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When preselecting, favor things that have low depth to select first. This

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is faster and uses less stack space.  This reduces our stack requirement
enough to compile sixtrack, and though it's a hack, should be enough until
we switch to iterative isel

llvm-svn: 23664
This commit is contained in:
Chris Lattner 2005-10-07 22:10:27 +00:00
parent f8b0332dfc
commit 6809d07aa5
1 changed files with 8 additions and 5 deletions
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13
lib/Target/PowerPC/PPCISelDAGToDAG.cpp
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@ -123,6 +123,11 @@ void PPC32DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
SDOperand Node = Worklist.back();
Worklist.pop_back();
// Chose from the least deep of the top two nodes.
if (!Worklist.empty() &&
Worklist.back().Val->getNodeDepth() < Node.Val->getNodeDepth())
std::swap(Worklist.back(), Node);
if ((Node.Val->getOpcode() >= ISD::BUILTIN_OP_END &&
Node.Val->getOpcode() < PPCISD::FIRST_NUMBER) ||
CodeGenMap.count(Node)) continue;
@ -142,7 +147,7 @@ void PPC32DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
// Finally, legalize this node.
Select(Node);
}
// Select target instructions for the DAG.
DAG.setRoot(Select(DAG.getRoot()));
CodeGenMap.clear();
@ -1026,7 +1031,7 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
New = CurDAG->getNode(ISD::TokenFactor, MVT::Other, Ops);
}
if (!N->hasOneUse()) CodeGenMap[Op] = New;
CodeGenMap[Op] = New;
return New;
}
case ISD::CopyFromReg: {
@ -1042,7 +1047,7 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
SDOperand Val = Select(N->getOperand(2));
SDOperand New = CurDAG->getNode(ISD::CopyToReg, MVT::Other,
Chain, Reg, Val);
if (!N->hasOneUse()) CodeGenMap[Op] = New;
CodeGenMap[Op] = New;
return New;
}
case ISD::UNDEF:
@ -1354,7 +1359,6 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
Select(N->getOperand(0)));
return SDOperand(N, 0);
}
case ISD::LOAD:
case ISD::EXTLOAD:
case ISD::ZEXTLOAD:
@ -1402,7 +1406,6 @@ SDOperand PPC32DAGToDAGISel::Select(SDOperand Op) {
return Ext;
}
}
case ISD::TRUNCSTORE:
case ISD::STORE: {
SDOperand AddrOp1, AddrOp2;