projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | <html> |
| 2 | <head> | |
| 3 | <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> | |
| 4 | <title>Cost of High-Precision Non-built-in Floating-point</title> | |
| 5 | <link rel="stylesheet" href="../math.css" type="text/css"> | |
| 6 | <meta name="generator" content="DocBook XSL Stylesheets V1.77.1"> | |
| 7 | <link rel="home" href="../index.html" title="Math Toolkit 2.5.1"> | |
| 8 | <link rel="up" href="../perf.html" title="Chapter 16. Performance"> | |
| 9 | <link rel="prev" href="tradoffs.html" title="Trading Accuracy for Performance"> | |
| 10 | <link rel="next" href="tuning.html" title="Performance Tuning Macros"> | |
| 11 | </head> | |
| 12 | <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> | |
| 13 | <table cellpadding="2" width="100%"><tr> | |
| 14 | <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../boost.png"></td> | |
| 15 | <td align="center"><a href="../../../../../index.html">Home</a></td> | |
| 16 | <td align="center"><a href="../../../../../libs/libraries.htm">Libraries</a></td> | |
| 17 | <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> | |
| 18 | <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> | |
| 19 | <td align="center"><a href="../../../../../more/index.htm">More</a></td> | |
| 20 | </tr></table> | |
| 21 | <hr> | |
| 22 | <div class="spirit-nav"> | |
| 23 | <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> | |
| 24 | </div> | |
| 25 | <div class="section"> | |
| 26 | <div class="titlepage"><div><div><h2 class="title" style="clear: both"> | |
| 27 | <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 | |
| 28 | Floating-point</a> | |
| 29 | </h2></div></div></div> | |
| 30 | <p> | |
| 31 | Using user-defined floating-point like <a href="../../../../../libs/multiprecision/doc/html/index.html" target="_top">Boost.Multiprecision</a> | |
| 32 | has a very high run-time cost. | |
| 33 | </p> | |
| 34 | <p> | |
| 35 | To give some flavour of this: | |
| 36 | </p> | |
| 37 | <div class="table"> | |
| 38 | <a name="math_toolkit.multiprecision.linpack_time"></a><p class="title"><b>Table 16.2. Linpack Benchmark</b></p> | |
| 39 | <div class="table-contents"><table class="table" summary="Linpack Benchmark"> | |
| 40 | <colgroup> | |
| 41 | <col> | |
| 42 | <col> | |
| 43 | </colgroup> | |
| 44 | <thead><tr> | |
| 45 | <th> | |
| 46 | <p> | |
| 47 | floating-point type | |
| 48 | </p> | |
| 49 | </th> | |
| 50 | <th> | |
| 51 | <p> | |
| 52 | speed Mflops | |
| 53 | </p> | |
| 54 | </th> | |
| 55 | </tr></thead> | |
| 56 | <tbody> | |
| 57 | <tr> | |
| 58 | <td> | |
| 59 | <p> | |
| 60 | double | |
| 61 | </p> | |
| 62 | </td> | |
| 63 | <td> | |
| 64 | <p> | |
| 65 | 2727 | |
| 66 | </p> | |
| 67 | </td> | |
| 68 | </tr> | |
| 69 | <tr> | |
| 70 | <td> | |
| 71 | <p> | |
| 72 | __float128 | |
| 73 | </p> | |
| 74 | </td> | |
| 75 | <td> | |
| 76 | <p> | |
| 77 | 35 | |
| 78 | </p> | |
| 79 | </td> | |
| 80 | </tr> | |
| 81 | <tr> | |
| 82 | <td> | |
| 83 | <p> | |
| 84 | multiprecision::float128 | |
| 85 | </p> | |
| 86 | </td> | |
| 87 | <td> | |
| 88 | <p> | |
| 89 | 35 | |
| 90 | </p> | |
| 91 | </td> | |
| 92 | </tr> | |
| 93 | <tr> | |
| 94 | <td> | |
| 95 | <p> | |
| 96 | multiprecision::cpp_bin_float_quad | |
| 97 | </p> | |
| 98 | </td> | |
| 99 | <td> | |
| 100 | <p> | |
| 101 | 6 | |
| 102 | </p> | |
| 103 | </td> | |
| 104 | </tr> | |
| 105 | </tbody> | |
| 106 | </table></div> | |
| 107 | </div> | |
| 108 | <br class="table-break"> | |
| 109 | </div> | |
| 110 | <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> | |
| 111 | <td align="left"></td> | |
| 112 | <td align="right"><div class="copyright-footer">Copyright © 2006-2010, 2012-2014 Nikhar Agrawal, | |
| 113 | Anton Bikineev, Paul A. Bristow, Marco Guazzone, Christopher Kormanyos, Hubert | |
| 114 | Holin, Bruno Lalande, John Maddock, Jeremy Murphy, Johan Råde, Gautam Sewani, | |
| 115 | Benjamin Sobotta, Thijs van den Berg, Daryle Walker and Xiaogang Zhang<p> | |
| 116 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
| 117 | 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>) | |
| 118 | </p> | |
| 119 | </div></td> | |
| 120 | </tr></table> | |
| 121 | <hr> | |
| 122 | <div class="spirit-nav"> | |
| 123 | <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> | |
| 124 | </div> | |
| 125 | </body> | |
| 126 | </html> |