https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116763
Bug ID: 116763
Summary: 14-19% slowdown of 436.cactusADM on aarch64
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Keywords: missed-optimization, needs-bisection
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: pheeck 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=586.100.0
(-Ofast -march=native PGO -flto)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=578.100.0
(-Ofast -march=native PGO)
there was a 14-19% exec time slowdown of the 436.cactusADM SPEC 2006 benchmark
between commits
r15-3500-g1914ca8791ce4e
r15-3520-g1a1f818c60636f
when run on an aarch64 machine (Ampere Altra - Neoverse N1).
I don't think is a regression against GCC 14. However, GCC 12 and 13 produce
faster code than the current trunk GCC. See the graphs here:
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.6=755.100.0&plot.7=868.100.0&plot.8=1032.100.0&plot.9=586.100.0
(-Ofast -march=native PGO -flto)
https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.6=761.100.0&plot.7=874.100.0&plot.8=1066.100.0&plot.9=578.100.0
(-Ofast -march=native PGO)
Btw the fact that GCC 14 is also slow is reported as pr114412.
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)
