Register windows (was: The Third Wish)

From	Stefan Monnier <monnier@iro.umontreal.ca>
Newsgroups	comp.arch
Subject	Register windows (was: The Third Wish)
Date	2025-07-17 12:20 -0400
Organization	A noiseless patient Spider
Message-ID	<jwvldomkdua.fsf-monnier+comp.arch@gnu.org> (permalink)
References	(16 earlier) <1059reg$1652n$1@dont-email.me> <1059sj8$16a8p$1@dont-email.me> <1059t3a$16euf$1@dont-email.me> <1059tti$16il5$1@dont-email.me> <f19813b55e635188c81f989aa63f0462@www.novabbs.org>

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> The only good arguments I have heard wrt big architectural register
> files has to do with things like Register-Windows and/or optimizing
> CALL/RET interface.

But even there, it justifies only additional "second-class registers",
i.e. where the set of immediately addressable registers can still be the
same size as usual (e.g. 16 or 32), but you can quickly push some of
those to some kind of "stack" and then pull them back in.
IIRC the Mill had actually 2 categories of "second-class registers":
the stack and the scratch registers.

I think you can get similar benefits with "cache-line sized" memory
operations that load/store several registers at a time (assuming you
have good enough store-to-load forwarding).  Or even fold those
loads&stores into some kind of CALL/RET instructions, which can let you
start the control-flow part of the CALL before the stores, and similarly
start the loads before the control flow part of the RET is done.


        Stefan

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  The Third Wish quadibloc <quadibloc@gmail.com> - 2025-06-23 12:43 +0000
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