include/llvm/CodeGen/GlobalISel/Legalizer.h

   1 //== llvm/CodeGen/GlobalISel/Legalizer.h ---------------- -*- 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 /// \file A pass to convert the target-illegal operations created by IR -> MIR
  10 /// translation into ones the target expects to be able to select. This may
  11 /// occur in multiple phases, for example G_ADD <2 x i8> -> G_ADD <2 x i16> ->
  12 /// G_ADD <4 x i16>.
  13 ///
  14 /// The LegalizeHelper class is where most of the work happens, and is designed
  15 /// to be callable from other passes that find themselves with an illegal
  16 /// instruction.
  17 //
  18 //===----------------------------------------------------------------------===//
  19
  20 #ifndef LLVM_CODEGEN_GLOBALISEL_LEGALIZEMACHINEIRPASS_H
  21 #define LLVM_CODEGEN_GLOBALISEL_LEGALIZEMACHINEIRPASS_H
  22
  23 #include "llvm/CodeGen/GlobalISel/MachineIRBuilder.h"
  24 #include "llvm/CodeGen/MachineFunctionPass.h"
  25
  26 namespace llvm {
  27
  28 class MachineRegisterInfo;
  29
  30 class Legalizer : public MachineFunctionPass {
  31 public:
  32   static char ID;
  33
  34 private:
  35
  36   /// Initialize the field members using \p MF.
  37   void init(MachineFunction &MF);
  38
  39 public:
  40   // Ctor, nothing fancy.
  41   Legalizer();
  42
  43   StringRef getPassName() const override { return "Legalizer"; }
  44
  45   void getAnalysisUsage(AnalysisUsage &AU) const override;
  46
  47   MachineFunctionProperties getRequiredProperties() const override {
  48     return MachineFunctionProperties().set(
  49         MachineFunctionProperties::Property::IsSSA);
  50   }
  51
  52   MachineFunctionProperties getSetProperties() const override {
  53     return MachineFunctionProperties().set(
  54         MachineFunctionProperties::Property::Legalized);
  55   }
  56
  57   MachineFunctionProperties getClearedProperties() const override {
  58     return MachineFunctionProperties()
  59       .set(MachineFunctionProperties::Property::NoPHIs);
  60   }
  61
  62   bool combineExtracts(MachineInstr &MI, MachineRegisterInfo &MRI,
  63                        const TargetInstrInfo &TII);
  64
  65   bool runOnMachineFunction(MachineFunction &MF) override;
  66 };
  67 } // End namespace llvm.
  68
  69 #endif