[Bug tree-optimization/115693] 8 std::byte std::array comparison potential missed optimization

[xry111 at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115693

Xi Ruoyao <xry111 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Version|unknown                     |14.1.0
                 CC|                            |xry111 at gcc dot gnu.org
          Component|libstdc++                   |tree-optimization

--- Comment #1 from Xi Ruoyao <xry111 at gcc dot gnu.org> ---
I'm transferring it to tree-optimization as the following cases are compiled to
stupid code:

char a[8], b[8];

int test()
{
        for (int i = 0; i < 8; i++)
                if (a[i] != b[i])
                        return 0;

        return 1;
}

int test1()
{
        int ret = 0;
        for (int i = 0; i < 8; i++)
                ret = ret || a[i] != b[i];

        return ret;
}

So it makes more sense to fix this in the optimization passes, instead of
ad-hoc hack in libstdc++.

But I'm not sure if there already exists a dup.