https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67966
--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- It's again a move between a BLKmode RHS and a DImode LHS. Frankly, I don't understand why this is now allowed to reach the RTL expander, we will probably need to add conversions on quite a number of paths instead of having a single treatment in the VIEW_CONVERT_EXPR case...