diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
@@ -185,9 +185,12 @@
   else
     addGlobalName(GV->getName(), *VariableDIE, DeclContext);
 
-  if (uint32_t AlignInBytes = GV->getAlignInBytes())
-    addUInt(*VariableDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
-            AlignInBytes);
+  // DW_AT_alignment was introduced in DWARF 5, in strict DWARF mode, only
+  // generate this attribute when the DWARF version is not smaller than 5.
+  if (!Asm->TM.Options.DebugStrictDwarf || DD->getDwarfVersion() >= 5)
+    if (uint32_t AlignInBytes = GV->getAlignInBytes())
+      addUInt(*VariableDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
+              AlignInBytes);
 
   if (MDTuple *TP = GV->getTemplateParams())
     addTemplateParams(*VariableDIE, DINodeArray(TP));
@@ -1481,7 +1484,10 @@
   if (!Name.empty())
     addString(VariableDie, dwarf::DW_AT_name, Name);
   const auto *DIVar = Var.getVariable();
-  if (DIVar)
+  // DW_AT_alignment was introduced in DWARF 5, in strict DWARF mode, only
+  // generate this attribute when the DWARF version is not smaller than 5.
+  if (DIVar &&
+      (!Asm->TM.Options.DebugStrictDwarf || DD->getDwarfVersion() >= 5))
     if (uint32_t AlignInBytes = DIVar->getAlignInBytes())
       addUInt(VariableDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
               AlignInBytes);
diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
@@ -992,9 +992,12 @@
               RLang);
 
     // Add align info if available.
-    if (uint32_t AlignInBytes = CTy->getAlignInBytes())
-      addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
-              AlignInBytes);
+    // DW_AT_alignment was introduced in DWARF 5, in strict DWARF mode, only
+    // generate this attribute when the DWARF version is not smaller than 5.
+    if (!Asm->TM.Options.DebugStrictDwarf || DD->getDwarfVersion() >= 5)
+      if (uint32_t AlignInBytes = CTy->getAlignInBytes())
+        addUInt(Buffer, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
+                AlignInBytes);
   }
 }
 
@@ -1613,7 +1616,10 @@
     } else {
       // This is not a bitfield.
       OffsetInBytes = DT->getOffsetInBits() / 8;
-      if (AlignInBytes)
+      // DW_AT_alignment was introduced in DWARF 5, in strict DWARF mode, only
+      // generate this attribute when the DWARF version is not smaller than 5.
+      if (AlignInBytes &&
+          (!Asm->TM.Options.DebugStrictDwarf || DD->getDwarfVersion() >= 5))
         addUInt(MemberDie, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
                 AlignInBytes);
     }
@@ -1694,9 +1700,12 @@
   if (const ConstantFP *CFP = dyn_cast_or_null<ConstantFP>(DT->getConstant()))
     addConstantFPValue(StaticMemberDIE, CFP);
 
-  if (uint32_t AlignInBytes = DT->getAlignInBytes())
-    addUInt(StaticMemberDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
-            AlignInBytes);
+  // DW_AT_alignment was introduced in DWARF 5, in strict DWARF mode, only
+  // generate this attribute when the DWARF version is not smaller than 5.
+  if (!Asm->TM.Options.DebugStrictDwarf || DD->getDwarfVersion() >= 5)
+    if (uint32_t AlignInBytes = DT->getAlignInBytes())
+      addUInt(StaticMemberDIE, dwarf::DW_AT_alignment, dwarf::DW_FORM_udata,
+              AlignInBytes);
 
   return &StaticMemberDIE;
 }
diff --git a/llvm/test/DebugInfo/PowerPC/alignment.ll b/llvm/test/DebugInfo/PowerPC/alignment.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/DebugInfo/PowerPC/alignment.ll
@@ -0,0 +1,37 @@
+; RUN: llc -filetype=obj -mtriple=powerpc64le-unknown-linux-gnu < %s | \
+; RUN:   llvm-dwarfdump -debug-info - | FileCheck %s
+; RUN: llc -filetype=obj -mtriple=powerpc64le-unknown-linux-gnu \
+; RUN:   -strict-dwarf=true < %s | llvm-dwarfdump -debug-info - | \
+; RUN:   FileCheck %s --check-prefix=STRICT
+
+; CHECK: DW_AT_alignment
+; STRICT-NOT: DW_AT_alignment
+
+@_ZL3var = internal global i32 0, align 16, !dbg !0
+
+define dso_local signext i32 @_Z3foov() #0 !dbg !11 {
+  %1 = load i32, i32* @_ZL3var, align 16, !dbg !15
+  ret i32 %1, !dbg !16
+}
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "var", linkageName: "_ZL3var", scope: !2, file: !3, line: 1, type: !6, isLocal: true, isDefinition: true, align: 128)
+!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 13.0.0", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
+!3 = !DIFile(filename: "align.cpp", directory: "./")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
+!7 = !{i32 7, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 13.0.0"}
+!11 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !3, file: !3, line: 3, type: !12, scopeLine: 4, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !2, retainedNodes: !4)
+!12 = !DISubroutineType(types: !13)
+!13 = !{!14}
+!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!15 = !DILocation(line: 5, column: 18, scope: !11)
+!16 = !DILocation(line: 5, column: 11, scope: !11)