mips, ppc and sparc64 are in theory fine on llvm already, in practice there are issues but nothing that can't be worked through, especially given past work Open

mips, ppc and sparc64 are in theory fine on llvm already, in practice there are issues but nothing that can't be worked through, especially given past work OpenBSD has shown on gcc. All 3 are commercially viable for at least a decade. m88k and sh4 are the odd ducks, and if there were a backend wow that would be painful to build llvm on natively :)