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 22namespace llvm { 23 24class EdgeBundles : public MachineFunctionPass { 25 const MachineFunction *MF; 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 35public: 36 static char ID; 37 EdgeBundles() : MachineFunctionPass(ID) {} 38 39 /// getBundle - Return the ingoing (Out = false) or outgoing (Out = true) 40 /// bundle number for basic block #N 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. 44 unsigned getNumBundles() const { return EC.getNumClasses(); } 45 46 /// getBlocks - Return an array of blocks that are connected to Bundle. 47 ArrayRef<unsigned> getBlocks(unsigned Bundle) const { return Blocks[Bundle]; } 48 49 /// getMachineFunction - Return the last machine function computed. 50 const MachineFunction *getMachineFunction() const { return MF; } 51 52 /// view - Visualize the annotated bipartite CFG with Graphviz. 53 void view() const; 54 55private: 56 bool runOnMachineFunction(MachineFunction&) override; 57 void getAnalysisUsage(AnalysisUsage&) const override; 58}; 59 60} // end namespace llvm 61 62#endif 63