https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112653
--- Comment #13 from GCC 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:f7884f7673444b8a2c10ea0981d480f2e82dd16a commit r14-5879-gf7884f7673444b8a2c10ea0981d480f2e82dd16a Author: Richard Biener <rguent...@suse.de> Date: Mon Nov 27 10:20:02 2023 +0100 tree-optimization/112653 - PTA and return The following separates the escape solution for return stmts not only during points-to solving but also for later querying. This requires adjusting the points-to-global tests to include escapes through returns. Technically the patch replaces the existing post-processing which computes the transitive closure of the returned value solution by a proper artificial variable with transitive closure constraints. Instead of adding the solution to escaped we track it separately. PR tree-optimization/112653 * gimple-ssa.h (gimple_df): Add escaped_return solution. * tree-ssa.cc (init_tree_ssa): Reset it. (delete_tree_ssa): Likewise. * tree-ssa-structalias.cc (escaped_return_id): New. (find_func_aliases): Handle non-IPA return stmts by adding to ESCAPED_RETURN. (set_uids_in_ptset): Adjust HEAP escaping to also cover escapes through return. (init_base_vars): Initialize ESCAPED_RETURN. (compute_points_to_sets): Replace ESCAPED post-processing with recording the ESCAPED_RETURN solution. * tree-ssa-alias.cc (ref_may_alias_global_p_1): Check the ESCAPED_RETUNR solution. (dump_alias_info): Dump it. * cfgexpand.cc (update_alias_info_with_stack_vars): Update it. * ipa-icf.cc (sem_item_optimizer::fixup_points_to_sets): Likewise. * tree-inline.cc (expand_call_inline): Reset it. * tree-parloops.cc (parallelize_loops): Likewise. * tree-sra.cc (maybe_add_sra_candidate): Check it. * gcc.dg/tree-ssa/pta-return-1.c: New testcase.
