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From: "chenglulu at loongson dot cn" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/112919] LoongArch: Alignments in tune parameters are not
 precise and they regress performance
Date: Wed, 06 Mar 2024 08:33:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112919

--- Comment #13 from chenglulu <chenglulu at loongson dot cn> ---
(In reply to Xi Ruoyao from comment #9)
> (In reply to chenglulu from comment #8)
> > (In reply to Xi Ruoyao from comment #7)
> > > Any update? :)
> >=20
> > Well, I haven't run it yet. Since this does not have a big impact on the
> > spec score, I am currently testing it on a single-channel machine, so t=
he
> > test time will be longer.
> > I will reply here as soon as the results are available.
>=20
> Can we determine on LA664 if the current default alignment is better than
> not aligning at all?  Coremarks results suggest the current default is ev=
en
> worse than not aligning, but arguably Coremarks is far different from real
> workloads. However if the current default is not better than not aligning
> (or the difference is only marginal and is likely covered up by some rand=
om
> fluctuation) we can disable the aligning for LA664.
>=20
> (Maybe we and the HW engineers have done some repetitive work or even some
> work cancelling each other out :(. )

The results of spec2006 on 3A6000 were obtained, I removed the more volatile
test items, '-falign-loops=3D8 -falign-functions=3D8 -falign-jumps=3D32
-falign-lables=3D4' this set of parameters got the highest score. This is t=
he
same combination of parameters as the coremark tested by Xu Chenghua.=