1 //== llvm/CodeGen/GlobalISel/LegalizePass.h ------------- -*- C++ -*-==//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 /// \file A pass to convert the target-illegal operations created by IR -> MIR
11 /// translation into ones the target expects to be able to select. This may
12 /// occur in multiple phases, for example G_ADD <2 x i8> -> G_ADD <2 x i16> ->
13 /// G_ADD <4 x i16>.
14 ///
15 /// The LegalizeHelper class is where most of the work happens, and is designed
16 /// to be callable from other passes that find themselves with an illegal
17 /// instruction.
18 //
19 //===----------------------------------------------------------------------===//
20 
21 #ifndef LLVM_CODEGEN_GLOBALISEL_LEGALIZEMACHINEIRPASS_H
22 #define LLVM_CODEGEN_GLOBALISEL_LEGALIZEMACHINEIRPASS_H
23 
24 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
25 #include "llvm/CodeGen/MachineFunctionPass.h"
26 
27 namespace llvm {
28 
29 class MachineRegisterInfo;
30 
31 class Legalizer : public MachineFunctionPass {
32 public:
33   static char ID;
34 
35 private:
36 
37   /// Initialize the field members using \p MF.
38   void init(MachineFunction &MF);
39 
40 public:
41   // Ctor, nothing fancy.
42   Legalizer();
43 
getPassName()44   StringRef getPassName() const override { return "Legalizer"; }
45 
46   void getAnalysisUsage(AnalysisUsage &AU) const override;
47 
getRequiredProperties()48   MachineFunctionProperties getRequiredProperties() const override {
49     return MachineFunctionProperties().set(
50         MachineFunctionProperties::Property::IsSSA);
51   }
52 
getSetProperties()53   MachineFunctionProperties getSetProperties() const override {
54     return MachineFunctionProperties().set(
55         MachineFunctionProperties::Property::Legalized);
56   }
57 
58   bool combineExtracts(MachineInstr &MI, MachineRegisterInfo &MRI,
59                        const TargetInstrInfo &TII);
60 
61   bool runOnMachineFunction(MachineFunction &MF) override;
62 };
63 } // End namespace llvm.
64 
65 #endif
66