Fix another variant of PR 7191. Also add a testcase

Mon Ping provided; unfortunately bugpoint failed to
reduce it, but I think it's important to have a test for
this in the suite.  8023512.

llvm-svn: 104624

1 files changed, 5 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index df1a0a353ee..6bddd784fe8 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3832,8 +3832,12 @@ SDValue DAGCombiner::visitANY_EXTEND(SDNode *N) {
   if (N0.getOpcode() == ISD::TRUNCATE) {
     SDValue NarrowLoad = ReduceLoadWidth(N0.getNode());
     if (NarrowLoad.getNode()) {
-      if (NarrowLoad.getNode() != N0.getNode())
+      SDNode* oye = N0.getNode()->getOperand(0).getNode();
+      if (NarrowLoad.getNode() != N0.getNode()) {
         CombineTo(N0.getNode(), NarrowLoad);
+        // CombineTo deleted the truncate, if needed, but not what's under it.
+        AddToWorkList(oye);
+      }
       return DAG.getNode(ISD::ANY_EXTEND, N->getDebugLoc(), VT, NarrowLoad);
     }
   }