dlaisnan man page on Scientific

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DLAISNAN(1)	    LAPACK auxiliary routine (version 3.2)	   DLAISNAN(1)

NAME
       DLAISNAN - routine i not for general use

SYNOPSIS
       LOGICAL FUNCTION DLAISNAN(DIN1,DIN2)

	   DOUBLE	PRECISION DIN1,DIN2

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.	InterÔÇÉ
       procedural  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.

ARGUMENTS
       DIN1	(input) DOUBLE PRECISION
		DIN2	  (input)  DOUBLE PRECISION Two numbers to compare for
		inequality.

 LAPACK auxiliary routine (versioNovember 2008			   DLAISNAN(1)
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