diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 957987fe3f4..1db9f1274d0 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -41961,6 +41961,13 @@ static SDValue combineInsertSubvector(SDNode *N, SelectionDAG &DAG, SubVec.getOpcode() == X86ISD::SUBV_BROADCAST)) return DAG.getNode(SubVec.getOpcode(), dl, OpVT, SubVec.getOperand(0)); + // concat_vectors(scalar_to_vector(x),scalar_to_vector(x)) -> broadcast(x) + if (SubVec == SubVec2 && SubVec.getOpcode() == ISD::SCALAR_TO_VECTOR && + (Subtarget.hasAVX2() || (OpVT.getScalarSizeInBits() >= 32 && + MayFoldLoad(SubVec.getOperand(0)))) && + SubVec.getOperand(0).getValueType() == OpVT.getScalarType()) + return DAG.getNode(X86ISD::VBROADCAST, dl, OpVT, SubVec.getOperand(0)); + // If we're inserting all zeros into the upper half, change this to // an insert into an all zeros vector. We will match this to a move // with implicit upper bit zeroing during isel. |
