HexagonInstPrinter.cpp

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//===- HexagonInstPrinter.cpp - Convert Hexagon MCInst to assembly syntax -===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This class prints an Hexagon MCInst to a .s file.
//
//===----------------------------------------------------------------------===//

#include "HexagonInstPrinter.h"
#include "MCTargetDesc/HexagonBaseInfo.h"
#include "MCTargetDesc/HexagonMCInstrInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

#define DEBUG_TYPE "asm-printer"

#define GET_INSTRUCTION_NAME
#include "HexagonGenAsmWriter.inc"

void HexagonInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
  O << getRegisterName(RegNo);
}

void HexagonInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
                                   StringRef Annot, const MCSubtargetInfo &STI) {
  assert(HexagonMCInstrInfo::isBundle(*MI));
  assert(HexagonMCInstrInfo::bundleSize(*MI) <= HEXAGON_PACKET_SIZE);
  assert(HexagonMCInstrInfo::bundleSize(*MI) > 0);
  HasExtender = false;
  for (auto const &I : HexagonMCInstrInfo::bundleInstructions(*MI)) {
    MCInst const &MCI = *I.getInst();
    if (HexagonMCInstrInfo::isDuplex(MII, MCI)) {
      printInstruction(MCI.getOperand(1).getInst(), OS);
      OS << '\v';
      HasExtender = false;
      printInstruction(MCI.getOperand(0).getInst(), OS);
    } else
      printInstruction(&MCI, OS);
    HasExtender = HexagonMCInstrInfo::isImmext(MCI);
    OS << "\n";
  }

  bool IsLoop0 = HexagonMCInstrInfo::isInnerLoop(*MI);
  bool IsLoop1 = HexagonMCInstrInfo::isOuterLoop(*MI);
  if (IsLoop0) {
    OS << (IsLoop1 ? " :endloop01" : " :endloop0");
  } else if (IsLoop1) {
    OS << " :endloop1";
  }
}

void HexagonInstPrinter::printOperand(MCInst const *MI, unsigned OpNo,
                                      raw_ostream &O) const {
  if (HexagonMCInstrInfo::getExtendableOp(MII, *MI) == OpNo &&
      (HasExtender || HexagonMCInstrInfo::isConstExtended(MII, *MI)))
    O << "#";
  MCOperand const &MO = MI->getOperand(OpNo);
  if (MO.isReg()) {
    O << getRegisterName(MO.getReg());
  } else if (MO.isExpr()) {
    int64_t Value;
    if (MO.getExpr()->evaluateAsAbsolute(Value))
      O << formatImm(Value);
    else
      O << *MO.getExpr();
  } else {
    llvm_unreachable("Unknown operand");
  }
}

void HexagonInstPrinter::printBrtarget(MCInst const *MI, unsigned OpNo,
                                       raw_ostream &O) const {
  MCOperand const &MO = MI->getOperand(OpNo);
  assert (MO.isExpr());
  MCExpr const &Expr = *MO.getExpr();
  int64_t Value;
  if (Expr.evaluateAsAbsolute(Value))
    O << format("0x%" PRIx64, Value);
  else {
    if (HasExtender || HexagonMCInstrInfo::isConstExtended(MII, *MI))
      if (HexagonMCInstrInfo::getExtendableOp(MII, *MI) == OpNo)
        O << "##";
    O << Expr;
  }
}