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<title>Comparing Compilers</title>
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<link rel="up" href="../perf.html" title="Chapter 14. Performance">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="math_toolkit.comp_compilers"></a><a class="link" href="comp_compilers.html" title="Comparing Compilers">Comparing Compilers</a>
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</h2></div></div></div>
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<p>
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After a good choice of build settings the next most important thing you can
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do, is choose your compiler - and the standard C library it sits on top of
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- very carefully. GCC-3.x in particular has been found to be particularly bad
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at inlining code, and performing the kinds of high level transformations that
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good C++ performance demands (thankfully GCC-4.x is somewhat better in this
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respect).
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</p>
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<div class="table">
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<a name="math_toolkit.comp_compilers.performance_comparison_of_variou"></a><p class="title"><b>Table 14.2. Performance Comparison of Various Windows Compilers</b></p>
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<div class="table-contents"><table class="table" summary="Performance Comparison of Various Windows Compilers">
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<colgroup>
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<col>
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<col>
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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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Function
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</p>
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</th>
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<th>
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<p>
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Intel C++ 10.0
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</p>
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<p>
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( /Ox /Qipo /QxN )
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</p>
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</th>
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<th>
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<p>
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Microsoft Visual C++ 8.0
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</p>
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<p>
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( /Ox /arch:SSE2 )
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</p>
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</th>
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<th>
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<p>
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Cygwin G++ 3.4
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</p>
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<p>
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( /O3 )
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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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<a class="link" href="sf_erf/error_function.html" title="Error Functions">erf</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(4.118e-008s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(1.483e-007s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>3.24</p>
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<p> </p>
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<p>(1.336e-007s)</p>
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<p>
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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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<a class="link" href="sf_erf/error_inv.html" title="Error Function Inverses">erf_inv</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(4.439e-008s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(4.888e-007s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>7.88</p>
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<p> </p>
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<p>(3.500e-007s)</p>
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<p>
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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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<a class="link" href="sf_beta/ibeta_function.html" title="Incomplete Beta Functions">ibeta</a>
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and <a class="link" href="sf_beta/ibeta_function.html" title="Incomplete Beta Functions">ibetac</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(1.631e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>1.14</p>
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<p> </p>
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<p>(1.852e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>3.05</p>
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<p> </p>
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<p>(4.975e-006s)</p>
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<p>
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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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<a class="link" href="sf_beta/ibeta_inv_function.html" title="The Incomplete Beta Function Inverses">ibeta_inv</a>
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and <a class="link" href="sf_beta/ibeta_inv_function.html" title="The Incomplete Beta Function Inverses">ibetac_inv</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(6.133e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>1.19</p>
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<p> </p>
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<p>(7.311e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>2.60</p>
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<p> </p>
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<p>(1.597e-005s)</p>
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<p>
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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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<a class="link" href="sf_beta/ibeta_inv_function.html" title="The Incomplete Beta Function Inverses">ibeta_inva</a>,
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<a class="link" href="sf_beta/ibeta_inv_function.html" title="The Incomplete Beta Function Inverses">ibetac_inva</a>,
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<a class="link" href="sf_beta/ibeta_inv_function.html" title="The Incomplete Beta Function Inverses">ibeta_invb</a>
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and <a class="link" href="sf_beta/ibeta_inv_function.html" title="The Incomplete Beta Function Inverses">ibetac_invb</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(2.453e-005s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>1.16</p>
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<p> </p>
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<p>(2.847e-005s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>2.83</p>
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<p> </p>
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<p>(6.947e-005s)</p>
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<p>
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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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<a class="link" href="sf_gamma/igamma.html" title="Incomplete Gamma Functions">gamma_p</a> and
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<a class="link" href="sf_gamma/igamma.html" title="Incomplete Gamma Functions">gamma_q</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(6.735e-007s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>1.41</p>
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<p> </p>
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<p>(9.504e-007s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>2.78</p>
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<p> </p>
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<p>(1.872e-006s)</p>
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<p>
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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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<a class="link" href="sf_gamma/igamma_inv.html" title="Incomplete Gamma Function Inverses">gamma_p_inv</a>
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and <a class="link" href="sf_gamma/igamma_inv.html" title="Incomplete Gamma Function Inverses">gamma_q_inv</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(2.637e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>1.38</p>
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<p> </p>
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<p>(3.631e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>3.31</p>
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<p> </p>
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<p>(8.736e-006s)</p>
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<p>
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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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<a class="link" href="sf_gamma/igamma_inv.html" title="Incomplete Gamma Function Inverses">gamma_p_inva</a>
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and <a class="link" href="sf_gamma/igamma_inv.html" title="Incomplete Gamma Function Inverses">gamma_q_inva</a>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p><span class="bold"><strong>1.00</strong></span></p>
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<p> </p>
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<p>(7.716e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>1.29</p>
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<p> </p>
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<p>(9.982e-006s)</p>
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<p>
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</p>
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</td>
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<td>
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<p>
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</p>
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<p>2.56</p>
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<p> </p>
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<p>(1.974e-005s)</p>
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<p>
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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 © 2006-2010, 2012, 2013 Paul A. Bristow, Christopher Kormanyos,
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Hubert Holin, Bruno Lalande, John Maddock, Johan Råde, Gautam Sewani, Benjamin
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Sobotta, Thijs van den Berg, 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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