--- a/llvm/lib/Target/Hexagon/RDFDeadCode.cpp	Wed Nov 09 17:47:54 2022 +0900
+++ b/llvm/lib/Target/Hexagon/RDFDeadCode.cpp	Fri Aug 18 09:04:13 2023 +0900
@@ -55,7 +55,8 @@
 // overly conservative (i.e. return "true" for all instructions), but it
 // is not safe to return "false" for an instruction that should not be
 // considered removable.
-bool DeadCodeElimination::isLiveInstr(const MachineInstr *MI) const {
+bool DeadCodeElimination::isLiveInstr(NodeAddr<StmtNode *> S) const {
+  const MachineInstr *MI = S.Addr->getCode();
   if (MI->mayStore() || MI->isBranch() || MI->isCall() || MI->isReturn())
     return true;
   if (MI->hasOrderedMemoryRef() || MI->hasUnmodeledSideEffects() ||
@@ -83,7 +84,7 @@
       SetQueue<NodeId> &WorkQ) {
   if (!DFG.IsCode<NodeAttrs::Stmt>(IA))
     return;
-  if (!isLiveInstr(NodeAddr<StmtNode*>(IA).Addr->getCode()))
+  if (!isLiveInstr(IA))
     return;
   for (NodeAddr<RefNode*> RA : IA.Addr->members(DFG)) {
     if (!LiveNodes.count(RA.Id))
@@ -160,7 +161,7 @@
         if (!LiveNodes.count(RA.Id))
           DeadNodes.insert(RA.Id);
       if (DFG.IsCode<NodeAttrs::Stmt>(IA))
-        if (isLiveInstr(NodeAddr<StmtNode*>(IA).Addr->getCode()))
+        if (isLiveInstr(IA) || DFG.hasUntrackedRef(IA))
           continue;
       if (IsDead(IA)) {
         DeadInstrs.insert(IA.Id);