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Fix an exponential function in libcall insertion to not be exponential. :)

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25165 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-01-09 23:21:49 +00:00
parent e5cf122869
commit de387ce810
1 changed files with 10 additions and 6 deletions
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16
lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
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@ -3151,8 +3151,10 @@ bool SelectionDAGLegalize::ExpandShift(unsigned Opc, SDOperand Op,SDOperand Amt,
/// FindLatestCallSeqStart - Scan up the dag to find the latest (highest
/// NodeDepth) node that is an CallSeqStart operation and occurs later than
/// Found.
static void FindLatestCallSeqStart(SDNode *Node, SDNode *&Found) {
if (Node->getNodeDepth() <= Found->getNodeDepth()) return;
static void FindLatestCallSeqStart(SDNode *Node, SDNode *&Found,
std::set<SDNode*> &Visited) {
if (Node->getNodeDepth() <= Found->getNodeDepth() ||
!Visited.insert(Node).second) return;
// If we found an CALLSEQ_START, we already know this node occurs later
// than the Found node. Just remember this node and return.
@ -3165,11 +3167,11 @@ static void FindLatestCallSeqStart(SDNode *Node, SDNode *&Found) {
assert(Node->getNumOperands() != 0 &&
"All leaves should have depth equal to the entry node!");
for (unsigned i = 0, e = Node->getNumOperands()-1; i != e; ++i)
FindLatestCallSeqStart(Node->getOperand(i).Val, Found);
FindLatestCallSeqStart(Node->getOperand(i).Val, Found, Visited);
// Tail recurse for the last iteration.
FindLatestCallSeqStart(Node->getOperand(Node->getNumOperands()-1).Val,
Found);
Found, Visited);
}
@ -3247,7 +3249,9 @@ static SDOperand FindInputOutputChains(SDNode *OpNode, SDNode *&OutChain,
SDOperand Entry) {
SDNode *LatestCallSeqStart = Entry.Val;
SDNode *LatestCallSeqEnd = 0;
FindLatestCallSeqStart(OpNode, LatestCallSeqStart);
std::set<SDNode*> Visited;
FindLatestCallSeqStart(OpNode, LatestCallSeqStart, Visited);
Visited.clear();
//std::cerr<<"Found node: "; LatestCallSeqStart->dump(); std::cerr <<"\n";
// It is possible that no ISD::CALLSEQ_START was found because there is no
@ -3265,8 +3269,8 @@ static SDOperand FindInputOutputChains(SDNode *OpNode, SDNode *&OutChain,
// Finally, find the first call that this must come before, first we find the
// CallSeqEnd that ends the call.
OutChain = 0;
std::set<SDNode*> Visited;
FindEarliestCallSeqEnd(OpNode, OutChain, Visited);
Visited.clear();
// If we found one, translate from the adj up to the callseq_start.
if (OutChain)