+MCOperand MipsMCInstLower::createSub(MachineBasicBlock *BB1,
+ MachineBasicBlock *BB2,
+ MCSymbolRefExpr::VariantKind Kind) const {
+ const MCSymbolRefExpr *Sym1 = MCSymbolRefExpr::Create(BB1->getSymbol(), *Ctx);
+ const MCSymbolRefExpr *Sym2 = MCSymbolRefExpr::Create(BB2->getSymbol(), *Ctx);
+ const MCBinaryExpr *Sub = MCBinaryExpr::CreateSub(Sym1, Sym2, *Ctx);
+
+ return MCOperand::createExpr(MipsMCExpr::Create(Kind, Sub, *Ctx));
+}
+
+void MipsMCInstLower::
+lowerLongBranchLUi(const MachineInstr *MI, MCInst &OutMI) const {
+ OutMI.setOpcode(Mips::LUi);
+
+ // Lower register operand.
+ OutMI.addOperand(LowerOperand(MI->getOperand(0)));
+
+ // Create %hi($tgt-$baltgt).
+ OutMI.addOperand(createSub(MI->getOperand(1).getMBB(),
+ MI->getOperand(2).getMBB(),
+ MCSymbolRefExpr::VK_Mips_ABS_HI));
+}
+
+void MipsMCInstLower::
+lowerLongBranchADDiu(const MachineInstr *MI, MCInst &OutMI, int Opcode,
+ MCSymbolRefExpr::VariantKind Kind) const {
+ OutMI.setOpcode(Opcode);
+
+ // Lower two register operands.
+ for (unsigned I = 0, E = 2; I != E; ++I) {
+ const MachineOperand &MO = MI->getOperand(I);
+ OutMI.addOperand(LowerOperand(MO));
+ }
+
+ // Create %lo($tgt-$baltgt) or %hi($tgt-$baltgt).
+ OutMI.addOperand(createSub(MI->getOperand(2).getMBB(),
+ MI->getOperand(3).getMBB(), Kind));
+}
+
+bool MipsMCInstLower::lowerLongBranch(const MachineInstr *MI,
+ MCInst &OutMI) const {
+ switch (MI->getOpcode()) {
+ default:
+ return false;
+ case Mips::LONG_BRANCH_LUi:
+ lowerLongBranchLUi(MI, OutMI);
+ return true;
+ case Mips::LONG_BRANCH_ADDiu:
+ lowerLongBranchADDiu(MI, OutMI, Mips::ADDiu,
+ MCSymbolRefExpr::VK_Mips_ABS_LO);
+ return true;
+ case Mips::LONG_BRANCH_DADDiu:
+ unsigned TargetFlags = MI->getOperand(2).getTargetFlags();
+ if (TargetFlags == MipsII::MO_ABS_HI)
+ lowerLongBranchADDiu(MI, OutMI, Mips::DADDiu,
+ MCSymbolRefExpr::VK_Mips_ABS_HI);
+ else if (TargetFlags == MipsII::MO_ABS_LO)
+ lowerLongBranchADDiu(MI, OutMI, Mips::DADDiu,
+ MCSymbolRefExpr::VK_Mips_ABS_LO);
+ else
+ report_fatal_error("Unexpected flags for LONG_BRANCH_DADDiu");
+ return true;
+ }
+}
+