[llvm-commits] [LLVMdev] [PATCH] BasicBlock Autovectorization Pass

[Hal Finkel]

On Thu, 2012-01-26 at 15:12 -0600, Sebastian Pop wrote:
> On Thu, Jan 26, 2012 at 2:49 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> > Thanks! Did you compile with any non-default flags other than -mllvm
> > -vectorize?
> 
> I used -O3 and -vectorize, no other non-default flags.

If I run clang -O3 -mllvm -vectorize -S -emit-llvm -o test.ll test.c
then I get no vectorization at all (the output is identical to that
without the -vectorize). What target triple is your clang targeting?

If I include -mllvm -debug-only=bb-vectorize then the relevant output
is:
BBV: fusing loop #1 for entry in main...
BBV: found 0 instructions with candidate pairs
BBV: done!
BBV: fusing loop #1 for for.body in main...
BBV: found 0 instructions with candidate pairs
BBV: done!
BBV: fusing loop #1 for for.end in main...
BBV: found 0 instructions with candidate pairs
BBV: done!
BBV: fusing loop #1 for for.cond7.preheader in main...
BBV: found 0 instructions with candidate pairs
BBV: done!
BBV: fusing loop #1 for for.body10 in main...
BBV: found 16 instructions with candidate pairs
BBV: found 62 pair connections.
BBV: selected 0 pairs.
BBV: done!
BBV: fusing loop #1 for for.inc45 in main...
BBV: found 0 instructions with candidate pairs
BBV: done!
BBV: fusing loop #1 for for.end47 in main...
BBV: found 3 instructions with candidate pairs
BBV: found 0 pair connections.
BBV: done!

 -Hal

> 
> Sebastian
> --
> Qualcomm Innovation Center, Inc is a member of Code Aurora Forum

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