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<title>Cost of High-Precision Non-built-in Floating-point</title>
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<a name="math_toolkit.multiprecision"></a><a class="link" href="multiprecision.html" title="Cost of High-Precision Non-built-in Floating-point">Cost of High-Precision Non-built-in
    Floating-point</a>
</h2></div></div></div>
<p>
      Using user-defined floating-point like <a href="../../../../../libs/multiprecision/doc/html/index.html" target="_top">Boost.Multiprecision</a>
      has a very high run-time cost.
    </p>
<p>
      To give some flavour of this:
    </p>
<div class="table">
<a name="math_toolkit.multiprecision.linpack_time"></a><p class="title"><b>Table&#160;21.2.&#160;Linpack Benchmark</b></p>
<div class="table-contents"><table class="table" summary="Linpack Benchmark">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
              <p>
                floating-point type
              </p>
            </th>
<th>
              <p>
                speed Mflops
              </p>
            </th>
</tr></thead>
<tbody>
<tr>
<td>
              <p>
                double
              </p>
            </td>
<td>
              <p>
                2727
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                __float128
              </p>
            </td>
<td>
              <p>
                35
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                multiprecision::float128
              </p>
            </td>
<td>
              <p>
                35
              </p>
            </td>
</tr>
<tr>
<td>
              <p>
                multiprecision::cpp_bin_float_quad
              </p>
            </td>
<td>
              <p>
                6
              </p>
            </td>
</tr>
</tbody>
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