dlaisnan.f(3)

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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