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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/112653] PTA should handle correctly escape
 information of values returned by a function
Date: Mon, 27 Nov 2023 14:39:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112653

--- Comment #13 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:f7884f7673444b8a2c10ea0981d480f2e82dd16a

commit r14-5879-gf7884f7673444b8a2c10ea0981d480f2e82dd16a
Author: Richard Biener <rguenther@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.=