[Bug rtl-optimization/46943] Unnecessary ZERO_EXTEND

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46943

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|2012-02-02 00:00:00         |2018-4-22

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
It looks more obvious on aarch64:
        and     w1, w1, 65535
        mov     w0, 43691
        movk    w0, 0xaaaa, lsl 16
        adrp    x2, v
        and     x3, x1, 65535
        umull   x0, w1, w0
        str     x3, [x2, #:lo12:v]
        lsr     x0, x0, 33
        ret

The second and is not needed.