https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115856
Bug ID: 115856 Summary: [15 Regression] 7% slowdown of 433.milc on Zen3 Product: gcc Version: 14.0 Status: UNCONFIRMED Keywords: 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: x86_64-linux Target: x86_64-linux As seen here https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=469.70.0 there was a 7% exec time slowdown of the 433.milc SPEC 2006 benchmark between commits r15-1731-g30ad2fafa9ab24 r15-1735-ge62ea4fb8ffcab when run with -O2 -march=generic -flto on an AMD Zen3 machine. I have not seen the regression on other microarchitectures. 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)