[Bug tree-optimization/101909] 73% regression on tfft benchmark for -O2 -ftree-loop-vectorize compared to -O2 on zen hardware

2021-08-16 Thread crazylht at gmail dot com via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101909

--- Comment #5 from Hongtao.liu  ---
Just note there is no regression for tfft benchmark comparing -O2
-ftree-loop-vectorize to -O2 on CLX.

[Bug tree-optimization/101909] 73% regression on tfft benchmark for -O2 -ftree-loop-vectorize compared to -O2 on zen hardware

2021-08-16 Thread rguenther at suse dot de via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101909

--- Comment #4 from rguenther at suse dot de  ---
On Mon, 16 Aug 2021, marxin at gcc dot gnu.org wrote:

> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101909
> 
> Martin Liška  changed:
> 
>What|Removed |Added
> 
>  CC||marxin at gcc dot gnu.org
> 
> --- Comment #3 from Martin Liška  ---
> (In reply to Jan Hubicka from comment #2)
> > > So that's znver1 (split AVX IIRC) compared to znver2?
> > Martin will know how to decode machine names.  I am never sure.
> > It is with generic, so split AVX does not make difference.
> > 
> > Honza
> 
> zenith:
> https://lnt.opensuse.org/db_default/v4/SPEC/machine/376
> 
> benzen:
> https://lnt.opensuse.org/db_default/v4/SPEC/machine/393

So indeed zenith is znver1 and benzen znver2.  But yeah, with
generic -O2 we don't use AVX.

[Bug tree-optimization/101909] 73% regression on tfft benchmark for -O2 -ftree-loop-vectorize compared to -O2 on zen hardware

2021-08-16 Thread marxin at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101909

Martin Liška  changed:

   What|Removed |Added

 CC||marxin at gcc dot gnu.org

--- Comment #3 from Martin Liška  ---
(In reply to Jan Hubicka from comment #2)
> > So that's znver1 (split AVX IIRC) compared to znver2?
> Martin will know how to decode machine names.  I am never sure.
> It is with generic, so split AVX does not make difference.
> 
> Honza

zenith:
https://lnt.opensuse.org/db_default/v4/SPEC/machine/376

benzen:
https://lnt.opensuse.org/db_default/v4/SPEC/machine/393

[Bug tree-optimization/101909] 73% regression on tfft benchmark for -O2 -ftree-loop-vectorize compared to -O2 on zen hardware

2021-08-16 Thread hubicka at ucw dot cz via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101909

--- Comment #2 from Jan Hubicka  ---
> So that's znver1 (split AVX IIRC) compared to znver2?
Martin will know how to decode machine names.  I am never sure.
It is with generic, so split AVX does not make difference.

Honza

[Bug tree-optimization/101909] 73% regression on tfft benchmark for -O2 -ftree-loop-vectorize compared to -O2 on zen hardware

2021-08-16 Thread rguenth at gcc dot gnu.org via Gcc-bugs 
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101909

Richard Biener  changed:

   What|Removed |Added

  Component|middle-end  |tree-optimization
   Keywords||missed-optimization
 Blocks||53947
 Target||x86_64-*-*
 CC||rguenth at gcc dot gnu.org

--- Comment #1 from Richard Biener  ---
So that's znver1 (split AVX IIRC) compared to znver2?


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations