https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96135
--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> Note on the trunk for f and g at -O3 -msse4 (and -O3 on aarch64), GCC
> produces:
> _21 = VIEW_CONVERT_EXPR<vector(8) char>(i_2(D));
> _22 = VEC_PERM_EXPR <_21, _21, { 7, 6, 5, 4, 3, 2, 1, 0 }>;
> _18 = VIEW_CONVERT_EXPR<long long int>(_22);
>
> But that VEC_PERM_EXPR is a bswap :).
>
> So to fix this at -O3 -msse4, maybe we could just do:
> (simplify
> (view_convert (vec_perm @0 @0 vector_cst_byteswap_p @1))
> (if (INTERGAL_TYPE_P (type)))
> (convert (bswap (view_convert @1))))
>
> Note I don't think we want to do the byteswap in the integer registers if we
> are going back to the floating point registers.
Or we could just support that in vect-lowering.
