Wendell wrote:
> From Tony's explanation concerning moving the TR command to the data area
via LOCTR, can I surmise that it might be counter-productive to do so--that
leaving the TR and EX commands in consecutive memory is more efficient?
My $0.02 is that I'm not so sure about the "do it once with length of 1,
then do it for real with EX" approach, but what is mentioned in the Kevin
Shum paper that Tony referenced is that you want the target of the EX
instruction "close" to the EX itself, so that the target instruction might
already be in the i-cache and won't have to be fetched. I usually try to
place it like this:
SUBROUTINE_1 DS 0H
...
EX R2,EX_TARGET
...
BR R14
.
EX_TARGET MVC 0(*-*,R3),0(R4)
.
SUBROUTINE_2 DS 0H
... so that the EX target isn't in a data area, but is "close" to the EX
itself.
==========================
Adam Johanson
R&D Software Engineer
[email protected]
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