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Set the NaN propagation rule explicitly for the float_status words used in the x86 target. This is a no-behaviour-change commit, so we retain the existing behaviour of using the x87-style "prefer QNaN over SNaN, then prefer the NaN with the larger significand" for MMX and SSE. This is however not the documented hardware behaviour, so we leave a TODO note about what we should be doing instead. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-id: 20241025141254.2141506-16-peter.maydell@linaro.org