https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61923
--- Comment #5 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
The difference after scheduling a block is in DFA state because of additional
advance_one_cycle call when debug_insns are present.
The situation looks like
-g
last bb insn last real bb insn
-> advance_one_cycle ->advance_one_cycle
debug_insn
->advance_one_cycle
Last advance cycle is done at the end of processing all bb insns.
I'll try to produce a patch tomorrow to fix it which is not easy as
schedule_block is now very complicated function working in many modes and
containing a lot of gotos.
