Revert this dag combine change:

Fold (zext (and x, cst)) -> (and (zext x), cst)

DAG combiner likes to optimize expression in the other way so this would end up cause an infinite looping.

llvm-svn: 91574

1 files changed, 0 insertions, 13 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 2b521878600..6cef23981ca 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3202,19 +3202,6 @@ SDValue DAGCombiner::visitZERO_EXTEND(SDNode *N) {
                        X, DAG.getConstant(Mask, VT));
   }
 
-  // Fold (zext (and x, cst)) -> (and (zext x), cst)
-  if (N0.getOpcode() == ISD::AND &&
-      N0.getOperand(1).getOpcode() == ISD::Constant &&
-      N0.getOperand(0).getOpcode() != ISD::TRUNCATE &&
-      N0.getOperand(0).hasOneUse()) {
-    APInt Mask = cast<ConstantSDNode>(N0.getOperand(1))->getAPIntValue();
-    Mask.zext(VT.getSizeInBits());
-    return DAG.getNode(ISD::AND, N->getDebugLoc(), VT,
-                       DAG.getNode(ISD::ZERO_EXTEND, N->getDebugLoc(), VT,
-                                   N0.getOperand(0)),
-                       DAG.getConstant(Mask, VT));
-  }
-
   // fold (zext (load x)) -> (zext (truncate (zextload x)))
   if (ISD::isNON_EXTLoad(N0.getNode()) &&
       ((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||