1 files changed, 13 insertions, 0 deletions
diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index bd79cd56a18b..a5dceb6c2271 100644
--- a/lib/Analysis/ValueTracking.cpp
+++ b/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);
 
@@ -2327,6 +2339,7 @@ bool llvm::ComputeMultiple(Value *V, unsigned Base, Value *&Multiple,
   case Instruction::SExt:
     if (!LookThroughSExt) return false;
     // otherwise fall through to ZExt
+    LLVM_FALLTHROUGH;
   case Instruction::ZExt:
     return ComputeMultiple(I->getOperand(0), Base, Multiple,
                            LookThroughSExt, Depth+1);