1 files changed, 6 insertions, 1 deletions
diff --git a/include/llvm/CodeGen/FunctionLoweringInfo.h b/include/llvm/CodeGen/FunctionLoweringInfo.h
index b41f30d825..7f41222d9b 100644
--- a/include/llvm/CodeGen/FunctionLoweringInfo.h
+++ b/include/llvm/CodeGen/FunctionLoweringInfo.h
@@ -187,7 +187,12 @@ public:
   /// InvalidatePHILiveOutRegInfo - Invalidates a PHI's LiveOutInfo, to be
   /// called when a block is visited before all of its predecessors.
   void InvalidatePHILiveOutRegInfo(const PHINode *PN) {
-    unsigned Reg = ValueMap[PN];
+    // PHIs with no uses have no ValueMap entry.
+    DenseMap<const Value*, unsigned>::const_iterator It = ValueMap.find(PN);
+    if (It == ValueMap.end())
+      return;
+
+    unsigned Reg = It->second;
     LiveOutRegInfo.grow(Reg);
     LiveOutRegInfo[Reg].IsValid = false;
   }