1 //===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // The EdgeBundles analysis forms equivalence classes of CFG edges such that all 10 // edges leaving a machine basic block are in the same bundle, and all edges 11 // entering a machine basic block are in the same bundle. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_CODEGEN_EDGEBUNDLES_H 16 #define LLVM_CODEGEN_EDGEBUNDLES_H 17 18 #include "llvm/ADT/ArrayRef.h" 19 #include "llvm/ADT/IntEqClasses.h" 20 #include "llvm/CodeGen/MachineFunctionPass.h" 21 22 namespace llvm { 23 24 class EdgeBundles : public MachineFunctionPass { 25 const MachineFunction *MF = nullptr; 26 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. 30 IntEqClasses EC; 31 32 /// Blocks - Map each bundle to a list of basic block numbers. 33 SmallVector<SmallVector<unsigned, 8>, 4> Blocks; 34 35 public: 36 static char ID; EdgeBundles()37 EdgeBundles() : MachineFunctionPass(ID) {} 38 39 /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true) 40 /// bundle number for basic block #N getBundle(unsigned N,bool Out)41 unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; } 42 43 /// getNumBundles - Return the total number of bundles in the CFG. getNumBundles()44 unsigned getNumBundles() const { return EC.getNumClasses(); } 45 46 /// getBlocks - Return an array of blocks that are connected to Bundle. getBlocks(unsigned Bundle)47 ArrayRef<unsigned> getBlocks(unsigned Bundle) const { return Blocks[Bundle]; } 48 49 /// getMachineFunction - Return the last machine function computed. getMachineFunction()50 const MachineFunction *getMachineFunction() const { return MF; } 51 52 /// view - Visualize the annotated bipartite CFG with Graphviz. 53 void view() const; 54 55 private: 56 bool runOnMachineFunction(MachineFunction&) override; 57 void getAnalysisUsage(AnalysisUsage&) const override; 58 }; 59 60 } // end namespace llvm 61 62 #endif 63