https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85925
--- Comment #17 from Eric Botcazou <ebotcazou at gcc dot gnu.org> --- On further thoughts, it might be possible to rescue the mechanism because the problem here is that a ZERO_EXTRACT is happily rewritten from SI to HImode, thus breaking the WORD_REGISTER_OPERATIONS semantics. So a patch selectively disabling the mechanism for problematic operations might be better and less pessimizing.
