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User-space programs cannot use the 64-bit lwea/swea instructions. We can improve code generation and runtime by restricting the user-only address space to 32-bit. Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>