https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89954

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Target|                            |x86_64-linux-gnu
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2019-04-04
          Component|c                           |target
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Confirmed.

Though AARCH64 does the right thing though:
f:
        adrp    x0, c
        ldrb    w0, [x0, #:lo12:c]
        eor     w0, w0, 1
        ret

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