266     MachineInstr *SaveExecInst = nullptr;  in runOnMachineFunction()  local
272       if (SaveExecInst && J->readsRegister(AMDGPU::EXEC, TRI)) {  in runOnMachineFunction()
276         SaveExecInst = nullptr;  in runOnMachineFunction()
283         if (SaveExecInst) {  in runOnMachineFunction()
286           SaveExecInst = nullptr;  in runOnMachineFunction()
295           SaveExecInst = &*J;  in runOnMachineFunction()
296           LLVM_DEBUG(dbgs() << "Found save exec op: " << *SaveExecInst << '\n');  in runOnMachineFunction()
303       } else if (ReadsCopyFromExec && !SaveExecInst) {  in runOnMachineFunction()
317       if (SaveExecInst && J->readsRegister(CopyToExec, TRI)) {  in runOnMachineFunction()
318         assert(SaveExecInst != &*J);  in runOnMachineFunction()
323     if (!SaveExecInst)  in runOnMachineFunction()
326     LLVM_DEBUG(dbgs() << "Insert save exec op: " << *SaveExecInst << '\n');  in runOnMachineFunction()
328     MachineOperand &Src0 = SaveExecInst->getOperand(1);  in runOnMachineFunction()
329     MachineOperand &Src1 = SaveExecInst->getOperand(2);  in runOnMachineFunction()
336       if (!SaveExecInst->isCommutable())  in runOnMachineFunction()
345     auto InsPt = SaveExecInst->getIterator();  in runOnMachineFunction()
346     const DebugLoc &DL = SaveExecInst->getDebugLoc();  in runOnMachineFunction()
348     BuildMI(MBB, InsPt, DL, TII->get(getSaveExecOp(SaveExecInst->getOpcode())),  in runOnMachineFunction()
351     SaveExecInst->eraseFromParent();  in runOnMachineFunction()