89 lines
2.4 KiB
Fortran
89 lines
2.4 KiB
Fortran
*> \brief \b SLAISNAN tests input for NaN by comparing two arguments for inequality.
|
|
*
|
|
* =========== DOCUMENTATION ===========
|
|
*
|
|
* Online html documentation available at
|
|
* http://www.netlib.org/lapack/explore-html/
|
|
*
|
|
*> \htmlonly
|
|
*> Download SLAISNAN + dependencies
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/slaisnan.f">
|
|
*> [TGZ]</a>
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/slaisnan.f">
|
|
*> [ZIP]</a>
|
|
*> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/slaisnan.f">
|
|
*> [TXT]</a>
|
|
*> \endhtmlonly
|
|
*
|
|
* Definition:
|
|
* ===========
|
|
*
|
|
* LOGICAL FUNCTION SLAISNAN( SIN1, SIN2 )
|
|
*
|
|
* .. Scalar Arguments ..
|
|
* REAL, INTENT(IN) :: SIN1, SIN2
|
|
* ..
|
|
*
|
|
*
|
|
*> \par Purpose:
|
|
* =============
|
|
*>
|
|
*> \verbatim
|
|
*>
|
|
*> 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.
|
|
*> \endverbatim
|
|
*
|
|
* Arguments:
|
|
* ==========
|
|
*
|
|
*> \param[in] SIN1
|
|
*> \verbatim
|
|
*> SIN1 is REAL
|
|
*> \endverbatim
|
|
*>
|
|
*> \param[in] SIN2
|
|
*> \verbatim
|
|
*> SIN2 is REAL
|
|
*> Two numbers to compare for inequality.
|
|
*> \endverbatim
|
|
*
|
|
* Authors:
|
|
* ========
|
|
*
|
|
*> \author Univ. of Tennessee
|
|
*> \author Univ. of California Berkeley
|
|
*> \author Univ. of Colorado Denver
|
|
*> \author NAG Ltd.
|
|
*
|
|
*> \ingroup OTHERauxiliary
|
|
*
|
|
* =====================================================================
|
|
LOGICAL FUNCTION SLAISNAN( SIN1, SIN2 )
|
|
*
|
|
* -- LAPACK auxiliary routine --
|
|
* -- LAPACK is a software package provided by Univ. of Tennessee, --
|
|
* -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
|
|
*
|
|
* .. Scalar Arguments ..
|
|
REAL, INTENT(IN) :: SIN1, SIN2
|
|
* ..
|
|
*
|
|
* =====================================================================
|
|
*
|
|
* .. Executable Statements ..
|
|
SLAISNAN = (SIN1.NE.SIN2)
|
|
RETURN
|
|
END
|