LLVM  9.0.0svn
MipsPreLegalizerCombiner.cpp
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1 //=== lib/CodeGen/GlobalISel/MipsPreLegalizerCombiner.cpp --------------===//
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 // This pass does combining of machine instructions at the generic MI level,
10 // before the legalizer.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "MipsTargetMachine.h"
20 
21 #define DEBUG_TYPE "mips-prelegalizer-combiner"
22 
23 using namespace llvm;
24 
25 namespace {
26 class MipsPreLegalizerCombinerInfo : public CombinerInfo {
27 public:
28  MipsPreLegalizerCombinerInfo()
29  : CombinerInfo(/*AllowIllegalOps*/ true, /*ShouldLegalizeIllegal*/ false,
30  /*LegalizerInfo*/ nullptr) {}
31  virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI,
32  MachineIRBuilder &B) const override;
33 };
34 
35 bool MipsPreLegalizerCombinerInfo::combine(GISelChangeObserver &Observer,
37  MachineIRBuilder &B) const {
38  CombinerHelper Helper(Observer, B);
39 
40  switch (MI.getOpcode()) {
41  default:
42  return false;
43  case TargetOpcode::G_LOAD:
44  case TargetOpcode::G_SEXTLOAD:
45  case TargetOpcode::G_ZEXTLOAD:
46  return Helper.tryCombineExtendingLoads(MI);
47  }
48  return false;
49 }
50 
51 // Pass boilerplate
52 // ================
53 
54 class MipsPreLegalizerCombiner : public MachineFunctionPass {
55 public:
56  static char ID;
57 
58  MipsPreLegalizerCombiner();
59 
60  StringRef getPassName() const override { return "MipsPreLegalizerCombiner"; }
61 
62  bool runOnMachineFunction(MachineFunction &MF) override;
63 
64  void getAnalysisUsage(AnalysisUsage &AU) const override;
65 };
66 } // end anonymous namespace
67 
68 void MipsPreLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
70  AU.setPreservesCFG();
73 }
74 
75 MipsPreLegalizerCombiner::MipsPreLegalizerCombiner() : MachineFunctionPass(ID) {
77 }
78 
79 bool MipsPreLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
80  if (MF.getProperties().hasProperty(
82  return false;
83  auto *TPC = &getAnalysis<TargetPassConfig>();
84  MipsPreLegalizerCombinerInfo PCInfo;
85  Combiner C(PCInfo, TPC);
86  return C.combineMachineInstrs(MF, nullptr);
87 }
88 
90 INITIALIZE_PASS_BEGIN(MipsPreLegalizerCombiner, DEBUG_TYPE,
91  "Combine Mips machine instrs before legalization", false,
92  false)
94 INITIALIZE_PASS_END(MipsPreLegalizerCombiner, DEBUG_TYPE,
95  "Combine Mips machine instrs before legalization", false,
96  false)
97 
98 namespace llvm {
100  return new MipsPreLegalizerCombiner();
101 }
102 } // end namespace llvm
uint64_t CallInst * C
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
coro Split coroutine into a set of functions driving its state machine
Definition: CoroSplit.cpp:955
This class represents lattice values for constants.
Definition: AllocatorList.h:23
void getSelectionDAGFallbackAnalysisUsage(AnalysisUsage &AU)
Modify analysis usage so it preserves passes required for the SelectionDAG fallback.
Definition: Utils.cpp:364
const MachineFunctionProperties & getProperties() const
Get the function properties.
AnalysisUsage & addRequired()
#define INITIALIZE_PASS_DEPENDENCY(depName)
Definition: PassSupport.h:50
MachineFunctionPass - This class adapts the FunctionPass interface to allow convenient creation of pa...
unsigned getOpcode() const
Returns the opcode of this MachineInstr.
Definition: MachineInstr.h:410
Combine Mips machine instrs before legalization
Target-Independent Code Generator Pass Configuration Options.
Abstract class that contains various methods for clients to notify about changes. ...
static GCRegistry::Add< OcamlGC > B("ocaml", "ocaml 3.10-compatible GC")
void getAnalysisUsage(AnalysisUsage &AU) const override
getAnalysisUsage - Subclasses that override getAnalysisUsage must call this.
Helper class to build MachineInstr.
FunctionPass * createMipsPreLegalizeCombiner()
INITIALIZE_PASS_BEGIN(MipsPreLegalizerCombiner, DEBUG_TYPE, "Combine Mips machine instrs before legalization", false, false) INITIALIZE_PASS_END(MipsPreLegalizerCombiner
Represent the analysis usage information of a pass.
#define DEBUG_TYPE
bool tryCombineExtendingLoads(MachineInstr &MI)
If MI is extend that consumes the result of a load, try to combine it.
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:284
bool combineMachineInstrs(MachineFunction &MF, GISelCSEInfo *CSEInfo)
If CSEInfo is not null, then the Combiner will setup observer for CSEInfo and instantiate a CSEMIRBui...
Definition: Combiner.cpp:86
INITIALIZE_PASS_END(RegBankSelect, DEBUG_TYPE, "Assign register bank of generic virtual registers", false, false) RegBankSelect
void setPreservesCFG()
This function should be called by the pass, iff they do not:
Definition: Pass.cpp:301
Representation of each machine instruction.
Definition: MachineInstr.h:63
bool hasProperty(Property P) const
IRTranslator LLVM IR MI
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
void initializeMipsPreLegalizerCombinerPass(PassRegistry &)