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add options to view the dags before the first or second pass of dag combine. 

llvm-svn: 33249
This commit is contained in:
Chris Lattner 2007-01-16 04:55:25 +00:00
parent 841d20cd16
commit f70c5cd5db
1 changed files with 18 additions and 0 deletions
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18
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -46,6 +46,20 @@ STATISTIC(PreIndexedNodes , "Number of pre-indexed nodes created");
STATISTIC(PostIndexedNodes, "Number of post-indexed nodes created"); STATISTIC(PostIndexedNodes, "Number of post-indexed nodes created");
namespace { namespace {
#ifndef NDEBUG
static cl::opt<bool>
ViewDAGCombine1("view-dag-combine1-dags", cl::Hidden,
cl::desc("Pop up a window to show dags before the first "
"dag combine pass"));
static cl::opt<bool>
ViewDAGCombine2("view-dag-combine2-dags", cl::Hidden,
cl::desc("Pop up a window to show dags before the second "
"dag combine pass"));
#else
static const bool ViewDAGCombine1 = false;
static const bool ViewDAGCombine2 = false;
#endif
static cl::opt<bool> static cl::opt<bool>
CombinerAA("combiner-alias-analysis", cl::Hidden, CombinerAA("combiner-alias-analysis", cl::Hidden,
cl::desc("Turn on alias analysis during testing")); cl::desc("Turn on alias analysis during testing"));
@ -4512,6 +4526,10 @@ SDOperand DAGCombiner::FindBetterChain(SDNode *N, SDOperand OldChain) {
// SelectionDAG::Combine - This is the entry point for the file. // SelectionDAG::Combine - This is the entry point for the file.
// //
void SelectionDAG::Combine(bool RunningAfterLegalize, AliasAnalysis &AA) { void SelectionDAG::Combine(bool RunningAfterLegalize, AliasAnalysis &AA) {
if (!RunningAfterLegalize && ViewDAGCombine1)
viewGraph();
if (RunningAfterLegalize && ViewDAGCombine2)
viewGraph();
/// run - This is the main entry point to this class. /// run - This is the main entry point to this class.
/// ///
DAGCombiner(*this, AA).Run(RunningAfterLegalize); DAGCombiner(*this, AA).Run(RunningAfterLegalize);