https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109087
--- Comment #8 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Martin Liška from comment #7) > With gcc pr109087.c -w -ftrivial-auto-var-init=zero -g -O3 -march=znver3 > -fno-strict-aliasing -fno-tree-vectorize -fno-tree-slp-vectorize > it started with r13-4839-geef81eefcdc2a581. That's strange, because I > intentionally disable the vectorizer. Could be exposed by the change to ix86_expand_set_or_cpymem or ix86_reassociation_width then. Or the change to X86_TUNE_AVX256_MOVE_BY_PIECES, X86_TUNE_AVX256_STORE_BY_PIECES which adds znver3 to them ...
