Thanks for fixing this bug! LGTM with one minor comment :)
> diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
> index 7b6111aa545..1de69019cd4 100644
> --- a/gcc/config/riscv/riscv.cc
> +++ b/gcc/config/riscv/riscv.cc
> @@ -1382,6 +1382,38 @@ riscv_v_ext_mode_p (machine_mode mode)
> || riscv_v_ext_vls_mode_p (mode);
> }
>
> +static unsigned
> +riscv_v_vls_mode_aggregate_gpr_count (unsigned vls_unit_size,
> + unsigned scalar_unit_size)
> +{
> + gcc_assert (vls_unit_size != 0 && scalar_unit_size != 0);
> +
> + if (vls_unit_size < scalar_unit_size)
> + return 1;
> +
Add gcc_assert ((vls_unit_size % scalar_unit_size) == 0); here to make
sure no accident :P
> + return vls_unit_size / scalar_unit_size;
> +}
> +
