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Handle indirect call which folds a load manually. This never matches by

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the TableGen generated code since the load's chain result is read by
the callseq_start node.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28416 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-05-20 01:36:52 +00:00
parent 8f7f4cc1ae
commit b245d92328
1 changed files with 58 additions and 0 deletions
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58
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -516,6 +516,13 @@ SDOperand X86DAGToDAGISel::getGlobalBaseReg() {
return CurDAG->getRegister(GlobalBaseReg, MVT::i32);
}
static SDNode *FindCallStartFromCall(SDNode *Node) {
if (Node->getOpcode() == ISD::CALLSEQ_START) return Node;
assert(Node->getOperand(0).getValueType() == MVT::Other &&
"Node doesn't have a token chain argument!");
return FindCallStartFromCall(Node->getOperand(0).Val);
}
void X86DAGToDAGISel::Select(SDOperand &Result, SDOperand N) {
SDNode *Node = N.Val;
MVT::ValueType NVT = Node->getValueType(0);
@ -826,6 +833,57 @@ void X86DAGToDAGISel::Select(SDOperand &Result, SDOperand N) {
return;
}
}
case X86ISD::CALL: {
// Handle indirect call which folds a load here. This never matches by
// the TableGen generated code since the load's chain result is read by
// the callseq_start node.
SDOperand N1 = Node->getOperand(1);
if (N1.getOpcode() == ISD::LOAD && N1.hasOneUse() &&
!CodeGenMap.count(N1.getValue(0))) {
SDOperand Chain = Node->getOperand(0);
SDNode *CallStart = FindCallStartFromCall(Chain.Val);
if (!CallStart || CallStart->getOperand(0).Val != N1.Val)
break;
SDOperand Base, Scale, Index, Disp;
if (SelectAddr(N1.getOperand(1), Base, Scale, Index, Disp)) {
Select(Base, Base);
Select(Scale, Scale);
Select(Index, Index);
Select(Disp, Disp);
Select(Chain, Chain);
bool HasOptInFlag = false;
SDOperand InFlag;
if (N.getNumOperands() == 3) {
Select(InFlag, N.getOperand(2));
HasOptInFlag = true;
}
SDNode *ResNode;
if (HasOptInFlag)
ResNode = CurDAG->getTargetNode(X86::CALL32m, MVT::Other, MVT::Flag,
Base, Scale, Index, Disp, Chain,
InFlag);
else
ResNode = CurDAG->getTargetNode(X86::CALL32m, MVT::Other, MVT::Flag,
Base, Scale, Index, Disp, Chain);
SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 0, Chain.Val,
Chain.ResNo);
SelectionDAG::InsertISelMapEntry(CodeGenMap, N1.Val, 1, ResNode, 0);
SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 1, ResNode, 1);
Result = SDOperand(ResNode, 0);
#ifndef NDEBUG
DEBUG(std::cerr << std::string(Indent-2, ' '));
DEBUG(std::cerr << "== ");
DEBUG(Result.Val->dump(CurDAG));
DEBUG(std::cerr << "\n");
Indent -= 2;
#endif
return;
}
}
}
}
SelectCode(Result, N);