https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66112
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- As for ARM, please file a separate enhancement request. The generic code has the means for backends to provide better patterns, but arm doesn't use them (only i386.md uses them right now), so arm maintainers should add those if needed.
