fpu/softfloat: Canonicalize NaN fraction
Shift the NaN fraction to a canonical position, much like we do for the fraction of normal numbers. This will facilitate manipulation of NaNs within the shared code paths. Tested-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NAlex Bennée <alex.bennee@linaro.org> Reviewed-by: NPeter Maydell <peter.maydell@linaro.org> Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>
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