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Document -view-isel-dags and -view-sched-dags

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23766 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2005-10-17 01:40:33 +00:00
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docs/CodeGenerator.html
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@ -828,6 +828,15 @@ SelectionDAG-based instruction selection consists of the following steps:
<p>After all of these steps are complete, the SelectionDAG is destroyed and the <p>After all of these steps are complete, the SelectionDAG is destroyed and the
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
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.
</p>
</div> </div>
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