Re: Comparison of GCC-4.9 and LLVM-3.4 performance on SPECInt2000 for x86-64 and ARM

[Ramana Radhakrishnan <ramana dot radhakrishnan at arm dot com>]

On 24/06/14 15:11, Vladimir Makarov wrote:
>    A few people asked me about new performance comparison of latest GCC
> and LLVM.  So I've finished it and put it on my site
>
> http://vmakarov.fedorapeople.org/spec/
>
>    The comparison is achievable from 2014 link and links under it in
> the left frame.
>
>    These pages are also achievable as
>
> http://vmakarov.fedorapeople.org/spec/2014/2014.html -- what I
> compare, my motivation, major results, and my conclusions.
>
> http://vmakarov.fedorapeople.org/spec/2014/llvmgcc64.html -- The
> results of comparison on x86-64 SPECInt2000
>
> http://vmakarov.fedorapeople.org/spec/2014/arm.html -- The
> results of comparison on ARM SPECInt2000

Interesting ...

On ARM, I note that by default you are generating code for fpu=vfpv3-d16 
and armv7-a. Of interest is the fact that you aren't using the Neon unit 
at all if you configure the compiler with  --with-fpu=vfpv3-d16

Did you add any other architecture specific options to your SPEC2k runs ?

regards
Ramana

>    If you need exact numbers they can be found in the tables.
>
>    If you have any comments and proposals, please feel free to write
> me.  I try to take them into account next year.