[opaque pointer types] [NFC] GEP: replace get(Pointer)ElementType uses with get{Source,Result}ElementType.

Summary:
GEPOperator: provide getResultElementType alongside getSourceElementType.
This is made possible by adding a result element type field to GetElementPtrConstantExpr, which GetElementPtrInst already has.

GEP: replace get(Pointer)ElementType uses with get{Source,Result}ElementType.

Reviewers: mjacob, dblaikie

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D16275

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258145 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/Operator.h

@@ -401,6 +401,7 @@ public:
   }
 
   Type *getSourceElementType() const;
+  Type *getResultElementType() const;
 
   /// Method to return the address space of the pointer operand.
   unsigned getPointerAddressSpace() const {

lib/Analysis/BasicAliasAnalysis.cpp

@@ -381,7 +381,7 @@ static bool isObjectSize(const Value *V, uint64_t Size, const DataLayout &DL,
     }
 
     // Don't attempt to analyze GEPs over unsized objects.
-    if (!GEPOp->getOperand(0)->getType()->getPointerElementType()->isSized())
+    if (!GEPOp->getSourceElementType()->isSized())
       return V;
 
     unsigned AS = GEPOp->getPointerAddressSpace();

lib/Analysis/ScalarEvolution.cpp

@@ -4087,16 +4087,16 @@ const SCEV *ScalarEvolution::createNodeForSelectOrPHI(Instruction *I,
 /// operations. This allows them to be analyzed by regular SCEV code.
 ///
 const SCEV *ScalarEvolution::createNodeForGEP(GEPOperator *GEP) {
-  Value *Base = GEP->getOperand(0);
   // Don't attempt to analyze GEPs over unsized objects.
-  if (!Base->getType()->getPointerElementType()->isSized())
+  if (!GEP->getSourceElementType()->isSized())
     return getUnknown(GEP);
 
   SmallVector<const SCEV *, 4> IndexExprs;
   for (auto Index = GEP->idx_begin(); Index != GEP->idx_end(); ++Index)
     IndexExprs.push_back(getSCEV(*Index));
-  return getGEPExpr(GEP->getSourceElementType(), getSCEV(Base), IndexExprs,
-                    GEP->isInBounds());
+  return getGEPExpr(GEP->getSourceElementType(),
+                    getSCEV(GEP->getPointerOperand()),
+                    IndexExprs, GEP->isInBounds());
 }
 
 /// GetMinTrailingZeros - Determine the minimum number of zero bits that S is

lib/Analysis/ValueTracking.cpp

@@ -2886,8 +2886,7 @@ bool llvm::getConstantStringInfo(const Value *V, StringRef &Str,
       return false;
 
     // Make sure the index-ee is a pointer to array of i8.
-    PointerType *PT = cast<PointerType>(GEP->getOperand(0)->getType());
-    ArrayType *AT = dyn_cast<ArrayType>(PT->getElementType());
+    ArrayType *AT = dyn_cast<ArrayType>(GEP->getSourceElementType());
     if (!AT || !AT->getElementType()->isIntegerTy(8))
       return false;
 
@@ -3253,8 +3252,7 @@ static bool isDereferenceableAndAlignedPointer(
 
   // For GEPs, determine if the indexing lands within the allocated object.
   if (const GEPOperator *GEP = dyn_cast<GEPOperator>(V)) {
-    Type *VTy = GEP->getType();
-    Type *Ty = VTy->getPointerElementType();
+    Type *Ty = GEP->getResultElementType();
     const Value *Base = GEP->getPointerOperand();
 
     // Conservatively require that the base pointer be fully dereferenceable
@@ -3265,14 +3263,14 @@ static bool isDereferenceableAndAlignedPointer(
                                             Visited))
       return false;
 
-    APInt Offset(DL.getPointerTypeSizeInBits(VTy), 0);
+    APInt Offset(DL.getPointerTypeSizeInBits(GEP->getType()), 0);
     if (!GEP->accumulateConstantOffset(DL, Offset))
       return false;
 
     // Check if the load is within the bounds of the underlying object
     // and offset is aligned.
     uint64_t LoadSize = DL.getTypeStoreSize(Ty);
-    Type *BaseType = Base->getType()->getPointerElementType();
+    Type *BaseType = GEP->getSourceElementType();
     assert(isPowerOf2_32(Align) && "must be a power of 2!");
     return (Offset + LoadSize).ule(DL.getTypeAllocSize(BaseType)) && 
            !(Offset & APInt(Offset.getBitWidth(), Align-1));

lib/Analysis/VectorUtils.cpp

@@ -231,8 +231,7 @@ Intrinsic::ID llvm::getIntrinsicIDForCall(CallInst *CI,
 unsigned llvm::getGEPInductionOperand(const GetElementPtrInst *Gep) {
   const DataLayout &DL = Gep->getModule()->getDataLayout();
   unsigned LastOperand = Gep->getNumOperands() - 1;
-  unsigned GEPAllocSize = DL.getTypeAllocSize(
-      cast<PointerType>(Gep->getType()->getScalarType())->getElementType());
+  unsigned GEPAllocSize = DL.getTypeAllocSize(Gep->getResultElementType());
 
   // Walk backwards and try to peel off zeros.
   while (LastOperand > 1 && match(Gep->getOperand(LastOperand), m_Zero())) {

lib/CodeGen/SelectionDAG/FastISel.cpp

@@ -513,7 +513,13 @@ bool FastISel::selectGetElementPtr(const User *I) {
       }
       Ty = StTy->getElementType(Field);
     } else {
-      Ty = cast<SequentialType>(Ty)->getElementType();
+      if (Ty->isPointerTy()) {
+        // The only pointer type is for the very first index,
+        // therefore the next type is the source element type.
+        Ty = cast<GEPOperator>(I)->getSourceElementType();
+      } else {
+        Ty = cast<SequentialType>(Ty)->getElementType();
+      }
 
       // If this is a constant subscript, handle it quickly.
       if (const auto *CI = dyn_cast<ConstantInt>(Idx)) {

lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -3018,7 +3018,14 @@ void SelectionDAGBuilder::visitGetElementPtr(const User &I) {
 
       Ty = StTy->getElementType(Field);
     } else {
-      Ty = cast<SequentialType>(Ty)->getElementType();
+      if (Ty->isPointerTy()) {
+        // The only pointer type is for the very first index,
+        // therefore the next type is the source element type.
+        Ty = cast<GEPOperator>(&I)->getSourceElementType();
+      } else {
+        Ty = cast<SequentialType>(Ty)->getElementType();
+      }
+
       MVT PtrTy =
           DAG.getTargetLoweringInfo().getPointerTy(DAG.getDataLayout(), AS);
       unsigned PtrSize = PtrTy.getSizeInBits();

lib/IR/ConstantFold.cpp

@@ -2041,7 +2041,7 @@ static Constant *ConstantFoldGetElementPtrImpl(Type *PointeeTy, Constant *C,
 
   if (isa<UndefValue>(C)) {
     PointerType *PtrTy = cast<PointerType>(C->getType()->getScalarType());
-    Type *Ty = GetElementPtrInst::getIndexedType(PtrTy->getElementType(), Idxs);
+    Type *Ty = GetElementPtrInst::getIndexedType(PointeeTy, Idxs);
     assert(Ty && "Invalid indices for GEP!");
     Type *GEPTy = PointerType::get(Ty, PtrTy->getAddressSpace());
     if (VectorType *VT = dyn_cast<VectorType>(C->getType()))
@@ -2058,8 +2058,8 @@ static Constant *ConstantFoldGetElementPtrImpl(Type *PointeeTy, Constant *C,
       }
     if (isNull) {
       PointerType *PtrTy = cast<PointerType>(C->getType()->getScalarType());
-      Type *Ty =
-          GetElementPtrInst::getIndexedType(PtrTy->getElementType(), Idxs);
+      Type *Ty = GetElementPtrInst::getIndexedType(PointeeTy, Idxs);
+
       assert(Ty && "Invalid indices for GEP!");
       Type *GEPTy = PointerType::get(Ty, PtrTy->getAddressSpace());
       if (VectorType *VT = dyn_cast<VectorType>(C->getType()))
@@ -2241,22 +2241,6 @@ static Constant *ConstantFoldGetElementPtrImpl(Type *PointeeTy, Constant *C,
   return nullptr;
 }
 
-Constant *llvm::ConstantFoldGetElementPtr(Constant *C,
-                                          bool inBounds,
-                                          ArrayRef<Constant *> Idxs) {
-  return ConstantFoldGetElementPtrImpl(
-      cast<PointerType>(C->getType()->getScalarType())->getElementType(), C,
-      inBounds, Idxs);
-}
-
-Constant *llvm::ConstantFoldGetElementPtr(Constant *C,
-                                          bool inBounds,
-                                          ArrayRef<Value *> Idxs) {
-  return ConstantFoldGetElementPtrImpl(
-      cast<PointerType>(C->getType()->getScalarType())->getElementType(), C,
-      inBounds, Idxs);
-}
-
 Constant *llvm::ConstantFoldGetElementPtr(Type *Ty, Constant *C,
                                           bool inBounds,
                                           ArrayRef<Constant *> Idxs) {

lib/IR/ConstantFold.h

@@ -47,10 +47,6 @@ namespace llvm {
                                           Constant *V2);
   Constant *ConstantFoldCompareInstruction(unsigned short predicate, 
                                            Constant *C1, Constant *C2);
-  Constant *ConstantFoldGetElementPtr(Constant *C, bool inBounds,
-                                      ArrayRef<Constant *> Idxs);
-  Constant *ConstantFoldGetElementPtr(Constant *C, bool inBounds,
-                                      ArrayRef<Value *> Idxs);
   Constant *ConstantFoldGetElementPtr(Type *Ty, Constant *C, bool inBounds,
                                       ArrayRef<Constant *> Idxs);
   Constant *ConstantFoldGetElementPtr(Type *Ty, Constant *C, bool inBounds,

lib/IR/Constants.cpp

@@ -2335,7 +2335,8 @@ GetElementPtrConstantExpr::GetElementPtrConstantExpr(
                    OperandTraits<GetElementPtrConstantExpr>::op_end(this) -
                        (IdxList.size() + 1),
                    IdxList.size() + 1),
-      SrcElementTy(SrcElementTy) {
+      SrcElementTy(SrcElementTy),
+      ResElementTy(GetElementPtrInst::getIndexedType(SrcElementTy, IdxList)) {
   Op<0>() = C;
   Use *OperandList = getOperandList();
   for (unsigned i = 0, E = IdxList.size(); i != E; ++i)
@@ -2346,6 +2347,10 @@ Type *GetElementPtrConstantExpr::getSourceElementType() const {
   return SrcElementTy;
 }
 
+Type *GetElementPtrConstantExpr::getResultElementType() const {
+  return ResElementTy;
+}
+
 //===----------------------------------------------------------------------===//
 //                       ConstantData* implementations
 

lib/IR/ConstantsContext.h

@@ -225,19 +225,12 @@ public:
 /// used behind the scenes to implement getelementpr constant exprs.
 class GetElementPtrConstantExpr : public ConstantExpr {
   Type *SrcElementTy;
+  Type *ResElementTy;
   void anchor() override;
   GetElementPtrConstantExpr(Type *SrcElementTy, Constant *C,
                             ArrayRef<Constant *> IdxList, Type *DestTy);
 
 public:
-  static GetElementPtrConstantExpr *Create(Constant *C,
-                                           ArrayRef<Constant*> IdxList,
-                                           Type *DestTy,
-                                           unsigned Flags) {
-    return Create(
-        cast<PointerType>(C->getType()->getScalarType())->getElementType(), C,
-        IdxList, DestTy, Flags);
-  }
   static GetElementPtrConstantExpr *Create(Type *SrcElementTy, Constant *C,
                                            ArrayRef<Constant *> IdxList,
                                            Type *DestTy, unsigned Flags) {
@@ -247,6 +240,7 @@ public:
     return Result;
   }
   Type *getSourceElementType() const;
+  Type *getResultElementType() const;
   /// Transparently provide more efficient getOperand methods.
   DECLARE_TRANSPARENT_OPERAND_ACCESSORS(Value);
 

lib/IR/Operator.cpp

@@ -12,6 +12,12 @@ Type *GEPOperator::getSourceElementType() const {
   return cast<GetElementPtrConstantExpr>(this)->getSourceElementType();
 }
 
+Type *GEPOperator::getResultElementType() const {
+  if (auto *I = dyn_cast<GetElementPtrInst>(this))
+    return I->getResultElementType();
+  return cast<GetElementPtrConstantExpr>(this)->getResultElementType();
+}
+
 bool GEPOperator::accumulateConstantOffset(const DataLayout &DL,
                                            APInt &Offset) const {
   assert(Offset.getBitWidth() ==

lib/Target/AArch64/AArch64FastISel.cpp

@@ -4825,7 +4825,13 @@ bool AArch64FastISel::selectGetElementPtr(const Instruction *I) {
         TotalOffs += DL.getStructLayout(StTy)->getElementOffset(Field);
       Ty = StTy->getElementType(Field);
     } else {
-      Ty = cast<SequentialType>(Ty)->getElementType();
+      if (Ty->isPointerTy()) {
+        // The only pointer type is for the very first index,
+        // therefore the next type is the source element type.
+        Ty = cast<GEPOperator>(I)->getSourceElementType();
+      } else {
+        Ty = cast<SequentialType>(Ty)->getElementType();
+      }
       // If this is a constant subscript, handle it quickly.
       if (const auto *CI = dyn_cast<ConstantInt>(Idx)) {
         if (CI->isZero())

lib/Transforms/IPO/GlobalOpt.cpp

@@ -329,7 +329,7 @@ static bool CleanupConstantGlobalUsers(Value *V, Constant *Init,
         // we already know what the result of any load from that GEP is.
         // TODO: Handle splats.
         if (Init && isa<ConstantAggregateZero>(Init) && GEP->isInBounds())
-          SubInit = Constant::getNullValue(GEP->getType()->getElementType());
+          SubInit = Constant::getNullValue(GEP->getResultElementType());
       }
       Changed |= CleanupConstantGlobalUsers(GEP, SubInit, DL, TLI);
 

lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp

@@ -694,10 +694,8 @@ static bool canReplaceGEPIdxWithZero(InstCombiner &IC, GetElementPtrInst *GEPI,
     return false;
 
   SmallVector<Value *, 4> Ops(GEPI->idx_begin(), GEPI->idx_begin() + Idx);
-  Type *AllocTy = GetElementPtrInst::getIndexedType(
-      cast<PointerType>(GEPI->getOperand(0)->getType()->getScalarType())
-          ->getElementType(),
-      Ops);
+  Type *AllocTy =
+    GetElementPtrInst::getIndexedType(GEPI->getSourceElementType(), Ops);
   if (!AllocTy || !AllocTy->isSized())
     return false;
   const DataLayout &DL = IC.getDataLayout();

lib/Transforms/InstCombine/InstructionCombining.cpp

@@ -1349,19 +1349,18 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
   for (User::op_iterator I = GEP.op_begin() + 1, E = GEP.op_end(); I != E;
        ++I, ++GTI) {
     // Skip indices into struct types.
-    SequentialType *SeqTy = dyn_cast<SequentialType>(*GTI);
-    if (!SeqTy)
+    if (isa<StructType>(*GTI))
       continue;
 
     // Index type should have the same width as IntPtr
     Type *IndexTy = (*I)->getType();
     Type *NewIndexType = IndexTy->isVectorTy() ?
       VectorType::get(IntPtrTy, IndexTy->getVectorNumElements()) : IntPtrTy;
- 
+
     // If the element type has zero size then any index over it is equivalent
     // to an index of zero, so replace it with zero if it is not zero already.
-    if (SeqTy->getElementType()->isSized() &&
-        DL.getTypeAllocSize(SeqTy->getElementType()) == 0)
+    Type *EltTy = GTI.getIndexedType();
+    if (EltTy->isSized() && DL.getTypeAllocSize(EltTy) == 0)
       if (!isa<Constant>(*I) || !cast<Constant>(*I)->isNullValue()) {
         *I = Constant::getNullValue(NewIndexType);
         MadeChange = true;
@@ -1405,7 +1404,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
         return nullptr;
 
       // Keep track of the type as we walk the GEP.
-      Type *CurTy = Op1->getOperand(0)->getType()->getScalarType();
+      Type *CurTy = nullptr;
 
       for (unsigned J = 0, F = Op1->getNumOperands(); J != F; ++J) {
         if (Op1->getOperand(J)->getType() != Op2->getOperand(J)->getType())
@@ -1436,7 +1435,9 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
 
         // Sink down a layer of the type for the next iteration.
         if (J > 0) {
-          if (CompositeType *CT = dyn_cast<CompositeType>(CurTy)) {
+          if (J == 1) {
+            CurTy = Op1->getSourceElementType();
+          } else if (CompositeType *CT = dyn_cast<CompositeType>(CurTy)) {
             CurTy = CT->getTypeAtIndex(Op1->getOperand(J));
           } else {
             CurTy = nullptr;
@@ -1565,8 +1566,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
     unsigned AS = GEP.getPointerAddressSpace();
     if (GEP.getOperand(1)->getType()->getScalarSizeInBits() ==
         DL.getPointerSizeInBits(AS)) {
-      Type *PtrTy = GEP.getPointerOperandType();
-      Type *Ty = PtrTy->getPointerElementType();
+      Type *Ty = GEP.getSourceElementType();
       uint64_t TyAllocSize = DL.getTypeAllocSize(Ty);
 
       bool Matched = false;
@@ -1629,9 +1629,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
     //
     // This occurs when the program declares an array extern like "int X[];"
     if (HasZeroPointerIndex) {
-      PointerType *CPTy = cast<PointerType>(PtrOp->getType());
       if (ArrayType *CATy =
-          dyn_cast<ArrayType>(CPTy->getElementType())) {
+          dyn_cast<ArrayType>(GEP.getSourceElementType())) {
         // GEP (bitcast i8* X to [0 x i8]*), i32 0, ... ?
         if (CATy->getElementType() == StrippedPtrTy->getElementType()) {
           // -> GEP i8* X, ...
@@ -1688,7 +1687,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
       // %t = getelementptr i32* bitcast ([2 x i32]* %str to i32*), i32 %V
       // into:  %t1 = getelementptr [2 x i32]* %str, i32 0, i32 %V; bitcast
       Type *SrcElTy = StrippedPtrTy->getElementType();
-      Type *ResElTy = PtrOp->getType()->getPointerElementType();
+      Type *ResElTy = GEP.getSourceElementType();
       if (SrcElTy->isArrayTy() &&
           DL.getTypeAllocSize(SrcElTy->getArrayElementType()) ==
               DL.getTypeAllocSize(ResElTy)) {

lib/Transforms/Scalar/NaryReassociate.cpp

@@ -335,7 +335,7 @@ static bool isGEPFoldable(GetElementPtrInst *GEP,
   }
 
   unsigned AddrSpace = GEP->getPointerAddressSpace();
-  return TTI->isLegalAddressingMode(GEP->getType()->getElementType(), BaseGV,
+  return TTI->isLegalAddressingMode(GEP->getResultElementType(), BaseGV,
                                     BaseOffset, HasBaseReg, Scale, AddrSpace);
 }
 
@@ -434,7 +434,7 @@ GetElementPtrInst *NaryReassociate::tryReassociateGEPAtIndex(
 
   // NewGEP = (char *)Candidate + RHS * sizeof(IndexedType)
   uint64_t IndexedSize = DL->getTypeAllocSize(IndexedType);
-  Type *ElementType = GEP->getType()->getElementType();
+  Type *ElementType = GEP->getResultElementType();
   uint64_t ElementSize = DL->getTypeAllocSize(ElementType);
   // Another less rare case: because I is not necessarily the last index of the
   // GEP, the size of the type at the I-th index (IndexedSize) is not

lib/Transforms/Scalar/RewriteStatepointsForGC.cpp

@@ -2108,7 +2108,7 @@ chainToBasePointerCost(SmallVectorImpl<Instruction*> &Chain,
 
     } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Instr)) {
       // Cost of the address calculation
-      Type *ValTy = GEP->getPointerOperandType()->getPointerElementType();
+      Type *ValTy = GEP->getSourceElementType();
       Cost += TTI.getAddressComputationCost(ValTy);
 
       // And cost of the GEP itself

lib/Transforms/Scalar/ScalarReplAggregates.cpp

@@ -510,15 +510,11 @@ bool ConvertToScalarInfo::CanConvertToScalar(Value *V, uint64_t Offset,
 
     if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(UI)) {
       // If this is a GEP with a variable indices, we can't handle it.
-      PointerType* PtrTy = dyn_cast<PointerType>(GEP->getPointerOperandType());
-      if (!PtrTy)
-        return false;
-
       // Compute the offset that this GEP adds to the pointer.
       SmallVector<Value*, 8> Indices(GEP->op_begin()+1, GEP->op_end());
       Value *GEPNonConstantIdx = nullptr;
       if (!GEP->hasAllConstantIndices()) {
-        if (!isa<VectorType>(PtrTy->getElementType()))
+        if (!isa<VectorType>(GEP->getSourceElementType()))
           return false;
         if (NonConstantIdx)
           return false;
@@ -528,7 +524,7 @@ bool ConvertToScalarInfo::CanConvertToScalar(Value *V, uint64_t Offset,
         HadDynamicAccess = true;
       } else
         GEPNonConstantIdx = NonConstantIdx;
-      uint64_t GEPOffset = DL.getIndexedOffset(PtrTy,
+      uint64_t GEPOffset = DL.getIndexedOffset(GEP->getPointerOperandType(),
                                                Indices);
       // See if all uses can be converted.
       if (!CanConvertToScalar(GEP, Offset+GEPOffset, GEPNonConstantIdx))

lib/Transforms/Scalar/SeparateConstOffsetFromGEP.cpp

@@ -911,7 +911,7 @@ bool SeparateConstOffsetFromGEP::splitGEP(GetElementPtrInst *GEP) {
         getAnalysis<TargetTransformInfoWrapperPass>().getTTI(
             *GEP->getParent()->getParent());
     unsigned AddrSpace = GEP->getPointerAddressSpace();
-    if (!TTI.isLegalAddressingMode(GEP->getType()->getElementType(),
+    if (!TTI.isLegalAddressingMode(GEP->getResultElementType(),
                                    /*BaseGV=*/nullptr, AccumulativeByteOffset,
                                    /*HasBaseReg=*/true, /*Scale=*/0,
                                    AddrSpace)) {
@@ -1018,7 +1018,7 @@ bool SeparateConstOffsetFromGEP::splitGEP(GetElementPtrInst *GEP) {
   // unsigned.. Therefore, we cast ElementTypeSizeOfGEP to signed because it is
   // used with unsigned integers later.
   int64_t ElementTypeSizeOfGEP = static_cast<int64_t>(
-      DL->getTypeAllocSize(GEP->getType()->getElementType()));
+      DL->getTypeAllocSize(GEP->getResultElementType()));
   Type *IntPtrTy = DL->getIntPtrType(GEP->getType());
   if (AccumulativeByteOffset % ElementTypeSizeOfGEP == 0) {
     // Very likely. As long as %gep is natually aligned, the byte offset we

lib/Transforms/Scalar/StraightLineStrengthReduce.cpp

@@ -270,7 +270,7 @@ static bool isGEPFoldable(GetElementPtrInst *GEP,
   }
 
   unsigned AddrSpace = GEP->getPointerAddressSpace();
-  return TTI->isLegalAddressingMode(GEP->getType()->getElementType(), BaseGV,
+  return TTI->isLegalAddressingMode(GEP->getResultElementType(), BaseGV,
                                     BaseOffset, HasBaseReg, Scale, AddrSpace);
 }
 
@@ -566,8 +566,7 @@ Value *StraightLineStrengthReduce::emitBump(const Candidate &Basis,
   if (Basis.CandidateKind == Candidate::GEP) {
     APInt ElementSize(
         IndexOffset.getBitWidth(),
-        DL->getTypeAllocSize(
-            cast<GetElementPtrInst>(Basis.Ins)->getType()->getElementType()));
+        DL->getTypeAllocSize(cast<GetElementPtrInst>(Basis.Ins)->getResultElementType()));
     APInt Q, R;
     APInt::sdivrem(IndexOffset, ElementSize, Q, R);
     if (R.getSExtValue() == 0)