diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -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 3bc9cf06ad..4c1710dd81 100644 --- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -4937,6 +4937,8 @@ SDValue DAGCombiner::ReduceLoadOpStoreWidth(SDNode *N) { APInt Imm = cast<ConstantSDNode>(N1)->getAPIntValue(); if (Opc == ISD::AND) Imm ^= APInt::getAllOnesValue(BitWidth); + if (Imm == 0 || Imm.isAllOnesValue()) + return SDValue(); unsigned ShAmt = Imm.countTrailingZeros(); unsigned MSB = BitWidth - Imm.countLeadingZeros() - 1; unsigned NewBW = NextPowerOf2(MSB - ShAmt); |