diff options
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp index c97300d..310d35d 100644 --- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp @@ -16433,7 +16433,8 @@ SDValue DAGCombiner::visitTRUNCATE(SDNode *N) { case ISD::OR: case ISD::XOR: if (!LegalOperations && N0.hasOneUse() && - (isConstantOrConstantVector(N0.getOperand(0), true) || + (N0.getOperand(0) == N0.getOperand(1) || + isConstantOrConstantVector(N0.getOperand(0), true) || isConstantOrConstantVector(N0.getOperand(1), true))) { // TODO: We already restricted this to pre-legalization, but for vectors // we are extra cautious to not create an unsupported operation. @@ -26876,6 +26877,8 @@ static SDValue combineTruncationShuffle(ShuffleVectorSDNode *SVN, // TODO: handle more extension/truncation cases as cases arise. if (EltSizeInBits != ExtSrcSizeInBits) return SDValue(); + if (VT.getSizeInBits() != N00.getValueSizeInBits()) + return SDValue(); // We can remove *extend_vector_inreg only if the truncation happens at // the same scale as the extension. |