https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112758
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- I must say I have no idea what WORD_REGISTER_OPERATION says about the upper bits of a paradoxical SUBREG if it is a MEM and load_extend_op (inner_mode) is ZERO_EXTEND (zeros then? Then this optimization is ok), or something else? And what it says on REGs.
