https://bugs.kde.org/show_bug.cgi?id=432552

--- Comment #1 from Julian Seward <jsew...@acm.org> ---
I suspect this can be fixed by finding the following at or near
line 4967 of guest_arm64_toIR.c

         Bool earlyWBack
           = wBack && simm9 < 0 && (szB == 8 || szB == 4)
             && how == BITS2(1,1) && nn == 31 && !isLoad;

and changing it to also accept szB == 2 and szB == 1.  Given the
existing logic, it's not surprising that you observe ..

  This error is emitted for byte and half-word stores.
  The error does not happen for word and double-word stores.

I haven't tested this proposed fix yet though.

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