456     MachineInstr *SaveExecInst = nullptr;  in optimizeExecSequence()  local
463       if (SaveExecInst && J->readsRegister(Exec, TRI)) {  in optimizeExecSequence()
467         SaveExecInst = nullptr;  in optimizeExecSequence()
474         if (SaveExecInst) {  in optimizeExecSequence()
477           SaveExecInst = nullptr;  in optimizeExecSequence()
486           SaveExecInst = &*J;  in optimizeExecSequence()
487           LLVM_DEBUG(dbgs() << "Found save exec op: " << *SaveExecInst << '\n');  in optimizeExecSequence()
494       } else if (ReadsCopyFromExec && !SaveExecInst) {  in optimizeExecSequence()
508       if (SaveExecInst && J->readsRegister(CopyToExec, TRI)) {  in optimizeExecSequence()
509         assert(SaveExecInst != &*J);  in optimizeExecSequence()
514     if (!SaveExecInst)  in optimizeExecSequence()
517     LLVM_DEBUG(dbgs() << "Insert save exec op: " << *SaveExecInst << '\n');  in optimizeExecSequence()
519     MachineOperand &Src0 = SaveExecInst->getOperand(1);  in optimizeExecSequence()
520     MachineOperand &Src1 = SaveExecInst->getOperand(2);  in optimizeExecSequence()
527       if (!SaveExecInst->isCommutable())  in optimizeExecSequence()
536     auto InsPt = SaveExecInst->getIterator();  in optimizeExecSequence()
537     const DebugLoc &DL = SaveExecInst->getDebugLoc();  in optimizeExecSequence()
539     BuildMI(MBB, InsPt, DL, TII->get(getSaveExecOp(SaveExecInst->getOpcode())),  in optimizeExecSequence()
542     SaveExecInst->eraseFromParent();  in optimizeExecSequence()