1 files changed, 6 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Scalar/BDCE.cpp b/llvm/lib/Transforms/Scalar/BDCE.cpp
index afe0cd13e22..e5a7ad6388d 100644
--- a/llvm/lib/Transforms/Scalar/BDCE.cpp
+++ b/llvm/lib/Transforms/Scalar/BDCE.cpp
@@ -277,13 +277,17 @@ bool BDCE::runOnFunction(Function& F) {
     if (!isAlwaysLive(&I))
       continue;
 
+    DEBUG(dbgs() << "BDCE: Root: " << I);
     // For integer-valued instructions, set up an initial empty set of alive
     // bits and add the instruction to the work list. For other instructions
     // add their operands to the work list (for integer values operands, mark
     // all bits as live).
     if (IntegerType *IT = dyn_cast<IntegerType>(I.getType())) {
-      AliveBits[&I] = APInt(IT->getBitWidth(), 0);
-      Worklist.push_back(&I);
+      if (!AliveBits.count(&I)) {
+        AliveBits[&I] = APInt(IT->getBitWidth(), 0);
+        Worklist.push_back(&I);
+      }
+
       continue;
     }
 
@@ -388,7 +392,6 @@ bool BDCE::runOnFunction(Function& F) {
     if (isAlwaysLive(&I))
       continue;
 
-    DEBUG(dbgs() << "BDCE: Removing: " << I << " (unused)\n");
     Worklist.push_back(&I);
     I.dropAllReferences();
     Changed = true;