LeonPasses.h

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//===------- LeonPasses.h - Define passes specific to LEON ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_LIB_TARGET_SPARC_LEON_PASSES_H
#define LLVM_LIB_TARGET_SPARC_LEON_PASSES_H
 
#include "llvm/CodeGen/MachineFunctionPass.h"
 
namespace llvm {
class SparcSubtarget;
 
class LLVM_LIBRARY_VISIBILITY LEONMachineFunctionPass
    : public MachineFunctionPass {
protected:
  const SparcSubtarget *Subtarget = nullptr;
  const int LAST_OPERAND = -1;
 
  // this vector holds free registers that we allocate in groups for some of the
  // LEON passes
  std::vector<int> UsedRegisters;
 
protected:
  LEONMachineFunctionPass(char &ID);
 
  void clearUsedRegisterList() { UsedRegisters.clear(); }
 
  void markRegisterUsed(int registerIndex) {
    UsedRegisters.push_back(registerIndex);
  }
};
 
class LLVM_LIBRARY_VISIBILITY ErrataWorkaround : public MachineFunctionPass {
protected:
  const SparcSubtarget *ST;
  const TargetInstrInfo *TII;
  const TargetRegisterInfo *TRI;
 
  bool checkSeqTN0009A(MachineBasicBlock::iterator I);
  bool checkSeqTN0009B(MachineBasicBlock::iterator I);
  bool checkSeqTN0010First(MachineBasicBlock &MBB);
  bool checkSeqTN0010(MachineBasicBlock::iterator I);
  bool checkSeqTN0012(MachineBasicBlock::iterator I);
  bool checkSeqTN0013(MachineBasicBlock::iterator I);
 
  bool moveNext(MachineBasicBlock::iterator &I);
  bool isFloat(MachineBasicBlock::iterator I);
  bool isDivSqrt(MachineBasicBlock::iterator I);
  bool isAtomic(MachineBasicBlock::iterator I);
  void insertNop(MachineBasicBlock::iterator I);
 
public:
  static char ID;
 
  ErrataWorkaround();
  bool runOnMachineFunction(MachineFunction &MF) override;
 
  StringRef getPassName() const override { return "Errata workaround pass"; };
};
 
class LLVM_LIBRARY_VISIBILITY InsertNOPLoad : public LEONMachineFunctionPass {
public:
  static char ID;
 
  InsertNOPLoad();
  bool runOnMachineFunction(MachineFunction &MF) override;
 
  StringRef getPassName() const override {
    return "InsertNOPLoad: Erratum Fix LBR35: insert a NOP instruction after "
           "every single-cycle load instruction when the next instruction is "
           "another load/store instruction";
  }
};
 
class LLVM_LIBRARY_VISIBILITY DetectRoundChange
    : public LEONMachineFunctionPass {
public:
  static char ID;
 
  DetectRoundChange();
  bool runOnMachineFunction(MachineFunction &MF) override;
 
  StringRef getPassName() const override {
    return "DetectRoundChange: Leon erratum detection: detect any rounding "
           "mode change request: use only the round-to-nearest rounding mode";
  }
};
 
class LLVM_LIBRARY_VISIBILITY FixAllFDIVSQRT : public LEONMachineFunctionPass {
public:
  static char ID;
 
  FixAllFDIVSQRT();
  bool runOnMachineFunction(MachineFunction &MF) override;
 
  StringRef getPassName() const override {
    return "FixAllFDIVSQRT: Erratum Fix LBR34: fix FDIVS/FDIVD/FSQRTS/FSQRTD "
           "instructions with NOPs and floating-point store";
  }
};
} // namespace llvm
 
#endif // LLVM_LIB_TARGET_SPARC_LEON_PASSES_H