lass="k">          call </span><span class="n">xerbla</span><span class="p">(</span><span class="s1">&#39;STPMV &#39;</span><span class="p">,</span><span class="n">info</span><span class="p">)</span><span class="w"></span>
<span class="w">          </span><span class="k">return</span>
<span class="k">      endif</span><span class="w"></span>
<span class="c">!</span>
<span class="c">!     Quick return if possible.</span>
<span class="c">!</span>
<span class="w">      </span><span class="k">if</span><span cla