softfloat: define floatx80_round()
Add a function to round a floatx80 to the defined precision (floatx80_rounding_precision) Signed-off-by: NLaurent Vivier <laurent@vivier.eu> Reviewed-by: NRichard Henderson <rth@twiddle.net> Reviewed-by: NAurelien Jarno <aurelien@aurel32.net> Message-Id: <20170628204241.32106-5-laurent@vivier.eu>
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