[LLVMdev] Turning on/off instruction extensions

[Hal Finkel]

On Tue, 2011-12-13 at 10:22 -0600, Hal Finkel wrote:
> On Tue, 2011-12-13 at 13:00 +0100, Pablo Barrio wrote:
> > On 12/12/11 17:07, Hal Finkel wrote:
> > > On Mon, 2011-12-12 at 12:59 +0100, Pablo Barrio wrote:
> > >>
> > >> I'm still getting the following error:
> > >>
> > >> ---
> > >> 1 out of 3 hunks FAILED -- saving rejects to file
> > >> lib/Transforms/IPO/PassManagerBuilder.cpp.rej
> > >> ---
> > >>
> > >> I'm using LLVM rev. 146369 (current trunk). Is it the same as you? If
> > >> not, tell me your revision and I'll try again.
> > > LLVM develops quickly ;) -- The patch you have is again out of sync.
> > > I'll send an updated patch to the list soon.
> > 
> > Great! I'll wait for the new patch. Thanks for the help!

Try the patch attached to:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20111212/133389.html

 -Hal

> > 
> > One more question: I'm currently using dragonegg for autovectorization, 
> > but I cannot get any vector longer than 4 elements for floats and 2 for 
> > doubles. I suspect this is because my processor doesn't support bigger 
> > vectors. However, I would like to generate bigger vectors into the LLVM 
> > IR, and then decide what to do with them in the backend. Can your 
> > vectorizer do something like that?
> 
> Yes, just pass the flag: -bb-vectorize-vector-bits=256 (or whatever). It
> will then try to generate vectors *up to* that size (could be smaller,
> but not larger).
> 
>  -Hal
> 
> > 
> > Thanks,
> > Pablo
> > 
> > >> Suggestion: would it be possible to have a patch for the stable version
> > >> (LLVM 3.0)?
> > > I'll add that to my TODO list, but I probably won't get to it until
> > > after the current patch finishes code review. I'll worry about
> > > backporting after that.
> > >
> > >   -Hal
> > >
> > >> Thanks ahead,
> > >> Pablo
> > 
> > 
> 

-- 
Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory