https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116076
Bug ID: 116076 Summary: [15 Regression] slowdown of 433.milc on AMD Zen4 Product: gcc Version: 15.0 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-pc-linux-gnu Target: x86_64-pc-linux-gnu As seen here https://lnt.opensuse.org/db_default/v4/SPEC/graph?plot.0=992.70.0 there was a 4.5% exec time slowdown of the 433.milc SPEC 2006 benchmark between commits r15-2045-g61c21a719e205f r15-2061-gacd4ab8d6e8938 when run with -Ofast -march=native -flto on an AMD Zen4 machine. 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)