-bool TargetInstrInfoImpl::isDeadInstruction(const MachineInstr *MI) const {
- const TargetInstrDesc &TID = MI->getDesc();
- if (TID.mayLoad() || TID.mayStore() || TID.isCall() || TID.isTerminator() ||
- TID.isCall() || TID.isBarrier() || TID.isReturn() ||
- TID.hasUnmodeledSideEffects())
- return false;
- for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
- const MachineOperand &MO = MI->getOperand(i);
- if (!MO.isReg() || !MO.getReg())
- continue;
- if (MO.isDef() && !MO.isDead())
- return false;
- if (MO.isUse() && MO.isKill())
- // FIXME: We can't remove kill markers or else the scavenger will assert.
- // An alternative is to add a ADD pseudo instruction to replace kill
- // markers.
- return false;
- }
- return true;
+bool TargetInstrInfoImpl::produceSameValue(const MachineInstr *MI0,
+ const MachineInstr *MI1) const {
+ return MI0->isIdenticalTo(MI1, MachineInstr::IgnoreVRegDefs);
+}
+
+MachineInstr *TargetInstrInfoImpl::duplicate(MachineInstr *Orig,
+ MachineFunction &MF) const {
+ assert(!Orig->getDesc().isNotDuplicable() &&
+ "Instruction cannot be duplicated");
+ return MF.CloneMachineInstr(Orig);