https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104263
--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> --- OK, so with the abnormal edges the issue is that DCE1 removes the recursive call to foo () (because the function is "wrongly" pure) which causes us to clear cfun->calls_setjmp but then any further gimple_purge_dead_abnormal_call_edges will simply do nothing (as premature optimization one could guess). So the bug would be that we fail to wipe all abnormal edges when a function no longer calls setjmp or has a nonlocal label. The easiest fix is to remove the premature optimization in gimple_purge_dead_abnormal_call_edges. That leaves the abnormal edges from bar() even after DCE removes the recursive call to foo() (still a missed optimization) but it at least will not leave us with stray abnormal edges from non-call / non-computed goto stmts in the IL. It also resolves the compare-debug failure for this testcase (but maybe there's a latent issue in store-merging still).
