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| author | Dan Gohman <gohman@apple.com> | 2008-11-05 22:56:47 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2008-11-05 22:56:47 +0000 |
| commit | fb25657f4bbc43a7174396d089cacc6cc84d15ce (patch) | |
| tree | 3c6bea29f1f883df7e2a916114bef24bf0bcdae4 /include/llvm/CodeGen/DAGISelHeader.h | |
| parent | c0127f1d421cc01eb0cc04e9b5b89b92f8aad77f (diff) | |
| download | external_llvm-fb25657f4bbc43a7174396d089cacc6cc84d15ce.zip external_llvm-fb25657f4bbc43a7174396d089cacc6cc84d15ce.tar.gz external_llvm-fb25657f4bbc43a7174396d089cacc6cc84d15ce.tar.bz2 | |
Make ISel ignore dead nodes. The DAGCombiner normally eliminates
dead nodes, but in this case its missing one. Fixing the DAGCombiner
is desirable, but it's somewhat involved.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@58777 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/CodeGen/DAGISelHeader.h')
| -rw-r--r-- | include/llvm/CodeGen/DAGISelHeader.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/DAGISelHeader.h b/include/llvm/CodeGen/DAGISelHeader.h index 3b4da66..28b2277 100644 --- a/include/llvm/CodeGen/DAGISelHeader.h +++ b/include/llvm/CodeGen/DAGISelHeader.h @@ -108,6 +108,11 @@ void SelectRoot(SelectionDAG &DAG) { // node). while (ISelPosition != CurDAG->allnodes_begin()) { SDNode *Node = --ISelPosition; + // Skip dead nodes. DAGCombiner is expected to eliminate all dead nodes, + // but there are currently some corner cases that it misses. Also, this + // makes it theoretically possible to disable the DAGCombiner. + if (Node->use_empty()) + continue; #if 0 DAG.setSubgraphColor(Node, "red"); #endif |