Re: [PATCH v1] RISC-V: Bugfix for vls integer mode calling convention

[Kito Cheng <kito.cheng@gmail.com>]

> @@ -4868,6 +4968,63 @@ riscv_pass_fpr_pair (machine_mode mode, unsigned regno1,
>                                    GEN_INT (offset2))));
>  }
>
> +static rtx
> +riscv_pass_vls_aggregate_in_gpr_or_fpr (struct riscv_arg_info *info,
> +                                       machine_mode mode, unsigned gpr_base,
> +                                       unsigned fpr_base)

Tried a few more clang and GCC code gen and I found VLS vector is
always passed in
GPR, and never passed in FPR, so I think I should update psABI rather than fix
that on GCC side.

> @@ -4997,9 +5170,7 @@ riscv_get_arg_info (struct riscv_arg_info *info, const CUMULATIVE_ARGS *cum,
>    info->gpr_offset = cum->num_gprs;
>    info->fpr_offset = cum->num_fprs;
>
> -  /* When disable vector_abi or scalable vector argument is anonymous, this
> -     argument is passed by reference.  */
> -  if (riscv_v_ext_mode_p (mode) && (!riscv_vector_abi || !named))
> +  if (riscv_mode_pass_by_reference_p (mode, named))

Keep as it is fine since riscv_vector_abi is gone.

>      return NULL_RTX;
>
>    if (named)