1 //===-- ARMMCInstLower.cpp - Convert ARM MachineInstr to an MCInst --------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains code to lower ARM MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
16 #include "ARMAsmPrinter.h"
17 #include "MCTargetDesc/ARMBaseInfo.h"
18 #include "MCTargetDesc/ARMMCExpr.h"
19 #include "llvm/CodeGen/MachineBasicBlock.h"
20 #include "llvm/IR/Constants.h"
21 #include "llvm/IR/Mangler.h"
22 #include "llvm/MC/MCExpr.h"
23 #include "llvm/MC/MCInst.h"
27 MCOperand ARMAsmPrinter::GetSymbolRef(const MachineOperand &MO,
28 const MCSymbol *Symbol) {
30 unsigned Option = MO.getTargetFlags() & ARMII::MO_OPTION_MASK;
33 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
36 default: llvm_unreachable("Unknown target flag on symbol operand");
40 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
42 Expr = ARMMCExpr::CreateLower16(Expr, OutContext);
45 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
47 Expr = ARMMCExpr::CreateUpper16(Expr, OutContext);
54 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_PLT,
59 if (!MO.isJTI() && MO.getOffset())
60 Expr = MCBinaryExpr::CreateAdd(Expr,
61 MCConstantExpr::Create(MO.getOffset(),
64 return MCOperand::CreateExpr(Expr);
68 bool ARMAsmPrinter::lowerOperand(const MachineOperand &MO,
70 switch (MO.getType()) {
71 default: llvm_unreachable("unknown operand type");
72 case MachineOperand::MO_Register:
73 // Ignore all non-CPSR implicit register operands.
74 if (MO.isImplicit() && MO.getReg() != ARM::CPSR)
76 assert(!MO.getSubReg() && "Subregs should be eliminated!");
77 MCOp = MCOperand::CreateReg(MO.getReg());
79 case MachineOperand::MO_Immediate:
80 MCOp = MCOperand::CreateImm(MO.getImm());
82 case MachineOperand::MO_MachineBasicBlock:
83 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
84 MO.getMBB()->getSymbol(), OutContext));
86 case MachineOperand::MO_GlobalAddress: {
87 MCOp = GetSymbolRef(MO,
88 GetARMGVSymbol(MO.getGlobal(), MO.getTargetFlags()));
91 case MachineOperand::MO_ExternalSymbol:
92 MCOp = GetSymbolRef(MO,
93 GetExternalSymbolSymbol(MO.getSymbolName()));
95 case MachineOperand::MO_JumpTableIndex:
96 MCOp = GetSymbolRef(MO, GetJTISymbol(MO.getIndex()));
98 case MachineOperand::MO_ConstantPoolIndex:
99 MCOp = GetSymbolRef(MO, GetCPISymbol(MO.getIndex()));
101 case MachineOperand::MO_BlockAddress:
102 MCOp = GetSymbolRef(MO, GetBlockAddressSymbol(MO.getBlockAddress()));
104 case MachineOperand::MO_FPImmediate: {
105 APFloat Val = MO.getFPImm()->getValueAPF();
107 Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
108 MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
111 case MachineOperand::MO_RegisterMask:
112 // Ignore call clobbers.
118 void llvm::LowerARMMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
120 OutMI.setOpcode(MI->getOpcode());
122 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
123 const MachineOperand &MO = MI->getOperand(i);
126 if (AP.lowerOperand(MO, MCOp))
127 OutMI.addOperand(MCOp);