[Bug tree-optimization/109985] [12/14 Regression] __builtin_prefetch ignored by GCC 12/13

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109985

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Sam James <sja...@gcc.gnu.org>:

https://gcc.gnu.org/g:b454ad0e4eb6bb38a6dfe15a43acb6792315640b

commit r12-10770-gb454ad0e4eb6bb38a6dfe15a43acb6792315640b
Author: Jan Hubicka <hubi...@ucw.cz>
Date:   Mon Jul 22 23:01:50 2024 +0200

    Fix handling of ICF_NOVOPS in ipa-modref

    As shown in somewhat convoluted testcase, ipa-modref is mistreating
    ECF_NOVOPS as "having no side effects".  This come from time when
    modref cared only about memory accesses and thus it was possible to
    shortcut on it.

    This patch removes (hopefully) all those bad shortcuts.
    Bootstrapped/regtested x86_64-linux, comitted.

    gcc/ChangeLog:

            PR ipa/109985

            * ipa-modref.cc (modref_summary::useful_p): Fix handling of
ECF_NOVOPS.
            (modref_access_analysis::process_fnspec): Likevise.
            (modref_access_analysis::analyze_call): Likevise.
            (propagate_unknown_call): Likevise.
            (modref_propagate_in_scc): Likevise.
            (modref_propagate_flags_in_scc): Likewise.
            (ipa_merge_modref_summary_after_inlining): Likewise.

    (cherry picked from commit efcbe7b985e24ac002a863afd609c44a67761195)