https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111294
--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:d45ddc2c04e471d0dcee016b6edacc00b8341b16 commit r14-4089-gd45ddc2c04e471d0dcee016b6edacc00b8341b16 Author: Richard Biener <rguent...@suse.de> Date: Thu Sep 14 13:06:51 2023 +0200 tree-optimization/111294 - backwards threader PHI costing This revives an earlier patch since the problematic code applying extra costs to PHIs in copied blocks we couldn't make any sense of prevents a required threading in this case. Instead of coming up with an artificial other costing the following simply removes the bits. As with all threading changes this requires a plethora of testsuite adjustments, but only the last three are unfortunate as is the libgomp team.c adjustment which is required to avoid a bogus -Werror diagnostic during bootstrap. PR tree-optimization/111294 gcc/ * tree-ssa-threadbackward.cc (back_threader_profitability::m_name): Remove (back_threader::find_paths_to_names): Adjust. (back_threader::maybe_thread_block): Likewise. (back_threader_profitability::possibly_profitable_path_p): Remove code applying extra costs to copies PHIs. libgomp/ * team.c (gomp_team_start): Assert alloca size to avoid false positive alloc-size diagnostic. gcc/testsuite/ * gcc.dg/tree-ssa/pr111294.c: New test. * gcc.dg/tree-ssa/phi_on_compare-4.c: Adjust. * gcc.dg/tree-ssa/pr59597.c: Likewise. * gcc.dg/tree-ssa/pr61839_2.c: Likewise. * gcc.dg/tree-ssa/ssa-sink-18.c: Likewise. * g++.dg/warn/Wstringop-overflow-4.C: XFAIL subtest on ilp32. * gcc.dg/uninit-pred-9_b.c: XFAIL subtest everywhere. * gcc.dg/vect/vect-117.c: Make scan for not Invalid sum conditional on lp64.
