[LLVMdev] RFC: Should we have (something like) -extra-vectorizer-passes in -O2?

[Andrew Trick]

> On Oct 14, 2014, at 10:28 AM, Hal Finkel <hfinkel at anl.gov> wrote:
> 
>>>> + instcombine
>> 
>> I'm *very* concerned about rerunning instcombine,
> 
> Why? I understand that it is not cheap (especially because it calls into ValueTracking a lot), but how expensive is it when it has nothing to do?

Ok, I’ll reserve judgement until I have that data point.

-Andy
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