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Add users of a MERGE_VALUE node to the worklist to process again when the node is removed. Sorry, no test case. Foudn it by inspection of the code 

llvm-svn: 158839
This commit is contained in:
Pete Cooper 2012-06-20 19:35:43 +00:00
parent cc6a908c39
commit fe5b84b404
1 changed files with 3 additions and 0 deletions
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llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1322,6 +1322,9 @@ SDValue DAGCombiner::visitMERGE_VALUES(SDNode *N) {
// Replacing results may cause a different MERGE_VALUES to suddenly
// be CSE'd with N, and carry its uses with it. Iterate until no
// uses remain, to ensure that the node can be safely deleted.
// First add the users of this node to the work list so that they
// can be tried again once they have new operands.
AddUsersToWorkList(N);
do {
for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i)
DAG.ReplaceAllUsesOfValueWith(SDValue(N, i), N->getOperand(i));