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//===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// The EdgeBundles analysis forms equivalence classes of CFG edges such that all
// edges leaving a machine basic block are in the same bundle, and all edges
// entering a machine basic block are in the same bundle.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_EDGEBUNDLES_H
#define LLVM_CODEGEN_EDGEBUNDLES_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/IntEqClasses.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
namespace llvm {
class EdgeBundles : public MachineFunctionPass {
const MachineFunction *MF = nullptr;
/// EC - Each edge bundle is an equivalence class. The keys are:
/// 2*BB->getNumber() -> Ingoing bundle.
/// 2*BB->getNumber()+1 -> Outgoing bundle.
IntEqClasses EC;
/// Blocks - Map each bundle to a list of basic block numbers.
SmallVector<SmallVector<unsigned, 8>, 4> Blocks;
public:
static char ID;
EdgeBundles() : MachineFunctionPass(ID) {}
/// 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]; }
/// getNumBundles - Return the total number of bundles in the CFG.
unsigned getNumBundles() const { return EC.getNumClasses(); }
/// getBlocks - Return an array of blocks that are connected to Bundle.
ArrayRef<unsigned> getBlocks(unsigned Bundle) const { return Blocks[Bundle]; }
/// getMachineFunction - Return the last machine function computed.
const MachineFunction *getMachineFunction() const { return MF; }
/// view - Visualize the annotated bipartite CFG with Graphviz.
void view() const;
private:
bool runOnMachineFunction(MachineFunction&) override;
void getAnalysisUsage(AnalysisUsage&) const override;
};
} // end namespace llvm
#endif
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