https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107153
--- Comment #3 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:89228e3985c5cdf6be58a3b5b1afcad91e9e3422 commit r13-3161-g89228e3985c5cdf6be58a3b5b1afcad91e9e3422 Author: Richard Biener <rguent...@suse.de> Date: Fri Oct 7 10:28:56 2022 +0200 tree-optimization/107153 - autopar SSA update issue autopar performs insertion of stores, eventually requiring a virtual loop PHI and assorted LC PHI adjustments which we intend to do once after the pass finishes. But we also perform intermediate update_ssa after loop duplication which can lose this fact. The following forces renaming of the virtual operand before the final SSA update to fix that. It also removes the explicit update_ssa call from the gimple_duplicate_sese_tail utility as has been done for all other such utilities and instead performs the SSA update from autopar. PR tree-optimization/107153 * tree-cfg.cc (gimple_duplicate_sese_tail): Do not update SSA form here. * tree-parloops.cc (gen_parallel_loop): Update SSA form after to-exit-first transform, no PHI insertion is necessary. (pass_parallelize_loops::execute): Force re-write of the virtual operand SSA web. * gcc.dg/autopar/pr107153.c: New testcase.
