1 //===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // The EdgeBundles analysis forms equivalence classes of CFG edges such that all
11 // edges leaving a machine basic block are in the same bundle, and all edges
12 // leaving a basic block are in the same bundle.
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_CODEGEN_EDGEBUNDLES_H
17 #define LLVM_CODEGEN_EDGEBUNDLES_H
19 #include "llvm/ADT/IntEqClasses.h"
20 #include "llvm/CodeGen/MachineFunctionPass.h"
24 class EdgeBundles : public MachineFunctionPass {
25 const MachineFunction *MF;
27 /// EC - Each edge bundle is an equivalence class. The keys are:
28 /// 2*BB->getNumber() -> Ingoing bundle.
29 /// 2*BB->getNumber()+1 -> Outgoing bundle.
34 EdgeBundles() : MachineFunctionPass(ID) {}
36 /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true)
37 /// bundle number for basic block #N
38 unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; }
40 /// getNumBundles - Return the total number of bundles in the CFG.
41 unsigned getNumBundles() const { return EC.getNumClasses(); }
43 /// getMachineFunction - Return the last machine function computed.
44 const MachineFunction *getMachineFunction() const { return MF; }
46 /// view - Visualize the annotated bipartite CFG with Graphviz.
50 virtual bool runOnMachineFunction(MachineFunction&);
51 virtual void getAnalysisUsage(AnalysisUsage&) const;
54 /// Specialize WriteGraph, the standard implementation won't work.
55 raw_ostream &WriteGraph(raw_ostream &O, const EdgeBundles &G,
56 bool ShortNames = false,
57 const std::string &Title = "");
59 } // end namespace llvm