https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94166
--- Comment #4 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:5ba25b2ef179aec8ba4c47612fbc5c388f41cb36 commit r10-7185-g5ba25b2ef179aec8ba4c47612fbc5c388f41cb36 Author: Jakub Jelinek <ja...@redhat.com> Date: Mon Mar 16 09:02:21 2020 +0100 tree-inline: Fix a -fcompare-debug issue in the inliner [PR94167] The following testcase fails with -fcompare-debug. The problem is that bar is marked as address_taken only with -g and not without. I've tracked it down to insert_init_stmt calling gimple_regimplify_operands even on DEBUG_STMTs. That function will just insert normal stmts before the DEBUG_STMT if the DEBUG_STMT operand isn't gimple val or invariant. While DCE will turn those statements into debug temporaries, it can cause differences in SSA_NAMEs and more importantly, the ipa references are generated from those before the DCE happens. On the testcase, the DEBUG_STMT value is (int)bar. We could generate DEBUG_STMTs with debug temporaries instead, but I fail to see the reason to do that, DEBUG_STMTs allow other expressions and all we want to ensure is that the expressions aren't too large (arbitrarily complex), but during inlining/function versioning I don't see why something would queue a DEBUG_STMT with arbitrarily complex expressions in there. 2020-03-16 Jakub Jelinek <ja...@redhat.com> PR tree-optimization/94166 * tree-ssa-reassoc.c (sort_by_mach_mode): Use SSA_NAME_VERSION as secondary comparison key. * gcc.dg/pr94166.c: New test.