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<h1>stdlib_ilaenv2stage
<small>Function</small>
</h1>
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<h3>Contents</h3>
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<h2>public function stdlib_ilaenv2stage(ispec, name, opts, n1, n2, n3, n4)
</h2>
<p>ILAENV2STAGE is called from the LAPACK routines to choose problem-dependent
parameters for the local environment. See ISPEC for a description of
the parameters.
It sets problem and machine dependent parameters useful for *_2STAGE and
related subroutines.
ILAENV2STAGE returns an INTEGER
if ILAENV2STAGE >= 0: ILAENV2STAGE returns the value of the parameter
specified by ISPEC
if ILAENV2STAGE < 0: if ILAENV2STAGE = -k, the k-th argument had an
illegal value.
This version provides a set of parameters which should give good,
but not optimal, performance on many of the currently available
computers for the 2-stage solvers. Users are encouraged to modify this
subroutine to set the tuning parameters for their particular machine using
the option and problem size information in the arguments.
This routine will not function correctly if it is converted to all
lower case. Converting it to all upper case is allowed.</p>
<h3>Arguments</h3>
<table class="table table-striped varlist">
<thead>
<tr>
<th scope="col">Type</th>
<th scope="col">Intent</th><th scope="col">Optional</th> <th scope="col">Attributes</th>
<th scope="col"></th>
<th scope="col">Name</th>
<th scope="col"></th>
</thead>
<tbody>
<tr>
<td>
<span class="anchor" id="variable-ispec~5"></span>
integer(kind=ilp),
</td>
<td>intent(in)</td>
<td></td> <td>
</td>
<td>::</td>
<td><strong>ispec</strong></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="anchor" id="variable-name~5"></span>
character(len=*),
</td>
<td>intent(in)</td>
<td></td> <td>
</td>
<td>::</td>
<td><strong>name</strong></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="anchor" id="variable-opts~4"></span>
character(len=*),
</td>
<td>intent(in)</td>
<td></td> <td>
</td>
<td>::</td>
<td><strong>opts</strong></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="anchor" id="variable-n1~52"></span>
integer(kind=ilp),
</td>
<td>intent(in)</td>
<td></td> <td>
</td>
<td>::</td>
<td><strong>n1</strong></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="anchor" id="variable-n2~40"></span>
integer(kind=ilp),
</td>
<td>intent(in)</td>
<td></td> <td>
</td>
<td>::</td>
<td><strong>n2</strong></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="anchor" id="variable-n3~2"></span>
integer(kind=ilp),
</td>
<td>intent(in)</td>
<td></td> <td>
</td>
<td>::</td>
<td><strong>n3</strong></td>
<td>
</td>
</tr>
<tr>
<td>
<span class="anchor" id="variable-n4~2"></span>
integer(kind=ilp),
</td>
<td>intent(in)</td>
<td></td> <td>
</td>
<td>::</td>
<td><strong>n4</strong></td>
<td>
</td>
</tr>
</tbody>
</table>
<h3>Return Value
<small>
<span class="anchor" id="variable-stdlib_ilaenv2stage"></span>
integer(kind=ilp)
</small>
</h3>
<br>
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