[Bug rtl-optimization/87238] Redundant Restore of $x0 when memcpy always returns the first argument.

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87238

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Target|                            |aarch64-*-*
            Version|unknown                     |7.3.0

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>$ g++ -O3 -arch arm64 test.cpp -S -o -

That command line is seems wrong.
So does the output of the assembly code too.

Anyways confirmed.

        mov     x1, x2
        mov     x2, 256
        add     x29, sp, 0
        .cfi_def_cfa_register 29
        add     x0, x29, 16
        bl      memcpy
        add     x0, x29, 16
        bl      _Z13structByValue9BigStruct
        ldp     x29, x30, [sp], 272