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Re: GCC-4.5.0 comparison with previous releases and LLVM-2.7 on SPEC2000 for x86/x86_64
- From: Xinliang David Li <davidxl at google dot com>
- To: Paolo Bonzini <bonzini at gnu dot org>
- Cc: Vladimir Makarov <vmakarov at redhat dot com>, "gcc.gcc.gnu.org" <gcc at gcc dot gnu dot org>
- Date: Sat, 13 Nov 2010 14:41:31 -0800
- 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> <AANLkTin61nGPbc2uZbgak1JbvCQK-cnNLvhjosRXxw0F@mail.gmail.com> <4CDF1388.6070404@gnu.org>
On Sat, Nov 13, 2010 at 2:39 PM, Paolo Bonzini <bonzini@gnu.org> wrote:
> On 11/13/2010 10:08 PM, Xinliang David Li wrote:
>>
>> Though gcc leads LLVM in performance overrall, there are a couple of
>> benchmarks gcc is worse: vpr and crafty (64bit and 32bit), parser and
>> twolf (32bit), vortex (64bit). ?This needs to be triaged. ? gcc
>> miscompiles gcc and eon in 32bit -- is there a bug tracking the
>> problem?
>
> Have you tried -ffast-math or -mfpmath=sse for eon?
>
-ffast-math is used on eon.
David
> Paolo
>