Bug 111152 - ~7-9% performance regression on 510.parest_r SPEC 2017 benchmark
Summary: ~7-9% performance regression on 510.parest_r SPEC 2017 benchmark
Status: RESOLVED DUPLICATE of bug 111064
Alias: None
Product: gcc
Classification: Unclassified
Component: middle-end (show other bugs)
Version: 14.0
: P3 normal
Target Milestone: ---
Assignee: Not yet assigned to anyone
URL:
Keywords: needs-bisection
Depends on:
Blocks:
 
Reported: 2023-08-25 07:54 UTC by Filip Kastl
Modified: 2023-08-25 08:16 UTC (History)
2 users (show)

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Description Filip Kastl 2023-08-25 07:54:04 UTC 
There is a performance regression of about 7-9% on the 510.parest_r SPEC 2017 benchmark.

Between g:d073e2d75d9ed492 and g:9ade70bb86c8744f

Intel Xeon Gold 5315Y, all with -Ofast native, some with lto and/or pgo
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=801.457.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=796.457.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=792.457.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=797.457.0

With Zen3 -O2 generic lto pgo the regression is less noticeable (only 4%)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=694.457.0
Comment 1 Hongtao.liu 2023-08-25 08:08:11 UTC 
It's PR111064
Comment 2 Hongtao.liu 2023-08-25 08:09:34 UTC 
> With Zen3 -O2 generic lto pgo the regression is less noticeable (only 4%)
> https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=694.457.0

Not sure about this part
Comment 3 Filip Kastl 2023-08-25 08:15:38 UTC 
Ah, sorry. Didn't notice I'm making a duplicate.

The Zen3 regression isn't that big and could just be noise.
Comment 4 Filip Kastl 2023-08-25 08:16:27 UTC 
Marking as duplicate.

*** This bug has been marked as a duplicate of bug 111064 ***