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<div class="section" id="working-with-gcc-s-tunable-parameters">
<h1>Working with GCC’s tunable parameters<a class="headerlink" href="#working-with-gcc-s-tunable-parameters" title="Permalink to this headline">¶</a></h1>
<p>GCC has numerous tunable parameters, which are integer values, tweakable at
the command-line by:</p>
<div class="highlight-bash"><div class="highlight"><pre>--param <name><span class="o">=</span><value>
</pre></div>
</div>
<p>A detailed description of the current parameters (in GCC 4.6.0) can be seen at
<a class="reference external" href="http://gcc.gnu.org/onlinedocs/gcc-4.6.0/gcc/Optimize-Options.html#Optimize-Options">http://gcc.gnu.org/onlinedocs/gcc-4.6.0/gcc/Optimize-Options.html#Optimize-Options</a>
(search for “–param” on that page; there doesn’t seem to be an anchor to the list)</p>
<p>The parameters are visible from Python scripts using the following API:</p>
<dl class="function">
<dt id="gcc.get_parameters">
<tt class="descclassname">gcc.</tt><tt class="descname">get_parameters</tt><big>(</big><big>)</big><a class="headerlink" href="#gcc.get_parameters" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a dictionary, mapping from the option names to <a class="reference internal" href="#gcc.Parameter" title="gcc.Parameter"><tt class="xref py py-class docutils literal"><span class="pre">gcc.Parameter</span></tt></a> instances</p>
</dd></dl>
<dl class="class">
<dt id="gcc.Parameter">
<em class="property">class </em><tt class="descclassname">gcc.</tt><tt class="descname">Parameter</tt><a class="headerlink" href="#gcc.Parameter" title="Permalink to this definition">¶</a></dt>
<dd><dl class="attribute">
<dt id="gcc.Parameter.option">
<tt class="descname">option</tt><a class="headerlink" href="#gcc.Parameter.option" title="Permalink to this definition">¶</a></dt>
<dd><p>(string) The name used with the command-line –param switch to set this value</p>
</dd></dl>
<dl class="attribute">
<dt id="gcc.Parameter.current_value">
<tt class="descname">current_value</tt><a class="headerlink" href="#gcc.Parameter.current_value" title="Permalink to this definition">¶</a></dt>
<dd><p>(int/long)</p>
</dd></dl>
<dl class="attribute">
<dt id="gcc.Parameter.default_value">
<tt class="descname">default_value</tt><a class="headerlink" href="#gcc.Parameter.default_value" title="Permalink to this definition">¶</a></dt>
<dd><p>(int/long)</p>
</dd></dl>
<dl class="attribute">
<dt id="gcc.Parameter.min_value">
<tt class="descname">min_value</tt><a class="headerlink" href="#gcc.Parameter.min_value" title="Permalink to this definition">¶</a></dt>
<dd><p>(int/long) The minimum acceptable value</p>
</dd></dl>
<dl class="attribute">
<dt id="gcc.Parameter.max_value">
<tt class="descname">max_value</tt><a class="headerlink" href="#gcc.Parameter.max_value" title="Permalink to this definition">¶</a></dt>
<dd><p>(int/long) The maximum acceptable value, if greater than min_value</p>
</dd></dl>
<dl class="attribute">
<dt id="gcc.Parameter.help">
<tt class="descname">help</tt><a class="headerlink" href="#gcc.Parameter.help" title="Permalink to this definition">¶</a></dt>
<dd><p>(string) A short description of the option.</p>
</dd></dl>
</dd></dl>
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