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This will eventually simplify front-end usage, and will allow backends to unset TCG_TARGET_HAS_MEMORY_BSWAP without loss of optimization. The argument is added during expansion, not currently exposed to the front end translators. The backends currently only support a flags value of either TCG_BSWAP_IZ, or (TCG_BSWAP_IZ | TCG_BSWAP_OZ), since they all require zero top bytes and leave them that way. At the existing call sites we pass in (TCG_BSWAP_IZ | TCG_BSWAP_OZ), except for the flags-ignored cases of a 32-bit swap of a 32-bit value and or a 64-bit swap of a 64-bit value, where we pass 0. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>