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Teach Legalize how to do something with EXTRACT_ELEMENT when the type of

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the pair of elements is a legal type.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23804 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2005-10-19 00:06:56 +00:00
parent da32c9eed6
commit 5dc897b0e4
1 changed files with 30 additions and 7 deletions
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37
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -955,14 +955,37 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) {
}
assert(0 && "Unreachable");
}
case ISD::EXTRACT_ELEMENT:
// Get both the low and high parts.
ExpandOp(Node->getOperand(0), Tmp1, Tmp2);
if (cast<ConstantSDNode>(Node->getOperand(1))->getValue())
Result = Tmp2; // 1 -> Hi
else
Result = Tmp1; // 0 -> Lo
case ISD::EXTRACT_ELEMENT: {
MVT::ValueType OpTy = Node->getOperand(0).getValueType();
switch (getTypeAction(OpTy)) {
default:
assert(0 && "EXTRACT_ELEMENT action for type unimplemented!");
break;
case Legal:
if (cast<ConstantSDNode>(Node->getOperand(1))->getValue()) {
// 1 -> Hi
Result = DAG.getNode(ISD::SRL, OpTy, Node->getOperand(0),
DAG.getConstant(MVT::getSizeInBits(OpTy)/2,
TLI.getShiftAmountTy()));
Result = DAG.getNode(ISD::TRUNCATE, Node->getValueType(0), Result);
} else {
// 0 -> Lo
Result = DAG.getNode(ISD::TRUNCATE, Node->getValueType(0),
Node->getOperand(0));
}
Result = LegalizeOp(Result);
break;
case Expand:
// Get both the low and high parts.
ExpandOp(Node->getOperand(0), Tmp1, Tmp2);
if (cast<ConstantSDNode>(Node->getOperand(1))->getValue())
Result = Tmp2; // 1 -> Hi
else
Result = Tmp1; // 0 -> Lo
break;
}
break;
}
case ISD::CopyToReg:
Tmp1 = LegalizeOp(Node->getOperand(0)); // Legalize the chain.