lib/Target/Hexagon/HexagonMCInstLower.cpp

   1 //===- HexagonMCInstLower.cpp - Convert Hexagon MachineInstr to an MCInst -===//
   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 file contains code to lower Hexagon MachineInstrs to their corresponding
  10 // MCInst records.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "Hexagon.h"
  15 #include "HexagonAsmPrinter.h"
  16 #include "MCTargetDesc/HexagonMCExpr.h"
  17 #include "MCTargetDesc/HexagonMCInstrInfo.h"
  18 #include "MCTargetDesc/HexagonMCTargetDesc.h"
  19 #include "llvm/ADT/APFloat.h"
  20 #include "llvm/ADT/APInt.h"
  21 #include "llvm/CodeGen/MachineBasicBlock.h"
  22 #include "llvm/CodeGen/MachineInstr.h"
  23 #include "llvm/CodeGen/MachineOperand.h"
  24 #include "llvm/IR/Constants.h"
  25 #include "llvm/MC/MCContext.h"
  26 #include "llvm/MC/MCExpr.h"
  27 #include "llvm/MC/MCInst.h"
  28 #include "llvm/Support/ErrorHandling.h"
  29 #include "llvm/Support/raw_ostream.h"
  30 #include <cassert>
  31
  32 using namespace llvm;
  33
  34 namespace llvm {
  35
  36 void HexagonLowerToMC(const MCInstrInfo &MCII, const MachineInstr *MI,
  37                       MCInst &MCB, HexagonAsmPrinter &AP);
  38
  39 } // end namespace llvm
  40
  41 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
  42                               HexagonAsmPrinter &Printer, bool MustExtend) {
  43   MCContext &MC = Printer.OutContext;
  44   const MCExpr *ME;
  45
  46   // Populate the relocation type based on Hexagon target flags
  47   // set on an operand
  48   MCSymbolRefExpr::VariantKind RelocationType;
  49   switch (MO.getTargetFlags() & ~HexagonII::HMOTF_ConstExtended) {
  50   default:
  51     RelocationType = MCSymbolRefExpr::VK_None;
  52     break;
  53   case HexagonII::MO_PCREL:
  54     RelocationType = MCSymbolRefExpr::VK_Hexagon_PCREL;
  55     break;
  56   case HexagonII::MO_GOT:
  57     RelocationType = MCSymbolRefExpr::VK_GOT;
  58     break;
  59   case HexagonII::MO_LO16:
  60     RelocationType = MCSymbolRefExpr::VK_Hexagon_LO16;
  61     break;
  62   case HexagonII::MO_HI16:
  63     RelocationType = MCSymbolRefExpr::VK_Hexagon_HI16;
  64     break;
  65   case HexagonII::MO_GPREL:
  66     RelocationType = MCSymbolRefExpr::VK_Hexagon_GPREL;
  67     break;
  68   case HexagonII::MO_GDGOT:
  69     RelocationType = MCSymbolRefExpr::VK_Hexagon_GD_GOT;
  70     break;
  71   case HexagonII::MO_GDPLT:
  72     RelocationType = MCSymbolRefExpr::VK_Hexagon_GD_PLT;
  73     break;
  74   case HexagonII::MO_IE:
  75     RelocationType = MCSymbolRefExpr::VK_Hexagon_IE;
  76     break;
  77   case HexagonII::MO_IEGOT:
  78     RelocationType = MCSymbolRefExpr::VK_Hexagon_IE_GOT;
  79     break;
  80   case HexagonII::MO_TPREL:
  81     RelocationType = MCSymbolRefExpr::VK_TPREL;
  82     break;
  83   }
  84
  85   ME = MCSymbolRefExpr::create(Symbol, RelocationType, MC);
  86
  87   if (!MO.isJTI() && MO.getOffset())
  88     ME = MCBinaryExpr::createAdd(ME, MCConstantExpr::create(MO.getOffset(), MC),
  89                                  MC);
  90
  91   ME = HexagonMCExpr::create(ME, MC);
  92   HexagonMCInstrInfo::setMustExtend(*ME, MustExtend);
  93   return MCOperand::createExpr(ME);
  94 }
  95
  96 // Create an MCInst from a MachineInstr
  97 void llvm::HexagonLowerToMC(const MCInstrInfo &MCII, const MachineInstr *MI,
  98                             MCInst &MCB, HexagonAsmPrinter &AP) {
  99   if (MI->getOpcode() == Hexagon::ENDLOOP0) {
 100     HexagonMCInstrInfo::setInnerLoop(MCB);
 101     return;
 102   }
 103   if (MI->getOpcode() == Hexagon::ENDLOOP1) {
 104     HexagonMCInstrInfo::setOuterLoop(MCB);
 105     return;
 106   }
 107   MCInst *MCI = new (AP.OutContext) MCInst;
 108   MCI->setOpcode(MI->getOpcode());
 109   assert(MCI->getOpcode() == static_cast<unsigned>(MI->getOpcode()) &&
 110          "MCI opcode should have been set on construction");
 111
 112   for (unsigned i = 0, e = MI->getNumOperands(); i < e; i++) {
 113     const MachineOperand &MO = MI->getOperand(i);
 114     MCOperand MCO;
 115     bool MustExtend = MO.getTargetFlags() & HexagonII::HMOTF_ConstExtended;
 116
 117     switch (MO.getType()) {
 118     default:
 119       MI->print(errs());
 120       llvm_unreachable("unknown operand type");
 121     case MachineOperand::MO_RegisterMask:
 122       continue;
 123     case MachineOperand::MO_Register:
 124       // Ignore all implicit register operands.
 125       if (MO.isImplicit())
 126         continue;
 127       MCO = MCOperand::createReg(MO.getReg());
 128       break;
 129     case MachineOperand::MO_FPImmediate: {
 130       APFloat Val = MO.getFPImm()->getValueAPF();
 131       // FP immediates are used only when setting GPRs, so they may be dealt
 132       // with like regular immediates from this point on.
 133       auto Expr = HexagonMCExpr::create(
 134           MCConstantExpr::create(*Val.bitcastToAPInt().getRawData(),
 135                                  AP.OutContext),
 136           AP.OutContext);
 137       HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
 138       MCO = MCOperand::createExpr(Expr);
 139       break;
 140     }
 141     case MachineOperand::MO_Immediate: {
 142       auto Expr = HexagonMCExpr::create(
 143           MCConstantExpr::create(MO.getImm(), AP.OutContext), AP.OutContext);
 144       HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
 145       MCO = MCOperand::createExpr(Expr);
 146       break;
 147     }
 148     case MachineOperand::MO_MachineBasicBlock: {
 149       MCExpr const *Expr = MCSymbolRefExpr::create(MO.getMBB()->getSymbol(),
 150                                                    AP.OutContext);
 151       Expr = HexagonMCExpr::create(Expr, AP.OutContext);
 152       HexagonMCInstrInfo::setMustExtend(*Expr, MustExtend);
 153       MCO = MCOperand::createExpr(Expr);
 154       break;
 155     }
 156     case MachineOperand::MO_GlobalAddress:
 157       MCO = GetSymbolRef(MO, AP.getSymbol(MO.getGlobal()), AP, MustExtend);
 158       break;
 159     case MachineOperand::MO_ExternalSymbol:
 160       MCO = GetSymbolRef(MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()),
 161                          AP, MustExtend);
 162       break;
 163     case MachineOperand::MO_JumpTableIndex:
 164       MCO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP, MustExtend);
 165       break;
 166     case MachineOperand::MO_ConstantPoolIndex:
 167       MCO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP, MustExtend);
 168       break;
 169     case MachineOperand::MO_BlockAddress:
 170       MCO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()), AP,
 171                          MustExtend);
 172       break;
 173     }
 174
 175     MCI->addOperand(MCO);
 176   }
 177   AP.HexagonProcessInstruction(*MCI, *MI);
 178   HexagonMCInstrInfo::extendIfNeeded(AP.OutContext, MCII, MCB, *MCI);
 179   MCB.addOperand(MCOperand::createInst(MCI));
 180 }