diff options
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index f22e8934fff..84009979ea1 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -32866,8 +32866,10 @@ static SDValue combineShuffleOfConcatUndef(SDNode *N, SelectionDAG &DAG, /// Eliminate a redundant shuffle of a horizontal math op. static SDValue foldShuffleOfHorizOp(SDNode *N) { - if (N->getOpcode() != ISD::VECTOR_SHUFFLE || !N->getOperand(1).isUndef()) - return SDValue(); + unsigned Opcode = N->getOpcode(); + if (Opcode != X86ISD::MOVDDUP) + if (Opcode != ISD::VECTOR_SHUFFLE || !N->getOperand(1).isUndef()) + return SDValue(); SDValue HOp = N->getOperand(0); if (HOp.getOpcode() != X86ISD::HADD && HOp.getOpcode() != X86ISD::FHADD && @@ -32885,6 +32887,13 @@ static SDValue foldShuffleOfHorizOp(SDNode *N) { // When the operands of a horizontal math op are identical, the low half of // the result is the same as the high half. If the shuffle is also replicating // low and high halves, we don't need the shuffle. + if (Opcode == X86ISD::MOVDDUP) { + // movddup (hadd X, X) --> hadd X, X + assert((HOp.getValueType() == MVT::v2f64 || + HOp.getValueType() == MVT::v4f64) && "Unexpected type for h-op"); + return HOp; + } + // shuffle (hadd X, X), undef, [low half...high half] --> hadd X, X ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(N)->getMask(); // TODO: Other mask possibilities like {1,1} and {1,0} could be added here, |
