diff --git a/llvm/include/llvm/IR/DataLayout.h b/llvm/include/llvm/IR/DataLayout.h
--- a/llvm/include/llvm/IR/DataLayout.h
+++ b/llvm/include/llvm/IR/DataLayout.h
@@ -29,6 +29,7 @@
 #include "llvm/Support/Casting.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/MathExtras.h"
+#include "llvm/Support/Alignment.h"
 #include <cassert>
 #include <cstdint>
 #include <string>
@@ -120,10 +121,10 @@
   bool BigEndian;
 
   unsigned AllocaAddrSpace;
-  unsigned StackNaturalAlign;
+  MaybeAlign StackNaturalAlign;
   unsigned ProgramAddrSpace;
 
-  unsigned FunctionPtrAlign;
+  MaybeAlign FunctionPtrAlign;
   FunctionPtrAlignType TheFunctionPtrAlignType;
 
   enum ManglingModeT {
@@ -261,17 +262,17 @@
   bool isIllegalInteger(uint64_t Width) const { return !isLegalInteger(Width); }
 
   /// Returns true if the given alignment exceeds the natural stack alignment.
-  bool exceedsNaturalStackAlignment(unsigned Align) const {
-    return (StackNaturalAlign != 0) && (Align > StackNaturalAlign);
+  bool exceedsNaturalStackAlignment(llvm::Align Align) const {
+    return StackNaturalAlign && (Align > StackNaturalAlign);
   }
 
-  unsigned getStackAlignment() const { return StackNaturalAlign; }
+  unsigned getStackAlignment() const { return StackNaturalAlign ? StackNaturalAlign->value() : 0; }
   unsigned getAllocaAddrSpace() const { return AllocaAddrSpace; }
 
   /// Returns the alignment of function pointers, which may or may not be
   /// related to the alignment of functions.
   /// \see getFunctionPtrAlignType
-  unsigned getFunctionPtrAlign() const { return FunctionPtrAlign; }
+  MaybeAlign getFunctionPtrAlign() const { return FunctionPtrAlign; }
 
   /// Return the type of function pointer alignment.
   /// \see getFunctionPtrAlign
diff --git a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
--- a/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/CombinerHelper.cpp
@@ -698,7 +698,7 @@
     const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
     if (!TRI->needsStackRealignment(MF))
       while (NewAlign > Align &&
-             DL.exceedsNaturalStackAlignment(NewAlign))
+             DL.exceedsNaturalStackAlignment(llvm::Align(NewAlign)))
           NewAlign /= 2;
 
     if (NewAlign > Align) {
@@ -804,7 +804,7 @@
     const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
     if (!TRI->needsStackRealignment(MF))
       while (NewAlign > Align &&
-             DL.exceedsNaturalStackAlignment(NewAlign))
+             DL.exceedsNaturalStackAlignment(llvm::Align(NewAlign)))
           NewAlign /= 2;
 
     if (NewAlign > Align) {
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -5804,7 +5804,7 @@
     const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
     if (!TRI->needsStackRealignment(MF))
       while (NewAlign > Align &&
-             DL.exceedsNaturalStackAlignment(NewAlign))
+             DL.exceedsNaturalStackAlignment(llvm::Align(NewAlign)))
           NewAlign /= 2;
 
     if (NewAlign > Align) {
diff --git a/llvm/lib/IR/DataLayout.cpp b/llvm/lib/IR/DataLayout.cpp
--- a/llvm/lib/IR/DataLayout.cpp
+++ b/llvm/lib/IR/DataLayout.cpp
@@ -182,9 +182,9 @@
   LayoutMap = nullptr;
   BigEndian = false;
   AllocaAddrSpace = 0;
-  StackNaturalAlign = 0;
+  StackNaturalAlign.reset();
   ProgramAddrSpace = 0;
-  FunctionPtrAlign = 0;
+  FunctionPtrAlign.reset();
   TheFunctionPtrAlignType = FunctionPtrAlignType::Independent;
   ManglingMode = MM_None;
   NonIntegralAddressSpaces.clear();
@@ -378,7 +378,7 @@
       }
       break;
     case 'S': { // Stack natural alignment.
-      StackNaturalAlign = inBytes(getInt(Tok));
+      StackNaturalAlign = MaybeAlign(inBytes(getInt(Tok)));
       break;
     }
     case 'F': {
@@ -394,7 +394,7 @@
                            "datalayout string");
       }
       Tok = Tok.substr(1);
-      FunctionPtrAlign = inBytes(getInt(Tok));
+      FunctionPtrAlign = MaybeAlign(inBytes(getInt(Tok)));
       break;
     }
     case 'P': { // Function address space.
diff --git a/llvm/lib/IR/Value.cpp b/llvm/lib/IR/Value.cpp
--- a/llvm/lib/IR/Value.cpp
+++ b/llvm/lib/IR/Value.cpp
@@ -685,11 +685,13 @@
   unsigned Align = 0;
   if (auto *GO = dyn_cast<GlobalObject>(this)) {
     if (isa<Function>(GO)) {
+      MaybeAlign FunctionPtrAlign = DL.getFunctionPtrAlign();
+      unsigned Align = FunctionPtrAlign ? FunctionPtrAlign->value() : 0;
       switch (DL.getFunctionPtrAlignType()) {
       case DataLayout::FunctionPtrAlignType::Independent:
-        return DL.getFunctionPtrAlign();
+        return Align;
       case DataLayout::FunctionPtrAlignType::MultipleOfFunctionAlign:
-        return std::max(DL.getFunctionPtrAlign(), GO->getAlignment());
+        return std::max(Align, GO->getAlignment());
       }
     }
     Align = GO->getAlignment();
diff --git a/llvm/lib/Transforms/Utils/Local.cpp b/llvm/lib/Transforms/Utils/Local.cpp
--- a/llvm/lib/Transforms/Utils/Local.cpp
+++ b/llvm/lib/Transforms/Utils/Local.cpp
@@ -1152,7 +1152,7 @@
 
     // If the preferred alignment is greater than the natural stack alignment
     // then don't round up. This avoids dynamic stack realignment.
-    if (DL.exceedsNaturalStackAlignment(PrefAlign))
+    if (DL.exceedsNaturalStackAlignment(llvm::Align(PrefAlign)))
       return Align;
     AI->setAlignment(PrefAlign);
     return PrefAlign;
diff --git a/llvm/unittests/IR/DataLayoutTest.cpp b/llvm/unittests/IR/DataLayoutTest.cpp
--- a/llvm/unittests/IR/DataLayoutTest.cpp
+++ b/llvm/unittests/IR/DataLayoutTest.cpp
@@ -14,15 +14,15 @@
 namespace {
 
 TEST(DataLayoutTest, FunctionPtrAlign) {
-  EXPECT_EQ(0U, DataLayout("").getFunctionPtrAlign());
-  EXPECT_EQ(1U, DataLayout("Fi8").getFunctionPtrAlign());
-  EXPECT_EQ(2U, DataLayout("Fi16").getFunctionPtrAlign());
-  EXPECT_EQ(4U, DataLayout("Fi32").getFunctionPtrAlign());
-  EXPECT_EQ(8U, DataLayout("Fi64").getFunctionPtrAlign());
-  EXPECT_EQ(1U, DataLayout("Fn8").getFunctionPtrAlign());
-  EXPECT_EQ(2U, DataLayout("Fn16").getFunctionPtrAlign());
-  EXPECT_EQ(4U, DataLayout("Fn32").getFunctionPtrAlign());
-  EXPECT_EQ(8U, DataLayout("Fn64").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(0), DataLayout("").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(1), DataLayout("Fi8").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(2), DataLayout("Fi16").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(4), DataLayout("Fi32").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(8), DataLayout("Fi64").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(1), DataLayout("Fn8").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(2), DataLayout("Fn16").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(4), DataLayout("Fn32").getFunctionPtrAlign());
+  EXPECT_EQ(MaybeAlign(8), DataLayout("Fn64").getFunctionPtrAlign());
   EXPECT_EQ(DataLayout::FunctionPtrAlignType::Independent, \
       DataLayout("").getFunctionPtrAlignType());
   EXPECT_EQ(DataLayout::FunctionPtrAlignType::Independent, \