[Bug c++/67302] [C++14] copy elision in return (expression)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67302

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppa...@gcc.gnu.org>:

https://gcc.gnu.org/g:21761d2b2b01f6cef4287c646845f6b3006546aa

commit r12-1698-g21761d2b2b01f6cef4287c646845f6b3006546aa
Author: Patrick Palka <ppa...@redhat.com>
Date:   Mon Jun 21 07:54:29 2021 -0400

    c++: REF_PARENTHESIZED_P wrapper inhibiting NRVO [PR67302]

    Here, in C++14 or later, we remember the parentheses around 'a' in the
    return statement by using a REF_PARENTHESIZED_P wrapper, which ends up
    inhibiting NRVO because we don't look through this wrapper before
    checking the conditions for NRVO.  This patch fixes this by calling
    maybe_undo_parenthesized_ref sooner in check_return_expr.

            PR c++/67302

    gcc/cp/ChangeLog:

            * typeck.c (check_return_expr): Call maybe_undo_parenthesized_ref
            sooner, before the NRVO handling.

    gcc/testsuite/ChangeLog:

            * g++.dg/opt/nrv21.C: New test.