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
This commit is contained in:
Dan Gohman
2008-11-05 22:56:47 +00:00
parent 8ad0919786
commit 33a9cb4f40
2 changed files with 27 additions and 0 deletions

View File

@@ -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