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()) {
35 default: llvm_unreachable("Unknown target flag on GV operand");
39 return Printer.Mang->getSymbol(MO.getGlobal());
42 MCSymbol *MBlazeMCInstLower::
43 GetExternalSymbolSymbol(const MachineOperand &MO) const {
44 switch (MO.getTargetFlags()) {
45 default: llvm_unreachable("Unknown target flag on GV operand");
49 return Printer.GetExternalSymbolSymbol(MO.getSymbolName());
52 MCSymbol *MBlazeMCInstLower::
53 GetJumpTableSymbol(const MachineOperand &MO) const {
54 SmallString<256> Name;
55 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "JTI"
56 << Printer.getFunctionNumber() << '_'
58 switch (MO.getTargetFlags()) {
59 default: llvm_unreachable("Unknown target flag on GV operand");
63 // Create a symbol for the name.
64 return Ctx.GetOrCreateSymbol(Name.str());
67 MCSymbol *MBlazeMCInstLower::
68 GetConstantPoolIndexSymbol(const MachineOperand &MO) const {
69 SmallString<256> Name;
70 raw_svector_ostream(Name) << Printer.MAI->getPrivateGlobalPrefix() << "CPI"
71 << Printer.getFunctionNumber() << '_'
74 switch (MO.getTargetFlags()) {
76 llvm_unreachable("Unknown target flag on GV operand");
81 // Create a symbol for the name.
82 return Ctx.GetOrCreateSymbol(Name.str());
85 MCSymbol *MBlazeMCInstLower::
86 GetBlockAddressSymbol(const MachineOperand &MO) const {
87 switch (MO.getTargetFlags()) {
88 default: llvm_unreachable("Unknown target flag on GV operand");
92 return Printer.GetBlockAddressSymbol(MO.getBlockAddress());
95 MCOperand MBlazeMCInstLower::
96 LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const {
97 // FIXME: We would like an efficient form for this, so we don't have to do a
98 // lot of extra uniquing.
99 const MCExpr *Expr = MCSymbolRefExpr::Create(Sym, Ctx);
101 switch (MO.getTargetFlags()) {
103 llvm_unreachable("Unknown target flag on GV operand");
108 if (!MO.isJTI() && MO.getOffset())
109 Expr = MCBinaryExpr::CreateAdd(Expr,
110 MCConstantExpr::Create(MO.getOffset(), Ctx),
112 return MCOperand::CreateExpr(Expr);
115 void MBlazeMCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
116 OutMI.setOpcode(MI->getOpcode());
118 for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
119 const MachineOperand &MO = MI->getOperand(i);
122 switch (MO.getType()) {
123 default: llvm_unreachable("unknown operand type");
124 case MachineOperand::MO_Register:
125 // Ignore all implicit register operands.
126 if (MO.isImplicit()) continue;
127 MCOp = MCOperand::CreateReg(MO.getReg());
129 case MachineOperand::MO_Immediate:
130 MCOp = MCOperand::CreateImm(MO.getImm());
132 case MachineOperand::MO_MachineBasicBlock:
133 MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
134 MO.getMBB()->getSymbol(), Ctx));
136 case MachineOperand::MO_GlobalAddress:
137 MCOp = LowerSymbolOperand(MO, GetGlobalAddressSymbol(MO));
139 case MachineOperand::MO_ExternalSymbol:
140 MCOp = LowerSymbolOperand(MO, GetExternalSymbolSymbol(MO));
142 case MachineOperand::MO_JumpTableIndex:
143 MCOp = LowerSymbolOperand(MO, GetJumpTableSymbol(MO));
145 case MachineOperand::MO_ConstantPoolIndex:
146 MCOp = LowerSymbolOperand(MO, GetConstantPoolIndexSymbol(MO));
148 case MachineOperand::MO_BlockAddress:
149 MCOp = LowerSymbolOperand(MO, GetBlockAddressSymbol(MO));
151 case MachineOperand::MO_FPImmediate: {
153 APFloat FVal = MO.getFPImm()->getValueAPF();
154 FVal.convert(APFloat::IEEEsingle, APFloat::rmTowardZero, &ignored);
156 APInt IVal = FVal.bitcastToAPInt();
157 uint64_t Val = *IVal.getRawData();
158 MCOp = MCOperand::CreateImm(Val);
161 case MachineOperand::MO_RegisterMask:
165 OutMI.addOperand(MCOp);