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Add more documentation advertising the -view-*-dags options.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56073 91177308-0d34-0410-b5e6-96231b3b80d8
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Dan Gohman 2008-09-10 22:23:41 +00:00
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docs/CodeGenerator.html
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@ -857,16 +857,27 @@ an illegal DAG into a legal DAG.</p>
rest of the code generation passes are run.</p>
<p>One great way to visualize what is going on here is to take advantage of a
few LLC command line options. In particular, the <tt>-view-isel-dags</tt>
option pops up a window with the SelectionDAG input to the Select phase for all
of the code compiled (if you only get errors printed to the console while using
this, you probably <a href="ProgrammersManual.html#ViewGraph">need to configure
your system</a> to add support for it). The <tt>-view-sched-dags</tt> option
views the SelectionDAG output from the Select phase and input to the Scheduler
phase. The <tt>-view-sunit-dags</tt> option views the ScheduleDAG, which is
based on the final SelectionDAG, with nodes that must be scheduled as a unit
bundled together into a single node, and with immediate operands and other
nodes that aren't relevent for scheduling omitted.
few LLC command line options. The following options pop up a window displaying
the SelectionDAG at specific times (if you only get errors printed to the console
while using this, you probably
<a href="ProgrammersManual.html#ViewGraph">need to configure your system</a> to
add support for it).</p>
<ul>
<li><tt>-view-dag-combine1-dags</tt> displays the DAG after being built, before
the first optimization pass.</li>
<li><tt>-view-legalize-dags</tt> displays the DAG before Legalization.</li>
<li><tt>-view-dag-combine2-dags</tt> displays the DAG before the second
optimization pass.</li>
<li><tt>-view-isel-dags</tt> displays the DAG before the Select phase.</li>
<li><tt>-view-sched-dags</tt> displays the DAG before Scheduling.</li>
</ul>
<p>The <tt>-view-sunit-dags</tt> displays the Scheduler's dependency graph.
This graph is based on the final SelectionDAG, with nodes that must be
scheduled together bundled into a single scheduling-unit node, and with
immediate operands and other nodes that aren't relevent for scheduling
omitted.
</p>
</div>