[cfe-dev] NormalInlining pass run only at > O1

[Chris Lattner]

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?

-Chris