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Re: GCC-4.5.0 comparison with previous releases and LLVM-2.7 on SPEC2000 for x86/x86_64
- From: Jan Hubicka <hubicka at ucw dot cz>
- To: Xinliang David Li <davidxl at google dot com>
- Cc: Jan Hubicka <hubicka at ucw dot cz>, Vladimir Makarov <vmakarov at redhat dot com>, "gcc.gcc.gnu.org" <gcc at gcc dot gnu dot org>
- Date: Sat, 1 May 2010 11:36:38 +0200
- Subject: Re: GCC-4.5.0 comparison with previous releases and LLVM-2.7 on SPEC2000 for x86/x86_64
- References: <4BD9B2EB.9060207@redhat.com> <w2v522e93241004291117n7eb214ah55245e0209f3297e@mail.gmail.com> <4BD9D49E.1040200@redhat.com> <20100429212744.GH22195@atrey.karlin.mff.cuni.cz> <g2u522e93241004291434kbbad2896r3f01efa8befe6610@mail.gmail.com>
>
> Vortex needs -fno-strict-aliasing. It casts between two record types
> with one record being a 'prefix' of another.
So today runs are complette. Thanks to Richi who fixed ICE in symtab merging
that affected perl and GCC. With vortex problem was that in addition to
-fno-strict-aliasing it is writting to closed files that cause ICE depending on
partiuclar glibc version.
Comparing http://gcc.opensuse.org/SPEC/CINT/sb-frescobaldi.suse.de-fdo-64-FDO/recent.html
vortex is 2036 with -O2 -flto, 2438 with -O2 -flto and FDO (so about 20% improvement)
http://gcc.opensuse.org/SPEC/CINT/sb-frescobaldi.suse.de-head-64/list.html
has -O2 runs without LTO that is 1859, so 31% for LTO+FDO, 10% LTO.
Any idea if it is one of value transforms or just edge profile making the
difference? There are some cases of write only globals we can constant
propagate with -fwhole-program in SPEC, but I think it is parser.
Honza
>
> David
>
>
>
> > Honza
> >