Turn the EdgeBundles class into a stand-alone machine CFG analysis pass.

The analysis will be needed by both the greedy register allocator and the
X86FloatingPoint pass. It only needs to be computed once when the CFG doesn't
change.

This pass is very fast, usually showing up as 0.0% wall time.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122832 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 37 deletions

diff --git a/lib/CodeGen/SplitKit.h b/lib/CodeGen/SplitKit.h
index a6ba37610a..236986e4af 100644
--- a/lib/CodeGen/SplitKit.h
+++ b/lib/CodeGen/SplitKit.h
@@ -1,4 +1,4 @@
-//===-------- SplitKit.cpp - Toolkit for splitting live ranges --*- C++ -*-===//
+//===-------- SplitKit.h - Toolkit for splitting live ranges ----*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
@@ -13,12 +13,9 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/IntEqClasses.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/CodeGen/SlotIndexes.h"
 
-#include <string>
-
 namespace llvm {
 
 class LiveInterval;
@@ -40,39 +37,6 @@ template <class NodeT> class DomTreeNodeBase;
 typedef DomTreeNodeBase<MachineBasicBlock> MachineDomTreeNode;
 
 
-/// EdgeBundles - Group CFG edges into equivalence classes where registers must
-/// be allocated identically. This annotates the CFG to form a bipartite graph
-/// where each block is connected to an ingoing and an outgoing bundle.
-/// Edge bundles are simply numbered, there is no object representation.
-class EdgeBundles {
-  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:
-  /// compute - Compute the edge bundles for MF. Bundles depend only on the CFG.
-  void compute(const MachineFunction *MF);
-
-  /// 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;
-};
-
-/// Specialize WriteGraph, the standard implementation won't work.
-raw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G,
-                        bool ShortNames = false,
-                        const std::string &Title = "");
-
-
 /// SplitAnalysis - Analyze a LiveInterval, looking for live range splitting
 /// opportunities.
 class SplitAnalysis {