https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111152
Bug ID: 111152
Summary: ~7-9% performance regression on 510.parest_r SPEC 2017
benchmark
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: needs-bisection
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: fkastl at suse dot cz
CC: mjambor at suse dot cz
Target Milestone: ---
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
