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/ARMMCExpr.h"
18 #include "llvm/CodeGen/MachineBasicBlock.h"
19 #include "llvm/IR/Constants.h"
20 #include "llvm/IR/Mangler.h"
21 #include "llvm/MC/MCExpr.h"
22 #include "llvm/MC/MCInst.h"
26 MCOperand ARMAsmPrinter::GetSymbolRef(const MachineOperand &MO,
27 const MCSymbol *Symbol) {
29 unsigned Option = MO.getTargetFlags() & ARMII::MO_OPTION_MASK;
32 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
35 default: llvm_unreachable("Unknown target flag on symbol operand");
39 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
41 Expr = ARMMCExpr::CreateLower16(Expr, OutContext);
44 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None,
46 Expr = ARMMCExpr::CreateUpper16(Expr, OutContext);
53 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_PLT,
58 if (!MO.isJTI() && MO.getOffset())
59 Expr = MCBinaryExpr::CreateAdd(Expr,
60 MCConstantExpr::Create(MO.getOffset(),
63 return MCOperand::CreateExpr(Expr);
67 bool ARMAsmPrinter::lowerOperand(const MachineOperand &MO,
69 switch (MO.getType()) {
70 default: llvm_unreachable("unknown operand type");
71 case MachineOperand::MO_Register:
72 // Ignore all non-CPSR implicit register operands.
73 if (MO.isImplicit() && MO.getReg() != ARM::CPSR)
75 assert(!MO.getSubReg() && "Subregs should be eliminated!");
76 MCOp = MCOperand::CreateReg(MO.getReg());
78 case MachineOperand::MO_Immediate:
79 MCOp = MCOperand::CreateImm(MO.getImm());
81 case MachineOperand::MO_MachineBasicBlock:
82 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
83 MO.getMBB()->getSymbol(), OutContext));
85 case MachineOperand::MO_GlobalAddress: {
86 MCOp = GetSymbolRef(MO,
87 GetARMGVSymbol(MO.getGlobal(), MO.getTargetFlags()));
90 case MachineOperand::MO_ExternalSymbol:
91 MCOp = GetSymbolRef(MO,
92 GetExternalSymbolSymbol(MO.getSymbolName()));
94 case MachineOperand::MO_JumpTableIndex:
95 MCOp = GetSymbolRef(MO, GetJTISymbol(MO.getIndex()));
97 case MachineOperand::MO_ConstantPoolIndex:
98 MCOp = GetSymbolRef(MO, GetCPISymbol(MO.getIndex()));
100 case MachineOperand::MO_BlockAddress:
101 MCOp = GetSymbolRef(MO, GetBlockAddressSymbol(MO.getBlockAddress()));
103 case MachineOperand::MO_FPImmediate: {
104 APFloat Val = MO.getFPImm()->getValueAPF();
106 Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
107 MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
110 case MachineOperand::MO_RegisterMask:
111 // Ignore call clobbers.
117 void llvm::LowerARMMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
119 OutMI.setOpcode(MI->getOpcode());
121 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
122 const MachineOperand &MO = MI->getOperand(i);
125 if (AP.lowerOperand(MO, MCOp))
126 OutMI.addOperand(MCOp);