https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91635
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Other problematic splitters are zero_extendsidi2, zero_extendhi<GPR:mode>2, extend<SHORT:mode><SUPERQI:mode>2, dunno if I haven't missed something else. While they are all post-reload splitters, that doesn't mean paradoxical subregs can't appear there, just it will be less likely.
