[LLVMdev] pb05 results for current llvm/dragonegg

[Jack Howarth]

On Tue, Apr 03, 2012 at 10:13:39AM +0200, Duncan Sands wrote:
> Hi Anton,
> 
> >>                dragonegg degg+vectorize degg+optnz  gfortran
> >> ac               12.45       12.45         8.85       8.80
> >> gas_dyn          11.72       11.80         4.47       4.26
> >> induct           24.02       24.91        12.08      13.65
> >> rnflow           32.25       32.35        26.47      24.06
> > Any idea what might cause such differences here?
> 
> I haven't analysed these, but as a general remark: if "degg+optnz" does much
> better than "dragonegg" then that indicates a weakness in LLVM's IR level
> optimizers, while if "gfortran" does much better than "degg+optnz" then that
> indicates a weakness in LLVM's codegen.  Applying this to the above suggests
> that most of the differences are coming from LLVM's IR level optimizers not
> doing a good job somewhere.

Duncan,
   I can add a table column benchmarking...

de-gfortran46 -msse3 -ffast-math -funroll-loops -O3 -fno-tree-vectorize -fplugin-arg-dragonegg-enable-gcc-optzns %n.f90 -o %n

which would separate out the vectorization component. This might be more
informative in identifying weak points in the LLVM's IR level.
            Jack

> 
> Ciao, Duncan.
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