1 files changed, 10 insertions, 1 deletions
diff --git a/llvm/lib/Target/Hexagon/HexagonOptAddrMode.cpp b/llvm/lib/Target/Hexagon/HexagonOptAddrMode.cpp
index 49d5cb34a0d..be50288849c 100644
--- a/llvm/lib/Target/Hexagon/HexagonOptAddrMode.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonOptAddrMode.cpp
@@ -208,7 +208,16 @@ bool HexagonOptAddrMode::allValidCandidates(NodeAddr<StmtNode *> SA,
     NodeAddr<UseNode *> UN = *I;
     RegisterRef UR = UN.Addr->getRegRef(*DFG);
     NodeSet Visited, Defs;
-    const auto &ReachingDefs = LV->getAllReachingDefsRec(UR, UN, Visited, Defs);
+    const auto &P = LV->getAllReachingDefsRec(UR, UN, Visited, Defs);
+    if (!P.second) {
+      DEBUG({
+        dbgs() << "*** Unable to collect all reaching defs for use ***\n"
+               << PrintNode<UseNode*>(UN, *DFG) << '\n'
+               << "The program's complexity may exceed the limits.\n";
+      });
+      return false;
+    }
+    const auto &ReachingDefs = P.first;
     if (ReachingDefs.size() > 1) {
       DEBUG({
         dbgs() << "*** Multiple Reaching Defs found!!! ***\n";