15 #define MAYBE_INLINE inline
16 #include "cl_DF_minusp.cc"
17 #include "cl_DF_zerop.cc"
20 const cl_DF signum (const cl_DF& x)
22 if (minusp(x)) { return cl_DF_minus1; } // x<0 -> -1.0
23 elif (zerop(x)) { return cl_DF_0; } // x=0 -> 0.0
24 else { return cl_DF_1; } // x>0 -> +1.0