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//===- HexagonMCInstLower.cpp - Convert Hexagon MachineInstr to an MCInst -===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains code to lower Hexagon MachineInstrs to their corresponding
// MCInst records.
//
//===----------------------------------------------------------------------===//
#include "Hexagon.h"
#include "HexagonAsmPrinter.h"
#include "HexagonMachineFunctionInfo.h"
#include "MCTargetDesc/HexagonMCInst.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/IR/Constants.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/Target/Mangler.h"
using namespace llvm;
static MCOperand GetSymbolRef(const MachineOperand& MO, const MCSymbol* Symbol,
HexagonAsmPrinter& Printer) {
MCContext &MC = Printer.OutContext;
const MCExpr *ME;
ME = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, MC);
if (!MO.isJTI() && MO.getOffset())
ME = MCBinaryExpr::CreateAdd(ME, MCConstantExpr::Create(MO.getOffset(), MC),
MC);
return (MCOperand::CreateExpr(ME));
}
// Create an MCInst from a MachineInstr
void llvm::HexagonLowerToMC(const MachineInstr* MI, HexagonMCInst& MCI,
HexagonAsmPrinter& AP) {
MCI.setOpcode(MI->getOpcode());
MCI.setDesc(MI->getDesc());
for (unsigned i = 0, e = MI->getNumOperands(); i < e; i++) {
const MachineOperand &MO = MI->getOperand(i);
MCOperand MCO;
switch (MO.getType()) {
default:
MI->dump();
llvm_unreachable("unknown operand type");
case MachineOperand::MO_Register:
// Ignore all implicit register operands.
if (MO.isImplicit()) continue;
MCO = MCOperand::CreateReg(MO.getReg());
break;
case MachineOperand::MO_FPImmediate: {
APFloat Val = MO.getFPImm()->getValueAPF();
// FP immediates are used only when setting GPRs, so they may be dealt
// with like regular immediates from this point on.
MCO = MCOperand::CreateImm(*Val.bitcastToAPInt().getRawData());
break;
}
case MachineOperand::MO_Immediate:
MCO = MCOperand::CreateImm(MO.getImm());
break;
case MachineOperand::MO_MachineBasicBlock:
MCO = MCOperand::CreateExpr
(MCSymbolRefExpr::Create(MO.getMBB()->getSymbol(),
AP.OutContext));
break;
case MachineOperand::MO_GlobalAddress:
MCO = GetSymbolRef(MO, AP.Mang->getSymbol(MO.getGlobal()), AP);
break;
case MachineOperand::MO_ExternalSymbol:
MCO = GetSymbolRef(MO, AP.GetExternalSymbolSymbol(MO.getSymbolName()),
AP);
break;
case MachineOperand::MO_JumpTableIndex:
MCO = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
break;
case MachineOperand::MO_ConstantPoolIndex:
MCO = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
break;
case MachineOperand::MO_BlockAddress:
MCO = GetSymbolRef(MO, AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP);
break;
}
MCI.addOperand(MCO);
}
}
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