Message The _FASTMATH version of this function has been specified, but _FASTMATH routines do not support the IEEE behaviors requested and will simply trap and terminate when given arguments or computing values outside the normal range. Description The compiler has recognized a math intrinsic function that has a _FASTMATH version and the compilation has defined the macro _FASTMATH, but command line options have also specified IEEE trapping behaviors other than the default of flushing underflow to zero and aborting on all others. User Action If the body of your code relies on IEEE denormals, infinities, or nans, but is careful to condition the arguments to math library functions to avoid passing or computing these values, you may ignore or suppress this warning. Otherwise, you should either remove the options specifying non-default IEEE behavior or else undefine the _FASTMATH macro.