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From: "crazylht at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/98782] [11/12 Regression] Bad interaction
 between IPA frequences and IRA resulting in spills due to changes in BB
 frequencies
Date: Mon, 10 Jan 2022 01:29:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98782

--- Comment #36 from Hongtao.liu <crazylht at gmail dot com> ---
(In reply to pthaugen from comment #33)
> (In reply to rsandifo@gcc.gnu.org from comment #32)
> > Created attachment 52102 [details]
> > Alternative patch
> >=20
> > This patch is a squash of several ira tweaks that together recover the
> > pre-GCC11 exchange2 performance on aarch64.  It isn't ready for trunk
> > yet (hence lack of comments and changelog).  It would be great to hear
> > whether/how it works on other targets though.
>=20
> I tried the patch on a Power9 system. Execution time went from 371 seconds
> to 291.

The patch also recover 548.exchange2_r performance on ICX, thanks.=