diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index aa9da930639..1d39e54a5b0 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -23937,9 +23937,19 @@ static SDValue PerformTargetShuffleCombine(SDValue N, SelectionDAG &DAG, SDValue Op1 = N.getOperand(1); SDValue Op2 = N.getOperand(2); unsigned InsertPSMask = cast<ConstantSDNode>(Op2)->getZExtValue(); - unsigned DstIdx = (InsertPSMask >> 4) & 3; + unsigned DstIdx = (InsertPSMask >> 4) & 0x3; + unsigned ZeroMask = InsertPSMask & 0xF; + + // If we zero out all elements from Op0 then we don't need to reference it. + if (((ZeroMask | (1u << DstIdx)) == 0xF) && !Op0.isUndef()) + return DAG.getNode(X86ISD::INSERTPS, DL, VT, DAG.getUNDEF(VT), Op1, + DAG.getConstant(InsertPSMask, DL, MVT::i8)); + + // If we zero out the element from Op1 then we don't need to reference it. + if ((ZeroMask & (1u << DstIdx)) && !Op1.isUndef()) + return DAG.getNode(X86ISD::INSERTPS, DL, VT, Op0, DAG.getUNDEF(VT), + DAG.getConstant(InsertPSMask, DL, MVT::i8)); - // Attempt to merge insertps with an inner target shuffle node. SmallVector<int, 8> TargetMask; if (!setTargetShuffleZeroElements(Op0, TargetMask)) return SDValue(); @@ -23979,7 +23989,7 @@ static SDValue PerformTargetShuffleCombine(SDValue N, SelectionDAG &DAG, } if (Updated) - return DAG.getNode(X86ISD::INSERTPS, DL, MVT::v4f32, Op0, Op1, + return DAG.getNode(X86ISD::INSERTPS, DL, VT, Op0, Op1, DAG.getConstant(InsertPSMask, DL, MVT::i8)); return SDValue(); |
