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<div class="section" id="porting-globalisel-to-a-new-target">
<span id="porting"></span><h1>Porting GlobalISel to A New Target<a class="headerlink" href="#porting-globalisel-to-a-new-target" title="Permalink to this headline">¶</a></h1>
<p>There are four major classes to implement by the target:</p>
<ul class="simple">
<li><p><a class="reference internal" href="IRTranslator.html#translator-call-lower"><span class="std std-ref">CallLowering</span></a> — lower calls, returns, and
arguments according to the ABI.</p></li>
<li><p><a class="reference internal" href="RegBankSelect.html#api-registerbankinfo"><span class="std std-ref">RegisterBankInfo</span></a> — describe
<a class="reference internal" href="GMIR.html#gmir-regbank"><span class="std std-ref">Register Bank</span></a> coverage, cross-bank copy cost, and the mapping of
operands onto banks for each instruction.</p></li>
<li><p><a class="reference internal" href="Legalizer.html#api-legalizerinfo"><span class="std std-ref">LegalizerInfo</span></a> — describe what is legal, and how
to legalize what isn’t.</p></li>
<li><p><a class="reference internal" href="InstructionSelect.html#api-instructionselector"><span class="std std-ref">InstructionSelector</span></a> — select generic MIR
to target-specific MIR.</p></li>
</ul>
<p>Additionally:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">TargetPassConfig</span></code> — create the passes constituting the pipeline,
including additional passes not included in the <a class="reference internal" href="Pipeline.html#pipeline"><span class="std std-ref">Core Pipeline</span></a>.</p></li>
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<div class="section" id="tutorials">
<h1>Tutorials<a class="headerlink" href="#tutorials" title="Permalink to this headline">¶</a></h1>
<p>We’d recommend watching <a class="reference external" href="https://www.llvm.org/devmtg/2017-10/#tutorial2">this tutorial</a> from the 2017 LLVM DevMeeting
which gave an overview of how to bring up a new backend in GlobalISel.</p>
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