softfloat: use floatx80_infinity in softfloat
Since f3218a8d ("softfloat: add floatx80 constants") floatx80_infinity is defined but never used. This patch updates floatx80 functions to use this definition. This allows to define a different default Infinity value on m68k: the m68k FPU defines infinity with all bits set to zero in the mantissa. Signed-off-by: NLaurent Vivier <laurent@vivier.eu> Reviewed-by: NRichard Henderson <richard.henderson@linaro.org> Message-Id: <20180224201802.911-4-laurent@vivier.eu>
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