Re: Register pressure and inlining

Jeremy Wright <jeremy.wright@microfocus.com>
Sun, 9 Nov 2008 12:30:37 +0000 (UTC)

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From: Jeremy Wright <jeremy.wright@microfocus.com>
Newsgroups: comp.compilers
Date: Sun, 9 Nov 2008 12:30:37 +0000 (UTC)
Organization: Compilers Central
References: 08-11-036
Keywords: registers, optimize
Posted-Date: 09 Nov 2008 12:46:54 EST

I can think of two ways extra spilling could occur.


Firstly - in a more complex example, your spill code might not be
optimally placed. In particular your spiller might not be
sophisticated enough to do live range splitting, and put the spill
code in the same place that the register save and restores would have
been originally.


Secondly - the compiler might (and probably should) do extra optimisation
passes after inlining. This could lead to further redundancy elimination
due to the improved information, which would then lead to extra register
pressure.


Jeremy Wright
Compiler Team Leader
Micro Focus


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