[cfe-dev] NormalInlining pass run only at > O1
Roman Divacky
rdivacky at freebsd.org
Tue Mar 8 10:31:21 PST 2011
On Tue, Mar 08, 2011 at 09:33:38AM -0800, Chris Lattner wrote:
>
> On Mar 8, 2011, at 9:09 AM, Roman Divacky wrote:
>
> > hi,
> >
> > there's this code in CompilerInvocation.cpp:
> >
> >
> > Opts.Inlining = (Opts.OptimizationLevel > 1) ? CodeGenOptions::NormalInlining
> > : CodeGenOptions::OnlyAlwaysInlining;
> >
> >
> > ie. for all optimization levels below -O2 only the OnlyAlwaysInlining pass
> > is run. why is it so? it makes more sense to me to run NormalInlining
> > at -O1 too.
> >
> > can someone shed some light on this?
>
> Hi Roman,
>
> -O1 is intended to only do simple intraprocedural optimizations. Inlining isn't one of those. What is your use case for -O1?
freebsd bootloader. its size is smallest with -O1 + inlining with
-inline-threshold=3
I'll deal with my issue in other way, thnx!
roman
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