https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108874
--- Comment #3 from ktkachov at gcc dot gnu.org --- (In reply to Richard Biener from comment #2) > The regression is probably rtl-optimization/target specific since we never > had this kind of pattern detected on the tree/GIMPLE level and there's no > builtin or IFN for this shuffling on u32. FWIW a colleague reported that he bisected the failure to g:98e30e515f184bd63196d4d500a682fbfeb9635e though I haven't tried it myself. We do have patterns for these in aarch64 and arm, but combine would need to match about 5 insns to get there and that's beyond its current limit of 4
