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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 <jakub@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.
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