NAME

       laisnan - laisnan: test for NaN, unoptimized

SYNOPSIS

   Functions
       logical function dlaisnan (din1, din2)
           DLAISNAN tests input for NaN by comparing two arguments for inequality.
       logical function slaisnan (sin1, sin2)
           SLAISNAN tests input for NaN by comparing two arguments for inequality.

Detailed Description

Function Documentation

   logical function dlaisnan (double precision, intent(in) din1, double precision, intent(in)
       din2)
       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.

   logical function slaisnan (real, intent(in) sin1, real, intent(in) sin2)
       SLAISNAN 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 SISNAN.

            SLAISNAN 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
           SIN1

                     SIN1 is REAL

           SIN2

                     SIN2 is REAL
                     Two numbers to compare for inequality.

       Author
           Univ. of Tennessee

           Univ. of California Berkeley

           Univ. of Colorado Denver

           NAG Ltd.

Author

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