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annotate lib/CodeGen/AntiDepBreaker.h @ 134:3a76565eade5 LLVM5.0.1

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update 5.0.1
author mir3636
date Sat, 17 Feb 2018 09:57:20 +0900
parents 803732b1fca8
children c2174574ed3a
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1 //===- llvm/CodeGen/AntiDepBreaker.h - Anti-Dependence Breaking -*- C++ -*-===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the AntiDepBreaker class, which implements
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11 // anti-dependence breaking heuristics for post-register-allocation scheduling.
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12 //
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13 //===----------------------------------------------------------------------===//
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15 #ifndef LLVM_LIB_CODEGEN_ANTIDEPBREAKER_H
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16 #define LLVM_LIB_CODEGEN_ANTIDEPBREAKER_H
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18 #include "llvm/ADT/iterator_range.h"
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19 #include "llvm/CodeGen/MachineBasicBlock.h"
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20 #include "llvm/CodeGen/MachineInstr.h"
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21 #include "llvm/CodeGen/MachineOperand.h"
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22 #include "llvm/CodeGen/ScheduleDAG.h"
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23 #include "llvm/Support/Compiler.h"
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24 #include <cassert>
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25 #include <utility>
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26 #include <vector>
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27
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28 namespace llvm {
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30 /// This class works in conjunction with the post-RA scheduler to rename
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31 /// registers to break register anti-dependencies (WAR hazards).
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32 class LLVM_LIBRARY_VISIBILITY AntiDepBreaker {
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33 public:
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34 using DbgValueVector =
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35 std::vector<std::pair<MachineInstr *, MachineInstr *>>;
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37 virtual ~AntiDepBreaker();
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38
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39 /// Initialize anti-dep breaking for a new basic block.
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40 virtual void StartBlock(MachineBasicBlock *BB) = 0;
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42 /// Identifiy anti-dependencies within a basic-block region and break them by
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43 /// renaming registers. Return the number of anti-dependencies broken.
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44 virtual unsigned BreakAntiDependencies(const std::vector<SUnit> &SUnits,
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45 MachineBasicBlock::iterator Begin,
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46 MachineBasicBlock::iterator End,
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47 unsigned InsertPosIndex,
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48 DbgValueVector &DbgValues) = 0;
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50 /// Update liveness information to account for the current
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51 /// instruction, which will not be scheduled.
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52 virtual void Observe(MachineInstr &MI, unsigned Count,
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53 unsigned InsertPosIndex) = 0;
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54
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55 /// Finish anti-dep breaking for a basic block.
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56 virtual void FinishBlock() = 0;
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58 /// Update DBG_VALUE if dependency breaker is updating
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59 /// other machine instruction to use NewReg.
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60 void UpdateDbgValue(MachineInstr &MI, unsigned OldReg, unsigned NewReg) {
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61 assert(MI.isDebugValue() && "MI is not DBG_VALUE!");
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62 if (MI.getOperand(0).isReg() && MI.getOperand(0).getReg() == OldReg)
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63 MI.getOperand(0).setReg(NewReg);
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64 }
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66 /// Update all DBG_VALUE instructions that may be affected by the dependency
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67 /// breaker's update of ParentMI to use NewReg.
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68 void UpdateDbgValues(const DbgValueVector &DbgValues, MachineInstr *ParentMI,
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69 unsigned OldReg, unsigned NewReg) {
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70 // The following code is dependent on the order in which the DbgValues are
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71 // constructed in ScheduleDAGInstrs::buildSchedGraph.
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72 MachineInstr *PrevDbgMI = nullptr;
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73 for (const auto &DV : make_range(DbgValues.crbegin(), DbgValues.crend())) {
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74 MachineInstr *PrevMI = DV.second;
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75 if ((PrevMI == ParentMI) || (PrevMI == PrevDbgMI)) {
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76 MachineInstr *DbgMI = DV.first;
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77 UpdateDbgValue(*DbgMI, OldReg, NewReg);
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78 PrevDbgMI = DbgMI;
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79 } else if (PrevDbgMI) {
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80 break; // If no match and already found a DBG_VALUE, we're done.
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81 }
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82 }
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83 }
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84 };
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86 } // end namespace llvm
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88 #endif // LLVM_LIB_CODEGEN_ANTIDEPBREAKER_H