diff options
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index 4fb50e30db..f1e43a9024 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -3277,6 +3277,8 @@ SDValue DAGCombiner::GetDemandedBits(SDValue V, const APInt &Mask) { if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(V.getOperand(1))) { // See if we can recursively simplify the LHS. unsigned Amt = RHSC->getZExtValue(); + // Watch out for shift count overflow though. + if (Amt >= Mask.getBitWidth()) break; APInt NewMask = Mask << Amt; SDValue SimplifyLHS = GetDemandedBits(V.getOperand(0), NewMask); if (SimplifyLHS.getNode()) { |