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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46377 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-25 23:34:24 +00:00
parent 0298dbf019
commit 50d8e491a2
1 changed files with 43 additions and 41 deletions
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84
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -582,49 +582,51 @@ void DAGCombiner::Run(bool RunningAfterLegalize) {
SDOperand RV = combine(N);
if (RV.Val) {
++NodesCombined;
// If we get back the same node we passed in, rather than a new node or
// zero, we know that the node must have defined multiple values and
// CombineTo was used. Since CombineTo takes care of the worklist
// mechanics for us, we have no work to do in this case.
if (RV.Val != N) {
assert(N->getOpcode() != ISD::DELETED_NODE &&
RV.Val->getOpcode() != ISD::DELETED_NODE &&
"Node was deleted but visit returned new node!");
if (RV.Val == 0)
continue;
++NodesCombined;
// If we get back the same node we passed in, rather than a new node or
// zero, we know that the node must have defined multiple values and
// CombineTo was used. Since CombineTo takes care of the worklist
// mechanics for us, we have no work to do in this case.
if (RV.Val == N)
continue;
assert(N->getOpcode() != ISD::DELETED_NODE &&
RV.Val->getOpcode() != ISD::DELETED_NODE &&
"Node was deleted but visit returned new node!");
DOUT << "\nReplacing.3 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith: "; DEBUG(RV.Val->dump(&DAG));
DOUT << '\n';
std::vector<SDNode*> NowDead;
if (N->getNumValues() == RV.Val->getNumValues())
DAG.ReplaceAllUsesWith(N, RV.Val, &NowDead);
else {
assert(N->getValueType(0) == RV.getValueType() && "Type mismatch");
SDOperand OpV = RV;
DAG.ReplaceAllUsesWith(N, &OpV, &NowDead);
}
// Push the new node and any users onto the worklist
AddToWorkList(RV.Val);
AddUsersToWorkList(RV.Val);
// Add any uses of the old node to the worklist in case this node is the
// last one that uses them. They may become dead after this node is
// deleted.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
AddToWorkList(N->getOperand(i).Val);
// Nodes can be reintroduced into the worklist. Make sure we do not
// process a node that has been replaced.
removeFromWorkList(N);
for (unsigned i = 0, e = NowDead.size(); i != e; ++i)
removeFromWorkList(NowDead[i]);
// Finally, since the node is now dead, remove it from the graph.
DAG.DeleteNode(N);
}
DOUT << "\nReplacing.3 "; DEBUG(N->dump(&DAG));
DOUT << "\nWith: "; DEBUG(RV.Val->dump(&DAG));
DOUT << '\n';
std::vector<SDNode*> NowDead;
if (N->getNumValues() == RV.Val->getNumValues())
DAG.ReplaceAllUsesWith(N, RV.Val, &NowDead);
else {
assert(N->getValueType(0) == RV.getValueType() && "Type mismatch");
SDOperand OpV = RV;
DAG.ReplaceAllUsesWith(N, &OpV, &NowDead);
}
// Push the new node and any users onto the worklist
AddToWorkList(RV.Val);
AddUsersToWorkList(RV.Val);
// Add any uses of the old node to the worklist in case this node is the
// last one that uses them. They may become dead after this node is
// deleted.
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
AddToWorkList(N->getOperand(i).Val);
// Nodes can be reintroduced into the worklist. Make sure we do not
// process a node that has been replaced.
removeFromWorkList(N);
for (unsigned i = 0, e = NowDead.size(); i != e; ++i)
removeFromWorkList(NowDead[i]);
// Finally, since the node is now dead, remove it from the graph.
DAG.DeleteNode(N);
}
// If the root changed (e.g. it was a dead load, update the root).