1 files changed, 12 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index bd79cd56a18..4bf889c5a54 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -172,6 +172,18 @@ bool llvm::haveNoCommonBitsSet(const Value *LHS, const Value *RHS,
 }
 
 
+bool llvm::isOnlyUsedInZeroEqualityComparison(const Instruction *CxtI) {
+  for (const User *U : CxtI->users()) {
+    if (const ICmpInst *IC = dyn_cast<ICmpInst>(U))
+      if (IC->isEquality())
+        if (Constant *C = dyn_cast<Constant>(IC->getOperand(1)))
+          if (C->isNullValue())
+            continue;
+    return false;
+  }
+  return true;
+}
+
 static bool isKnownToBeAPowerOfTwo(const Value *V, bool OrZero, unsigned Depth,
                                    const Query &Q);