http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56950
--- Comment #8 from stevenb.gcc at gmail dot com <stevenb.gcc at gmail dot com> --- > --- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- > That still doesn't look safe -fcompare-debug wise. > I mean, if BB ends in a DEBUG_INSN (or more), it could be preceeded by note, > label, or some other insns. So shouldn't that be instead > rtx insn2 = DEBUG_INSN_P (insn) ? prev_nondebug_insn (insn2) : insn; I suppose so, yes. > (I'd hope there shouldn't be DEBUG_INSN only bb's, because then with -g0 insn > ought to be NULL and NEXT_INSN (insn) should crash), and use this in the > !NOTE_P and !LABEL_P tests? This block is a DEBUG_INSN-only block, but insn is never NULL: BB_END will be the basic block note.
