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Implement support for custom legalization in DAGTypeLegalizer::ExpandOperand.

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Unbreak Duncan's carefully written path compression where I didn't realize
what was happening!

llvm-svn: 44301
This commit is contained in:
Chris Lattner 2007-11-24 18:11:42 +00:00
parent 28262fbaf2
commit c06f8366b4
1 changed files with 41 additions and 28 deletions
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69
lib/CodeGen/SelectionDAG/LegalizeDAGTypes.cpp
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@ -469,9 +469,13 @@ void DAGTypeLegalizer::ReplaceNodeWith(SDNode *From, SDNode *To) {
/// RemapNode - If the specified value was already legalized to another value,
/// replace it by that value.
void DAGTypeLegalizer::RemapNode(SDOperand &N) {
for (DenseMap<SDOperand, SDOperand>::iterator I = ReplacedNodes.find(N);
I != ReplacedNodes.end(); I = ReplacedNodes.find(N))
DenseMap<SDOperand, SDOperand>::iterator I = ReplacedNodes.find(N);
if (I != ReplacedNodes.end()) {
// Use path compression to speed up future lookups if values get multiply
// replaced with other values.
RemapNode(I->second);
N = I->second;
}
}
void DAGTypeLegalizer::SetPromotedOp(SDOperand Op, SDOperand Result) {
@ -842,8 +846,8 @@ void DAGTypeLegalizer::ExpandResult(SDNode *N, unsigned ResNo) {
TargetLowering::Custom) {
// If the target wants to, allow it to lower this itself.
if (SDNode *P = TLI.ExpandOperationResult(N, DAG)) {
// Everything that once used N now uses P. P had better not require
// custom expansion.
// Everything that once used N now uses P. We are guaranteed that the
// result value types of N and the result value types of P match.
ReplaceNodeWith(N, P);
return;
}
@ -1774,32 +1778,41 @@ SDOperand DAGTypeLegalizer::PromoteOperand_STORE(StoreSDNode *N, unsigned OpNo){
/// need promotion or expansion as well as the specified one.
bool DAGTypeLegalizer::ExpandOperand(SDNode *N, unsigned OpNo) {
DEBUG(cerr << "Expand node operand: "; N->dump(&DAG); cerr << "\n");
SDOperand Res;
switch (N->getOpcode()) {
default:
#ifndef NDEBUG
cerr << "ExpandOperand Op #" << OpNo << ": ";
N->dump(&DAG); cerr << "\n";
#endif
assert(0 && "Do not know how to expand this operator's operand!");
abort();
case ISD::TRUNCATE: Res = ExpandOperand_TRUNCATE(N); break;
case ISD::BIT_CONVERT: Res = ExpandOperand_BIT_CONVERT(N); break;
SDOperand Res(0, 0);
if (TLI.getOperationAction(N->getOpcode(), N->getValueType(0)) ==
TargetLowering::Custom)
Res = TLI.LowerOperation(SDOperand(N, 0), DAG);
if (Res.Val == 0) {
switch (N->getOpcode()) {
default:
#ifndef NDEBUG
cerr << "ExpandOperand Op #" << OpNo << ": ";
N->dump(&DAG); cerr << "\n";
#endif
assert(0 && "Do not know how to expand this operator's operand!");
abort();
case ISD::TRUNCATE: Res = ExpandOperand_TRUNCATE(N); break;
case ISD::BIT_CONVERT: Res = ExpandOperand_BIT_CONVERT(N); break;
case ISD::SINT_TO_FP:
Res = ExpandOperand_SINT_TO_FP(N->getOperand(0), N->getValueType(0));
break;
case ISD::UINT_TO_FP:
Res = ExpandOperand_UINT_TO_FP(N->getOperand(0), N->getValueType(0));
break;
case ISD::EXTRACT_ELEMENT: Res = ExpandOperand_EXTRACT_ELEMENT(N); break;
case ISD::SETCC: Res = ExpandOperand_SETCC(N); break;
case ISD::SINT_TO_FP:
Res = ExpandOperand_SINT_TO_FP(N->getOperand(0), N->getValueType(0));
break;
case ISD::UINT_TO_FP:
Res = ExpandOperand_UINT_TO_FP(N->getOperand(0), N->getValueType(0));
break;
case ISD::EXTRACT_ELEMENT: Res = ExpandOperand_EXTRACT_ELEMENT(N); break;
case ISD::SETCC: Res = ExpandOperand_SETCC(N); break;
case ISD::STORE: Res = ExpandOperand_STORE(cast<StoreSDNode>(N), OpNo); break;
case ISD::MEMSET:
case ISD::MEMCPY:
case ISD::MEMMOVE: Res = HandleMemIntrinsic(N); break;
case ISD::STORE:
Res = ExpandOperand_STORE(cast<StoreSDNode>(N), OpNo);
break;
case ISD::MEMSET:
case ISD::MEMCPY:
case ISD::MEMMOVE: Res = HandleMemIntrinsic(N); break;
}
}
// If the result is null, the sub-method took care of registering results etc.