https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65028
--- Comment #14 from Jan Hubicka <hubicka at ucw dot cz> --- Thanks for looking into that! > > Why do we think rPrimary is 16-byte aligned when it is only 8-byte aligned? ipa-cp newly does alignment propagation. You may try to just disable it by short cirucuiting ipcp_store_alignment_results (also you ought to be able to find the wrong alignment upgrade in the ipa-cp dumps) Honza