lib/Target/Hexagon/MCTargetDesc/HexagonInstPrinter.cpp

   1 //===- HexagonInstPrinter.cpp - Convert Hexagon MCInst to assembly syntax -===//
   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 class prints an Hexagon MCInst to a .s file.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "HexagonInstPrinter.h"
  14 #include "MCTargetDesc/HexagonBaseInfo.h"
  15 #include "MCTargetDesc/HexagonMCInstrInfo.h"
  16 #include "llvm/MC/MCAsmInfo.h"
  17 #include "llvm/MC/MCExpr.h"
  18 #include "llvm/MC/MCInst.h"
  19 #include "llvm/Support/Debug.h"
  20 #include "llvm/Support/raw_ostream.h"
  21
  22 using namespace llvm;
  23
  24 #define DEBUG_TYPE "asm-printer"
  25
  26 #define GET_INSTRUCTION_NAME
  27 #include "HexagonGenAsmWriter.inc"
  28
  29 void HexagonInstPrinter::printRegName(raw_ostream &O, unsigned RegNo) const {
  30   O << getRegisterName(RegNo);
  31 }
  32
  33 void HexagonInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
  34                                    StringRef Annot, const MCSubtargetInfo &STI) {
  35   assert(HexagonMCInstrInfo::isBundle(*MI));
  36   assert(HexagonMCInstrInfo::bundleSize(*MI) <= HEXAGON_PACKET_SIZE);
  37   assert(HexagonMCInstrInfo::bundleSize(*MI) > 0);
  38   HasExtender = false;
  39   for (auto const &I : HexagonMCInstrInfo::bundleInstructions(*MI)) {
  40     MCInst const &MCI = *I.getInst();
  41     if (HexagonMCInstrInfo::isDuplex(MII, MCI)) {
  42       printInstruction(MCI.getOperand(1).getInst(), OS);
  43       OS << '\v';
  44       HasExtender = false;
  45       printInstruction(MCI.getOperand(0).getInst(), OS);
  46     } else
  47       printInstruction(&MCI, OS);
  48     HasExtender = HexagonMCInstrInfo::isImmext(MCI);
  49     OS << "\n";
  50   }
  51
  52   bool IsLoop0 = HexagonMCInstrInfo::isInnerLoop(*MI);
  53   bool IsLoop1 = HexagonMCInstrInfo::isOuterLoop(*MI);
  54   if (IsLoop0) {
  55     OS << (IsLoop1 ? " :endloop01" : " :endloop0");
  56   } else if (IsLoop1) {
  57     OS << " :endloop1";
  58   }
  59 }
  60
  61 void HexagonInstPrinter::printOperand(MCInst const *MI, unsigned OpNo,
  62                                       raw_ostream &O) const {
  63   if (HexagonMCInstrInfo::getExtendableOp(MII, *MI) == OpNo &&
  64       (HasExtender || HexagonMCInstrInfo::isConstExtended(MII, *MI)))
  65     O << "#";
  66   MCOperand const &MO = MI->getOperand(OpNo);
  67   if (MO.isReg()) {
  68     O << getRegisterName(MO.getReg());
  69   } else if (MO.isExpr()) {
  70     int64_t Value;
  71     if (MO.getExpr()->evaluateAsAbsolute(Value))
  72       O << formatImm(Value);
  73     else
  74       O << *MO.getExpr();
  75   } else {
  76     llvm_unreachable("Unknown operand");
  77   }
  78 }
  79
  80 void HexagonInstPrinter::printBrtarget(MCInst const *MI, unsigned OpNo,
  81                                        raw_ostream &O) const {
  82   MCOperand const &MO = MI->getOperand(OpNo);
  83   assert (MO.isExpr());
  84   MCExpr const &Expr = *MO.getExpr();
  85   int64_t Value;
  86   if (Expr.evaluateAsAbsolute(Value))
  87     O << format("0x%" PRIx64, Value);
  88   else {
  89     if (HasExtender || HexagonMCInstrInfo::isConstExtended(MII, *MI))
  90       if (HexagonMCInstrInfo::getExtendableOp(MII, *MI) == OpNo)
  91         O << "##";
  92     O << Expr;
  93   }
  94 }