This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

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


On 06/24/2014 10:36 AM, Ramana Radhakrishnan wrote:
>
>
> 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
>
Unfortunately, that is the configuration I can use on my system because
of lack of libraries for other configurations.

I don't think Neon can improve score for SPECInt2000 significantly but
may be I am wrong.
> Did you add any other architecture specific options to your SPEC2k runs ?
>
>
No.  The only options I used are -Ofast.

Could you recommend me what best options you think I should use for this
processor.

As I wrote, I am more interesting in aarch64 which can be used in a
server (as you know RedHat works on a server market) but unfortunately I
have no such machine for SPEC benchmarking.



Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]