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<title>Cost of High-Precision Non-built-in Floating-point</title>
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<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 23.3. 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>
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Lalande, John Maddock, Evan Miller, Jeremy Murphy, Matthew Pulver, Johan Råde,
Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg, Daryle
Walker and Xiaogang Zhang<p>
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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