https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119269
Bug ID: 119269
Summary: [15 Regression] 6-22% slowdown of 433.milc on Aarch64
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: missed-optimization
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: pheeck at gcc dot gnu.org
CC: wilco at gcc dot gnu.org
Blocks: 26163
Target Milestone: ---
Host: aarch64-gnu-linux
Target: aarch64-gnu-linux
As seen here
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=580.70.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=575.70.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=577.70.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=588.70.0
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=578.70.0
there were some slowdowns of the 433.milc SPEC 2006 benchmark between commits
r15-7846-gda8aaa7784810e
r15-7877-g888e70b3226225
The slowdowns range from 6% to 22%. They seem to be exclusive to Aarch64
(measured on an Ampere Altra Neoverse N1 machine).
This is a regression against GCC 14. See a comparison here:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.8=1066.70.0&plot.9=578.70.0&;
Maybe this could be caused by r15-7871-gf870302515d5fc? Cc-ing Wilco.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=26163
[Bug 26163] [meta-bug] missed optimization in SPEC (2k17, 2k and 2k6 and 95)
