https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72749
--- Comment #14 from Segher Boessenkool <segher at gcc dot gnu.org> --- Author: segher Date: Sun Jan 15 17:06:00 2017 New Revision: 244477 URL: https://gcc.gnu.org/viewcvs?rev=244477&root=gcc&view=rev Log: Make rtl_split_edge work for jumps that fall through (PR72749) If a jump always falls through but that cannot be optimised away, like is the case with the PowerPC bdnz insn if its jump target is the same as the fallthrough, sched gets confused if it schedules some instructions from before that jump instruction to behind it: it splits the fallthrough branch, but the jump target isn't updated, and things fall apart as in the PR. This patch fixes it. The second patch fragment makes -fsched-verbose=N work for N>=4; the currently scheduled fragment can now contain a label. Everything else seems to work fine with that. PR target/72749 * cfgrtl.c (rtl_split_edge): Also patch jump insns that jump to the fallthrough. * haifa-sched.c (dump_insn_stream): Don't crash if there is a label in the currently scheduled RTL fragment. Modified: trunk/gcc/ChangeLog trunk/gcc/cfgrtl.c trunk/gcc/haifa-sched.c
