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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/59739] missed optimization: attribute ((pure)) with
 aggregate returns
Date: Tue, 09 Apr 2024 07:07:58 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D59739

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---

>From PR 108635 (via PR 45115), a C++20 testcase where we should be able to
optimize into one call of `operator<=3D>`:

    #include <compare>

    struct S
    {
        std::weak_ordering operator<=3D>(const S&) const __attribute__((con=
st));
    };

    int compare3way(S& a, S& b)
    {
        return (a < b) ? -1 : (a > b) ? 1 : 0;
    }=