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From: "hubicka at kam dot mff.cuni.cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/103223] [12 regression] Access attribute
 dropped when ipa-sra is applied
Date: Mon, 22 Nov 2021 07:53:06 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103223

--- Comment #11 from hubicka at kam dot mff.cuni.cz ---
> Xeon(R) Platinum 8358 (IceLake) (64C 128T 512G):
> BenchMarks      Copies  RunTime1        RunTime2        Rate1   Rate2   C=
ompare
> 548.exchange2_r 128     479     913     700     367     -47.57%
>=20
> Xeon(R) Gold 6252 (CascadeLake) (48C 96T 192G)
> BenchMarks      Copies  RunTime1        RunTime2        Rate1   Rate2   C=
ompare
> 548.exchange2_r 96      643     1240    391     203     -48.08%

I filled in PR103227 to track this problem.  There seems to be two
issues visible on exchange2.  First is that ipa-sra changes order of
functions which in which inliner visits them and this makes difference
in inlining decisions. Second is that ipa-sra makes some constant
propagation info to be lost.  With Martin we look into this.=