[SVE] Remove calls to VectorType::getNumElements from InstCombine

[ctetreau]

catch stragglers

[ctetreau]

rebase

[ctetreau]

rebase

[ctetreau]

rebase, catch stragglers

[ctetreau]

rebase

[ctetreau]

rebase

[ctetreau]

fix test

[ctetreau]

fix test

[ctetreau]

llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp

184–185

These changes are covered by test Transforms/InstCombine/vscale_extractelement.ll, and isn't really a behavior change since it Min is used in exactly the same way as the numElements was before. The Min is not used for iteration, so this should be safe.

1996

This behavioral change is covered by test Transforms/InstCombine/vscale_extractelement.ll.

[ctetreau]

adapt to D86065

[ctetreau]

clang-format

[ctetreau]

ping?

[efriedma]

LGTM with one minor change.

llvm/include/llvm/Transforms/InstCombine/InstCombiner.h

338 ↗

(On Diff #288668)

Change the initialization of InVTy? There's no reason to do the cast<> in two stages.

[ctetreau]

address code review issues

[ctetreau]

fix cast

llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp

 /// Return true if a constant shift amount is always less than the specified
 /// bit-width. If not, the shift could create poison in the narrower type.
 static bool canNarrowShiftAmt(Constant *C, unsigned BitWidth) {
   if (auto *ScalarC = dyn_cast<ConstantInt>(C))
     return ScalarC->getZExtValue() < BitWidth;
 
   if (C->getType()->isVectorTy()) {
     // Check each element of a constant vector.
-    unsigned NumElts = cast<VectorType>(C->getType())->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(C->getType())->getNumElements();
     for (unsigned i = 0; i != NumElts; ++i) {
       Constant *Elt = C->getAggregateElement(i);
       if (!Elt)
         return false;
       if (isa<UndefValue>(Elt))
         continue;
       auto *CI = dyn_cast<ConstantInt>(Elt);
       if (!CI || CI->getZExtValue() >= BitWidth)
if (match(LowerSrc, m_BitReverse(m_Value(LowerBRev))) &&
       match(UpperSrc, m_BitReverse(m_Value(UpperBRev))))
     return ConcatIntrinsicCalls(Intrinsic::bitreverse, UpperBRev, LowerBRev);
 
   return nullptr;
 }
 
 /// If all elements of two constant vectors are 0/-1 and inverses, return true.
 static bool areInverseVectorBitmasks(Constant *C1, Constant *C2) {
-  unsigned NumElts = cast<VectorType>(C1->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(C1->getType())->getNumElements();
   for (unsigned i = 0; i != NumElts; ++i) {
     Constant *EltC1 = C1->getAggregateElement(i);
     Constant *EltC2 = C2->getAggregateElement(i);
     if (!EltC1 || !EltC2)
       return false;
 
     // One element must be all ones, and the other must be all zeros.
     if (!((match(EltC1, m_Zero()) && match(EltC2, m_AllOnes())) ||

llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp

 /// as it's actually a byte reverse.
 static Value *simplifyNeonTbl1(const IntrinsicInst &II,
                                InstCombiner::BuilderTy &Builder) {
   // Bail out if the mask is not a constant.
   auto *C = dyn_cast<Constant>(II.getArgOperand(1));
   if (!C)
     return nullptr;
 
-  auto *VecTy = cast<VectorType>(II.getType());
+  auto *VecTy = cast<FixedVectorType>(II.getType());
   unsigned NumElts = VecTy->getNumElements();
 
   // Only perform this transformation for <8 x i8> vector types.
   if (!VecTy->getElementType()->isIntegerTy(8) || NumElts != 8)
     return nullptr;
 
   int Indexes[8];
 

llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp

Instruction *InstCombinerImpl::visitTrunc(TruncInst &Trunc) {
   // extractelement.
   //
   // Example (little endian):
   //   trunc (extractelement <4 x i64> %X, 0) to i32
   //   --->
   //   extractelement <8 x i32> (bitcast <4 x i64> %X to <8 x i32>), i32 0
   Value *VecOp;
   if (match(Src, m_OneUse(m_ExtractElt(m_Value(VecOp), m_ConstantInt(Cst))))) {
-    auto *VecOpTy = cast<VectorType>(VecOp->getType());
+    auto *VecOpTy = cast<FixedVectorType>(VecOp->getType());
     unsigned VecNumElts = VecOpTy->getNumElements();
 
     // A badly fit destination size would result in an invalid cast.
     if (SrcWidth % DestWidth == 0) {
       uint64_t TruncRatio = SrcWidth / DestWidth;
       uint64_t BitCastNumElts = VecNumElts * TruncRatio;
       uint64_t VecOpIdx = Cst->getZExtValue();
       uint64_t NewIdx = DL.isBigEndian() ? (VecOpIdx + 1) * TruncRatio - 1

 static Type *shrinkFPConstantVector(Value *V) {
   auto *CV = dyn_cast<Constant>(V);
   auto *CVVTy = dyn_cast<VectorType>(V->getType());
   if (!CV || !CVVTy)
     return nullptr;
 
   Type *MinType = nullptr;
 
-  unsigned NumElts = CVVTy->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(CVVTy)->getNumElements();
   for (unsigned i = 0; i != NumElts; ++i) {
     auto *CFP = dyn_cast_or_null<ConstantFP>(CV->getAggregateElement(i));
     if (!CFP)
       return nullptr;
 
     Type *T = shrinkFPConstant(CFP);
     if (!T)
       return nullptr;
Instruction *InstCombinerImpl::visitPtrToInt(PtrToIntInst &CI) {
 
   if (Ty->getScalarSizeInBits() == DL.getPointerSizeInBits(AS))
     return commonPointerCastTransforms(CI);
 
   Type *PtrTy = DL.getIntPtrType(CI.getContext(), AS);
   if (auto *VTy = dyn_cast<VectorType>(Ty)) {
     // Handle vectors of pointers.
     // FIXME: what should happen for scalable vectors?
-    PtrTy = FixedVectorType::get(PtrTy, VTy->getNumElements());
+    PtrTy = FixedVectorType::get(PtrTy,
+                                 cast<FixedVectorType>(VTy)->getNumElements());
   }
 
   Value *P = Builder.CreatePtrToInt(CI.getOperand(0), PtrTy);
   return CastInst::CreateIntegerCast(P, Ty, /*isSigned=*/false);
 }
 
 /// This input value (which is known to have vector type) is being zero extended
 /// or truncated to the specified vector type. Since the zext/trunc is done
if (SrcTy->getElementType() != DestTy->getElementType()) {
     // same size.  There is no specific reason we couldn't handle things like
     // <4 x i16> -> <4 x i32> by bitcasting to <2 x i32> but haven't gotten
     // there yet.
     if (SrcTy->getElementType()->getPrimitiveSizeInBits() !=
         DestTy->getElementType()->getPrimitiveSizeInBits())
       return nullptr;
 
     SrcTy =
-        FixedVectorType::get(DestTy->getElementType(), SrcTy->getNumElements());
+        FixedVectorType::get(DestTy->getElementType(),
+                             cast<FixedVectorType>(SrcTy)->getNumElements());
     InVal = IC.Builder.CreateBitCast(InVal, SrcTy);
   }
 
   bool IsBigEndian = IC.getDataLayout().isBigEndian();
-  unsigned SrcElts = SrcTy->getNumElements();
-  unsigned DestElts = DestTy->getNumElements();
+  unsigned SrcElts = cast<FixedVectorType>(SrcTy)->getNumElements();
+  unsigned DestElts = cast<FixedVectorType>(DestTy)->getNumElements();
 
   assert(SrcElts != DestElts && "Element counts should be different.");
 
   // Now that the element types match, get the shuffle mask and RHS of the
   // shuffle to use, which depends on whether we're increasing or decreasing the
   // size of the input.
   SmallVector<int, 16> ShuffleMaskStorage;
   ArrayRef<int> ShuffleMask;

 ///    %tmp32 = zext i32 %tmp31 to i64
 ///    %tmp33 = shl i64 %tmp32, 32
 ///    %ins35 = or i64 %tmp33, %tmp38
 ///    %tmp43 = bitcast i64 %ins35 to <2 x float>
 ///
 /// Into two insertelements that do "buildvector{%inc, %inc5}".
 static Value *optimizeIntegerToVectorInsertions(BitCastInst &CI,
                                                 InstCombinerImpl &IC) {
-  VectorType *DestVecTy = cast<VectorType>(CI.getType());
+  auto *DestVecTy = cast<FixedVectorType>(CI.getType());
   Value *IntInput = CI.getOperand(0);
 
   SmallVector<Value*, 8> Elements(DestVecTy->getNumElements());
   if (!collectInsertionElements(IntInput, 0, Elements,
                                 DestVecTy->getElementType(),
                                 IC.getDataLayout().isBigEndian()))
     return nullptr;
 
if (!ExtElt || !ExtElt->hasOneUse())
     return nullptr;
 
   // The bitcast must be to a vectorizable type, otherwise we can't make a new
   // type to extract from.
   Type *DestType = BitCast.getType();
   if (!VectorType::isValidElementType(DestType))
     return nullptr;
 
-  unsigned NumElts = ExtElt->getVectorOperandType()->getNumElements();
+  unsigned NumElts =
+      cast<FixedVectorType>(ExtElt->getVectorOperandType())->getNumElements();
   auto *NewVecType = FixedVectorType::get(DestType, NumElts);
   auto *NewBC = IC.Builder.CreateBitCast(ExtElt->getVectorOperand(),
                                          NewVecType, "bc");
   return ExtractElementInst::Create(NewBC, ExtElt->getIndexOperand());
 }
 
 /// Change the type of a bitwise logic operation if we can eliminate a bitcast.
 static Instruction *foldBitCastBitwiseLogic(BitCastInst &BitCast,
if (!match(BitCast.getOperand(0),
     return nullptr;
 
   // A vector select must maintain the same number of elements in its operands.
   Type *CondTy = Cond->getType();
   Type *DestTy = BitCast.getType();
   if (auto *CondVTy = dyn_cast<VectorType>(CondTy)) {
     if (!DestTy->isVectorTy())
       return nullptr;
-    if (cast<VectorType>(DestTy)->getNumElements() != CondVTy->getNumElements())
+    if (cast<FixedVectorType>(DestTy)->getNumElements() !=
+        cast<FixedVectorType>(CondVTy)->getNumElements())
       return nullptr;
   }
 
   // FIXME: This transform is restricted from changing the select between
   // scalars and vectors to avoid backend problems caused by creating
   // potentially illegal operations. If a fix-up is added to handle that
   // situation, we can remove this check.
   if (DestTy->isVectorTy() != TVal->getType()->isVectorTy())
if (FixedVectorType *SrcVTy = dyn_cast<FixedVectorType>(SrcTy)) {
     }
   }
 
   if (auto *Shuf = dyn_cast<ShuffleVectorInst>(Src)) {
     // Okay, we have (bitcast (shuffle ..)).  Check to see if this is
     // a bitcast to a vector with the same # elts.
     Value *ShufOp0 = Shuf->getOperand(0);
     Value *ShufOp1 = Shuf->getOperand(1);
-    unsigned NumShufElts = Shuf->getType()->getNumElements();
+    unsigned NumShufElts =
+        cast<FixedVectorType>(Shuf->getType())->getNumElements();
     unsigned NumSrcVecElts =
-        cast<VectorType>(ShufOp0->getType())->getNumElements();
+        cast<FixedVectorType>(ShufOp0->getType())->getNumElements();
     if (Shuf->hasOneUse() && DestTy->isVectorTy() &&
-        cast<VectorType>(DestTy)->getNumElements() == NumShufElts &&
+        cast<FixedVectorType>(DestTy)->getNumElements() == NumShufElts &&
         NumShufElts == NumSrcVecElts) {
       BitCastInst *Tmp;
       // If either of the operands is a cast from CI.getType(), then
       // evaluating the shuffle in the casted destination's type will allow
       // us to eliminate at least one cast.
       if (((Tmp = dyn_cast<BitCastInst>(ShufOp0)) &&
            Tmp->getOperand(0)->getType() == DestTy) ||
           ((Tmp = dyn_cast<BitCastInst>(ShufOp1)) &&
Instruction *InstCombinerImpl::visitAddrSpaceCast(AddrSpaceCastInst &CI) {
   PointerType *DestTy = cast<PointerType>(CI.getType()->getScalarType());
 
   Type *DestElemTy = DestTy->getElementType();
   if (SrcTy->getElementType() != DestElemTy) {
     Type *MidTy = PointerType::get(DestElemTy, SrcTy->getAddressSpace());
     if (VectorType *VT = dyn_cast<VectorType>(CI.getType())) {
       // Handle vectors of pointers.
       // FIXME: what should happen for scalable vectors?
-      MidTy = FixedVectorType::get(MidTy, VT->getNumElements());
+      MidTy = FixedVectorType::get(MidTy,
+                                   cast<FixedVectorType>(VT)->getNumElements());
     }
 
     Value *NewBitCast = Builder.CreateBitCast(Src, MidTy);
     return new AddrSpaceCastInst(NewBitCast, CI.getType());
   }
 
   return commonPointerCastTransforms(CI);
 }

llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp

if (GEPLHS->isInBounds() && ICmpInst::isEquality(Cond) &&
     //
     // In general, we're allowed to make values less poison (i.e. remove
     //   sources of full UB), so in this case, we just select between the two
     //   non-poison cases (1 and 4 above).
     //
     // For vectors, we apply the same reasoning on a per-lane basis.
     auto *Base = GEPLHS->getPointerOperand();
     if (GEPLHS->getType()->isVectorTy() && Base->getType()->isPointerTy()) {
-      int NumElts = cast<VectorType>(GEPLHS->getType())->getNumElements();
+      int NumElts = cast<FixedVectorType>(GEPLHS->getType())->getNumElements();
       Base = Builder.CreateVectorSplat(NumElts, Base);
     }
     return new ICmpInst(Cond, Base,
                         ConstantExpr::getPointerBitCastOrAddrSpaceCast(
                             cast<Constant>(RHS), Base->getType()));
   } else if (GEPOperator *GEPRHS = dyn_cast<GEPOperator>(RHS)) {
     // If the base pointers are different, but the indices are the same, just
     // compare the base pointer.
Instruction *InstCombinerImpl::foldICmpAndConstant(ICmpInst &Cmp,
   // (X & C2) != 0 -> (trunc X) <  0
   //   iff C2 is a power of 2 and it masks the sign bit of a legal integer type.
   const APInt *C2;
   if (And->hasOneUse() && C.isNullValue() && match(Y, m_APInt(C2))) {
     int32_t ExactLogBase2 = C2->exactLogBase2();
     if (ExactLogBase2 != -1 && DL.isLegalInteger(ExactLogBase2 + 1)) {
       Type *NTy = IntegerType::get(Cmp.getContext(), ExactLogBase2 + 1);
       if (auto *AndVTy = dyn_cast<VectorType>(And->getType()))
-        NTy = FixedVectorType::get(NTy, AndVTy->getNumElements());
+        NTy = FixedVectorType::get(
+            NTy, cast<FixedVectorType>(AndVTy)->getNumElements());
       Value *Trunc = Builder.CreateTrunc(X, NTy);
       auto NewPred = Cmp.getPredicate() == CmpInst::ICMP_EQ ? CmpInst::ICMP_SGE
                                                             : CmpInst::ICMP_SLT;
       return new ICmpInst(NewPred, Trunc, Constant::getNullValue(NTy));
     }
   }
 
   return nullptr;
Instruction *InstCombinerImpl::foldICmpShlConstant(ICmpInst &Cmp,
   // This enables us to get rid of the shift in favor of a trunc that may be
   // free on the target. It has the additional benefit of comparing to a
   // smaller constant that may be more target-friendly.
   unsigned Amt = ShiftAmt->getLimitedValue(TypeBits - 1);
   if (Shl->hasOneUse() && Amt != 0 && C.countTrailingZeros() >= Amt &&
       DL.isLegalInteger(TypeBits - Amt)) {
     Type *TruncTy = IntegerType::get(Cmp.getContext(), TypeBits - Amt);
     if (auto *ShVTy = dyn_cast<VectorType>(ShType))
-      TruncTy = FixedVectorType::get(TruncTy, ShVTy->getNumElements());
+      TruncTy = FixedVectorType::get(
+          TruncTy, cast<FixedVectorType>(ShVTy)->getNumElements());
     Constant *NewC =
         ConstantInt::get(TruncTy, C.ashr(*ShiftAmt).trunc(TypeBits - Amt));
     return new ICmpInst(Pred, Builder.CreateTrunc(X, TruncTy), NewC);
   }
 
   return nullptr;
 }
 
if (match(Op1, m_APInt(C)) && Bitcast->hasOneUse() &&
         // (bitcast (fpext/fptrunc X)) to iX) > -1 --> (bitcast X to iY) > -1
         Type *XType = X->getType();
 
         // We can't currently handle Power style floating point operations here.
         if (!(XType->isPPC_FP128Ty() || BCSrcOp->getType()->isPPC_FP128Ty())) {
 
           Type *NewType = Builder.getIntNTy(XType->getScalarSizeInBits());
           if (auto *XVTy = dyn_cast<VectorType>(XType))
-            NewType = FixedVectorType::get(NewType, XVTy->getNumElements());
+            NewType = FixedVectorType::get(
+                NewType, cast<FixedVectorType>(XVTy)->getNumElements());
           Value *NewBitcast = Builder.CreateBitCast(X, NewType);
           if (TrueIfSigned)
             return new ICmpInst(ICmpInst::ICMP_SLT, NewBitcast,
                                 ConstantInt::getNullValue(NewType));
           else
             return new ICmpInst(ICmpInst::ICMP_SGT, NewBitcast,
                                 ConstantInt::getAllOnesValue(NewType));
         }
static Value *foldICmpWithLowBitMaskedVal(ICmpInst &I,
   }
 
   // The mask value may be a vector constant that has undefined elements. But it
   // may not be safe to propagate those undefs into the new compare, so replace
   // those elements by copying an existing, defined, and safe scalar constant.
   Type *OpTy = M->getType();
   auto *VecC = dyn_cast<Constant>(M);
   if (OpTy->isVectorTy() && VecC && VecC->containsUndefElement()) {
-    auto *OpVTy = cast<VectorType>(OpTy);
+    auto *OpVTy = cast<FixedVectorType>(OpTy);
     Constant *SafeReplacementConstant = nullptr;
     for (unsigned i = 0, e = OpVTy->getNumElements(); i != e; ++i) {
       if (!isa<UndefValue>(VecC->getAggregateElement(i))) {
         SafeReplacementConstant = VecC->getAggregateElement(i);
         break;
       }
     }
     assert(SafeReplacementConstant && "Failed to find undef replacement");
InstCombiner::getFlippedStrictnessPredicateAndConstant(CmpInst::Predicate Pred,
   };
 
   Constant *SafeReplacementConstant = nullptr;
   if (auto *CI = dyn_cast<ConstantInt>(C)) {
     // Bail out if the constant can't be safely incremented/decremented.
     if (!ConstantIsOk(CI))
       return llvm::None;
   } else if (auto *VTy = dyn_cast<VectorType>(Type)) {
-    unsigned NumElts = VTy->getNumElements();
+    unsigned NumElts = cast<FixedVectorType>(VTy)->getNumElements();
     for (unsigned i = 0; i != NumElts; ++i) {
       Constant *Elt = C->getAggregateElement(i);
       if (!Elt)
         return llvm::None;
 
       if (isa<UndefValue>(Elt))
         continue;
 

llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp

static Value *likeBitCastFromVector(InstCombinerImpl &IC, Value *V) {
   auto *UT = cast<VectorType>(U->getType());
   auto *VT = V->getType();
   // Check that types UT and VT are bitwise isomorphic.
   const auto &DL = IC.getDataLayout();
   if (DL.getTypeStoreSizeInBits(UT) != DL.getTypeStoreSizeInBits(VT)) {
     return nullptr;
   }
   if (auto *AT = dyn_cast<ArrayType>(VT)) {
-    if (AT->getNumElements() != UT->getNumElements())
+    if (AT->getNumElements() != cast<FixedVectorType>(UT)->getNumElements())
       return nullptr;
   } else {
     auto *ST = cast<StructType>(VT);
-    if (ST->getNumElements() != UT->getNumElements())
+    if (ST->getNumElements() != cast<FixedVectorType>(UT)->getNumElements())
       return nullptr;
     for (const auto *EltT : ST->elements()) {
       if (EltT != UT->getElementType())
         return nullptr;
     }
   }
   return U;
 }

llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp

if (MaskedValueIsZero(Op1, Mask, 0, &I) &&
       MaskedValueIsZero(Op0, Mask, 0, &I)) {
     // X srem Y -> X urem Y, iff X and Y don't have sign bit set
     return BinaryOperator::CreateURem(Op0, Op1, I.getName());
   }
 
   // If it's a constant vector, flip any negative values positive.
   if (isa<ConstantVector>(Op1) || isa<ConstantDataVector>(Op1)) {
     Constant *C = cast<Constant>(Op1);
-    unsigned VWidth = cast<VectorType>(C->getType())->getNumElements();
+    unsigned VWidth = cast<FixedVectorType>(C->getType())->getNumElements();
 
     bool hasNegative = false;
     bool hasMissing = false;
     for (unsigned i = 0; i != VWidth; ++i) {
       Constant *Elt = C->getAggregateElement(i);
       if (!Elt) {
         hasMissing = true;
         break;

llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp

if (TI->getNumOperands() == 1 && TI->isCast()) {
     if (TI->getOperand(0)->getType() != FIOpndTy)
       return nullptr;
 
     // The select condition may be a vector. We may only change the operand
     // type if the vector width remains the same (and matches the condition).
     if (auto *CondVTy = dyn_cast<VectorType>(CondTy)) {
       if (!FIOpndTy->isVectorTy())
         return nullptr;
-      if (CondVTy->getNumElements() !=
-          cast<VectorType>(FIOpndTy)->getNumElements())
+      if (cast<FixedVectorType>(CondVTy)->getNumElements() !=
+          cast<FixedVectorType>(FIOpndTy)->getNumElements())
         return nullptr;
 
       // TODO: If the backend knew how to deal with casts better, we could
       // remove this limitation. For now, there's too much potential to create
       // worse codegen by promoting the select ahead of size-altering casts
       // (PR28160).
       //
       // Note that ValueTracking's matchSelectPattern() looks through casts

 /// Try to transform a vector select with a constant condition vector into a
 /// shuffle for easier combining with other shuffles and insert/extract.
 static Instruction *canonicalizeSelectToShuffle(SelectInst &SI) {
   Value *CondVal = SI.getCondition();
   Constant *CondC;
   if (!CondVal->getType()->isVectorTy() || !match(CondVal, m_Constant(CondC)))
     return nullptr;
 
-  unsigned NumElts = cast<VectorType>(CondVal->getType())->getNumElements();
+  unsigned NumElts =
+      cast<FixedVectorType>(CondVal->getType())->getNumElements();
   SmallVector<int, 16> Mask;
   Mask.reserve(NumElts);
   for (unsigned i = 0; i != NumElts; ++i) {
     Constant *Elt = CondC->getAggregateElement(i);
     if (!Elt)
       return nullptr;
 
     if (Elt->isOneValue()) {
static Instruction *canonicalizeScalarSelectOfVecs(SelectInst &Sel,
   // We can replace a single-use extract with constant index.
   Value *Cond = Sel.getCondition();
   if (!match(Cond, m_OneUse(m_ExtractElt(m_Value(), m_ConstantInt()))))
     return nullptr;
 
   // select (extelt V, Index), T, F --> select (splat V, Index), T, F
   // Splatting the extracted condition reduces code (we could directly create a
   // splat shuffle of the source vector to eliminate the intermediate step).
-  unsigned NumElts = Ty->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Ty)->getNumElements();
   return IC.replaceOperand(Sel, 0, IC.Builder.CreateVectorSplat(NumElts, Cond));
 }
 
 /// Reuse bitcasted operands between a compare and select:
 /// select (cmp (bitcast C), (bitcast D)), (bitcast' C), (bitcast' D) -->
 /// bitcast (select (cmp (bitcast C), (bitcast D)), (bitcast C), (bitcast D))
 static Instruction *foldSelectCmpBitcasts(SelectInst &Sel,
                                           InstCombiner::BuilderTy &Builder) {

llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp

Value *InstCombinerImpl::SimplifyDemandedUseBits(Value *V, APInt DemandedMask,
   }
   case Instruction::BitCast:
     if (!I->getOperand(0)->getType()->isIntOrIntVectorTy())
       return nullptr;  // vector->int or fp->int?
 
     if (VectorType *DstVTy = dyn_cast<VectorType>(I->getType())) {
       if (VectorType *SrcVTy =
             dyn_cast<VectorType>(I->getOperand(0)->getType())) {
-        if (DstVTy->getNumElements() != SrcVTy->getNumElements())
+        if (cast<FixedVectorType>(DstVTy)->getNumElements() !=
+            cast<FixedVectorType>(SrcVTy)->getNumElements())
           // Don't touch a bitcast between vectors of different element counts.
           return nullptr;
       } else
         // Don't touch a scalar-to-vector bitcast.
         return nullptr;
     } else if (I->getOperand(0)->getType()->isVectorTy())
       // Don't touch a vector-to-scalar bitcast.
       return nullptr;
case Instruction::InsertElement: {
     UndefElts.clearBit(IdxNo);
     break;
   }
   case Instruction::ShuffleVector: {
     auto *Shuffle = cast<ShuffleVectorInst>(I);
     assert(Shuffle->getOperand(0)->getType() ==
            Shuffle->getOperand(1)->getType() &&
            "Expected shuffle operands to have same type");
-    unsigned OpWidth =
-        cast<VectorType>(Shuffle->getOperand(0)->getType())->getNumElements();
+    unsigned OpWidth = cast<FixedVectorType>(Shuffle->getOperand(0)->getType())
+                           ->getNumElements();
     // Handle trivial case of a splat. Only check the first element of LHS
     // operand.
     if (all_of(Shuffle->getShuffleMask(), [](int Elt) { return Elt == 0; }) &&
         DemandedElts.isAllOnesValue()) {
       if (!isa<UndefValue>(I->getOperand(1))) {
         I->setOperand(1, UndefValue::get(I->getOperand(1)->getType()));
         MadeChange = true;
       }
for (unsigned i = 0; i < VWidth; i++) {
         }
       }
     }
 
     // Try to transform shuffle with constant vector and single element from
     // this constant vector to single insertelement instruction.
     // shufflevector V, C, <v1, v2, .., ci, .., vm> ->
     // insertelement V, C[ci], ci-n
-    if (OpWidth == Shuffle->getType()->getNumElements()) {
+    if (OpWidth ==
+        cast<FixedVectorType>(Shuffle->getType())->getNumElements()) {
       Value *Op = nullptr;
       Constant *Value = nullptr;
       unsigned Idx = -1u;
 
       // Find constant vector with the single element in shuffle (LHS or RHS).
       if (LHSIdx < OpWidth && RHSUniform) {
         if (auto *CV = dyn_cast<ConstantVector>(Shuffle->getOperand(0))) {
           Op = Shuffle->getOperand(1);
case Instruction::Select: {
     // TODO: This can be improved. See comment in select condition handling.
     UndefElts = UndefElts2 & UndefElts3;
     break;
   }
   case Instruction::BitCast: {
     // Vector->vector casts only.
     VectorType *VTy = dyn_cast<VectorType>(I->getOperand(0)->getType());
     if (!VTy) break;
-    unsigned InVWidth = VTy->getNumElements();
+    unsigned InVWidth = cast<FixedVectorType>(VTy)->getNumElements();
     APInt InputDemandedElts(InVWidth, 0);
     UndefElts2 = APInt(InVWidth, 0);
     unsigned Ratio;
 
     if (VWidth == InVWidth) {
       // If we are converting from <4 x i32> -> <4 x f32>, we demand the same
       // elements as are demanded of us.
       Ratio = 1;

llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp

static Instruction *foldBitcastExtElt(ExtractElementInst &Ext,
   if (!match(Ext.getVectorOperand(), m_BitCast(m_Value(X))) ||
       !X->getType()->isVectorTy() ||
       !match(Ext.getIndexOperand(), m_ConstantInt(ExtIndexC)))
     return nullptr;
 
   // If this extractelement is using a bitcast from a vector of the same number
   // of elements, see if we can find the source element from the source vector:
   // extelt (bitcast VecX), IndexC --> bitcast X[IndexC]
-  auto *SrcTy = cast<VectorType>(X->getType());
+  auto *SrcTy = cast<FixedVectorType>(X->getType());
   Type *DestTy = Ext.getType();
   unsigned NumSrcElts = SrcTy->getNumElements();
-  unsigned NumElts = Ext.getVectorOperandType()->getNumElements();
+  unsigned NumElts =
+      cast<FixedVectorType>(Ext.getVectorOperandType())->getNumElements();
   if (NumSrcElts == NumElts)
     if (Value *Elt = findScalarElement(X, ExtIndexC))
       return new BitCastInst(Elt, DestTy);
 
   // If the source elements are wider than the destination, try to shift and
   // truncate a subset of scalar bits of an insert op.
   if (NumSrcElts < NumElts) {
     Value *Scalar;
if (NumSrcElts < NumElts) {
     return new TruncInst(Scalar, DestTy);
   }
 
   return nullptr;
 }
 
 /// Find elements of V demanded by UserInstr.
 static APInt findDemandedEltsBySingleUser(Value *V, Instruction *UserInstr) {
-  unsigned VWidth = cast<VectorType>(V->getType())->getNumElements();
+  unsigned VWidth = cast<FixedVectorType>(V->getType())->getNumElements();
 
   // Conservatively assume that all elements are needed.
   APInt UsedElts(APInt::getAllOnesValue(VWidth));
 
   switch (UserInstr->getOpcode()) {
   case Instruction::ExtractElement: {
     ExtractElementInst *EEI = cast<ExtractElementInst>(UserInstr);
     assert(EEI->getVectorOperand() == V);
     ConstantInt *EEIIndexC = dyn_cast<ConstantInt>(EEI->getIndexOperand());
     if (EEIIndexC && EEIIndexC->getValue().ult(VWidth)) {
       UsedElts = APInt::getOneBitSet(VWidth, EEIIndexC->getZExtValue());
     }
     break;
   }
   case Instruction::ShuffleVector: {
     ShuffleVectorInst *Shuffle = cast<ShuffleVectorInst>(UserInstr);
     unsigned MaskNumElts =
-        cast<VectorType>(UserInstr->getType())->getNumElements();
+        cast<FixedVectorType>(UserInstr->getType())->getNumElements();
 
     UsedElts = APInt(VWidth, 0);
     for (unsigned i = 0; i < MaskNumElts; i++) {
       unsigned MaskVal = Shuffle->getMaskValue(i);
       if (MaskVal == -1u || MaskVal >= 2 * VWidth)
         continue;
       if (Shuffle->getOperand(0) == V && (MaskVal < VWidth))
         UsedElts.setBit(MaskVal);
static APInt findDemandedEltsBySingleUser(Value *V, Instruction *UserInstr) {
   return UsedElts;
 }
 
 /// Find union of elements of V demanded by all its users.
 /// If it is known by querying findDemandedEltsBySingleUser that
 /// no user demands an element of V, then the corresponding bit
 /// remains unset in the returned value.
 static APInt findDemandedEltsByAllUsers(Value *V) {
-  unsigned VWidth = cast<VectorType>(V->getType())->getNumElements();
+  unsigned VWidth = cast<FixedVectorType>(V->getType())->getNumElements();
 
   APInt UnionUsedElts(VWidth, 0);
   for (const Use &U : V->uses()) {
     if (Instruction *I = dyn_cast<Instruction>(U.getUser())) {
       UnionUsedElts |= findDemandedEltsBySingleUser(V, I);
     } else {
       UnionUsedElts = APInt::getAllOnesValue(VWidth);
       break;

 }
 
 /// If V is a shuffle of values that ONLY returns elements from either LHS or
 /// RHS, return the shuffle mask and true. Otherwise, return false.
 static bool collectSingleShuffleElements(Value *V, Value *LHS, Value *RHS,
                                          SmallVectorImpl<int> &Mask) {
   assert(LHS->getType() == RHS->getType() &&
          "Invalid CollectSingleShuffleElements");
-  unsigned NumElts = cast<VectorType>(V->getType())->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(V->getType())->getNumElements();
 
   if (isa<UndefValue>(V)) {
     Mask.assign(NumElts, -1);
     return true;
   }
 
   if (V == LHS) {
     for (unsigned i = 0; i != NumElts; ++i)
if (isa<UndefValue>(ScalarOp)) {  // inserting undef into vector.
         Mask[InsertedIdx] = -1;
         return true;
       }
     } else if (ExtractElementInst *EI = dyn_cast<ExtractElementInst>(ScalarOp)){
       if (isa<ConstantInt>(EI->getOperand(1))) {
         unsigned ExtractedIdx =
         cast<ConstantInt>(EI->getOperand(1))->getZExtValue();
         unsigned NumLHSElts =
-            cast<VectorType>(LHS->getType())->getNumElements();
+            cast<FixedVectorType>(LHS->getType())->getNumElements();
 
         // This must be extracting from either LHS or RHS.
         if (EI->getOperand(0) == LHS || EI->getOperand(0) == RHS) {
           // We can handle this if the vector we are inserting into is
           // transitively ok.
           if (collectSingleShuffleElements(VecOp, LHS, RHS, Mask)) {
             // If so, update the mask to reflect the inserted value.
             if (EI->getOperand(0) == LHS) {

 }
 
 /// If we have insertion into a vector that is wider than the vector that we
 /// are extracting from, try to widen the source vector to allow a single
 /// shufflevector to replace one or more insert/extract pairs.
 static void replaceExtractElements(InsertElementInst *InsElt,
                                    ExtractElementInst *ExtElt,
                                    InstCombinerImpl &IC) {
-  VectorType *InsVecType = InsElt->getType();
-  VectorType *ExtVecType = ExtElt->getVectorOperandType();
+  auto *InsVecType = cast<FixedVectorType>(InsElt->getType());
+  auto *ExtVecType = cast<FixedVectorType>(ExtElt->getVectorOperandType());
   unsigned NumInsElts = InsVecType->getNumElements();
   unsigned NumExtElts = ExtVecType->getNumElements();
 
   // The inserted-to vector must be wider than the extracted-from vector.
   if (InsVecType->getElementType() != ExtVecType->getElementType() ||
       NumExtElts >= NumInsElts)
     return;
 
if (ExtractElementInst *EI = dyn_cast<ExtractElementInst>(ScalarOp)) {
             // We tried our best, but we can't find anything compatible with RHS
             // further up the chain. Return a trivial shuffle.
             for (unsigned i = 0; i < NumElts; ++i)
               Mask[i] = i;
             return std::make_pair(V, nullptr);
           }
 
           unsigned NumLHSElts =
-              cast<VectorType>(RHS->getType())->getNumElements();
+              cast<FixedVectorType>(RHS->getType())->getNumElements();
           Mask[InsertedIdx % NumElts] = NumLHSElts + ExtractedIdx;
           return std::make_pair(LR.first, RHS);
         }
 
         if (VecOp == PermittedRHS) {
           // We've gone as far as we can: anything on the other side of the
           // extractelement will already have been converted into a shuffle.
           unsigned NumLHSElts =
-              cast<VectorType>(EI->getOperand(0)->getType())->getNumElements();
+              cast<FixedVectorType>(EI->getOperand(0)->getType())
+                  ->getNumElements();
           for (unsigned i = 0; i != NumElts; ++i)
             Mask.push_back(i == InsertedIdx ? ExtractedIdx : NumLHSElts + i);
           return std::make_pair(EI->getOperand(0), PermittedRHS);
         }
 
         // If this insertelement is a chain that comes from exactly these two
         // vectors, return the vector and the effective shuffle.
         if (EI->getOperand(0)->getType() == PermittedRHS->getType() &&
static Instruction *foldInsEltIntoSplat(InsertElementInst &InsElt) {
   Value *Op0 = Shuf->getOperand(0);
   if (!match(Op0, m_InsertElt(m_Undef(), m_Specific(X), m_ZeroInt())))
     return nullptr;
 
   // Replace the shuffle mask element at the index of this insert with a zero.
   // For example:
   // inselt (shuf (inselt undef, X, 0), undef, <0,undef,0,undef>), X, 1
   //   --> shuf (inselt undef, X, 0), undef, <0,0,0,undef>
-  unsigned NumMaskElts = Shuf->getType()->getNumElements();
+  unsigned NumMaskElts =
+      cast<FixedVectorType>(Shuf->getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumMaskElts);
   for (unsigned i = 0; i != NumMaskElts; ++i)
     NewMask[i] = i == IdxC ? 0 : Shuf->getMaskValue(i);
 
   return new ShuffleVectorInst(Op0, UndefValue::get(Op0->getType()), NewMask);
 }
 
 /// Try to fold an extract+insert element into an existing identity shuffle by
static Instruction *foldInsEltIntoIdentityShuffle(InsertElementInst &InsElt) {
   Value *X = Shuf->getOperand(0);
   if (!match(Scalar, m_ExtractElt(m_Specific(X), m_SpecificInt(IdxC))))
     return nullptr;
 
   // Replace the shuffle mask element at the index of this extract+insert with
   // that same index value.
   // For example:
   // inselt (shuf X, IdMask), (extelt X, IdxC), IdxC --> shuf X, IdMask'
-  unsigned NumMaskElts = Shuf->getType()->getNumElements();
+  unsigned NumMaskElts =
+      cast<FixedVectorType>(Shuf->getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumMaskElts);
   ArrayRef<int> OldMask = Shuf->getShuffleMask();
   for (unsigned i = 0; i != NumMaskElts; ++i) {
     if (i != IdxC) {
       // All mask elements besides the inserted element remain the same.
       NewMask[i] = OldMask[i];
     } else if (OldMask[i] == (int)IdxC) {
       // If the mask element was already set, there's nothing to do
switch (I->getOpcode()) {
     case Instruction::SIToFP:
     case Instruction::FPTrunc:
     case Instruction::FPExt:
     case Instruction::GetElementPtr: {
       // Bail out if we would create longer vector ops. We could allow creating
       // longer vector ops, but that may result in more expensive codegen.
       Type *ITy = I->getType();
       if (ITy->isVectorTy() &&
-          Mask.size() > cast<VectorType>(ITy)->getNumElements())
+          Mask.size() > cast<FixedVectorType>(ITy)->getNumElements())
         return false;
       for (Value *Operand : I->operands()) {
         if (!canEvaluateShuffled(Operand, Mask, Depth - 1))
           return false;
       }
       return true;
     }
     case Instruction::InsertElement: {
switch (I->getOpcode()) {
     case Instruction::UIToFP:
     case Instruction::SIToFP:
     case Instruction::FPTrunc:
     case Instruction::FPExt:
     case Instruction::Select:
     case Instruction::GetElementPtr: {
       SmallVector<Value*, 8> NewOps;
       bool NeedsRebuild =
-          (Mask.size() != cast<VectorType>(I->getType())->getNumElements());
+          (Mask.size() !=
+           cast<FixedVectorType>(I->getType())->getNumElements());
       for (int i = 0, e = I->getNumOperands(); i != e; ++i) {
         Value *V;
         // Recursively call evaluateInDifferentElementOrder on vector arguments
         // as well. E.g. GetElementPtr may have scalar operands even if the
         // return value is a vector, so we need to examine the operand type.
         if (I->getOperand(i)->getType()->isVectorTy())
           V = evaluateInDifferentElementOrder(I->getOperand(i), Mask);
         else

 // LHS, for example:
 //                 +--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
 //   Input:        |AA|BB|CC|DD|EE|FF|GG|HH|II|JJ|KK|LL|MM|NN|OO|PP|
 //   Shuffles to:  |EE|FF|GG|HH|
 //                 +--+--+--+--+
 static bool isShuffleExtractingFromLHS(ShuffleVectorInst &SVI,
                                        ArrayRef<int> Mask) {
   unsigned LHSElems =
-      cast<VectorType>(SVI.getOperand(0)->getType())->getNumElements();
+      cast<FixedVectorType>(SVI.getOperand(0)->getType())->getNumElements();
   unsigned MaskElems = Mask.size();
   unsigned BegIdx = Mask.front();
   unsigned EndIdx = Mask.back();
   if (BegIdx > EndIdx || EndIdx >= LHSElems || EndIdx - BegIdx != MaskElems - 1)
     return false;
   for (unsigned I = 0; I != MaskElems; ++I)
     if (static_cast<unsigned>(Mask[I]) != BegIdx + I)
       return false;
static Instruction *canonicalizeInsertSplat(ShuffleVectorInst &Shuf,
   UndefValue *UndefVec = UndefValue::get(Shuf.getType());
   Constant *Zero = Builder.getInt32(0);
   Value *NewIns = Builder.CreateInsertElement(UndefVec, X, Zero);
 
   // Splat from element 0. Any mask element that is undefined remains undefined.
   // For example:
   // shuf (inselt undef, X, 2), undef, <2,2,undef>
   //   --> shuf (inselt undef, X, 0), undef, <0,0,undef>
-  unsigned NumMaskElts = Shuf.getType()->getNumElements();
+  unsigned NumMaskElts =
+      cast<FixedVectorType>(Shuf.getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumMaskElts, 0);
   for (unsigned i = 0; i != NumMaskElts; ++i)
     if (Mask[i] == UndefMaskElem)
       NewMask[i] = Mask[i];
 
   return new ShuffleVectorInst(NewIns, UndefVec, NewMask);
 }
 
 /// Try to fold shuffles that are the equivalent of a vector select.
 static Instruction *foldSelectShuffle(ShuffleVectorInst &Shuf,
                                       InstCombiner::BuilderTy &Builder,
                                       const DataLayout &DL) {
   if (!Shuf.isSelect())
     return nullptr;
 
   // Canonicalize to choose from operand 0 first unless operand 1 is undefined.
   // Commuting undef to operand 0 conflicts with another canonicalization.
-  unsigned NumElts = Shuf.getType()->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Shuf.getType())->getNumElements();
   if (!isa<UndefValue>(Shuf.getOperand(1)) &&
       Shuf.getMaskValue(0) >= (int)NumElts) {
     // TODO: Can we assert that both operands of a shuffle-select are not undef
     // (otherwise, it would have been folded by instsimplify?
     Shuf.commute();
     return &Shuf;
   }
 
static Instruction *foldTruncShuffle(ShuffleVectorInst &Shuf,
   if (!match(Shuf.getOperand(0), m_BitCast(m_Value(X))) ||
       !match(Shuf.getOperand(1), m_Undef()) || !DestType->isIntOrIntVectorTy())
     return nullptr;
 
   // The source type must have the same number of elements as the shuffle,
   // and the source element type must be larger than the shuffle element type.
   Type *SrcType = X->getType();
   if (!SrcType->isVectorTy() || !SrcType->isIntOrIntVectorTy() ||
-      cast<VectorType>(SrcType)->getNumElements() !=
-          cast<VectorType>(DestType)->getNumElements() ||
+      cast<FixedVectorType>(SrcType)->getNumElements() !=
+          cast<FixedVectorType>(DestType)->getNumElements() ||
       SrcType->getScalarSizeInBits() % DestType->getScalarSizeInBits() != 0)
     return nullptr;
 
   assert(Shuf.changesLength() && !Shuf.increasesLength() &&
          "Expected a shuffle that decreases length");
 
   // Last, check that the mask chooses the correct low bits for each narrow
   // element in the result.
static Instruction *narrowVectorSelect(ShuffleVectorInst &Shuf,
   // TODO: The one-use requirement could be eased if X and/or Y are constants.
   Value *Cond, *X, *Y;
   if (!match(Shuf.getOperand(0),
              m_OneUse(m_Select(m_Value(Cond), m_Value(X), m_Value(Y)))))
     return nullptr;
 
   // We need a narrow condition value. It must be extended with undef elements
   // and have the same number of elements as this shuffle.
-  unsigned NarrowNumElts = Shuf.getType()->getNumElements();
+  unsigned NarrowNumElts =
+      cast<FixedVectorType>(Shuf.getType())->getNumElements();
   Value *NarrowCond;
   if (!match(Cond, m_OneUse(m_Shuffle(m_Value(NarrowCond), m_Undef()))) ||
-      cast<VectorType>(NarrowCond->getType())->getNumElements() !=
+      cast<FixedVectorType>(NarrowCond->getType())->getNumElements() !=
           NarrowNumElts ||
       !cast<ShuffleVectorInst>(Cond)->isIdentityWithPadding())
     return nullptr;
 
   // shuf (sel (shuf NarrowCond, undef, WideMask), X, Y), undef, NarrowMask) -->
   // sel NarrowCond, (shuf X, undef, NarrowMask), (shuf Y, undef, NarrowMask)
   Value *Undef = UndefValue::get(X->getType());
   Value *NarrowX = Builder.CreateShuffleVector(X, Undef, Shuf.getShuffleMask());
static Instruction *foldIdentityExtractShuffle(ShuffleVectorInst &Shuf) {
   // This transform is conservatively limited to identity extracts because we do
   // not allow arbitrary shuffle mask creation as a target-independent transform
   // (because we can't guarantee that will lower efficiently).
   //
   // If the extracting shuffle has an undef mask element, it transfers to the
   // new shuffle mask. Otherwise, copy the original mask element. Example:
   //   shuf (shuf X, Y, <C0, C1, C2, undef, C4>), undef, <0, undef, 2, 3> -->
   //   shuf X, Y, <C0, undef, C2, undef>
-  unsigned NumElts = Shuf.getType()->getNumElements();
+  unsigned NumElts = cast<FixedVectorType>(Shuf.getType())->getNumElements();
   SmallVector<int, 16> NewMask(NumElts);
   assert(NumElts < Mask.size() &&
          "Identity with extract must have less elements than its inputs");
 
   for (unsigned i = 0; i != NumElts; ++i) {
     int ExtractMaskElt = Shuf.getMaskValue(i);
     int MaskElt = Mask[i];
     NewMask[i] = ExtractMaskElt == UndefMaskElem ? ExtractMaskElt : MaskElt;
   }
   return new ShuffleVectorInst(X, Y, NewMask);
 }
 
 /// Try to replace a shuffle with an insertelement or try to replace a shuffle
 /// operand with the operand of an insertelement.
 static Instruction *foldShuffleWithInsert(ShuffleVectorInst &Shuf,
                                           InstCombinerImpl &IC) {
   Value *V0 = Shuf.getOperand(0), *V1 = Shuf.getOperand(1);
   SmallVector<int, 16> Mask;
   Shuf.getShuffleMask(Mask);
 
   // The shuffle must not change vector sizes.
   // TODO: This restriction could be removed if the insert has only one use
   //       (because the transform would require a new length-changing shuffle).
   int NumElts = Mask.size();
-  if (NumElts != (int)(cast<VectorType>(V0->getType())->getNumElements()))
+  if (NumElts != (int)(cast<FixedVectorType>(V0->getType())->getNumElements()))
     return nullptr;
 
   // This is a specialization of a fold in SimplifyDemandedVectorElts. We may
   // not be able to handle it there if the insertelement has >1 use.
   // If the shuffle has an insertelement operand but does not choose the
   // inserted scalar element from that value, then we can replace that shuffle
   // operand with the source vector of the insertelement.
   Value *X;
static Instruction *foldIdentityPaddedShuffles(ShuffleVectorInst &Shuf) {
   // We limit this transform to power-of-2 types because we expect that the
   // backend can convert the simplified IR patterns to identical nodes as the
   // original IR.
   // TODO: If we can verify the same behavior for arbitrary types, the
   //       power-of-2 checks can be removed.
   Value *X = Shuffle0->getOperand(0);
   Value *Y = Shuffle1->getOperand(0);
   if (X->getType() != Y->getType() ||
-      !isPowerOf2_32(Shuf.getType()->getNumElements()) ||
-      !isPowerOf2_32(Shuffle0->getType()->getNumElements()) ||
-      !isPowerOf2_32(cast<VectorType>(X->getType())->getNumElements()) ||
+      !isPowerOf2_32(cast<FixedVectorType>(Shuf.getType())->getNumElements()) ||
+      !isPowerOf2_32(
+          cast<FixedVectorType>(Shuffle0->getType())->getNumElements()) ||
+      !isPowerOf2_32(cast<FixedVectorType>(X->getType())->getNumElements()) ||
       isa<UndefValue>(X) || isa<UndefValue>(Y))
     return nullptr;
   assert(isa<UndefValue>(Shuffle0->getOperand(1)) &&
          isa<UndefValue>(Shuffle1->getOperand(1)) &&
          "Unexpected operand for identity shuffle");
 
   // This is a shuffle of 2 widening shuffles. We can shuffle the narrow source
   // operands directly by adjusting the shuffle mask to account for the narrower
   // types:
   // shuf (widen X), (widen Y), Mask --> shuf X, Y, Mask'
-  int NarrowElts = cast<VectorType>(X->getType())->getNumElements();
-  int WideElts = Shuffle0->getType()->getNumElements();
+  int NarrowElts = cast<FixedVectorType>(X->getType())->getNumElements();
+  int WideElts = cast<FixedVectorType>(Shuffle0->getType())->getNumElements();
   assert(WideElts > NarrowElts && "Unexpected types for identity with padding");
 
   ArrayRef<int> Mask = Shuf.getShuffleMask();
   SmallVector<int, 16> NewMask(Mask.size(), -1);
   for (int i = 0, e = Mask.size(); i != e; ++i) {
     if (Mask[i] == -1)
       continue;
 

 Instruction *InstCombinerImpl::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
   Value *LHS = SVI.getOperand(0);
   Value *RHS = SVI.getOperand(1);
   SimplifyQuery ShufQuery = SQ.getWithInstruction(&SVI);
   if (auto *V = SimplifyShuffleVectorInst(LHS, RHS, SVI.getShuffleMask(),
                                           SVI.getType(), ShufQuery))
     return replaceInstUsesWith(SVI, V);
 
   // shuffle x, x, mask --> shuffle x, undef, mask'
-  unsigned VWidth = SVI.getType()->getNumElements();
-  unsigned LHSWidth = cast<VectorType>(LHS->getType())->getNumElements();
+  unsigned VWidth = cast<FixedVectorType>(SVI.getType())->getNumElements();
+  unsigned LHSWidth = cast<FixedVectorType>(LHS->getType())->getNumElements();
   ArrayRef<int> Mask = SVI.getShuffleMask();
   Type *Int32Ty = Type::getInt32Ty(SVI.getContext());
 
   // Peek through a bitcasted shuffle operand by scaling the mask. If the
   // simulated shuffle can simplify, then this shuffle is unnecessary:
   // shuf (bitcast X), undef, Mask --> bitcast X'
   // TODO: This could be extended to allow length-changing shuffles.
   //       The transform might also be obsoleted if we allowed canonicalization
   //       of bitcasted shuffles.
   Value *X;
   if (match(LHS, m_BitCast(m_Value(X))) && match(RHS, m_Undef()) &&
       X->getType()->isVectorTy() && VWidth == LHSWidth) {
     // Try to create a scaled mask constant.
-    auto *XType = cast<VectorType>(X->getType());
+    auto *XType = cast<FixedVectorType>(X->getType());
     unsigned XNumElts = XType->getNumElements();
     SmallVector<int, 16> ScaledMask;
     if (XNumElts >= VWidth) {
       assert(XNumElts % VWidth == 0 && "Unexpected vector bitcast");
       narrowShuffleMaskElts(XNumElts / VWidth, Mask, ScaledMask);
     } else {
       assert(VWidth % XNumElts == 0 && "Unexpected vector bitcast");
       if (!widenShuffleMaskElts(VWidth / XNumElts, Mask, ScaledMask))
Instruction *InstCombinerImpl::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
   //     <4 x i32>: |           |           |           |           |
   //                +-----------+-----------+-----------+-----------+
   // Index range [6,10):              ^-----------^ Needs an extra shuffle.
   // Target type i40:           ^--------------^ Won't work, bail.
   bool MadeChange = false;
   if (isShuffleExtractingFromLHS(SVI, Mask)) {
     Value *V = LHS;
     unsigned MaskElems = Mask.size();
-    VectorType *SrcTy = cast<VectorType>(V->getType());
+    auto *SrcTy = cast<FixedVectorType>(V->getType());
     unsigned VecBitWidth = SrcTy->getPrimitiveSizeInBits().getFixedSize();
     unsigned SrcElemBitWidth = DL.getTypeSizeInBits(SrcTy->getElementType());
     assert(SrcElemBitWidth && "vector elements must have a bitwidth");
     unsigned SrcNumElems = SrcTy->getNumElements();
     SmallVector<BitCastInst *, 8> BCs;
     DenseMap<Type *, Value *> NewBCs;
     for (User *U : SVI.users())
       if (BitCastInst *BC = dyn_cast<BitCastInst>(U))
Instruction *InstCombinerImpl::visitShuffleVectorInst(ShuffleVectorInst &SVI) {
   Value* LHSOp0 = nullptr;
   Value* LHSOp1 = nullptr;
   Value* RHSOp0 = nullptr;
   unsigned LHSOp0Width = 0;
   unsigned RHSOp0Width = 0;
   if (LHSShuffle) {
     LHSOp0 = LHSShuffle->getOperand(0);
     LHSOp1 = LHSShuffle->getOperand(1);
-    LHSOp0Width = cast<VectorType>(LHSOp0->getType())->getNumElements();
+    LHSOp0Width = cast<FixedVectorType>(LHSOp0->getType())->getNumElements();
   }
   if (RHSShuffle) {
     RHSOp0 = RHSShuffle->getOperand(0);
-    RHSOp0Width = cast<VectorType>(RHSOp0->getType())->getNumElements();
+    RHSOp0Width = cast<FixedVectorType>(RHSOp0->getType())->getNumElements();
   }
   Value* newLHS = LHS;
   Value* newRHS = RHS;
   if (LHSShuffle) {
     // case 1
     if (isa<UndefValue>(RHS)) {
       newLHS = LHSOp0;
       newRHS = LHSOp1;

llvm/lib/Transforms/InstCombine/InstructionCombining.cpp

if (auto *BC = dyn_cast<BitCastInst>(&Op)) {
     VectorType *DestTy = dyn_cast<VectorType>(BC->getDestTy());
     VectorType *SrcTy = dyn_cast<VectorType>(BC->getSrcTy());
 
     // Verify that either both or neither are vectors.
     if ((SrcTy == nullptr) != (DestTy == nullptr))
       return nullptr;
 
     // If vectors, verify that they have the same number of elements.
-    if (SrcTy && SrcTy->getNumElements() != DestTy->getNumElements())
+    if (SrcTy && cast<FixedVectorType>(SrcTy)->getNumElements() !=
+                     cast<FixedVectorType>(DestTy)->getNumElements())
       return nullptr;
   }
 
   // Test if a CmpInst instruction is used exclusively by a select as
   // part of a minimum or maximum operation. If so, refrain from doing
   // any other folding. This helps out other analyses which understand
   // non-obfuscated minimum and maximum idioms, such as ScalarEvolution
   // and CodeGen. And in this case, at least one of the comparison
if (auto *BCI = dyn_cast<BitCastInst>(ASCStrippedPtrOp)) {
     Type *SrcEltType = SrcType->getElementType();
 
     // GEP directly using the source operand if this GEP is accessing an element
     // of a bitcasted pointer to vector or array of the same dimensions:
     // gep (bitcast <c x ty>* X to [c x ty]*), Y, Z --> gep X, Y, Z
     // gep (bitcast [c x ty]* X to <c x ty>*), Y, Z --> gep X, Y, Z
     auto areMatchingArrayAndVecTypes = [](Type *ArrTy, Type *VecTy,
                                           const DataLayout &DL) {
-      auto *VecVTy = cast<VectorType>(VecTy);
+      auto *VecVTy = cast<FixedVectorType>(VecTy);
       return ArrTy->getArrayElementType() == VecVTy->getElementType() &&
              ArrTy->getArrayNumElements() == VecVTy->getNumElements() &&
              DL.getTypeAllocSize(ArrTy) == DL.getTypeAllocSize(VecTy);
     };
     if (GEP.getNumOperands() == 3 &&
         ((GEPEltType->isArrayTy() && SrcEltType->isVectorTy() &&
           areMatchingArrayAndVecTypes(GEPEltType, SrcEltType, DL)) ||
          (GEPEltType->isVectorTy() && SrcEltType->isArrayTy() &&