Add a new -view-legalize-dags command line option
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27342 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
index e689bdc..f3d2fdf 100644
--- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
@@ -14,16 +14,25 @@
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/Support/MathExtras.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/CallingConv.h"
#include "llvm/Constants.h"
+#include "llvm/Support/MathExtras.h"
+#include "llvm/Support/CommandLine.h"
#include <iostream>
#include <map>
using namespace llvm;
+#ifndef NDEBUG
+static cl::opt<bool>
+ViewLegalizeDAGs("view-legalize-dags", cl::Hidden,
+ cl::desc("Pop up a window to show dags before legalize"));
+#else
+static const bool ViewLegalizeDAGs = 0;
+#endif
+
//===----------------------------------------------------------------------===//
/// SelectionDAGLegalize - This takes an arbitrary SelectionDAG as input and
/// hacks on it until the target machine can handle it. This involves
@@ -4628,6 +4637,8 @@
// SelectionDAG::Legalize - This is the entry point for the file.
//
void SelectionDAG::Legalize() {
+ if (ViewLegalizeDAGs) viewGraph();
+
/// run - This is the main entry point to this class.
///
SelectionDAGLegalize(*this).LegalizeDAG();