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