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<article>
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<main class="v-doc">
<h1 class="main">Performance tuning</h1>
<p>When compiled with <code>-prod</code>, V's generated C code usually performs well. However, in specialized
scenarios, additional compiler flags and attributes can further optimize the executable for
performance, memory usage, or size.</p>
<blockquote class="tip">
<p>[!NOTE]
These are <em>rarely</em> needed, and should not be used unless you
<em>profile your code</em>, and then see that there are significant benefits for them.
To cite GCC's documentation: "Programmers are notoriously bad at predicting
how their programs actually perform".</p>
</blockquote>
<table>
<thead>
<tr>
<th>Tuning Operation</th>
<th>Benefits</th>
<th>Drawbacks</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>@[inline]</code></td>
<td>Performance</td>
<td>Increased executable size</td>
</tr>
<tr>
<td><code>@[direct_array_access]</code></td>
<td>Performance</td>
<td>Safety risks</td>
</tr>
<tr>
<td><code>@[packed]</code></td>
<td>Memory usage</td>
<td>Potential performance loss</td>
</tr>
<tr>
<td><code>@[minify]</code></td>
<td>Performance, Memory usage</td>
<td>May break binary serialization/reflection</td>
</tr>
<tr>
<td><code>_likely_/_unlikely_</code></td>
<td>Performance</td>
<td>Risk of negative performance impact</td>
</tr>
<tr>
<td><code>-fast-math</code></td>
<td>Performance</td>
<td>Risk of incorrect mathematical operations results</td>
</tr>
<tr>
<td><code>-d no_segfault_handler</code></td>
<td>Compile time, Size</td>
<td>Loss of segfault trace</td>
</tr>