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The dag combiner is missing revisiting nodes that it really should, and thus leaving 

dead stuff around.  This gets fed into the isel pass and causes certain foldings from
happening because nodes have extraneous uses floating around.  For example, if we turned
foo(bar(x)) -> baz(x), we sometimes left bar(x) around.

llvm-svn: 46305
This commit is contained in:
Chris Lattner 2008-01-24 07:18:21 +00:00
parent 0feb1b0f84
commit d66eac62fd
1 changed files with 5 additions and 0 deletions
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5
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -606,6 +606,11 @@ void DAGCombiner::Run(bool RunningAfterLegalize) {
// Push the new node and any users onto the worklist // Push the new node and any users onto the worklist
AddToWorkList(RV.Val); AddToWorkList(RV.Val);
AddUsersToWorkList(RV.Val); AddUsersToWorkList(RV.Val);
// Add any uses of the old node to the worklist if they have a single
// use. They may be 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 // Nodes can be reintroduced into the worklist. Make sure we do not
// process a node that has been replaced. // process a node that has been replaced.