Re: [PATCH v3 11/11] riscv: thead: Add support for the XTheadFMemIdx ISA extension

[Kito Cheng via Gcc-patches]

> > +(define_memory_constraint "Qmx"
> > +  "@internal
> > +   An address valid for GPR."
> > +  (and (match_code "mem")
> > +       (match_test "!riscv_legitimize_address_index_p (
> > +                   XEXP (op, 0), GET_MODE (op), false)")))
>
> Check TARGET_XTHEADFMEMIDX, and I don't quite understand why it

I changed my mind, don't check TARGET_XTHEADFMEMIDX here,
check ext in the pattern instead.