[PATCH] Enable SLP-vectorization of intrinsics.

[Arnold Schwaighofer]

On Jan 17, 2014, at 1:18 PM, Raul Silvera <rsilvera at google.com> wrote:

> That's what I'm seeing. I can get this code to be exercised if I manually change the calls to intrinsics, and that's how I've been testing it.
> 
> My plan is to have two more phases for this work:
> 1. Mimic the code in the Loop vectorizer so that we vectorize a small set of math function calls into vector intrinsics.
> 
> 2. Develop a configurable mechanism to allow vectorization of arbitrary functions, integrated into TargetLibraryInfo. This would be configurable so that vectorization would be sensitive to different vector libraries available in each platform.

Have you seen the "RFC: enable vectorization of call instructions in the loop vectorizer" thread?
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20140113/201603.html

James Molloy is implementing a TargetLibraryInfo interface for this use case - vectorized versions of functions - and teaching the loop vectorizer to use it.


Thanks,
Arnold

> 
> 
> 
> 
> On Fri, Jan 17, 2014 at 12:41 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> ----- Original Message -----
> > From: "Nadav Rotem" <nrotem at apple.com>
> > To: "Hal Finkel" <hfinkel at anl.gov>
> > Cc: reviews+D2535+public+071e8fd9238b048b at llvm-reviews.chandlerc.com, chandlerc at gmail.com, llvm-commits at cs.uiuc.edu,
> > rsilvera at google.com
> > Sent: Friday, January 17, 2014 2:18:53 PM
> > Subject: Re: [PATCH] Enable SLP-vectorization of intrinsics.
> >
> > I think that we are converting some functions to llvm intrinsics.
> > Right?
> 
> Clang produces intrinsics for sqrt (only in fast-math mode), pow and fma. I think that's it, and until you get to CodeGen, I don't think we normally convert anything else at the LLVM level.
> 
>  -Hal
> 
> >
> > On Jan 17, 2014, at 12:11 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> >
> > > ----- Original Message -----
> > >> From: "Nadav Rotem" <nrotem at apple.com>
> > >> To: nrotem at apple.com, rsilvera at google.com
> > >> Cc: chandlerc at gmail.com, llvm-commits at cs.uiuc.edu
> > >> Sent: Friday, January 17, 2014 2:06:55 PM
> > >> Subject: Re: [PATCH] Enable SLP-vectorization of intrinsics.
> > >>
> > >>
> > >>  The code looks great.  I was wondering if you had a chance to run
> > >>  some performance tests on it.  Does it catch anything in the LLVM
> > >>  test suite?
> > >
> > > Why do you expect it to catch anything in the test-suite until we
> > > get the function calls too (just as we do in the loop vectorizer)?
> > >
> > > -Hal
> > >
> > >>
> > >> http://llvm-reviews.chandlerc.com/D2535
> > >> _______________________________________________
> > >> llvm-commits mailing list
> > >> llvm-commits at cs.uiuc.edu
> > >> http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
> > >>
> > >
> > > --
> > > Hal Finkel
> > > Assistant Computational Scientist
> > > Leadership Computing Facility
> > > Argonne National Laboratory
> >
> >
> 
> --
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
> 
> 
> 
> -- 
>  Raúl E. Silvera 
> 
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