- // All operands from OpNo have been removed from RegInfo. If the Operands
- // backing store needs to be reallocated, we also need to remove any other
- // register operands.
- if (Reallocate)
- for (unsigned i = 0; i != OpNo; ++i)
- if (Operands[i].isReg())
- RegInfo->removeRegOperandFromUseList(&Operands[i]);
-
- // Insert the new operand at OpNo.
- Operands.insert(Operands.begin() + OpNo, Op);
- Operands[OpNo].ParentMI = this;
-
- // The Operands backing store has now been reallocated, so we can re-add the
- // operands before OpNo.
- if (Reallocate)
- for (unsigned i = 0; i != OpNo; ++i)
- if (Operands[i].isReg())
- RegInfo->addRegOperandToUseList(&Operands[i]);
-
- // When adding a register operand, tell RegInfo about it.
- if (Operands[OpNo].isReg()) {
+ MachineRegisterInfo *MRI = getRegInfo();
+
+ // Determine if the Operands array needs to be reallocated.
+ // Save the old capacity and operand array.
+ OperandCapacity OldCap = CapOperands;
+ MachineOperand *OldOperands = Operands;
+ if (!OldOperands || OldCap.getSize() == getNumOperands()) {
+ CapOperands = OldOperands ? OldCap.getNext() : OldCap.get(1);
+ Operands = MF.allocateOperandArray(CapOperands);
+ // Move the operands before the insertion point.
+ if (OpNo)
+ moveOperands(Operands, OldOperands, OpNo, MRI);
+ }
+
+ // Move the operands following the insertion point.
+ if (OpNo != NumOperands)
+ moveOperands(Operands + OpNo + 1, OldOperands + OpNo, NumOperands - OpNo,
+ MRI);
+ ++NumOperands;
+
+ // Deallocate the old operand array.
+ if (OldOperands != Operands && OldOperands)
+ MF.deallocateOperandArray(OldCap, OldOperands);
+
+ // Copy Op into place. It still needs to be inserted into the MRI use lists.
+ MachineOperand *NewMO = new (Operands + OpNo) MachineOperand(Op);
+ NewMO->ParentMI = this;
+
+ // When adding a register operand, tell MRI about it.
+ if (NewMO->isReg()) {