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[AVX] Add INSERT_SUBVECTOR and support it on x86. This provides a

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default implementation for x86, going through the stack in a similr
fashion to how the codegen implements BUILD_VECTOR.  Eventually this
will get matched to VINSERTF128 if AVX is available.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124307 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Greene
2011-01-26 19:13:22 +00:00
parent d2c9793bdf
commit cfe33c46aa
6 changed files with 105 additions and 1 deletions
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48
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -171,6 +171,7 @@ private:
SDValue ExpandBitCount(unsigned Opc, SDValue Op, DebugLoc dl);
SDValue ExpandExtractFromVectorThroughStack(SDValue Op);
SDValue ExpandInsertToVectorThroughStack(SDValue Op);
SDValue ExpandVectorBuildThroughStack(SDNode* Node);
std::pair<SDValue, SDValue> ExpandAtomic(SDNode *Node);
@ -1588,6 +1589,50 @@ SDValue SelectionDAGLegalize::ExpandExtractFromVectorThroughStack(SDValue Op) {
false, false, 0);
}
SDValue SelectionDAGLegalize::ExpandInsertToVectorThroughStack(SDValue Op) {
assert(Op.getValueType().isVector() && "Non-vector insert subvector!");
SDValue Vec = Op.getOperand(0);
SDValue Part = Op.getOperand(1);
SDValue Idx = Op.getOperand(2);
DebugLoc dl = Op.getDebugLoc();
// Store the value to a temporary stack slot, then LOAD the returned part.
SDValue StackPtr = DAG.CreateStackTemporary(Vec.getValueType());
int FI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
MachinePointerInfo PtrInfo = MachinePointerInfo::getFixedStack(FI);
// First store the whole vector.
SDValue Ch = DAG.getStore(DAG.getEntryNode(), dl, Vec, StackPtr, PtrInfo,
false, false, 0);
// Then store the inserted part.
// Add the offset to the index.
unsigned EltSize =
Vec.getValueType().getVectorElementType().getSizeInBits()/8;
Idx = DAG.getNode(ISD::MUL, dl, Idx.getValueType(), Idx,
DAG.getConstant(EltSize, Idx.getValueType()));
if (Idx.getValueType().bitsGT(TLI.getPointerTy()))
Idx = DAG.getNode(ISD::TRUNCATE, dl, TLI.getPointerTy(), Idx);
else
Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
SDValue SubStackPtr = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
StackPtr);
// Store the subvector.
Ch = DAG.getStore(DAG.getEntryNode(), dl, Part, SubStackPtr,
MachinePointerInfo(), false, false, 0);
// Finally, load the updated vector.
return DAG.getLoad(Op.getValueType(), dl, Ch, StackPtr, PtrInfo,
false, false, 0);
}
SDValue SelectionDAGLegalize::ExpandVectorBuildThroughStack(SDNode* Node) {
// We can't handle this case efficiently. Allocate a sufficiently
// aligned object on the stack, store each element into it, then load
@ -2806,6 +2851,9 @@ void SelectionDAGLegalize::ExpandNode(SDNode *Node,
case ISD::EXTRACT_SUBVECTOR:
Results.push_back(ExpandExtractFromVectorThroughStack(SDValue(Node, 0)));
break;
case ISD::INSERT_SUBVECTOR:
Results.push_back(ExpandInsertToVectorThroughStack(SDValue(Node, 0)));
break;
case ISD::CONCAT_VECTORS: {
Results.push_back(ExpandVectorBuildThroughStack(Node));
break;