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Implement expand of BUILD_VECTOR containing variable elements.

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This implements CodeGen/Generic/vector.ll:test_variable_buildvector


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26852 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-03-19 04:18:56 +00:00
parent ca24244234
commit 5fcd0350be
1 changed files with 32 additions and 2 deletions
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34
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -779,8 +779,38 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
// Otherwise, this isn't a constant entry. Allocate a sufficiently
// aligned object on the stack, store each element into it, then load
// the result as a vector.
assert(0 && "Cannot lower variable BUILD_VECTOR yet!");
abort();
MVT::ValueType VT = Node->getValueType(0);
// Create the stack frame object.
MachineFrameInfo *FrameInfo = DAG.getMachineFunction().getFrameInfo();
unsigned ByteSize = MVT::getSizeInBits(VT)/8;
int FrameIdx = FrameInfo->CreateStackObject(ByteSize, ByteSize);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, TLI.getPointerTy());
// Emit a store of each element to the stack slot.
std::vector<SDOperand> Stores;
bool isLittleEndian = TLI.isLittleEndian();
unsigned TypeByteSize =
MVT::getSizeInBits(Node->getOperand(0).getValueType())/8;
unsigned VectorSize = MVT::getSizeInBits(VT)/8;
// Store (in the right endianness) the elements to memory.
for (unsigned i = 0, e = Node->getNumOperands(); i != e; ++i) {
unsigned Offset;
if (isLittleEndian)
Offset = TypeByteSize*i;
else
Offset = TypeByteSize*(e-i-1);
SDOperand Idx = DAG.getConstant(Offset, FIPtr.getValueType());
Idx = DAG.getNode(ISD::ADD, FIPtr.getValueType(), FIPtr, Idx);
Stores.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getEntryNode(),
Node->getOperand(i), Idx,
DAG.getSrcValue(NULL)));
}
SDOperand StoreChain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores);
// Result is a load from the stack slot.
Result = DAG.getLoad(VT, StoreChain, FIPtr, DAG.getSrcValue(0));
break;
}
}