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 "llvm/Constants.h"
18 #include "llvm/CodeGen/MachineBasicBlock.h"
19 #include "llvm/MC/MCExpr.h"
20 #include "llvm/MC/MCInst.h"
21 #include "llvm/Target/Mangler.h"
25 static MCOperand GetSymbolRef(const MachineOperand &MO, const MCSymbol *Symbol,
26 ARMAsmPrinter &Printer) {
27 MCContext &Ctx = Printer.OutContext;
29 switch (MO.getTargetFlags()) {
30 default: assert(0 && "Unknown target flag on symbol operand");
32 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_None, Ctx);
35 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_LO16, Ctx);
38 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_HI16, Ctx);
41 Expr = MCSymbolRefExpr::Create(Symbol, MCSymbolRefExpr::VK_ARM_PLT, Ctx);
45 if (!MO.isJTI() && MO.getOffset())
46 Expr = MCBinaryExpr::CreateAdd(Expr,
47 MCConstantExpr::Create(MO.getOffset(), Ctx),
49 return MCOperand::CreateExpr(Expr);
53 void llvm::LowerARMMachineInstrToMCInst(const MachineInstr *MI, MCInst &OutMI,
55 OutMI.setOpcode(MI->getOpcode());
57 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
58 const MachineOperand &MO = MI->getOperand(i);
61 switch (MO.getType()) {
64 assert(0 && "unknown operand type");
65 case MachineOperand::MO_Register:
66 // Ignore all non-CPSR implicit register operands.
67 if (MO.isImplicit() && MO.getReg() != ARM::CPSR) continue;
68 assert(!MO.getSubReg() && "Subregs should be eliminated!");
69 MCOp = MCOperand::CreateReg(MO.getReg());
71 case MachineOperand::MO_Immediate:
72 MCOp = MCOperand::CreateImm(MO.getImm());
74 case MachineOperand::MO_MachineBasicBlock:
75 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
76 MO.getMBB()->getSymbol(), AP.OutContext));
78 case MachineOperand::MO_GlobalAddress:
79 MCOp = GetSymbolRef(MO, AP.Mang->getSymbol(MO.getGlobal()), AP);
81 case MachineOperand::MO_ExternalSymbol:
82 MCOp = GetSymbolRef(MO,
83 AP.GetExternalSymbolSymbol(MO.getSymbolName()), AP);
85 case MachineOperand::MO_JumpTableIndex:
86 MCOp = GetSymbolRef(MO, AP.GetJTISymbol(MO.getIndex()), AP);
88 case MachineOperand::MO_ConstantPoolIndex:
89 MCOp = GetSymbolRef(MO, AP.GetCPISymbol(MO.getIndex()), AP);
91 case MachineOperand::MO_BlockAddress:
92 MCOp = GetSymbolRef(MO,AP.GetBlockAddressSymbol(MO.getBlockAddress()),AP);
94 case MachineOperand::MO_FPImmediate:
95 APFloat Val = MO.getFPImm()->getValueAPF();
97 Val.convert(APFloat::IEEEdouble, APFloat::rmTowardZero, &ignored);
98 MCOp = MCOperand::CreateFPImm(Val.convertToDouble());
102 OutMI.addOperand(MCOp);