[Bug tree-optimization/96043] BB vectorizer costing lumps everything together

[tnfchris at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96043

--- Comment #8 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #7)
> (In reply to Tamar Christina from comment #6)
> > Hi Richi,
> > 
> > This change seems to have caused a few of our vectorization benchmarks to
> > slow down including x264 which slowed down about 7%.
> > 
> > I can see similar slowdowns on x86 
> > https://lnt.opensuse.org/db_default/v4/SPEC/12977
> > https://lnt.opensuse.org/db_default/v4/SPEC/12978
> > 
> > was this expected and we should fiddle with the cost model to recover these?
> 
> That wasn't expected - can you open a new bugreport please?  Ideally we'd
> have
> a testcase to look at of course.

Sure, will do, I'll try to isolate the function that changed to make a
testcase.