3 files changed, 63 insertions, 0 deletions
diff --git a/llvm/include/llvm/CodeGen/EdgeBundles.h b/llvm/include/llvm/CodeGen/EdgeBundles.h
new file mode 100644
index 0000000..0929d93
--- /dev/null
+++ b/llvm/include/llvm/CodeGen/EdgeBundles.h
@@ -0,0 +1,58 @@
+//===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// The EdgeBundles analysis forms equivalence classes of CFG edges such that all
+// edges leaving a machine basic block are in the same bundle, and all edges
+// leaving a basic block are in the same bundle.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_EDGEBUNDLES_H
+#define LLVM_CODEGEN_EDGEBUNDLES_H
+
+#include "llvm/ADT/IntEqClasses.h"
+#include "llvm/CodeGen/MachineFunctionPass.h"
+
+namespace llvm {
+
+class EdgeBundles : public MachineFunctionPass {
+  const MachineFunction *MF;
+
+  /// EC - Each edge bundle is an equivalence class. The keys are:
+  ///   2*BB->getNumber()   -> Ingoing bundle.
+  ///   2*BB->getNumber()+1 -> Outgoing bundle.
+  IntEqClasses EC;
+
+public:
+  static char ID;
+  EdgeBundles() : MachineFunctionPass(ID) {}
+
+  /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true)
+  /// bundle number for basic block #N
+  unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; }
+
+  /// getMachineFunction - Return the last machine function computed.
+  const MachineFunction *getMachineFunction() const { return MF; }
+
+  /// view - Visualize the annotated bipartite CFG with Graphviz.
+  void view() const;
+
+private:
+  virtual bool runOnMachineFunction(MachineFunction&);
+  virtual void getAnalysisUsage(AnalysisUsage&) const;
+};
+
+/// Specialize WriteGraph, the standard implementation won't work.
+raw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G,
+                        bool ShortNames = false,
+                        const std::string &Title = "");
+
+} // end namespace llvm
+
+#endif
diff --git a/llvm/include/llvm/CodeGen/Passes.h b/llvm/include/llvm/CodeGen/Passes.h
index d4ed994..6f53d34 100644
--- a/llvm/include/llvm/CodeGen/Passes.h
+++ b/llvm/include/llvm/CodeGen/Passes.h
@@ -54,6 +54,10 @@ namespace llvm {
   ///
   extern char &MachineDominatorsID;
 
+  /// EdgeBundles analysis - Bundle machine CFG edges.
+  ///
+  extern char &EdgeBundlesID;
+
   /// PHIElimination pass - This pass eliminates machine instruction PHI nodes
   /// by inserting copy instructions.  This destroys SSA information, but is the
   /// desired input for some register allocators.  This pass is "required" by
diff --git a/llvm/include/llvm/InitializePasses.h b/llvm/include/llvm/InitializePasses.h
index c89d4fe..dc45716 100644
--- a/llvm/include/llvm/InitializePasses.h
+++ b/llvm/include/llvm/InitializePasses.h
@@ -91,6 +91,7 @@ void initializeDomPrinterPass(PassRegistry&);
 void initializeDomViewerPass(PassRegistry&);
 void initializeDominanceFrontierPass(PassRegistry&);
 void initializeDominatorTreePass(PassRegistry&);
+void initializeEdgeBundlesPass(PassRegistry&);
 void initializeEdgeProfilerPass(PassRegistry&);
 void initializeEarlyCSEPass(PassRegistry&);
 void initializeExpandISelPseudosPass(PassRegistry&);