Re: Predict register usage

andreybokhanko@gmail.com
Fri, 2 May 2008 00:33:54 -0700 (PDT)

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From: andreybokhanko@gmail.com
Newsgroups: comp.compilers
Date: Fri, 2 May 2008 00:33:54 -0700 (PDT)
Organization: Compilers Central
References: 08-04-093
Keywords: registers, optimize
Posted-Date: 03 May 2008 17:44:23 EDT

My practical experience suggests that if you have a proper optimizing
compiler with lots of phases, you *can't* predict effects of inlining
on register allocation. There are too many phases between -- many of
them able to radically impact register allocation. You can't predict
all these phases.


I saw cases when a single additional strength reduction blew up
register allocation.


Andrey


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