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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
parent 78efce6155
commit 8c9c55fb48
1 changed files with 21 additions and 10 deletions
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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> 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 <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> few LLC command line options. The following options pop up a window displaying
option pops up a window with the SelectionDAG input to the Select phase for all the SelectionDAG at specific times (if you only get errors printed to the console
of the code compiled (if you only get errors printed to the console while using while using this, you probably
this, you probably <a href="ProgrammersManual.html#ViewGraph">need to configure <a href="ProgrammersManual.html#ViewGraph">need to configure your system</a> to
your system</a> to add support for it). The <tt>-view-sched-dags</tt> option add support for it).</p>
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 <ul>
based on the final SelectionDAG, with nodes that must be scheduled as a unit <li><tt>-view-dag-combine1-dags</tt> displays the DAG after being built, before
bundled together into a single node, and with immediate operands and other the first optimization pass.</li>
nodes that aren't relevent for scheduling omitted. <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> </p>
</div> </div>