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Re: GCC-4.5.0 comparison with previous releases and LLVM-2.7 on SPEC2000 for x86/x86_64

From: Andrey Belevantsev <abel at ispras dot ru>
To: Xinliang David Li <davidxl at google dot com>
Cc: Vladimir Makarov <vmakarov at redhat dot com>, "gcc.gcc.gnu.org" <gcc at gcc dot gnu dot org>
Date: Mon, 15 Nov 2010 15:29:30 +0300
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>

Hello,

On 14.11.2010 0:08, Xinliang David Li wrote:

I re-measured the performance difference using trunk gcc and trunk
clang/llvm on a core-2 box.  -fno-strict-aliasing is added to gcc
because clang/llvm's type based aliasing is not incomplete and not
enabled by default. I also added -fomit-frame-pointer to clang/llvm as
this is gcc's default. The base option is -O2.

It would be very interesting to compare also peak numbers, i.e. with LTO and strict aliasing enabled, as well as -O3 and -ffast-math/-funroll-loops, similar to Vlad's or OpenSUSE's options. Can you try to measure these? Maybe you can also run SPEC2k6, if there is enough machine resources, but that's probably asking too much...

Andrey

Follow-Ups:
- Re: GCC-4.5.0 comparison with previous releases and LLVM-2.7 on SPEC2000 for x86/x86_64
  - From: Xinliang David Li

References:
- Re: GCC-4.5.0 comparison with previous releases and LLVM-2.7 on SPEC2000 for x86/x86_64
  - From: Xinliang David Li

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