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| author | Dan Gohman <gohman@apple.com> | 2008-09-10 22:23:41 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-09-10 22:23:41 +0000 |
| commit | 8c9c55fb48f2fd07f5a1aad3eb2204ad5af5fe78 (patch) | |
| tree | 6d54f64a690f9b6b1edaaad82d561dda6174dfa1 /docs/CodeGenerator.html | |
| parent | 78efce61559ae42a26724eb302d3da8be8a6ede0 (diff) | |
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
Diffstat (limited to 'docs/CodeGenerator.html')
| -rw-r--r-- | docs/CodeGenerator.html | 31 |
1 files changed, 21 insertions, 10 deletions
diff --git a/docs/CodeGenerator.html b/docs/CodeGenerator.html index afb6a433c2..ad0a5b5588 100644 --- a/docs/CodeGenerator.html +++ b/docs/CodeGenerator.html @@ -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> |