1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 8fc7eab..95f53fe 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4762,6 +4762,11 @@ unsigned SelectionDAG::ComputeNumSignBits(SDValue Op, const APInt &DemandedElts,
   case ISD::AssertZext:
     Tmp = cast<VTSDNode>(Op.getOperand(1))->getVT().getSizeInBits();
     return VTBits-Tmp;
+  case ISD::FREEZE:
+    if (isGuaranteedNotToBeUndefOrPoison(Op.getOperand(0), DemandedElts,
+                                         /*PoisonOnly=*/false))
+      return ComputeNumSignBits(Op.getOperand(0), DemandedElts, Depth + 1);
+    break;
   case ISD::MERGE_VALUES:
     return ComputeNumSignBits(Op.getOperand(Op.getResNo()), DemandedElts,
                               Depth + 1);