In <[email protected]>, on 07/18/2011
at 11:58 AM, Edward Jaffe <[email protected]> said:
>If the target AMODE guessed by the hardware is wrong, then it will
>have to start over again fetching and interpreting the instructions
>in the correct AMODE.
Are you saying that the processor starts fetching instructions for the
branch prior to executing it? I would expect the processor to only be
reading ahead from the locations following the branch until it was
ready to perform the branch. Of course, there are techniques to
execute a branch out of sequence, but I see no reason that the AMODE
wouldn't be handled as part of that.
Could one of the IBM processor people comment?
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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