https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87720
--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> --- Author: segher Date: Wed Oct 24 22:34:40 2018 New Revision: 265474 URL: https://gcc.gnu.org/viewcvs?rev=265474&root=gcc&view=rev Log: combine: Don't do make_more_copies for dest PC (PR87720) Jumps are written in RTL as moves to PC. But the latter has no mode, so we shouldn't try to use it. Since the optimization this routine does does not really help for jumps at all, let's just skip it. PR rtl-optimization/87720 * combine.c (make_more_copies): Skip if the dest is pc_rtx. Modified: trunk/gcc/ChangeLog trunk/gcc/combine.c