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From: "rvmallad at amazon dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107409] Perf loss ~5% on 519.lbm_r SPEC
 cpu2017 benchmark with r10-5090-ga9a4edf0e71bba
Date: Mon, 20 Feb 2023 03:57:15 +0000
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X-Bugzilla-Component: tree-optimization
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107409

--- Comment #20 from Rama Malladi <rvmallad at amazon dot com> ---
@Martin J and @Sebastian P, Let me walk you through the perf data and my
triage.

First, my triage has been on Graviton 3 (neoverse-v1) processor based
instances. Next, I was looking for perf delta going from gcc-7 to gcc-10. I
found 2 issues: One was reported in 107413
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107413) and fixed (the perf=
 delta
between gcc-7 and gcc-8 -- 215s vs. 266s); Another one is the issue reporte=
d in
here.

I did another triage and landed at the same commit that I reported earlier.

# first bad commit: [a9a4edf0e71bbac9f1b5dcecdcf9250111d16889] Update
max_bb_count in execute_fixup_cfg

Please let me know any further info/ studies you would like to see on this
report.

Thank you.=