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; |
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 | |
55 | private: |
56 | bool runOnMachineFunction(MachineFunction&) override; |
57 | void getAnalysisUsage(AnalysisUsage&) const override; |
58 | }; |
59 | |
60 | } // end namespace llvm |
61 | |
62 | #endif |
63 | |