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Reintroduce r135730, this is indeed the right approach, there is no

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native 256-bit vector instruction to do scalar_to_vector.

llvm-svn: 136001
This commit is contained in:
Bruno Cardoso Lopes 2011-07-25 23:05:16 +00:00
parent ec7f4c86d6
commit c13bd4fd8c
1 changed files with 18 additions and 0 deletions
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18
lib/Target/X86/X86ISelLowering.cpp
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@ -983,6 +983,7 @@ X86TargetLowering::X86TargetLowering(X86TargetMachine &TM)
setOperationAction(ISD::VECTOR_SHUFFLE, SVT, Custom);
setOperationAction(ISD::INSERT_VECTOR_ELT, SVT, Custom);
setOperationAction(ISD::EXTRACT_VECTOR_ELT, SVT, Custom);
setOperationAction(ISD::SCALAR_TO_VECTOR, SVT, Custom);
setOperationAction(ISD::INSERT_SUBVECTOR, SVT, Custom);
}
@ -6324,9 +6325,26 @@ X86TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op, SelectionDAG &DAG) const {
SDValue
X86TargetLowering::LowerSCALAR_TO_VECTOR(SDValue Op, SelectionDAG &DAG) const {
LLVMContext *Context = DAG.getContext();
DebugLoc dl = Op.getDebugLoc();
EVT OpVT = Op.getValueType();
// If this is a 256-bit vector result, first insert into a 128-bit
// vector and then insert into the 256-bit vector.
if (OpVT.getSizeInBits() > 128) {
// Insert into a 128-bit vector.
EVT VT128 = EVT::getVectorVT(*Context,
OpVT.getVectorElementType(),
OpVT.getVectorNumElements() / 2);
Op = DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT128, Op.getOperand(0));
// Insert the 128-bit vector.
return Insert128BitVector(DAG.getNode(ISD::UNDEF, dl, OpVT), Op,
DAG.getConstant(0, MVT::i32),
DAG, dl);
}
if (Op.getValueType() == MVT::v1i64 &&
Op.getOperand(0).getValueType() == MVT::i64)
return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, MVT::v1i64, Op.getOperand(0));