Re: Register windows

From	Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups	comp.arch
Subject	Re: Register windows
Date	2025-07-17 16:18 -0400
Organization	A noiseless patient Spider
Message-ID	<jwvh5zainf6.fsf-monnier+comp.arch@gnu.org> (permalink)
References	(9 earlier) <1059tti$16il5$1@dont-email.me> <f19813b55e635188c81f989aa63f0462@www.novabbs.org> <jwvldomkdua.fsf-monnier+comp.arch@gnu.org> <2025Jul17.193835@mips.complang.tuwien.ac.at> <6a7f2d4cbc31d5089477f3fbb6de2f3a@www.novabbs.org>

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>> Not efficiently.  You would have to wait until the last instruction
>> has written back its result, then make the switch, and only then start
>> reading registers from instructions behind the SAVE/RESTORE
>> instruction.
>
> What you write is INVARIABLY true if SW is the one that has to do
> this work.  The previous value has to leave the register before the
> new value arrives to be written.

With register renaming that is not a requirement any more: the new value
is sent to another physical register.
I'm pretty sure you know that, so I wonder what it is that you meant.


        Stefan

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