https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95080
--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:18edc195442291525e04f0fa4d5ef972155117da commit r11-351-g18edc195442291525e04f0fa4d5ef972155117da Author: Jakub Jelinek <ja...@redhat.com> Date: Wed May 13 11:22:37 2020 +0200 Fix -fcompare-debug issue in purge_dead_edges [PR95080] The following testcase fails with -fcompare-debug, the bug used to be latent since introduction of -fcompare-debug. The loop at the start of purge_dead_edges behaves differently between -g0 and -g - if the last insn is a DEBUG_INSN, then it skips not just DEBUG_INSNs but also NOTEs until it finds some other real insn (or bb head), while with -g0 it will not skip any NOTEs, so if we have real_insn note debug_insn // not present with -g0 then with -g it might remove useless REG_EH_REGION from real_insn, while with -g0 it will not. Yet another option would be not skipping NOTE_P in the loop; I couldn't find in history rationale for why it is done. 2020-05-13 Jakub Jelinek <ja...@redhat.com> PR debug/95080 * cfgrtl.c (purge_dead_edges): Skip over debug and note insns even if the last insn is a note. * g++.dg/opt/pr95080.C: New test.
