure, that some historical machines had such concepts ...
The IBM 704/709/709x machines had several SKIP instruction types
(Compare[one or two skips], Compare Logical[1 or 2 skips], Test Sense
Switch); using the latter I could create a print string (0/1 for 6
switches) with fourteen instructions. However, all instructions were the
same length, which avoided problems. On zOS machines you'd need to
specify the skip amount to make them usable in general, or use macros?
Gerhard Postpischil
Bradford, Vermont
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