[Bug tree-optimization/122845] `a ^ CST ^ CST` is sometimes not folded at the gimple level (casts)

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122845

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> So maybe:
> (simplify
>  (convert (bit_op:cs @0 (bit_and @1 INTEGER_CST@2)))
>  (if (TYPE_PRECISION (type) < TYPE_PRECISION (TREE_TYPE (@0))
>       && wi::to_wide (@2) == type_mask_inprecisionoftype (type, TREE_TYPE
> (@0))))
>   (bit_op @0 (convert @1))

Or maybe that is not needed because the first pattern fixes it up before we end
up with &7.