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

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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46305 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-01-24 07:18:21 +00:00
parent 0aa5e6f3fb
commit 20e3d86766
1 changed files with 5 additions and 0 deletions
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5
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
AddToWorkList(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
// process a node that has been replaced.