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Add the ability to promote legal integer VAARGs. This is required for the PPC64 SVR4 ABI.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153372 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-03-24 03:53:52 +00:00
parent b54a5eda6d
commit 5194d6dd95
1 changed files with 33 additions and 1 deletions

34
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

@ -718,10 +718,15 @@ void SelectionDAGLegalize::LegalizeOp(SDNode *Node) {
case ISD::INTRINSIC_W_CHAIN:
case ISD::INTRINSIC_WO_CHAIN:
case ISD::INTRINSIC_VOID:
case ISD::VAARG:
case ISD::STACKSAVE:
Action = TLI.getOperationAction(Node->getOpcode(), MVT::Other);
break;
case ISD::VAARG:
Action = TLI.getOperationAction(Node->getOpcode(),
Node->getValueType(0));
if (Action != TargetLowering::Promote)
Action = TLI.getOperationAction(Node->getOpcode(), MVT::Other);
break;
case ISD::SINT_TO_FP:
case ISD::UINT_TO_FP:
case ISD::EXTRACT_VECTOR_ELT:
@ -3528,6 +3533,33 @@ void SelectionDAGLegalize::PromoteNode(SDNode *Node) {
Node->getOpcode() == ISD::SINT_TO_FP, dl);
Results.push_back(Tmp1);
break;
case ISD::VAARG: {
SDValue Chain = Node->getOperand(0); // Get the chain.
SDValue Ptr = Node->getOperand(1); // Get the pointer.
unsigned TruncOp;
if (OVT.isVector()) {
TruncOp = ISD::BITCAST;
} else {
assert(OVT.isInteger()
&& "VAARG promotion is supported only for vectors or integer types");
TruncOp = ISD::TRUNCATE;
}
// Perform the larger operation, then convert back
Tmp1 = DAG.getVAArg(NVT, dl, Chain, Ptr, Node->getOperand(2),
Node->getConstantOperandVal(3));
Chain = Tmp1.getValue(1);
Tmp2 = DAG.getNode(TruncOp, dl, OVT, Tmp1);
// Modified the chain result - switch anything that used the old chain to
// use the new one.
DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 0), Tmp2);
DAG.ReplaceAllUsesOfValueWith(SDValue(Node, 1), Chain);
ReplacedNode(Node);
break;
}
case ISD::AND:
case ISD::OR:
case ISD::XOR: {