Get Mantissa and Exp for X86_FP80 APFloat Constant


I have a X86_FP80 APFloat Constant. Is there any API with which I can get the value of mantissa and exponent? Or, even as a long double?
There are APIs like convertToDouble and convertToFloat for APFloat single and double precission, I am looking for something similar for extended precision(X86_FP80).