Revert "Recommit "[InlineCost] Use TTI to check if GEP is free." #2"

This reverts commit r292616 because the test case still has problem.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292618 91177308-0d34-0410-b5e6-96231b3b80d8

Author: Haicheng Wu

lib/Analysis/InlineCost.cpp

@@ -134,7 +134,6 @@ class CallAnalyzer : public InstVisitor<CallAnalyzer, bool> {
   void accumulateSROACost(DenseMap<Value *, int>::iterator CostIt,
                           int InstructionCost);
   bool isGEPOffsetConstant(GetElementPtrInst &GEP);
-  bool isGEPFree(GetElementPtrInst &GEP);
   bool accumulateGEPOffset(GEPOperator &GEP, APInt &Offset);
   bool simplifyCallSite(Function *F, CallSite CS);
   ConstantInt *stripAndComputeInBoundsConstantOffsets(Value *&V);
@@ -332,21 +331,6 @@ bool CallAnalyzer::accumulateGEPOffset(GEPOperator &GEP, APInt &Offset) {
   return true;
 }
 
-/// \brief Use TTI to check whether a GEP is free.
-///
-/// Respects any simplified values known during the analysis of this callsite.
-bool CallAnalyzer::isGEPFree(GetElementPtrInst &GEP) {
-  SmallVector<Value *, 4> Indices;
-  for (User::op_iterator I = GEP.idx_begin(), E = GEP.idx_end(); I != E; ++I)
-    if (Constant *SimpleOp = SimplifiedValues.lookup(*I))
-       Indices.push_back(SimpleOp);
-     else
-       Indices.push_back(*I);
-  return TargetTransformInfo::TCC_Free ==
-         TTI.getGEPCost(GEP.getSourceElementType(), GEP.getPointerOperand(),
-                        Indices);
-}
-
 bool CallAnalyzer::visitAlloca(AllocaInst &I) {
   // Check whether inlining will turn a dynamic alloca into a static
   // alloca and handle that case.
@@ -412,7 +396,7 @@ bool CallAnalyzer::visitGetElementPtr(GetElementPtrInst &I) {
         // Non-constant GEPs aren't folded, and disable SROA.
         if (SROACandidate)
           disableSROA(CostIt);
-        return isGEPFree(I);
+        return false;
       }
 
       // Add the result as a new mapping to Base + Offset.
@@ -438,7 +422,7 @@ bool CallAnalyzer::visitGetElementPtr(GetElementPtrInst &I) {
   // Variable GEPs will require math and will disable SROA.
   if (SROACandidate)
     disableSROA(CostIt);
-  return isGEPFree(I);
+  return false;
 }
 
 bool CallAnalyzer::visitBitCast(BitCastInst &I) {