* libm/mathfp/sf_isinf.c (isinff): Change to use _DEFUN macro. [_DOUBLE_IS_32BITS](isinf): New function that calls isinff. * libm/mathfp/sf_isnan.c (isnanf): Change to use _DEFUN macro. [_DOUBLE_IS_32BITS](isnan): New function that calls isnanf.