From 5349de1372dabab40691d348f2404da1e1478ef7 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 6 Oct 2007 06:08:17 +0000
Subject: [PATCH] revert evan's patch until the header is committed

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42686 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 55 ++----------------------
 1 file changed, 3 insertions(+), 52 deletions(-)

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index af4ee839811..7d697f11022 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -263,7 +263,6 @@ namespace {
     SDOperand visitLOAD(SDNode *N);
     SDOperand visitSTORE(SDNode *N);
     SDOperand visitINSERT_VECTOR_ELT(SDNode *N);
-    SDOperand visitEXTRACT_VECTOR_ELT(SDNode *N);
     SDOperand visitBUILD_VECTOR(SDNode *N);
     SDOperand visitCONCAT_VECTORS(SDNode *N);
     SDOperand visitVECTOR_SHUFFLE(SDNode *N);
@@ -683,7 +682,6 @@ SDOperand 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::EXTRACT_VECTOR_ELT: return visitEXTRACT_VECTOR_ELT(N);
   case ISD::BUILD_VECTOR:       return visitBUILD_VECTOR(N);
   case ISD::CONCAT_VECTORS:     return visitCONCAT_VECTORS(N);
   case ISD::VECTOR_SHUFFLE:     return visitVECTOR_SHUFFLE(N);
@@ -2909,8 +2907,9 @@ SDOperand DAGCombiner::visitBIT_CONVERT(SDNode *N) {
     return DAG.getNode(ISD::BIT_CONVERT, VT, N0.getOperand(0));
 
   // fold (conv (load x)) -> (load (conv*)x)
-  // If the resultant load doesn't need a higher alignment than the original!
-  if (ISD::isNormalLoad(N0.Val) && N0.hasOneUse() &&
+  // If the resultant load doesn't need a  higher alignment than the original!
+  if (ISD::isNON_EXTLoad(N0.Val) && N0.hasOneUse() &&
+      ISD::isUNINDEXEDLoad(N0.Val) &&
       TLI.isOperationLegal(ISD::LOAD, VT)) {
     LoadSDNode *LN0 = cast<LoadSDNode>(N0);
     unsigned Align = TLI.getTargetMachine().getTargetData()->
@@ -3902,54 +3901,6 @@ SDOperand DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
   return SDOperand();
 }
 
-SDOperand DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
-  SDOperand InVec = N->getOperand(0);
-  SDOperand EltNo = N->getOperand(1);
-
-  // (vextract (v4f32 s2v (f32 load $addr)), 0) -> (f32 load $addr)
-  // (vextract (v4i32 bc (v4f32 s2v (f32 load $addr))), 0) -> (i32 load $addr)
-  if (isa<ConstantSDNode>(EltNo)) {
-    unsigned Elt = cast<ConstantSDNode>(EltNo)->getValue();
-    bool NewLoad = false;
-    if (Elt == 0) {
-      MVT::ValueType VT = InVec.getValueType();
-      MVT::ValueType EVT = MVT::getVectorElementType(VT);
-      MVT::ValueType LVT = EVT;
-      unsigned NumElts = MVT::getVectorNumElements(VT);
-      if (InVec.getOpcode() == ISD::BIT_CONVERT) {
-        MVT::ValueType BCVT = InVec.getOperand(0).getValueType();
-        if (NumElts != MVT::getVectorNumElements(BCVT))
-          return SDOperand();
-        InVec = InVec.getOperand(0);
-        EVT = MVT::getVectorElementType(BCVT);
-        NewLoad = true;
-      }
-      if (InVec.getOpcode() == ISD::SCALAR_TO_VECTOR &&
-          InVec.getOperand(0).getValueType() == EVT &&
-          ISD::isNormalLoad(InVec.getOperand(0).Val) &&
-          InVec.getOperand(0).hasOneUse()) {
-        LoadSDNode *LN0 = cast<LoadSDNode>(InVec.getOperand(0));
-        unsigned Align = LN0->getAlignment();
-        if (NewLoad) {
-          // Check the resultant load doesn't need a higher alignment than the
-          // original load.
-          unsigned NewAlign = TLI.getTargetMachine().getTargetData()->
-            getABITypeAlignment(MVT::getTypeForValueType(LVT));
-          if (!TLI.isOperationLegal(ISD::LOAD, LVT) || NewAlign > Align)
-            return SDOperand();
-          Align = NewAlign;
-        }
-
-        return DAG.getLoad(LVT, LN0->getChain(), LN0->getBasePtr(),
-                           LN0->getSrcValue(), LN0->getSrcValueOffset(),
-                           LN0->isVolatile(), Align);
-      }
-    }
-  }
-  return SDOperand();
-}
-  
-
 SDOperand DAGCombiner::visitBUILD_VECTOR(SDNode *N) {
   unsigned NumInScalars = N->getNumOperands();
   MVT::ValueType VT = N->getValueType(0);