Hi all, GCC has a number of floating-point-related type-generic built-ins, which are great and which we largely rely on in the gfortran runtime library (rather than depending on the possibly poor-quality target math library).
However, I have not been able to find a way to test for a signaling NaN using the existing built-ins? __builtin_fpclassify() and __builtin_isnan() both return the same thing for quite and signaling NaNs. We have a __builtin_nans() function to generate a signaling NaN, but nothing to find one. Am I missing something? Would it be hard to implement such a built-in? Thanks, FX
