1//===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 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. 13// 14//===----------------------------------------------------------------------===// 15 16#ifndef LLVM_CODEGEN_EDGEBUNDLES_H 17#define LLVM_CODEGEN_EDGEBUNDLES_H 18 19#include "llvm/ADT/ArrayRef.h" 20#include "llvm/ADT/IntEqClasses.h" 21#include "llvm/ADT/Twine.h" 22#include "llvm/CodeGen/MachineFunctionPass.h" 23 24namespace llvm { 25 26class EdgeBundles : public MachineFunctionPass { 27 const MachineFunction *MF; 28 29 /// EC - Each edge bundle is an equivalence class. The keys are: 30 /// 2*BB->getNumber() -> Ingoing bundle. 31 /// 2*BB->getNumber()+1 -> Outgoing bundle. 32 IntEqClasses EC; 33 34 /// Blocks - Map each bundle to a list of basic block numbers. 35 SmallVector<SmallVector<unsigned, 8>, 4> Blocks; 36 37public: 38 static char ID; 39 EdgeBundles() : MachineFunctionPass(ID) {} 40 41 /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true) 42 /// bundle number for basic block #N 43 unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; } 44 45 /// getNumBundles - Return the total number of bundles in the CFG. 46 unsigned getNumBundles() const { return EC.getNumClasses(); } 47 48 /// getBlocks - Return an array of blocks that are connected to Bundle. 49 ArrayRef<unsigned> getBlocks(unsigned Bundle) const { return Blocks[Bundle]; } 50 51 /// getMachineFunction - Return the last machine function computed. 52 const MachineFunction *getMachineFunction() const { return MF; } 53 54 /// view - Visualize the annotated bipartite CFG with Graphviz. 55 void view() const; 56 57private: 58 bool runOnMachineFunction(MachineFunction&) override; 59 void getAnalysisUsage(AnalysisUsage&) const override; 60}; 61 62} // end namespace llvm 63 64#endif 65