diff --git a/llvm/include/llvm/CodeGen/TargetLowering.h b/llvm/include/llvm/CodeGen/TargetLowering.h
--- a/llvm/include/llvm/CodeGen/TargetLowering.h
+++ b/llvm/include/llvm/CodeGen/TargetLowering.h
@@ -1609,7 +1609,7 @@
   /// target).
   virtual bool
   allowsMemoryAccess(LLVMContext &Context, const DataLayout &DL, EVT VT,
-                     unsigned AddrSpace = 0, unsigned Alignment = 1,
+                     unsigned AddrSpace = 0, Align Alignment = Align(1),
                      MachineMemOperand::Flags Flags = MachineMemOperand::MONone,
                      bool *Fast = nullptr) const;
 
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -4862,7 +4862,7 @@
   // Ensure that this isn't going to produce an unsupported memory access.
   if (ShAmt &&
       !TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), MemVT,
-                              LDST->getAddressSpace(), ShAmt / 8,
+                              LDST->getAddressSpace(), Align(ShAmt / 8),
                               LDST->getMemOperand()->getFlags()))
     return false;
 
@@ -8478,7 +8478,7 @@
           SDLoc DL(RHS);
           uint64_t PtrOff =
               IsFSHL ? (((BitWidth - ShAmt) % BitWidth) / 8) : (ShAmt / 8);
-          unsigned NewAlign = MinAlign(RHS->getAlignment(), PtrOff);
+          const Align NewAlign = commonAlignment(RHS->getAlign(), PtrOff);
           bool Fast = false;
           if (TLI.allowsMemoryAccess(*DAG.getContext(), DAG.getDataLayout(), VT,
                                      RHS->getAddressSpace(), NewAlign,
diff --git a/llvm/lib/CodeGen/TargetLoweringBase.cpp b/llvm/lib/CodeGen/TargetLoweringBase.cpp
--- a/llvm/lib/CodeGen/TargetLoweringBase.cpp
+++ b/llvm/lib/CodeGen/TargetLoweringBase.cpp
@@ -1599,19 +1599,21 @@
                                         Fast);
 }
 
-bool TargetLoweringBase::allowsMemoryAccess(
-    LLVMContext &Context, const DataLayout &DL, EVT VT, unsigned AddrSpace,
-    unsigned Alignment, MachineMemOperand::Flags Flags, bool *Fast) const {
-  return allowsMemoryAccessForAlignment(Context, DL, VT, AddrSpace, Alignment,
-                                        Flags, Fast);
+bool TargetLoweringBase::allowsMemoryAccess(LLVMContext &Context,
+                                            const DataLayout &DL, EVT VT,
+                                            unsigned AddrSpace, Align Alignment,
+                                            MachineMemOperand::Flags Flags,
+                                            bool *Fast) const {
+  return allowsMemoryAccessForAlignment(Context, DL, VT, AddrSpace,
+                                        Alignment.value(), Flags, Fast);
 }
 
 bool TargetLoweringBase::allowsMemoryAccess(LLVMContext &Context,
                                             const DataLayout &DL, EVT VT,
                                             const MachineMemOperand &MMO,
                                             bool *Fast) const {
-  return allowsMemoryAccess(Context, DL, VT, MMO.getAddrSpace(),
-                            MMO.getAlign().value(), MMO.getFlags(), Fast);
+  return allowsMemoryAccess(Context, DL, VT, MMO.getAddrSpace(), MMO.getAlign(),
+                            MMO.getFlags(), Fast);
 }
 
 BranchProbability TargetLoweringBase::getPredictableBranchThreshold() const {
diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.h b/llvm/lib/Target/Hexagon/HexagonISelLowering.h
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.h
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.h
@@ -306,8 +306,9 @@
                             const AttributeList &FuncAttributes) const override;
 
     bool allowsMemoryAccess(LLVMContext &Context, const DataLayout &DL, EVT VT,
-        unsigned AddrSpace, unsigned Alignment, MachineMemOperand::Flags Flags,
-        bool *Fast) const override;
+                            unsigned AddrSpace, Align Alignment,
+                            MachineMemOperand::Flags Flags,
+                            bool *Fast) const override;
 
     bool allowsMisalignedMemoryAccesses(EVT VT, unsigned AddrSpace,
         unsigned Alignment, MachineMemOperand::Flags Flags, bool *Fast)
diff --git a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -3385,12 +3385,12 @@
   return MVT::Other;
 }
 
-bool HexagonTargetLowering::allowsMemoryAccess(LLVMContext &Context,
-      const DataLayout &DL, EVT VT, unsigned AddrSpace, unsigned Alignment,
-      MachineMemOperand::Flags Flags, bool *Fast) const {
+bool HexagonTargetLowering::allowsMemoryAccess(
+    LLVMContext &Context, const DataLayout &DL, EVT VT, unsigned AddrSpace,
+    Align Alignment, MachineMemOperand::Flags Flags, bool *Fast) const {
   MVT SVT = VT.getSimpleVT();
   if (Subtarget.isHVXVectorType(SVT, true))
-    return allowsHvxMemoryAccess(SVT, Alignment, Flags, Fast);
+    return allowsHvxMemoryAccess(SVT, Alignment.value(), Flags, Fast);
   return TargetLoweringBase::allowsMemoryAccess(
               Context, DL, VT, AddrSpace, Alignment, Flags, Fast);
 }