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[Bug libfortran/78379] Processor-specific versions for matmul
- From: "jvdelisle at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 17 Nov 2016 22:56:57 +0000
- Subject: [Bug libfortran/78379] Processor-specific versions for matmul
- Auto-submitted: auto-generated
- References: <bug-78379-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78379
--- Comment #5 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
(In reply to Uroš Bizjak from comment #4)
> (In reply to Jerry DeLisle from comment #3)
> > I did apply your second patch:
> >
> > I do not get any improvement and results are diminished from current trunk,
> > so I am missing something. This is same machine I used showing results in
> > 51119. It does have avx.
>
> You have AMD processor, can you try with -mprefer-avx128 option?
You may notice I was invoking the wrong executable in what I posted in comment
#3. I did rerun the correct one several times and tried it with -mavx
-mprefer-avx128. I get the same poor results regardless.