[Alignment][NFC] Migrate TargetTransformInfo::allowsMisalignedMemoryAccesses to Align

[gchatelet]

Summary

This patch is part of a series to introduce an Alignment type.
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2019-July/133851.html
See this patch for the introduction of the type: https://reviews.llvm.org/D64790

[gchatelet]

llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp

898

[allowsMisalignedMemoryAccesses](https://github.com/llvm/llvm-project/blob/70f6389257a85a8fa7f128a05a1ccbd0dbba191c/llvm/include/llvm/CodeGen/TargetLowering.h#L1576) can only consider valid alignment. 0 here is not a valid value, that's why it is turned into a 1.

llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

252

ditto

[courbet]

llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp

898

This is not necessarily and NFC (see my other comment below).

llvm/lib/Target/ARM/ARMISelLowering.cpp

16150

When alignment was 0, and v8i8, this is not an NFC.

[gchatelet]

llvm/lib/Target/ARM/ARMISelLowering.cpp

16150

Ty == MVT::v4i8 || Ty == MVT::v8i8 || Ty == MVT::v4i16 so Ty is either 32 or 64 bits (v4i8 is 32, v8i8 and v4i16 are 64)
Since VT is a SimpleVT => VT.getScalarSizeInBits() can only be 32 or 64 as well.
Then VT.getScalarSizeInBits() / 8 can only be 4 or 8 so it doesn't matter whether Alignment is 0 or 1.

Or am I missing something?

[courbet]

llvm/lib/Target/ARM/ARMISelLowering.cpp

16150

isSimple means native to some processor (as opposed to extended). But e.g. MVT::v8i8 is both a simple and vector EVT. the scalar type for MVT::v8i8 is MVT::i8, so VT.getScalarSizeInBits()==8, i.e. VT.getScalarSizeInBits() / 8 == 1

[gchatelet]

llvm/lib/Target/ARM/ARMISelLowering.cpp

16150

Ha I see thx for the explanation and good catch!

@dmgreen @samparker what do you think?
I fail to see whether you considered Alignment being 0 when writing D65580.
For context see this line and this line.

As-is, the whole test suite still passes.

[gchatelet]

llvm/lib/Target/ARM/ARMISelLowering.cpp

16150

A gentle ping @dmgreen @samparker

[gchatelet]

rebase

[gchatelet]

rebase

[gchatelet]

@courbet I'm still willing to push this one. Shall I remove [NFC] and call it a day?
AFAICT it's the only show stopper here.

[RKSimon]

@gchatelet Abandon after D96097 ?

[gchatelet]

In D82876#2545580, @RKSimon wrote:

@gchatelet Abandon after D96097 ?

Yes : )

llvm/include/llvm/Analysis/TargetTransformInfo.h

public:
   /// platform, scalar floating-point math does.
   /// This applies to floating-point math operations and calls, not memory
   /// operations, shuffles, or casts.
   bool isFPVectorizationPotentiallyUnsafe() const;
 
   /// Determine if the target supports unaligned memory accesses.
   bool allowsMisalignedMemoryAccesses(LLVMContext &Context, unsigned BitWidth,
                                       unsigned AddressSpace = 0,
-                                      unsigned Alignment = 1,
+                                      Align Alignment = Align(1),
                                       bool *Fast = nullptr) const;
 
   /// Return hardware support for population count.
   PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) const;
 
   /// Return true if the hardware has a fast square-root instruction.
   bool haveFastSqrt(Type *Ty) const;
 
public:
   virtual MemCmpExpansionOptions
   enableMemCmpExpansion(bool OptSize, bool IsZeroCmp) const = 0;
   virtual bool enableInterleavedAccessVectorization() = 0;
   virtual bool enableMaskedInterleavedAccessVectorization() = 0;
   virtual bool isFPVectorizationPotentiallyUnsafe() = 0;
   virtual bool allowsMisalignedMemoryAccesses(LLVMContext &Context,
                                               unsigned BitWidth,
                                               unsigned AddressSpace,
-                                              unsigned Alignment,
-                                              bool *Fast) = 0;
+                                              Align Alignment, bool *Fast) = 0;
   virtual PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) = 0;
   virtual bool haveFastSqrt(Type *Ty) = 0;
   virtual bool isFCmpOrdCheaperThanFCmpZero(Type *Ty) = 0;
   virtual int getFPOpCost(Type *Ty) = 0;
   virtual int getIntImmCodeSizeCost(unsigned Opc, unsigned Idx,
                                     const APInt &Imm, Type *Ty) = 0;
   virtual int getIntImmCost(const APInt &Imm, Type *Ty,
                             TargetCostKind CostKind) = 0;
public:
   }
   bool enableMaskedInterleavedAccessVectorization() override {
     return Impl.enableMaskedInterleavedAccessVectorization();
   }
   bool isFPVectorizationPotentiallyUnsafe() override {
     return Impl.isFPVectorizationPotentiallyUnsafe();
   }
   bool allowsMisalignedMemoryAccesses(LLVMContext &Context, unsigned BitWidth,
-                                      unsigned AddressSpace, unsigned Alignment,
+                                      unsigned AddressSpace, Align Alignment,
                                       bool *Fast) override {
     return Impl.allowsMisalignedMemoryAccesses(Context, BitWidth, AddressSpace,
                                                Alignment, Fast);
   }
   PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) override {
     return Impl.getPopcntSupport(IntTyWidthInBit);
   }
   bool haveFastSqrt(Type *Ty) override { return Impl.haveFastSqrt(Ty); }

llvm/include/llvm/Analysis/TargetTransformInfoImpl.h

public:
 
   bool enableInterleavedAccessVectorization() { return false; }
 
   bool enableMaskedInterleavedAccessVectorization() { return false; }
 
   bool isFPVectorizationPotentiallyUnsafe() { return false; }
 
   bool allowsMisalignedMemoryAccesses(LLVMContext &Context, unsigned BitWidth,
-                                      unsigned AddressSpace, unsigned Alignment,
+                                      unsigned AddressSpace, Align Alignment,
                                       bool *Fast) {
     return false;
   }
 
   TTI::PopcntSupportKind getPopcntSupport(unsigned IntTyWidthInBit) {
     return TTI::PSK_Software;
   }
 

llvm/include/llvm/CodeGen/BasicTTIImpl.h

protected:
   virtual ~BasicTTIImplBase() = default;
 
   using TargetTransformInfoImplBase::DL;
 
 public:
   /// \name Scalar TTI Implementations
   /// @{
   bool allowsMisalignedMemoryAccesses(LLVMContext &Context, unsigned BitWidth,
-                                      unsigned AddressSpace, unsigned Alignment,
+                                      unsigned AddressSpace, Align Alignment,
                                       bool *Fast) const {
     EVT E = EVT::getIntegerVT(Context, BitWidth);
     return getTLI()->allowsMisalignedMemoryAccesses(
         E, AddressSpace, Alignment, MachineMemOperand::MONone, Fast);
   }
 
   bool hasBranchDivergence() { return false; }
 

llvm/include/llvm/CodeGen/TargetLowering.h

#include "llvm/IR/ConstrainedOps.def"
   /// This function returns true if the target allows unaligned memory accesses
   /// of the specified type in the given address space. If true, it also returns
   /// whether the unaligned memory access is "fast" in the last argument by
   /// reference. This is used, for example, in situations where an array
   /// copy/move/set is converted to a sequence of store operations. Its use
   /// helps to ensure that such replacements don't generate code that causes an
   /// alignment error (trap) on the target machine.
   virtual bool allowsMisalignedMemoryAccesses(
-      EVT, unsigned AddrSpace = 0, unsigned Align = 1,
+      EVT, unsigned AddrSpace = 0, Align Alignment = Align(1),
       MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
       bool * /*Fast*/ = nullptr) const {
     return false;
   }
 
   /// LLT handling variant.
   virtual bool allowsMisalignedMemoryAccesses(
       LLT, unsigned AddrSpace = 0, Align Alignment = Align(1),

llvm/lib/Analysis/TargetTransformInfo.cpp

 
 bool TargetTransformInfo::isFPVectorizationPotentiallyUnsafe() const {
   return TTIImpl->isFPVectorizationPotentiallyUnsafe();
 }
 
 bool TargetTransformInfo::allowsMisalignedMemoryAccesses(LLVMContext &Context,
                                                          unsigned BitWidth,
                                                          unsigned AddressSpace,
-                                                         unsigned Alignment,
+                                                         Align Alignment,
                                                          bool *Fast) const {
   return TTIImpl->allowsMisalignedMemoryAccesses(Context, BitWidth,
                                                  AddressSpace, Alignment, Fast);
 }
 
 TargetTransformInfo::PopcntSupportKind
 TargetTransformInfo::getPopcntSupport(unsigned IntTyWidthInBit) const {
   return TTIImpl->getPopcntSupport(IntTyWidthInBit);

llvm/lib/CodeGen/CodeGenPrepare.cpp

bool isProfitableToPromote() {
     Value *ValIdx = Transition->getOperand(getTransitionOriginalValueIdx());
     unsigned Index = isa<ConstantInt>(ValIdx)
                          ? cast<ConstantInt>(ValIdx)->getZExtValue()
                          : -1;
     Type *PromotedType = getTransitionType();
 
     StoreInst *ST = cast<StoreInst>(CombineInst);
     unsigned AS = ST->getPointerAddressSpace();
-    unsigned Align = ST->getAlignment();
     // Check if this store is supported.
     if (!TLI.allowsMisalignedMemoryAccesses(
             TLI.getValueType(DL, ST->getValueOperand()->getType()), AS,
-            Align)) {
+            ST->getAlign())) {
       // If this is not supported, there is no way we can combine
       // the extract with the store.
       return false;
     }
 
     // The scalar chain of computation has to pay for the transition
     // scalar to vector.
     // The vector chain has to account for the combining cost.

llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp

while (TySize > Size) {
 
       // If the new LLT cannot cover all of the remaining bits, then consider
       // issuing a (or a pair of) unaligned and overlapping load / store.
       bool Fast;
       // Need to get a VT equivalent for allowMisalignedMemoryAccesses().
       MVT VT = getMVTForLLT(Ty);
       if (NumMemOps && Op.allowOverlap() && NewTySize < Size &&
           TLI.allowsMisalignedMemoryAccesses(
-              VT, DstAS, Op.isFixedDstAlign() ? Op.getDstAlign().value() : 0,
+              VT, DstAS, Op.isFixedDstAlign() ? Op.getDstAlign() : Align(1),
               MachineMemOperand::MONone, &Fast) &&
           Fast)
         TySize = Size;
       else {
         Ty = NewTy;
         TySize = NewTySize;
       }
     }

llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp

bool TargetLowering::findOptimalMemOpLowering(
   EVT VT = getOptimalMemOpType(Op, FuncAttributes);
 
   if (VT == MVT::Other) {
     // Use the largest integer type whose alignment constraints are satisfied.
     // We only need to check DstAlign here as SrcAlign is always greater or
     // equal to DstAlign (or zero).
     VT = MVT::i64;
     if (Op.isFixedDstAlign())
-      while (
-          Op.getDstAlign() < (VT.getSizeInBits() / 8) &&
-          !allowsMisalignedMemoryAccesses(VT, DstAS, Op.getDstAlign().value()))
+      while (Op.getDstAlign() < (VT.getSizeInBits() / 8) &&
+             !allowsMisalignedMemoryAccesses(VT, DstAS, Op.getDstAlign()))
         VT = (MVT::SimpleValueType)(VT.getSimpleVT().SimpleTy - 1);
     assert(VT.isInteger());
 
     // Find the largest legal integer type.
     MVT LVT = MVT::i64;
     while (!isTypeLegal(LVT))
       LVT = (MVT::SimpleValueType)(LVT.SimpleTy - 1);
     assert(LVT.isInteger());
while (VTSize > Size) {
       }
       NewVTSize = NewVT.getSizeInBits() / 8;
 
       // If the new VT cannot cover all of the remaining bits, then consider
       // issuing a (or a pair of) unaligned and overlapping load / store.
       bool Fast;
       if (NumMemOps && Op.allowOverlap() && NewVTSize < Size &&
           allowsMisalignedMemoryAccesses(
-              VT, DstAS, Op.isFixedDstAlign() ? Op.getDstAlign().value() : 0,
+              VT, DstAS, Op.isFixedDstAlign() ? Op.getDstAlign() : Align(1),
               MachineMemOperand::MONone, &Fast) &&
           Fast)
         VTSize = Size;
       else {
         VT = NewVT;
         VTSize = NewVTSize;
       }
     }

llvm/lib/CodeGen/TargetLoweringBase.cpp

bool TargetLoweringBase::allowsMemoryAccessForAlignment(
   if (Alignment >= DL.getABITypeAlign(Ty)) {
     // Assume that an access that meets the ABI-specified alignment is fast.
     if (Fast != nullptr)
       *Fast = true;
     return true;
   }
 
   // This is a misaligned access.
-  return allowsMisalignedMemoryAccesses(VT, AddrSpace, Alignment.value(), Flags,
+  return allowsMisalignedMemoryAccesses(VT, AddrSpace, Alignment, Flags,
                                         Fast);
 }
 
 bool TargetLoweringBase::allowsMemoryAccessForAlignment(
     LLVMContext &Context, const DataLayout &DL, EVT VT,
     const MachineMemOperand &MMO, bool *Fast) const {
   return allowsMemoryAccessForAlignment(Context, DL, VT, MMO.getAddrSpace(),
                                         MMO.getAlign(), MMO.getFlags(), Fast);

llvm/lib/Target/AArch64/AArch64ISelLowering.h

bool targetShrinkDemandedConstant(SDValue Op, const APInt &DemandedBits,
                                     const APInt &DemandedElts,
                                     TargetLoweringOpt &TLO) const override;
 
   MVT getScalarShiftAmountTy(const DataLayout &DL, EVT) const override;
 
   /// Returns true if the target allows unaligned memory accesses of the
   /// specified type.
   bool allowsMisalignedMemoryAccesses(
-      EVT VT, unsigned AddrSpace = 0, unsigned Align = 1,
+      EVT VT, unsigned AddrSpace = 0, Align Alignment = Align(1),
       MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
       bool *Fast = nullptr) const override;
   /// LLT variant.
   bool allowsMisalignedMemoryAccesses(LLT Ty, unsigned AddrSpace,
                                       Align Alignment,
                                       MachineMemOperand::Flags Flags,
                                       bool *Fast = nullptr) const override;
 

llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

 }
 
 MVT AArch64TargetLowering::getScalarShiftAmountTy(const DataLayout &DL,
                                                   EVT) const {
   return MVT::i64;
 }
 
 bool AArch64TargetLowering::allowsMisalignedMemoryAccesses(
-    EVT VT, unsigned AddrSpace, unsigned Align, MachineMemOperand::Flags Flags,
+    EVT VT, unsigned AddrSpace, Align Alignment, MachineMemOperand::Flags Flags,
     bool *Fast) const {
   if (Subtarget->requiresStrictAlign())
     return false;
 
   if (Fast) {
     // Some CPUs are fine with unaligned stores except for 128-bit ones.
     *Fast = !Subtarget->isMisaligned128StoreSlow() || VT.getStoreSize() != 16 ||
             // See comments in performSTORECombine() for more details about
             // these conditions.
 
             // Code that uses clang vector extensions can mark that it
             // wants unaligned accesses to be treated as fast by
             // underspecifying alignment to be 1 or 2.
-            Align <= 2 ||
+            Alignment <= 2 ||
 
             // Disregard v2i64. Memcpy lowering produces those and splitting
             // them regresses performance on micro-benchmarks and olden/bh.
             VT == MVT::v2i64;
   }
   return true;
 }
 
SDValue AArch64TargetLowering::LowerSTORE(SDValue Op,
 
   if (VT.isVector()) {
     if (useSVEForFixedLengthVectorVT(VT))
       return LowerFixedLengthVectorStoreToSVE(Op, DAG);
 
     unsigned AS = StoreNode->getAddressSpace();
     Align Alignment = StoreNode->getAlign();
     if (Alignment < MemVT.getStoreSize() &&
-        !allowsMisalignedMemoryAccesses(MemVT, AS, Alignment.value(),
+        !allowsMisalignedMemoryAccesses(MemVT, AS, Alignment,
                                         StoreNode->getMemOperand()->getFlags(),
                                         nullptr)) {
       return scalarizeVectorStore(StoreNode, DAG);
     }
 
     if (StoreNode->isTruncatingStore()) {
       return LowerTruncateVectorStore(Dl, StoreNode, VT, MemVT, DAG);
     }
EVT AArch64TargetLowering::getOptimalMemOpType(
   // Only use AdvSIMD to implement memset of 32-byte and above. It would have
   // taken one instruction to materialize the v2i64 zero and one store (with
   // restrictive addressing mode). Just do i64 stores.
   bool IsSmallMemset = Op.isMemset() && Op.size() < 32;
   auto AlignmentIsAcceptable = [&](EVT VT, Align AlignCheck) {
     if (Op.isAligned(AlignCheck))
       return true;
     bool Fast;
-    return allowsMisalignedMemoryAccesses(VT, 0, 1, MachineMemOperand::MONone,
-                                          &Fast) &&
+    return allowsMisalignedMemoryAccesses(VT, 0, Align(1),
+                                          MachineMemOperand::MONone, &Fast) &&
            Fast;
   };
 
   if (CanUseNEON && Op.isMemset() && !IsSmallMemset &&
       AlignmentIsAcceptable(MVT::v2i64, Align(16)))
     return MVT::v2i64;
   if (CanUseFP && !IsSmallMemset && AlignmentIsAcceptable(MVT::f128, Align(16)))
     return MVT::f128;
LLT AArch64TargetLowering::getOptimalMemOpLLT(
   // Only use AdvSIMD to implement memset of 32-byte and above. It would have
   // taken one instruction to materialize the v2i64 zero and one store (with
   // restrictive addressing mode). Just do i64 stores.
   bool IsSmallMemset = Op.isMemset() && Op.size() < 32;
   auto AlignmentIsAcceptable = [&](EVT VT, Align AlignCheck) {
     if (Op.isAligned(AlignCheck))
       return true;
     bool Fast;
-    return allowsMisalignedMemoryAccesses(VT, 0, 1, MachineMemOperand::MONone,
-                                          &Fast) &&
+    return allowsMisalignedMemoryAccesses(VT, 0, Align(1),
+                                          MachineMemOperand::MONone, &Fast) &&
            Fast;
   };
 
   if (CanUseNEON && Op.isMemset() && !IsSmallMemset &&
       AlignmentIsAcceptable(MVT::v2i64, Align(16)))
     return LLT::vector(2, 64);
   if (CanUseFP && !IsSmallMemset && AlignmentIsAcceptable(MVT::f128, Align(16)))
     return LLT::scalar(128);

llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp

SDValue AMDGPUTargetLowering::performLoadCombine(SDNode *N,
   Align Alignment = LN->getAlign();
   if (Alignment < Size && isTypeLegal(VT)) {
     bool IsFast;
     unsigned AS = LN->getAddressSpace();
 
     // Expand unaligned loads earlier than legalization. Due to visitation order
     // problems during legalization, the emitted instructions to pack and unpack
     // the bytes again are not eliminated in the case of an unaligned copy.
-    if (!allowsMisalignedMemoryAccesses(VT, AS, Alignment.value(),
-                                        LN->getMemOperand()->getFlags(),
-                                        &IsFast)) {
+    if (!allowsMisalignedMemoryAccesses(
+            VT, AS, Alignment, LN->getMemOperand()->getFlags(), &IsFast)) {
       SDValue Ops[2];
 
       if (VT.isVector())
         std::tie(Ops[0], Ops[1]) = scalarizeVectorLoad(LN, DAG);
       else
         std::tie(Ops[0], Ops[1]) = expandUnalignedLoad(LN, DAG);
 
       return DAG.getMergeValues(Ops, SDLoc(N));
SDValue AMDGPUTargetLowering::performStoreCombine(SDNode *N,
   if (Alignment < Size && isTypeLegal(VT)) {
     bool IsFast;
     unsigned AS = SN->getAddressSpace();
 
     // Expand unaligned stores earlier than legalization. Due to visitation
     // order problems during legalization, the emitted instructions to pack and
     // unpack the bytes again are not eliminated in the case of an unaligned
     // copy.
-    if (!allowsMisalignedMemoryAccesses(VT, AS, Alignment.value(),
-                                        SN->getMemOperand()->getFlags(),
-                                        &IsFast)) {
+    if (!allowsMisalignedMemoryAccesses(
+            VT, AS, Alignment, SN->getMemOperand()->getFlags(), &IsFast)) {
       if (VT.isVector())
         return scalarizeVectorStore(SN, DAG);
 
       return expandUnalignedStore(SN, DAG);
     }
 
     if (!IsFast)
       return SDValue();

llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp

static bool isLoadStoreSizeLegal(const GCNSubtarget &ST,
                                  unsigned Opcode) {
   const LLT Ty = Query.Types[0];
 
   // Handle G_LOAD, G_ZEXTLOAD, G_SEXTLOAD
   const bool IsLoad = Opcode != AMDGPU::G_STORE;
 
   unsigned RegSize = Ty.getSizeInBits();
   unsigned MemSize = Query.MMODescrs[0].SizeInBits;
-  unsigned Align = Query.MMODescrs[0].AlignInBits;
+  unsigned AlignInBits = Query.MMODescrs[0].AlignInBits;
   unsigned AS = Query.Types[1].getAddressSpace();
 
   // All of these need to be custom lowered to cast the pointer operand.
   if (AS == AMDGPUAS::CONSTANT_ADDRESS_32BIT)
     return false;
 
   // TODO: We should be able to widen loads if the alignment is high enough, but
   // we also need to modify the memory access size.
 #if 0
   // Accept widening loads based on alignment.
   if (IsLoad && MemSize < Size)
-    MemSize = std::max(MemSize, Align);
+    MemSize = std::max(MemSize, AlignInBits);
 #endif
 
   // Only 1-byte and 2-byte to 32-bit extloads are valid.
   if (MemSize != RegSize && RegSize != 32)
     return false;
 
   if (MemSize > maxSizeForAddrSpace(ST, AS, IsLoad))
     return false;
case 512:
     // These may contextually need to be broken down.
     break;
   default:
     return false;
   }
 
   assert(RegSize >= MemSize);
 
-  if (Align < MemSize) {
+  if (AlignInBits < MemSize) {
     const SITargetLowering *TLI = ST.getTargetLowering();
-    if (!TLI->allowsMisalignedMemoryAccessesImpl(MemSize, AS, Align / 8))
+    if (!TLI->allowsMisalignedMemoryAccessesImpl(MemSize, AS,
+                                                 Align(AlignInBits / 8)))
       return false;
   }
 
   return true;
 }
 
 // The current selector can't handle <6 x s16>, <8 x s16>, s96, s128 etc, so
 // workaround this. Eventually it should ignore the type for loads and only care
getActionDefinitionsBuilder(G_ADDRSPACE_CAST)
     .custom();
 
   const auto needToSplitMemOp = [=](const LegalityQuery &Query,
                                     bool IsLoad) -> bool {
     const LLT DstTy = Query.Types[0];
 
     // Split vector extloads.
     unsigned MemSize = Query.MMODescrs[0].SizeInBits;
-    unsigned Align = Query.MMODescrs[0].AlignInBits;
+    unsigned AlignInBits = Query.MMODescrs[0].AlignInBits;
 
     if (MemSize < DstTy.getSizeInBits())
-      MemSize = std::max(MemSize, Align);
+      MemSize = std::max(MemSize, AlignInBits);
 
     if (DstTy.isVector() && DstTy.getSizeInBits() > MemSize)
       return true;
 
     const LLT PtrTy = Query.Types[1];
     unsigned AS = PtrTy.getAddressSpace();
     if (MemSize > maxSizeForAddrSpace(ST, AS, IsLoad))
       return true;
 
     // Catch weird sized loads that don't evenly divide into the access sizes
     // TODO: May be able to widen depending on alignment etc.
     unsigned NumRegs = (MemSize + 31) / 32;
     if (NumRegs == 3) {
       if (!ST.hasDwordx3LoadStores())
         return true;
     } else {
       // If the alignment allows, these should have been widened.
       if (!isPowerOf2_32(NumRegs))
         return true;
     }
 
-    if (Align < MemSize) {
+    if (AlignInBits < MemSize) {
       const SITargetLowering *TLI = ST.getTargetLowering();
-      return !TLI->allowsMisalignedMemoryAccessesImpl(MemSize, AS, Align / 8);
+      return !TLI->allowsMisalignedMemoryAccessesImpl(MemSize, AS,
+                                                      Align(AlignInBits / 8));
     }
 
     return false;
   };
 
   const auto shouldWidenLoadResult = [=](const LegalityQuery &Query,
                                          unsigned Opc) -> bool {
     unsigned Size = Query.Types[0].getSizeInBits();

llvm/lib/Target/AMDGPU/R600ISelLowering.h

SDValue LowerFormalArguments(SDValue Chain, CallingConv::ID CallConv,
                                SmallVectorImpl<SDValue> &InVals) const override;
   EVT getSetCCResultType(const DataLayout &DL, LLVMContext &,
                          EVT VT) const override;
 
   bool canMergeStoresTo(unsigned AS, EVT MemVT,
                         const SelectionDAG &DAG) const override;
 
   bool allowsMisalignedMemoryAccesses(
-      EVT VT, unsigned AS, unsigned Align,
+      EVT VT, unsigned AS, Align Alignment,
       MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
       bool *IsFast = nullptr) const override;
 
 private:
   unsigned Gen;
   /// Each OpenCL kernel has nine implicit parameters that are stored in the
   /// first nine dwords of a Vertex Buffer.  These implicit parameters are
   /// lowered to load instructions which retrieve the values from the Vertex

llvm/lib/Target/AMDGPU/R600ISelLowering.cpp

if ((AS == AMDGPUAS::PRIVATE_ADDRESS) && TruncatingStore) {
       StoreNode = cast<StoreSDNode>(NewStore);
     }
 
     return scalarizeVectorStore(StoreNode, DAG);
   }
 
   Align Alignment = StoreNode->getAlign();
   if (Alignment < MemVT.getStoreSize() &&
-      !allowsMisalignedMemoryAccesses(MemVT, AS, Alignment.value(),
+      !allowsMisalignedMemoryAccesses(MemVT, AS, Alignment,
                                       StoreNode->getMemOperand()->getFlags(),
                                       nullptr)) {
     return expandUnalignedStore(StoreNode, DAG);
   }
 
   SDValue DWordAddr = DAG.getNode(ISD::SRL, DL, PtrVT, Ptr,
                                   DAG.getConstant(2, DL, PtrVT));
 
bool R600TargetLowering::canMergeStoresTo(unsigned AS, EVT MemVT,
   // Local and Private addresses do not handle vectors. Limit to i32
   if ((AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::PRIVATE_ADDRESS)) {
     return (MemVT.getSizeInBits() <= 32);
   }
   return true;
 }
 
 bool R600TargetLowering::allowsMisalignedMemoryAccesses(
-    EVT VT, unsigned AddrSpace, unsigned Align, MachineMemOperand::Flags Flags,
+    EVT VT, unsigned AddrSpace, Align Alignment, MachineMemOperand::Flags Flags,
     bool *IsFast) const {
   if (IsFast)
     *IsFast = false;
 
   if (!VT.isSimple() || VT == MVT::Other)
     return false;
 
   if (VT.bitsLT(MVT::i32))
     return false;
 
   // TODO: This is a rough estimate.
   if (IsFast)
     *IsFast = true;
 
-  return VT.bitsGT(MVT::i32) && Align % 4 == 0;
+  return VT.bitsGT(MVT::i32) && Alignment >= Align(4);
 }
 
 static SDValue CompactSwizzlableVector(
   SelectionDAG &DAG, SDValue VectorEntry,
   DenseMap<unsigned, unsigned> &RemapSwizzle) {
   assert(RemapSwizzle.empty());
 
   SDLoc DL(VectorEntry);

llvm/lib/Target/AMDGPU/SIISelLowering.h

public:
   bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
                              unsigned AS,
                              Instruction *I = nullptr) const override;
 
   bool canMergeStoresTo(unsigned AS, EVT MemVT,
                         const SelectionDAG &DAG) const override;
 
   bool allowsMisalignedMemoryAccessesImpl(
-      unsigned Size, unsigned AS, unsigned Align,
+      unsigned Size, unsigned AS, Align Alignment,
       MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
       bool *IsFast = nullptr) const;
 
   bool allowsMisalignedMemoryAccesses(
-      EVT VT, unsigned AS, unsigned Align,
+      EVT VT, unsigned AS, Align Alignment,
       MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
       bool *IsFast = nullptr) const override;
 
   EVT getOptimalMemOpType(const MemOp &Op,
                           const AttributeList &FuncAttributes) const override;
 
   bool isMemOpUniform(const SDNode *N) const;
   bool isMemOpHasNoClobberedMemOperand(const SDNode *N) const;

llvm/lib/Target/AMDGPU/SIISelLowering.cpp

if (AS == AMDGPUAS::GLOBAL_ADDRESS || AS == AMDGPUAS::FLAT_ADDRESS) {
     return (MemVT.getSizeInBits() <= MaxPrivateBits);
   } else if (AS == AMDGPUAS::LOCAL_ADDRESS || AS == AMDGPUAS::REGION_ADDRESS) {
     return (MemVT.getSizeInBits() <= 2 * 32);
   }
   return true;
 }
 
 bool SITargetLowering::allowsMisalignedMemoryAccessesImpl(
-    unsigned Size, unsigned AddrSpace, unsigned Align,
+    unsigned Size, unsigned AddrSpace, Align Alignment,
     MachineMemOperand::Flags Flags, bool *IsFast) const {
   if (IsFast)
     *IsFast = false;
 
   if (AddrSpace == AMDGPUAS::LOCAL_ADDRESS ||
       AddrSpace == AMDGPUAS::REGION_ADDRESS) {
     // ds_read/write_b64 require 8-byte alignment, but we can do a 4 byte
     // aligned, 8 byte access in a single operation using ds_read2/write2_b32
     // with adjacent offsets.
-    bool AlignedBy4 = (Align % 4 == 0);
+    bool AlignedBy4 = Alignment >= 4;
     if (IsFast)
       *IsFast = AlignedBy4;
 
     return AlignedBy4;
   }
 
   // FIXME: We have to be conservative here and assume that flat operations
   // will access scratch.  If we had access to the IR function, then we
   // could determine if any private memory was used in the function.
   if (!Subtarget->hasUnalignedScratchAccess() &&
       (AddrSpace == AMDGPUAS::PRIVATE_ADDRESS ||
        AddrSpace == AMDGPUAS::FLAT_ADDRESS)) {
-    bool AlignedBy4 = Align >= 4;
+    bool AlignedBy4 = Alignment >= 4;
     if (IsFast)
       *IsFast = AlignedBy4;
 
     return AlignedBy4;
   }
 
   if (Subtarget->hasUnalignedBufferAccess()) {
     // If we have an uniform constant load, it still requires using a slow
     // buffer instruction if unaligned.
     if (IsFast) {
       // Accesses can really be issued as 1-byte aligned or 4-byte aligned, so
       // 2-byte alignment is worse than 1 unless doing a 2-byte accesss.
       *IsFast = (AddrSpace == AMDGPUAS::CONSTANT_ADDRESS ||
-                 AddrSpace == AMDGPUAS::CONSTANT_ADDRESS_32BIT) ?
-        Align >= 4 : Align != 2;
+                 AddrSpace == AMDGPUAS::CONSTANT_ADDRESS_32BIT)
+                    ? Alignment >= 4
+                    : Alignment != 2;
     }
 
     return true;
   }
 
   // Smaller than dword value must be aligned.
   if (Size < 32)
     return false;
 
   // 8.1.6 - For Dword or larger reads or writes, the two LSBs of the
   // byte-address are ignored, thus forcing Dword alignment.
   // This applies to private, global, and constant memory.
   if (IsFast)
     *IsFast = true;
 
-  return Size >= 32 && Align >= 4;
+  return Size >= 32 && Alignment >= 4;
 }
 
 bool SITargetLowering::allowsMisalignedMemoryAccesses(
-    EVT VT, unsigned AddrSpace, unsigned Align, MachineMemOperand::Flags Flags,
+    EVT VT, unsigned AddrSpace, Align Alignment, MachineMemOperand::Flags Flags,
     bool *IsFast) const {
   if (IsFast)
     *IsFast = false;
 
   // TODO: I think v3i32 should allow unaligned accesses on CI with DS_READ_B96,
   // which isn't a simple VT.
   // Until MVT is extended to handle this, simply check for the size and
   // rely on the condition below: allow accesses if the size is a multiple of 4.
   if (VT == MVT::Other || (VT != MVT::Other && VT.getSizeInBits() > 1024 &&
                            VT.getStoreSize() > 16)) {
     return false;
   }
 
   return allowsMisalignedMemoryAccessesImpl(VT.getSizeInBits(), AddrSpace,
-                                            Align, Flags, IsFast);
+                                            Alignment, Flags, IsFast);
 }
 
 EVT SITargetLowering::getOptimalMemOpType(
     const MemOp &Op, const AttributeList &FuncAttributes) const {
   // FIXME: Should account for address space here.
 
   // The default fallback uses the private pointer size as a guess for a type to
   // use. Make sure we switch these to 64-bit accesses.

llvm/lib/Target/ARM/ARMISelLowering.h

bool SimplifyDemandedBitsForTargetNode(SDValue Op,
                                            unsigned Depth) const override;
 
     bool isDesirableToTransformToIntegerOp(unsigned Opc, EVT VT) const override;
 
     /// allowsMisalignedMemoryAccesses - Returns true if the target allows
     /// unaligned memory accesses of the specified type. Returns whether it
     /// is "fast" by reference in the second argument.
     bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
-                                        unsigned Align,
+                                        Align Alignment,
                                         MachineMemOperand::Flags Flags,
                                         bool *Fast) const override;
 
     EVT getOptimalMemOpType(const MemOp &Op,
                             const AttributeList &FuncAttributes) const override;
 
     bool isTruncateFree(Type *SrcTy, Type *DstTy) const override;
     bool isTruncateFree(EVT SrcVT, EVT DstVT) const override;

llvm/lib/Target/ARM/ARMISelLowering.cpp

 }
 
 bool ARMTargetLowering::isDesirableToTransformToIntegerOp(unsigned Opc,
                                                           EVT VT) const {
   return (VT == MVT::f32) && (Opc == ISD::LOAD || Opc == ISD::STORE);
 }
 
 bool ARMTargetLowering::allowsMisalignedMemoryAccesses(EVT VT, unsigned,
-                                                       unsigned Alignment,
+                                                       Align Alignment,
                                                        MachineMemOperand::Flags,
                                                        bool *Fast) const {
   // Depends what it gets converted into if the type is weird.
   if (!VT.isSimple())
     return false;
 
   // The AllowsUnaligned flag models the SCTLR.A setting in ARM cpus
   bool AllowsUnaligned = Subtarget->allowsUnalignedMem();
if ((Ty == MVT::v16i1 || Ty == MVT::v8i1 || Ty == MVT::v4i1)) {
     if (Fast)
       *Fast = true;
     return true;
   }
 
   // These are for truncated stores/narrowing loads. They are fine so long as
   // the alignment is at least the size of the item being loaded
   if ((Ty == MVT::v4i8 || Ty == MVT::v8i8 || Ty == MVT::v4i16) &&
       Alignment >= VT.getScalarSizeInBits() / 8) {
     if (Fast)
       *Fast = true;
     return true;
   }
 
   // In little-endian MVE, the store instructions VSTRB.U8, VSTRH.U16 and
   // VSTRW.U32 all store the vector register in exactly the same format, and
   // differ only in the range of their immediate offset field and the required
if (Ty == MVT::v16i8 || Ty == MVT::v8i16 || Ty == MVT::v8f16 ||
     if (Fast)
       *Fast = true;
     return true;
   }
 
   return false;
 }
 
-
 EVT ARMTargetLowering::getOptimalMemOpType(
     const MemOp &Op, const AttributeList &FuncAttributes) const {
   // See if we can use NEON instructions for this...
   if ((Op.isMemcpy() || Op.isZeroMemset()) && Subtarget->hasNEON() &&
       !FuncAttributes.hasFnAttribute(Attribute::NoImplicitFloat)) {
     bool Fast;
     if (Op.size() >= 16 &&
         (Op.isAligned(Align(16)) ||
-         (allowsMisalignedMemoryAccesses(MVT::v2f64, 0, 1,
+         (allowsMisalignedMemoryAccesses(MVT::v2f64, 0, Align(1),
                                          MachineMemOperand::MONone, &Fast) &&
           Fast))) {
       return MVT::v2f64;
     } else if (Op.size() >= 8 &&
                (Op.isAligned(Align(8)) ||
                 (allowsMisalignedMemoryAccesses(
-                     MVT::f64, 0, 1, MachineMemOperand::MONone, &Fast) &&
+                     MVT::f64, 0, Align(1), MachineMemOperand::MONone, &Fast) &&
                  Fast))) {
       return MVT::f64;
     }
   }
 
   // Let the target-independent logic figure it out.
   return MVT::Other;
 }

llvm/lib/Target/Hexagon/HexagonISelLowering.h

EVT getOptimalMemOpType(const MemOp &Op,
                             const AttributeList &FuncAttributes) const override;
 
     bool allowsMemoryAccess(LLVMContext &Context, const DataLayout &DL, EVT VT,
                             unsigned AddrSpace, Align Alignment,
                             MachineMemOperand::Flags Flags,
                             bool *Fast) const override;
 
     bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
-        unsigned Alignment, MachineMemOperand::Flags Flags, bool *Fast)
-        const override;
+                                        Align Alignment,
+                                        MachineMemOperand::Flags Flags,
+                                        bool *Fast) const override;
 
     /// Returns relocation base for the given PIC jumptable.
     SDValue getPICJumpTableRelocBase(SDValue Table, SelectionDAG &DAG)
                                      const override;
 
     bool shouldReduceLoadWidth(SDNode *Load, ISD::LoadExtType ExtTy,
                                EVT NewVT) const override;
 

llvm/lib/Target/Hexagon/HexagonISelLowering.cpp

bool HexagonTargetLowering::allowsMemoryAccess(
   MVT SVT = VT.getSimpleVT();
   if (Subtarget.isHVXVectorType(SVT, true))
     return allowsHvxMemoryAccess(SVT, Flags, Fast);
   return TargetLoweringBase::allowsMemoryAccess(
               Context, DL, VT, AddrSpace, Alignment, Flags, Fast);
 }
 
 bool HexagonTargetLowering::allowsMisalignedMemoryAccesses(
-      EVT VT, unsigned AddrSpace, unsigned Alignment,
-      MachineMemOperand::Flags Flags, bool *Fast) const {
+    EVT VT, unsigned AddrSpace, Align Alignment, MachineMemOperand::Flags Flags,
+    bool *Fast) const {
   MVT SVT = VT.getSimpleVT();
   if (Subtarget.isHVXVectorType(SVT, true))
     return allowsHvxMisalignedMemoryAccesses(SVT, Flags, Fast);
   if (Fast)
     *Fast = false;
   return false;
 }
 

llvm/lib/Target/Mips/Mips16ISelLowering.h

 
 namespace llvm {
   class Mips16TargetLowering : public MipsTargetLowering  {
   public:
     explicit Mips16TargetLowering(const MipsTargetMachine &TM,
                                   const MipsSubtarget &STI);
 
     bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
-                                        unsigned Align,
+                                        Align Alignment,
                                         MachineMemOperand::Flags Flags,
                                         bool *Fast) const override;
 
     MachineBasicBlock *
     EmitInstrWithCustomInserter(MachineInstr &MI,
                                 MachineBasicBlock *MBB) const override;
 
   private:

llvm/lib/Target/Mips/Mips16ISelLowering.cpp

 
 const MipsTargetLowering *
 llvm::createMips16TargetLowering(const MipsTargetMachine &TM,
                                  const MipsSubtarget &STI) {
   return new Mips16TargetLowering(TM, STI);
 }
 
 bool Mips16TargetLowering::allowsMisalignedMemoryAccesses(
-    EVT VT, unsigned, unsigned, MachineMemOperand::Flags, bool *Fast) const {
+    EVT VT, unsigned, Align, MachineMemOperand::Flags, bool *Fast) const {
   return false;
 }
 
 MachineBasicBlock *
 Mips16TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI,
                                                   MachineBasicBlock *BB) const {
   switch (MI.getOpcode()) {
   default:

llvm/lib/Target/Mips/MipsSEISelLowering.h

public:
     void addMSAIntType(MVT::SimpleValueType Ty, const TargetRegisterClass *RC);
 
     /// Enable MSA support for the given floating-point type and
     /// Register class.
     void addMSAFloatType(MVT::SimpleValueType Ty,
                          const TargetRegisterClass *RC);
 
     bool allowsMisalignedMemoryAccesses(
-        EVT VT, unsigned AS = 0, unsigned Align = 1,
+        EVT VT, unsigned AS = 0, Align Alignment = Align(1),
         MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
         bool *Fast = nullptr) const override;
 
     SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
 
     SDValue PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI) const override;
 
     MachineBasicBlock *

llvm/lib/Target/Mips/MipsSEISelLowering.cpp

SDValue MipsSETargetLowering::lowerSELECT(SDValue Op, SelectionDAG &DAG) const {
   // floating point register are undefined. Not really an issue as sel.d, which
   // is produced from an FSELECT node, only looks at bit 0.
   SDValue Tmp = DAG.getNode(MipsISD::MTC1_D64, DL, MVT::f64, Op->getOperand(0));
   return DAG.getNode(MipsISD::FSELECT, DL, ResTy, Tmp, Op->getOperand(1),
                      Op->getOperand(2));
 }
 
 bool MipsSETargetLowering::allowsMisalignedMemoryAccesses(
-    EVT VT, unsigned, unsigned, MachineMemOperand::Flags, bool *Fast) const {
+    EVT VT, unsigned, Align, MachineMemOperand::Flags, bool *Fast) const {
   MVT::SimpleValueType SVT = VT.getSimpleVT().SimpleTy;
 
   if (Subtarget.systemSupportsUnalignedAccess()) {
     // MIPS32r6/MIPS64r6 is required to support unaligned access. It's
     // implementation defined whether this is handled by hardware, software, or
     // a hybrid of the two but it's expected that most implementations will
     // handle the majority of cases in hardware.
     if (Fast)

llvm/lib/Target/PowerPC/PPCISelLowering.h

public:
     /// It returns EVT::Other if the type should be determined using generic
     /// target-independent logic.
     EVT getOptimalMemOpType(const MemOp &Op,
                             const AttributeList &FuncAttributes) const override;
 
     /// Is unaligned memory access allowed for the given type, and is it fast
     /// relative to software emulation.
     bool allowsMisalignedMemoryAccesses(
-        EVT VT, unsigned AddrSpace, unsigned Align = 1,
+        EVT VT, unsigned AddrSpace, Align Alignment = Align(1),
         MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
         bool *Fast = nullptr) const override;
 
     /// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
     /// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
     /// expanded to FMAs when this method returns true, otherwise fmuladd is
     /// expanded to fmul + fadd.
     bool isFMAFasterThanFMulAndFAdd(const MachineFunction &MF,

llvm/lib/Target/PowerPC/PPCISelLowering.cpp

 bool PPCTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
   return isInt<16>(Imm) || isUInt<16>(Imm);
 }
 
 bool PPCTargetLowering::isLegalAddImmediate(int64_t Imm) const {
   return isInt<16>(Imm) || isUInt<16>(Imm);
 }
 
-bool PPCTargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
-                                                       unsigned,
-                                                       unsigned,
+bool PPCTargetLowering::allowsMisalignedMemoryAccesses(EVT VT, unsigned, Align,
                                                        MachineMemOperand::Flags,
                                                        bool *Fast) const {
   if (DisablePPCUnaligned)
     return false;
 
   // PowerPC supports unaligned memory access for simple non-vector types.
   // Although accessing unaligned addresses is not as efficient as accessing
   // aligned addresses, it is generally more efficient than manual expansion,

llvm/lib/Target/SystemZ/SystemZISelLowering.h

public:
   bool isFPImmLegal(const APFloat &Imm, EVT VT,
                     bool ForCodeSize) const override;
   bool hasInlineStackProbe(MachineFunction &MF) const override;
   bool isLegalICmpImmediate(int64_t Imm) const override;
   bool isLegalAddImmediate(int64_t Imm) const override;
   bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
                              unsigned AS,
                              Instruction *I = nullptr) const override;
-  bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS,
-                                      unsigned Align,
+  bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, Align Alignment,
                                       MachineMemOperand::Flags Flags,
                                       bool *Fast) const override;
   bool isTruncateFree(Type *, Type *) const override;
   bool isTruncateFree(EVT, EVT) const override;
 
   bool shouldFormOverflowOp(unsigned Opcode, EVT VT,
                             bool MathUsed) const override {
     // Form add and sub with overflow intrinsics regardless of any extra

llvm/lib/Target/SystemZ/SystemZISelLowering.cpp

 }
 
 bool SystemZTargetLowering::isLegalAddImmediate(int64_t Imm) const {
   // We can use ALGFI or SLGFI.
   return isUInt<32>(Imm) || isUInt<32>(-Imm);
 }
 
 bool SystemZTargetLowering::allowsMisalignedMemoryAccesses(
-    EVT VT, unsigned, unsigned, MachineMemOperand::Flags, bool *Fast) const {
+    EVT VT, unsigned, Align, MachineMemOperand::Flags, bool *Fast) const {
   // Unaligned accesses should never be slower than the expanded version.
   // We check specifically for aligned accesses in the few cases where
   // they are required.
   if (Fast)
     *Fast = true;
   return true;
 }
 

llvm/lib/Target/VE/VEISelLowering.h

public:
   SDValue makeHiLoPair(SDValue Op, unsigned HiTF, unsigned LoTF,
                        SelectionDAG &DAG) const;
   SDValue makeAddress(SDValue Op, SelectionDAG &DAG) const;
 
   bool isFPImmLegal(const APFloat &Imm, EVT VT,
                     bool ForCodeSize) const override;
   /// Returns true if the target allows unaligned memory accesses of the
   /// specified type.
-  bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, unsigned Align,
+  bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, Align Alignment,
                                       MachineMemOperand::Flags Flags,
                                       bool *Fast) const override;
 
   // Block s/udiv lowering for now
   bool isIntDivCheap(EVT VT, AttributeList Attr) const override { return true; }
 
   bool hasAndNot(SDValue Y) const override;
 };
 } // namespace llvm
 
 #endif // VE_ISELLOWERING_H

llvm/lib/Target/VE/VEISelLowering.cpp

 /// of the specified type in the given address space. If true, it also returns
 /// whether the unaligned memory access is "fast" in the last argument by
 /// reference. This is used, for example, in situations where an array
 /// copy/move/set is converted to a sequence of store operations. Its use
 /// helps to ensure that such replacements don't generate code that causes an
 /// alignment error (trap) on the target machine.
 bool VETargetLowering::allowsMisalignedMemoryAccesses(EVT VT,
                                                       unsigned AddrSpace,
-                                                      unsigned Align,
+                                                      Align Alignment,
                                                       MachineMemOperand::Flags,
                                                       bool *Fast) const {
   if (Fast) {
     // It's fast anytime on VE
     *Fast = true;
   }
   return true;
 }

llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.h

private:
   std::pair<unsigned, const TargetRegisterClass *>
   getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
                                StringRef Constraint, MVT VT) const override;
   bool isCheapToSpeculateCttz() const override;
   bool isCheapToSpeculateCtlz() const override;
   bool isLegalAddressingMode(const DataLayout &DL, const AddrMode &AM, Type *Ty,
                              unsigned AS,
                              Instruction *I = nullptr) const override;
-  bool allowsMisalignedMemoryAccesses(EVT, unsigned AddrSpace, unsigned Align,
+  bool allowsMisalignedMemoryAccesses(EVT, unsigned AddrSpace, Align Alignment,
                                       MachineMemOperand::Flags Flags,
                                       bool *Fast) const override;
   bool isIntDivCheap(EVT VT, AttributeList Attr) const override;
   bool isVectorLoadExtDesirable(SDValue ExtVal) const override;
   EVT getSetCCResultType(const DataLayout &DL, LLVMContext &Context,
                          EVT VT) const override;
   bool getTgtMemIntrinsic(IntrinsicInfo &Info, const CallInst &I,
                           MachineFunction &MF,

llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp

bool WebAssemblyTargetLowering::isLegalAddressingMode(const DataLayout &DL,
   if (AM.Scale != 0)
     return false;
 
   // Everything else is legal.
   return true;
 }
 
 bool WebAssemblyTargetLowering::allowsMisalignedMemoryAccesses(
-    EVT /*VT*/, unsigned /*AddrSpace*/, unsigned /*Align*/,
+    EVT /*VT*/, unsigned /*AddrSpace*/, Align /*Alignment*/,
     MachineMemOperand::Flags /*Flags*/, bool *Fast) const {
   // WebAssembly supports unaligned accesses, though it should be declared
   // with the p2align attribute on loads and stores which do so, and there
   // may be a performance impact. We tell LLVM they're "fast" because
   // for the kinds of things that LLVM uses this for (merging adjacent stores
   // of constants, etc.), WebAssembly implementations will either want the
   // unaligned access or they'll split anyway.
   if (Fast)

llvm/lib/Target/X86/X86ISelLowering.h

public:
     /// for all types except for some special cases. For example, on X86
     /// targets without SSE2 f64 load / store are done with fldl / fstpl which
     /// also does type conversion. Note the specified type doesn't have to be
     /// legal as the hook is used before type legalization.
     bool isSafeMemOpType(MVT VT) const override;
 
     /// Returns true if the target allows unaligned memory accesses of the
     /// specified type. Returns whether it is "fast" in the last argument.
-    bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, unsigned Align,
+    bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AS, Align Alignment,
                                         MachineMemOperand::Flags Flags,
                                         bool *Fast) const override;
 
     /// Provide custom lowering hooks for some operations.
     ///
     SDValue LowerOperation(SDValue Op, SelectionDAG &DAG) const override;
 
     /// Places new result values for the node in Results (their number

llvm/lib/Target/X86/X86ISelLowering.cpp

bool X86TargetLowering::isSafeMemOpType(MVT VT) const {
   if (VT == MVT::f32)
     return X86ScalarSSEf32;
   else if (VT == MVT::f64)
     return X86ScalarSSEf64;
   return true;
 }
 
 bool X86TargetLowering::allowsMisalignedMemoryAccesses(
-    EVT VT, unsigned, unsigned Align, MachineMemOperand::Flags Flags,
+    EVT VT, unsigned, Align Alignment, MachineMemOperand::Flags Flags,
     bool *Fast) const {
   if (Fast) {
     switch (VT.getSizeInBits()) {
     default:
       // 8-byte and under are always assumed to be fast.
       *Fast = true;
       break;
     case 128:
       *Fast = !Subtarget.isUnalignedMem16Slow();
       break;
     case 256:
       *Fast = !Subtarget.isUnalignedMem32Slow();
       break;
     // TODO: What about AVX-512 (512-bit) accesses?
     }
   }
   // NonTemporal vector memory ops must be aligned.
   if (!!(Flags & MachineMemOperand::MONonTemporal) && VT.isVector()) {
     // NT loads can only be vector aligned, so if its less aligned than the
     // minimum vector size (which we can split the vector down to), we might as
     // well use a regular unaligned vector load.
     // We don't have any NT loads pre-SSE41.
     if (!!(Flags & MachineMemOperand::MOLoad))
-      return (Align < 16 || !Subtarget.hasSSE41());
+      return (Alignment < 16 || !Subtarget.hasSSE41());
     return false;
   }
   // Misaligned accesses of any size are always allowed.
   return true;
 }
 
 /// Return the entry encoding for a jump table in the
 /// current function.  The returned value is a member of the

llvm/lib/Transforms/Vectorize/LoadStoreVectorizer.cpp

 bool Vectorizer::accessIsMisaligned(unsigned SzInBytes, unsigned AddressSpace,
                                     unsigned Alignment) {
   if (Alignment % SzInBytes == 0)
     return false;
 
   bool Fast = false;
   bool Allows = TTI.allowsMisalignedMemoryAccesses(F.getParent()->getContext(),
                                                    SzInBytes * 8, AddressSpace,
-                                                   Alignment, &Fast);
+                                                   Align(Alignment), &Fast);
   LLVM_DEBUG(dbgs() << "LSV: Target said misaligned is allowed? " << Allows
                     << " and fast? " << Fast << "\n";);
   return !Allows || !Fast;
 }