//===-------- EdgeBundles.h - Bundles of CFG edges --------------*- c++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// The EdgeBundles analysis forms equivalence classes of CFG edges such that all
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// edges leaving a machine basic block are in the same bundle, and all edges
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// leaving a basic block are in the same bundle.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_EDGEBUNDLES_H
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#define LLVM_CODEGEN_EDGEBUNDLES_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/IntEqClasses.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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namespace llvm {
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class EdgeBundles : public MachineFunctionPass {
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const MachineFunction *MF;
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/// EC - Each edge bundle is an equivalence class. The keys are:
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/// 2*BB->getNumber() -> Ingoing bundle.
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/// 2*BB->getNumber()+1 -> Outgoing bundle.
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IntEqClasses EC;
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/// Blocks - Map each bundle to a list of basic block numbers.
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SmallVector<SmallVector<unsigned, 8>, 4> Blocks;
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public:
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static char ID;
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EdgeBundles() : MachineFunctionPass(ID) {}
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/// getBundle - Return the ingoing (Out = false) or outgoing (Out = true)
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/// bundle number for basic block #N
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unsigned getBundle(unsigned N, bool Out) const { return EC[2 * N + Out]; }
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/// getNumBundles - Return the total number of bundles in the CFG.
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unsigned getNumBundles() const { return EC.getNumClasses(); }
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/// getBlocks - Return an array of blocks that are connected to Bundle.
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ArrayRef<unsigned> getBlocks(unsigned Bundle) const { return Blocks[Bundle]; }
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/// getMachineFunction - Return the last machine function computed.
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const MachineFunction *getMachineFunction() const { return MF; }
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/// view - Visualize the annotated bipartite CFG with Graphviz.
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void view() const;
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private:
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bool runOnMachineFunction(MachineFunction&) override;
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void getAnalysisUsage(AnalysisUsage&) const override;
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};
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} // end namespace llvm
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#endif
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