1 //===-- MBLazeMCInstLower.cpp - Convert MBlaze 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 MBlaze MachineInstrs to their corresponding
13 //===----------------------------------------------------------------------===//
15 #include "MBlazeMCInstLower.h"
16 #include "MBlazeInstrInfo.h"
17 #include "llvm/Constants.h"
18 #include "llvm/CodeGen/AsmPrinter.h"
19 #include "llvm/CodeGen/MachineBasicBlock.h"
20 #include "llvm/CodeGen/MachineInstr.h"
21 #include "llvm/MC/MCAsmInfo.h"
22 #include "llvm/MC/MCContext.h"
23 #include "llvm/MC/MCExpr.h"
24 #include "llvm/MC/MCInst.h"
25 #include "llvm/Target/Mangler.h"
26 #include "llvm/Support/Debug.h"
27 #include "llvm/Support/raw_ostream.h"
28 #include "llvm/Support/ErrorHandling.h"
29 #include "llvm/ADT/SmallString.h"
32 MCSymbol *MBlazeMCInstLower::
33 GetGlobalAddressSymbol(const MachineOperand &MO) const {
34 switch (MO.getTargetFlags()) {
36 llvm_unreachable("Unknown target flag on GV operand");
41 return Printer.Mang->getSymbol(MO.getGlobal());
44 MCSymbol *MBlazeMCInstLower::
45 GetExternalSymbolSymbol(const MachineOperand &MO) const {
46 switch (MO.getTargetFlags()) {
48 assert(0 && "Unknown target flag on GV operand");
53 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
56 MCSymbol *MBlazeMCInstLower::
57 GetJumpTableSymbol(const MachineOperand &MO) const {
58 SmallString<256> Name;
59 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
60 << Printer.getFunctionNumber() << '_'
63 switch (MO.getTargetFlags()) {
65 llvm_unreachable("Unknown target flag on GV operand");
70 // Create a symbol for the name.
71 return Ctx.GetOrCreateSymbol(Name.str());
74 MCSymbol *MBlazeMCInstLower::
75 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
76 SmallString<256> Name;
77 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
78 << Printer.getFunctionNumber() << '_'
81 switch (MO.getTargetFlags()) {
83 llvm_unreachable("Unknown target flag on GV operand");
88 // Create a symbol for the name.
89 return Ctx.GetOrCreateSymbol(Name.str());
92 MCSymbol *MBlazeMCInstLower::
93 GetBlockAddressSymbol(const MachineOperand &MO) const {
94 switch (MO.getTargetFlags()) {
96 assert(0 && "Unknown target flag on GV operand");
101 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
104 MCOperand MBlazeMCInstLower::
105 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
106 // FIXME: We would like an efficient form for this, so we don't have to do a
107 // lot of extra uniquing.
108 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
110 switch (MO.getTargetFlags()) {
112 llvm_unreachable("Unknown target flag on GV operand");
117 if (!MO.isJTI() && MO.getOffset())
118 Expr = MCBinaryExpr::CreateAdd(Expr,
119 MCConstantExpr::Create(MO.getOffset(), Ctx),
121 return MCOperand::CreateExpr(Expr);
124 void MBlazeMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
125 OutMI.setOpcode(MI->getOpcode());
127 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
128 const MachineOperand &MO = MI->getOperand(i);
131 switch (MO.getType()) {
133 assert(0 && "unknown operand type");
134 case MachineOperand::MO_Register:
135 // Ignore all implicit register operands.
136 if (MO.isImplicit()) continue;
137 MCOp = MCOperand::CreateReg(MO.getReg());
139 case MachineOperand::MO_Immediate:
140 MCOp = MCOperand::CreateImm(MO.getImm());
142 case MachineOperand::MO_MachineBasicBlock:
143 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
144 MO.getMBB()->getSymbol(), Ctx));
146 case MachineOperand::MO_GlobalAddress:
147 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
149 case MachineOperand::MO_ExternalSymbol:
150 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
152 case MachineOperand::MO_JumpTableIndex:
153 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
155 case MachineOperand::MO_ConstantPoolIndex:
156 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
158 case MachineOperand::MO_BlockAddress:
159 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
161 case MachineOperand::MO_FPImmediate:
163 APFloat FVal = MO.getFPImm()->getValueAPF();
164 FVal.convert(APFloat::IEEEsingle, APFloat::rmTowardZero, &ignored);
166 APInt IVal = FVal.bitcastToAPInt();
167 uint64_t Val = *IVal.getRawData();
168 MCOp = MCOperand::CreateImm(Val);
172 OutMI.addOperand(MCOp);