https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84710
--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> --- (In reply to Segher Boessenkool from comment #8) > Ah right, I had checking disabled. Need more coffee I guess. You don't really need to build the checking compiler for this though, it is enough to put a breakpoint on that REGNO (x) line and debug_rtx (x) first. > The insns I see are different: > > Trying 19, 20 -> 21: > 19: r106:SI#0=0 > 20: r108:SI=zero_extend(r106:SI#0) > 21: r109:SI=r108:SI 0>>0x8 > REG_DEAD r108:SI > > (see insn 20); maybe the i3 in #c1 is already modified? Likely, yes. I've just done up and debug_rtx on the 3 insns passed to try_combine. > The #c5 patch is okay for trunk, thanks! Thanks.
