1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 244aa798a9c..d926b3864de 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -1400,6 +1400,11 @@ static void computeKnownBitsFromOperator(const Operator *I, APInt &KnownZero,
     if (const IntrinsicInst *II = dyn_cast<IntrinsicInst>(I)) {
       switch (II->getIntrinsicID()) {
       default: break;
+      case Intrinsic::bitreverse:
+        computeKnownBits(I->getOperand(0), KnownZero2, KnownOne2, Depth + 1, Q);
+        KnownZero = KnownZero2.reverseBits();
+        KnownOne = KnownOne2.reverseBits();
+        break;
       case Intrinsic::bswap:
         computeKnownBits(I->getOperand(0), KnownZero2, KnownOne2, Depth + 1, Q);
         KnownZero |= KnownZero2.byteSwap();