https://gcc.gnu.org/bugzilla/show_bug.cgi?id=34072

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> So we still have an issue for the C++ example with memcpy.

But the code did improve from GCC 6 to GCC 7 though.
From
        .cfi_startproc
        subl    $12, %esp
        .cfi_def_cfa_offset 16
        movzwl  16(%esp), %eax
        addl    $12, %esp
        .cfi_def_cfa_offset 4
        shrw    $8, %ax
        ret

To:
        movl    4(%esp), %eax
        movzbl  %ah, %eax

So it is definitely already much better from when this was reported.

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