tcg: Improve register allocation for matching constraints
Try harder to honor the output_pref. When we're forced to allocate a second register for the input, it does not need to use the input constraint; that will be honored by the register we allocate for the output and a move is already required. Reviewed-by: NEmilio G. Cota <cota@braap.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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