- MachineInstr *MI = Indexes->getInstructionFromIndex(Def);
- assert(MI && "No instruction to erase");
- if (MI->isCopy()) {
- unsigned Reg = MI->getOperand(1).getReg();
- if (TargetRegisterInfo::isVirtualRegister(Reg) &&
- Reg != CP.getSrcReg() && Reg != CP.getDstReg())
- ShrinkRegs.push_back(Reg);
+ switch (Vals[i].Resolution) {
+ case CR_Keep:
+ // If an IMPLICIT_DEF value is pruned, it doesn't serve a purpose any
+ // longer. The IMPLICIT_DEF instructions are only inserted by
+ // PHIElimination to guarantee that all PHI predecessors have a value.
+ if (!Vals[i].IsImplicitDef || !Vals[i].Pruned)
+ break;
+ // Remove value number i from LI. Note that this VNInfo is still present
+ // in NewVNInfo, so it will appear as an unused value number in the final
+ // joined interval.
+ LI.getValNumInfo(i)->markUnused();
+ LI.removeValNo(LI.getValNumInfo(i));
+ DEBUG(dbgs() << "\t\tremoved " << i << '@' << Def << ": " << LI << '\n');
+ // FALL THROUGH.
+
+ case CR_Erase: {
+ MachineInstr *MI = Indexes->getInstructionFromIndex(Def);
+ assert(MI && "No instruction to erase");
+ if (MI->isCopy()) {
+ unsigned Reg = MI->getOperand(1).getReg();
+ if (TargetRegisterInfo::isVirtualRegister(Reg) &&
+ Reg != CP.getSrcReg() && Reg != CP.getDstReg())
+ ShrinkRegs.push_back(Reg);
+ }
+ ErasedInstrs.insert(MI);
+ DEBUG(dbgs() << "\t\terased:\t" << Def << '\t' << *MI);
+ LIS->RemoveMachineInstrFromMaps(MI);
+ MI->eraseFromParent();
+ break;
+ }
+ default:
+ break;