NAME

       dlaisnan.f -

SYNOPSIS

   Functions/Subroutines
       logical function dlaisnan (DIN1, DIN2)
           DLAISNAN tests input for NaN by comparing two arguments for inequality.

Function/Subroutine Documentation

   logical function dlaisnan (double precisionDIN1, double precisionDIN2)
       DLAISNAN tests input for NaN by comparing two arguments for inequality.

       Purpose:

            This routine is not for general use.  It exists solely to avoid
            over-optimization in DISNAN.

            DLAISNAN checks for NaNs by comparing its two arguments for
            inequality.  NaN is the only floating-point value where NaN != NaN
            returns .TRUE.  To check for NaNs, pass the same variable as both
            arguments.

            A compiler must assume that the two arguments are
            not the same variable, and the test will not be optimized away.
            Interprocedural or whole-program optimization may delete this
            test.  The ISNAN functions will be replaced by the correct
            Fortran 03 intrinsic once the intrinsic is widely available.

       Parameters:
           DIN1

                     DIN1 is DOUBLE PRECISION

           DIN2

                     DIN2 is DOUBLE PRECISION
                     Two numbers to compare for inequality.

       Author:
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

       Date:
           September 2012

       Definition at line 75 of file dlaisnan.f.

Author

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