b62ef86e28
corrections in cpp promotion added make_safe_literal separated integers from other types dropped example91 updated CMakeLists.txt and Jamfile.v2 accordingly
65 lines
3.3 KiB
HTML
65 lines
3.3 KiB
HTML
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<td valign="top"><img href="index.html" height="164px" src="pre-boost.jpg" alt="Library Documentation Index"></td>
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<td><h2>Safe Numerics</h2></td>
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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="safe_numerics.performance_tests"></a>Performance Tests</h2></div></div></div>
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<p>Our goal is to create facilities which make it possible to write
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programs known to be correct. But we also want programmers to actually use
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the facilities we provide here. This won't happen if using these
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facilities impacts performance to a significant degree. Although we've
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taken precautions to avoid doing this, the only real way to know is to
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create and run some tests.</p>
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<p>So far we've only run one explicit performance test -
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<code class="filename"><a href="../../test/test_performance.cpp" target="_top">test_performance.cpp</a></code>.
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This runs a test from the Boost Multiprecision library to count prime
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numbers and uses on integer arithmetic. We've run the tests with
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<code class="computeroutput">unsigned</code> integers and with <code class="computeroutput">safe<unsigned></code>
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on two different compilers.. No other change was made to the program. We
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list the results without further comment.</p>
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<pre class="screen">g++ (GCC) 6.2.0
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Testing type unsigned:
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time = 17.6215
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count = 1857858
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Testing type safe<unsigned>:
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time = 22.4226
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count = 1857858
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clang-802.0.41
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Testing type unsigned:
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time = 16.9174
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count = 1857858
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Testing type safe<unsigned>:
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time = 36.5166
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count = 1857858
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</pre>
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<td align="right"><div class="copyright-footer">Copyright © 2012-2018 Robert Ramey<p><a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">Subject to Boost
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Software License</a></p>
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