https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89324
ktkachov at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |matmal01 at gcc dot gnu.org --- Comment #2 from ktkachov at gcc dot gnu.org --- The sub<mode>3_compare1_imm pattern was introduced for GCC 9. It's probably something going wrong with the constraints. Matthew, could you take a look please?