TODO: clear statement on evaluation as to whethrer exceptions or flags raised as part of the **FP** conversion (not the int bitcopy part, the conversion part. the semantics should really be the same as frsp)
-v3.0C section 4.6.1 states:
+v3.0C section 4.6.7.1 states:
FPRF is set to the class and sign of the result, except for Invalid Operation Exceptions when VE=1.