Revert "[DAGCombiner] (add X, (adde Y, 0, Carry)) -> (adde X, Y, Carry)"

This reverts commit r294186.

On an internal test, this triggers an out-of-memory error on PPC,
presumably because there is another dagcombine that does the exact
opposite triggering and endless loop consuming more and more memory.

Chandler has started at creating a reduced test case and we'll attach it
as soon as possible.

llvm-svn: 294288

1 files changed, 0 insertions, 6 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 97ec5d6b2d7..91f462d2d41 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -1834,12 +1834,6 @@ SDValue DAGCombiner::visitADDLike(SDValue N0, SDValue N1, SDNode *LocReference)
     }
   }
 
-  // (add X, (adde Y, 0, Carry)) -> (adde X, Y, Carry)
-  if (N1.getOpcode() == ISD::ADDE && N1->hasOneUse() &&
-      isNullConstant(N1.getOperand(1)))
-    return DAG.getNode(ISD::ADDE, DL, DAG.getVTList(VT, MVT::Glue),
-                       N0, N1->getOperand(0), N1->getOperand(2));
-
   return SDValue();
 }