Re: SPARC code generation references

preston@ariel.rice.edu (Preston Briggs)
Tue, 28 May 91 14:27:44 GMT

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Newsgroups: comp.compilers
From: preston@ariel.rice.edu (Preston Briggs)
Keywords: SPARC, optimize
Organization: Rice University, Houston
References: 91-05-100 91-05-101
Date: Tue, 28 May 91 14:27:44 GMT

>Oddly enough, a day or two before this appeared I was talking to John Gilmore
>and Sean Fagan about this very issue.
...
> Move save and restore instructions `inward', renumbering
> registers, until they `bump into' call instructions or until
> the registers do not fit in the free %o set. (Then move the
...
>This technique might be called `leaf crushing' (I wanted to call it `leaf
>burning' but that was a bit too much of a stretch :-) ).


Nevertheless, it's already been done as part of the MIPS compiler.
It's called "shrink wrapping" and is described in Chow's 1988 paper


Minimizing Register Usage at Procedure Calls
by Fred Chow
in Proceedings of the Sigplan 88 Conference on Programming
Language Design and Implementation
pages 85-94
published as Siplan Notices, Volume 23, Number 7
July 1988


See section 5, "Shrink-wrapping Callee-saved Registers".


Preston Briggs
--

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