Revert r262599 "[X86][SSE] Improve vector ZERO_EXTEND by combining to ZERO_EXTEND_VECTOR_INREG"

This caused PR26870.

llvm-svn: 262935

1 files changed, 1 insertions, 18 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index b7c468a9579..fd47bb30246 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -273,7 +273,6 @@ namespace {
     SDValue visitANY_EXTEND(SDNode *N);
     SDValue visitSIGN_EXTEND_INREG(SDNode *N);
     SDValue visitSIGN_EXTEND_VECTOR_INREG(SDNode *N);
-    SDValue visitZERO_EXTEND_VECTOR_INREG(SDNode *N);
     SDValue visitTRUNCATE(SDNode *N);
     SDValue visitBITCAST(SDNode *N);
     SDValue visitBUILD_PAIR(SDNode *N);
@@ -1397,7 +1396,6 @@ SDValue DAGCombiner::visit(SDNode *N) {
   case ISD::ANY_EXTEND:         return visitANY_EXTEND(N);
   case ISD::SIGN_EXTEND_INREG:  return visitSIGN_EXTEND_INREG(N);
   case ISD::SIGN_EXTEND_VECTOR_INREG: return visitSIGN_EXTEND_VECTOR_INREG(N);
-  case ISD::ZERO_EXTEND_VECTOR_INREG: return visitZERO_EXTEND_VECTOR_INREG(N);
   case ISD::TRUNCATE:           return visitTRUNCATE(N);
   case ISD::BITCAST:            return visitBITCAST(N);
   case ISD::BUILD_PAIR:         return visitBUILD_PAIR(N);
@@ -5724,8 +5722,7 @@ static SDNode *tryToFoldExtendOfConstant(SDNode *N, const TargetLowering &TLI,
   EVT VT = N->getValueType(0);
 
   assert((Opcode == ISD::SIGN_EXTEND || Opcode == ISD::ZERO_EXTEND ||
-         Opcode == ISD::ANY_EXTEND || Opcode == ISD::SIGN_EXTEND_VECTOR_INREG ||
-         Opcode == ISD::ZERO_EXTEND_VECTOR_INREG)
+         Opcode == ISD::ANY_EXTEND || Opcode == ISD::SIGN_EXTEND_VECTOR_INREG)
          && "Expected EXTEND dag node in input!");
 
   // fold (sext c1) -> c1
@@ -7003,20 +7000,6 @@ SDValue DAGCombiner::visitSIGN_EXTEND_VECTOR_INREG(SDNode *N) {
   return SDValue();
 }
 
-SDValue DAGCombiner::visitZERO_EXTEND_VECTOR_INREG(SDNode *N) {
-  SDValue N0 = N->getOperand(0);
-  EVT VT = N->getValueType(0);
-
-  if (N0.getOpcode() == ISD::UNDEF)
-    return DAG.getUNDEF(VT);
-
-  if (SDNode *Res = tryToFoldExtendOfConstant(N, TLI, DAG, LegalTypes,
-                                              LegalOperations))
-    return SDValue(Res, 0);
-
-  return SDValue();
-}
-
 SDValue DAGCombiner::visitTRUNCATE(SDNode *N) {
   SDValue N0 = N->getOperand(0);
   EVT VT = N->getValueType(0);