dlaisnan.f.html

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<pre>
      LOGICAL FUNCTION <a name="DLAISNAN.1"></a><a href="dlaisnan.f.html#DLAISNAN.1">DLAISNAN</a>(DIN1,DIN2)
<span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  -- LAPACK auxiliary routine (version 3.1) --
</span><span class="comment">*</span><span class="comment">     Univ. of Tennessee, Univ. of California Berkeley and NAG Ltd..
</span><span class="comment">*</span><span class="comment">     November 2006
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">     .. Scalar Arguments ..
</span>      DOUBLE PRECISION DIN1,DIN2
<span class="comment">*</span><span class="comment">     ..
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Purpose
</span><span class="comment">*</span><span class="comment">  =======
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  This routine is not for general use.  It exists solely to avoid
</span><span class="comment">*</span><span class="comment">  over-optimization in <a name="DISNAN.15"></a><a href="disnan.f.html#DISNAN.1">DISNAN</a>.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  <a name="DLAISNAN.17"></a><a href="dlaisnan.f.html#DLAISNAN.1">DLAISNAN</a> checks for NaNs by comparing its two arguments for
</span><span class="comment">*</span><span class="comment">  inequality.  NaN is the only floating-point value where NaN != NaN
</span><span class="comment">*</span><span class="comment">  returns .TRUE.  To check for NaNs, pass the same variable as both
</span><span class="comment">*</span><span class="comment">  arguments.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Strictly speaking, Fortran does not allow aliasing of function
</span><span class="comment">*</span><span class="comment">  arguments. So a compiler must assume that the two arguments are
</span><span class="comment">*</span><span class="comment">  not the same variable, and the test will not be optimized away.
</span><span class="comment">*</span><span class="comment">  Interprocedural or whole-program optimization may delete this
</span><span class="comment">*</span><span class="comment">  test.  The ISNAN functions will be replaced by the correct
</span><span class="comment">*</span><span class="comment">  Fortran 03 intrinsic once the intrinsic is widely available.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  Arguments
</span><span class="comment">*</span><span class="comment">  =========
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  DIN1     (input) DOUBLE PRECISION
</span><span class="comment">*</span><span class="comment">  DIN2     (input) DOUBLE PRECISION
</span><span class="comment">*</span><span class="comment">          Two numbers to compare for inequality.
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  =====================================================================
</span><span class="comment">*</span><span class="comment">
</span><span class="comment">*</span><span class="comment">  .. Executable Statements ..
</span>      <a name="DLAISNAN.39"></a><a href="dlaisnan.f.html#DLAISNAN.1">DLAISNAN</a> = (DIN1.NE.DIN2)
      RETURN
      END

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