128 lines
4.6 KiB
HTML
128 lines
4.6 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<title>Cost of High-Precision Non-built-in Floating-point</title>
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<link rel="up" href="../perf.html" title="Chapter 21. Performance">
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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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
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Floating-point</a>
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</h2></div></div></div>
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<p>
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Using user-defined floating-point like <a href="../../../../../libs/multiprecision/doc/html/index.html" target="_top">Boost.Multiprecision</a>
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has a very high run-time cost.
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</p>
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<p>
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To give some flavour of this:
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</p>
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<div class="table">
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<a name="math_toolkit.multiprecision.linpack_time"></a><p class="title"><b>Table 21.2. Linpack Benchmark</b></p>
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<div class="table-contents"><table class="table" summary="Linpack Benchmark">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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floating-point type
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</p>
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</th>
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<th>
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<p>
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speed Mflops
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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double
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</p>
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</td>
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<td>
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<p>
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2727
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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__float128
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</p>
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</td>
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<td>
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<p>
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35
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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multiprecision::float128
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</p>
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</td>
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<td>
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<p>
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35
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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multiprecision::cpp_bin_float_quad
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</p>
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</td>
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<td>
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<p>
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6
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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</div>
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<br class="table-break">
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"></td>
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<td align="right"><div class="copyright-footer">Copyright © 2006-2019 Nikhar
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Agrawal, Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos,
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Hubert Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Matthew Pulver, Johan
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Råde, Gautam Sewani, Benjamin Sobotta, Nicholas Thompson, Thijs van den Berg,
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Daryle Walker and Xiaogang Zhang<p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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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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</p>
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</div></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="tradoffs.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../perf.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="tuning.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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