Revert r137310 because it does not optimize any code on ToT

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137466 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index b8c34b4..51aca66 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -213,7 +213,6 @@ namespace {
     SDValue visitLOAD(SDNode *N);
     SDValue visitSTORE(SDNode *N);
     SDValue visitINSERT_VECTOR_ELT(SDNode *N);
-    SDValue visitINSERT_SUBVECTOR(SDNode *N);
     SDValue visitEXTRACT_VECTOR_ELT(SDNode *N);
     SDValue visitBUILD_VECTOR(SDNode *N);
     SDValue visitCONCAT_VECTORS(SDNode *N);
@@ -1103,7 +1102,6 @@ SDValue DAGCombiner::visit(SDNode *N) {
   case ISD::LOAD:               return visitLOAD(N);
   case ISD::STORE:              return visitSTORE(N);
   case ISD::INSERT_VECTOR_ELT:  return visitINSERT_VECTOR_ELT(N);
-  case ISD::INSERT_SUBVECTOR:  return visitINSERT_SUBVECTOR(N);
   case ISD::EXTRACT_VECTOR_ELT: return visitEXTRACT_VECTOR_ELT(N);
   case ISD::BUILD_VECTOR:       return visitBUILD_VECTOR(N);
   case ISD::CONCAT_VECTORS:     return visitCONCAT_VECTORS(N);
@@ -7138,36 +7136,6 @@ SDValue DAGCombiner::visitMEMBARRIER(SDNode* N) {
   }
 }
 
-SDValue DAGCombiner::visitINSERT_SUBVECTOR(SDNode* N) {
-  DebugLoc dl = N->getDebugLoc();
-  EVT VT = N->getValueType(0);
-  // When inserting a subvector into a vector, make sure to start
-  // inserting starting the Zero index. This will allow making the
-  // first insertion using a subreg insertion, and save a register.
-  SDValue V = N->getOperand(0);
-  if (V->getOpcode() == ISD::INSERT_SUBVECTOR && V->hasOneUse()) {
-    ConstantSDNode *N_Idx = dyn_cast<ConstantSDNode>(N->getOperand(2));
-    ConstantSDNode *V_Idx = dyn_cast<ConstantSDNode>(V->getOperand(2));
-    uint64_t Nc = N_Idx->getZExtValue();
-    uint64_t Vc = V_Idx->getZExtValue();
-
-    // Reorder insertion to vector
-    if (Nc < Vc) {
-      SDValue NewV = DAG.getNode(ISD::INSERT_SUBVECTOR, dl, VT,
-                                 V->getOperand(0),
-                                 N->getOperand(1),
-                                 N->getOperand(2));
-      return DAG.getNode(ISD::INSERT_SUBVECTOR, dl, VT,
-                         NewV,
-                         V->getOperand(1),
-                         V->getOperand(2));
-    }
-  }
-
-  return SDValue();
-}
-
-
 /// XformToShuffleWithZero - Returns a vector_shuffle if it able to transform
 /// an AND to a vector_shuffle with the destination vector and a zero vector.
 /// e.g. AND V, <0xffffffff, 0, 0xffffffff, 0>. ==>