diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMAttrDefs.td
@@ -122,6 +122,15 @@
   "tag", /*default=*/"", "Tag"
 >;
 
+//===----------------------------------------------------------------------===//
+// DIVoidResultTypeAttr
+//===----------------------------------------------------------------------===//
+
+def LLVM_DIVoidResultTypeAttr : LLVM_Attr<"DIVoidResultType", "di_void_result_type",
+                                          /*traits=*/[], "DITypeAttr"> {
+  let parameters = (ins);
+}
+
 //===----------------------------------------------------------------------===//
 // DIBasicTypeAttr
 //===----------------------------------------------------------------------===//
@@ -353,16 +362,15 @@
   ], "DITypeAttr"> {
   let parameters = (ins
     LLVM_DICallingConventionParameter:$callingConvention,
-    OptionalParameter<"DITypeAttr">:$resultType,
-    OptionalArrayRefParameter<"DITypeAttr">:$argumentTypes
+    OptionalArrayRefParameter<"DITypeAttr">:$types
   );
   let builders = [
-    TypeBuilder<(ins "DITypeAttr":$resultType,
-                     "ArrayRef<DITypeAttr>":$argumentTypes), [{
-      return $_get($_ctxt, /*callingConvention=*/0, resultType, argumentTypes);
+    TypeBuilder<(ins "ArrayRef<DITypeAttr>":$types), [{
+      return $_get($_ctxt, /*callingConvention=*/0, types);
     }]>
   ];
   let assemblyFormat = "`<` struct(params) `>`";
+  let genVerifyDecl = 1;
 }
 
 #endif // LLVMIR_ATTRDEFS
diff --git a/mlir/lib/Dialect/LLVMIR/IR/LLVMAttrs.cpp b/mlir/lib/Dialect/LLVMIR/IR/LLVMAttrs.cpp
--- a/mlir/lib/Dialect/LLVMIR/IR/LLVMAttrs.cpp
+++ b/mlir/lib/Dialect/LLVMIR/IR/LLVMAttrs.cpp
@@ -41,11 +41,11 @@
 //===----------------------------------------------------------------------===//
 
 bool DINodeAttr::classof(Attribute attr) {
-  return llvm::isa<DIBasicTypeAttr, DICompileUnitAttr, DICompositeTypeAttr,
-                   DIDerivedTypeAttr, DIFileAttr, DILexicalBlockAttr,
-                   DILexicalBlockFileAttr, DILocalVariableAttr,
-                   DISubprogramAttr, DISubrangeAttr, DISubroutineTypeAttr>(
-      attr);
+  return llvm::isa<DIVoidResultTypeAttr, DIBasicTypeAttr, DICompileUnitAttr,
+                   DICompositeTypeAttr, DIDerivedTypeAttr, DIFileAttr,
+                   DILexicalBlockAttr, DILexicalBlockFileAttr,
+                   DILocalVariableAttr, DISubprogramAttr, DISubrangeAttr,
+                   DISubroutineTypeAttr>(attr);
 }
 
 //===----------------------------------------------------------------------===//
@@ -62,8 +62,8 @@
 //===----------------------------------------------------------------------===//
 
 bool DITypeAttr::classof(Attribute attr) {
-  return llvm::isa<DIBasicTypeAttr, DICompositeTypeAttr, DIDerivedTypeAttr,
-                   DISubroutineTypeAttr>(attr);
+  return llvm::isa<DIVoidResultTypeAttr, DIBasicTypeAttr, DICompositeTypeAttr,
+                   DIDerivedTypeAttr, DISubroutineTypeAttr>(attr);
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp b/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
--- a/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
+++ b/mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
@@ -2803,10 +2803,10 @@
 
   AliasResult getAlias(Attribute attr, raw_ostream &os) const override {
     return TypeSwitch<Attribute, AliasResult>(attr)
-        .Case<DIBasicTypeAttr, DICompileUnitAttr, DICompositeTypeAttr,
-              DIDerivedTypeAttr, DIFileAttr, DILexicalBlockAttr,
-              DILexicalBlockFileAttr, DILocalVariableAttr, DISubprogramAttr,
-              DISubroutineTypeAttr>([&](auto attr) {
+        .Case<DIVoidResultTypeAttr, DIBasicTypeAttr, DICompileUnitAttr,
+              DICompositeTypeAttr, DIDerivedTypeAttr, DIFileAttr,
+              DILexicalBlockAttr, DILexicalBlockFileAttr, DILocalVariableAttr,
+              DISubprogramAttr, DISubroutineTypeAttr>([&](auto attr) {
           os << decltype(attr)::getMnemonic();
           return AliasResult::OverridableAlias;
         })
@@ -3114,6 +3114,23 @@
   return success();
 }
 
+//===----------------------------------------------------------------------===//
+// Verification for DISubroutineTypeAttr.
+//===----------------------------------------------------------------------===//
+
+LogicalResult
+DISubroutineTypeAttr::verify(function_ref<InFlightDiagnostic()> emitError,
+                             unsigned int callingConventions,
+                             ArrayRef<DITypeAttr> types) {
+  for (const auto &it : llvm::enumerate(types)) {
+    if (it.value().isa<DIVoidResultTypeAttr>() && it.index() != 0) {
+      return emitError()
+             << "expected subroutine to have non-void argument types";
+    }
+  }
+  return success();
+}
+
 //===----------------------------------------------------------------------===//
 // Utility functions.
 //===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Target/LLVMIR/DebugImporter.cpp b/mlir/lib/Target/LLVMIR/DebugImporter.cpp
--- a/mlir/lib/Target/LLVMIR/DebugImporter.cpp
+++ b/mlir/lib/Target/LLVMIR/DebugImporter.cpp
@@ -129,15 +129,19 @@
 
 DISubroutineTypeAttr
 DebugImporter::translateImpl(llvm::DISubroutineType *node) {
-  // Separate the result type since it is null for void functions.
-  DITypeAttr resultType = translate(*node->getTypeArray().begin());
-  SmallVector<DITypeAttr> argumentTypes;
-  for (llvm::DIType *type : llvm::drop_begin(node->getTypeArray())) {
-    assert(type && "expected a non-null argument type");
-    argumentTypes.push_back(translate(type));
+  SmallVector<DITypeAttr> types;
+  for (llvm::DIType *type : node->getTypeArray()) {
+    if (!type) {
+      // A nullptr entry at the beginning of the subroutine types list models a
+      // void result type. Translate the nullptr to an explicit
+      // DIVoidResultTypeAttr since the attribute list cannot contain a nullptr
+      // entry.
+      types.push_back(DIVoidResultTypeAttr::get(context));
+      continue;
+    }
+    types.push_back(translate(type));
   }
-  return DISubroutineTypeAttr::get(context, node->getCC(), resultType,
-                                   argumentTypes);
+  return DISubroutineTypeAttr::get(context, node->getCC(), types);
 }
 
 DITypeAttr DebugImporter::translateImpl(llvm::DIType *node) {
diff --git a/mlir/lib/Target/LLVMIR/DebugTranslation.h b/mlir/lib/Target/LLVMIR/DebugTranslation.h
--- a/mlir/lib/Target/LLVMIR/DebugTranslation.h
+++ b/mlir/lib/Target/LLVMIR/DebugTranslation.h
@@ -61,6 +61,7 @@
   llvm::DIFile *translateFile(StringRef fileName);
 
   /// Translate the given attribute to the corresponding llvm debug metadata.
+  llvm::DIType *translateImpl(DIVoidResultTypeAttr attr);
   llvm::DIBasicType *translateImpl(DIBasicTypeAttr attr);
   llvm::DICompileUnit *translateImpl(DICompileUnitAttr attr);
   llvm::DICompositeType *translateImpl(DICompositeTypeAttr attr);
diff --git a/mlir/lib/Target/LLVMIR/DebugTranslation.cpp b/mlir/lib/Target/LLVMIR/DebugTranslation.cpp
--- a/mlir/lib/Target/LLVMIR/DebugTranslation.cpp
+++ b/mlir/lib/Target/LLVMIR/DebugTranslation.cpp
@@ -88,6 +88,14 @@
 // Attributes
 //===----------------------------------------------------------------------===//
 
+llvm::DIType *DebugTranslation::translateImpl(DIVoidResultTypeAttr attr) {
+  // A DIVoidResultTypeAttr at the beginning of the subroutine types list models
+  // a void result type. Translate the explicit DIVoidResultTypeAttr to a
+  // nullptr since LLVM IR metadata does not have an explicit void result type
+  // representation.
+  return nullptr;
+}
+
 llvm::DIBasicType *DebugTranslation::translateImpl(DIBasicTypeAttr attr) {
   return llvm::DIBasicType::get(
       llvmCtx, attr.getTag(), attr.getName(), attr.getSizeInBits(),
@@ -201,8 +209,8 @@
 llvm::DISubroutineType *
 DebugTranslation::translateImpl(DISubroutineTypeAttr attr) {
   // Concatenate the result and argument types into a single array.
-  SmallVector<llvm::Metadata *> types = {translate(attr.getResultType())};
-  for (DITypeAttr type : attr.getArgumentTypes())
+  SmallVector<llvm::Metadata *> types;
+  for (DITypeAttr type : attr.getTypes())
     types.push_back(translate(type));
   return llvm::DISubroutineType::get(
       llvmCtx, llvm::DINode::FlagZero, attr.getCallingConvention(),
@@ -222,10 +230,10 @@
 
   llvm::DINode *node =
       TypeSwitch<DINodeAttr, llvm::DINode *>(attr)
-          .Case<DIBasicTypeAttr, DICompileUnitAttr, DICompositeTypeAttr,
-                DIDerivedTypeAttr, DIFileAttr, DILexicalBlockAttr,
-                DILexicalBlockFileAttr, DILocalVariableAttr, DISubprogramAttr,
-                DISubrangeAttr, DISubroutineTypeAttr>(
+          .Case<DIVoidResultTypeAttr, DIBasicTypeAttr, DICompileUnitAttr,
+                DICompositeTypeAttr, DIDerivedTypeAttr, DIFileAttr,
+                DILexicalBlockAttr, DILexicalBlockFileAttr, DILocalVariableAttr,
+                DISubprogramAttr, DISubrangeAttr, DISubroutineTypeAttr>(
               [&](auto attr) { return translateImpl(attr); });
   attrToNode.insert({attr, node});
   return node;
diff --git a/mlir/test/Dialect/LLVMIR/debuginfo.mlir b/mlir/test/Dialect/LLVMIR/debuginfo.mlir
--- a/mlir/test/Dialect/LLVMIR/debuginfo.mlir
+++ b/mlir/test/Dialect/LLVMIR/debuginfo.mlir
@@ -9,6 +9,9 @@
   isOptimized = true, emissionKind = Full
 >
 
+// CHECK-DAG: #[[VOID:.*]] = #llvm.di_void_result_type
+#void = #llvm.di_void_result_type
+
 // CHECK-DAG: #[[INT0:.*]] = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "int0">
 #int0 = #llvm.di_basic_type<
   // Omit the optional sizeInBits and encoding parameters.
@@ -55,15 +58,21 @@
   elements = #llvm.di_subrange<lowerBound = 0, upperBound = 4, stride = 1>
 >
 
-// CHECK-DAG: #[[SPTYPE0:.*]] = #llvm.di_subroutine_type<callingConvention = DW_CC_normal, argumentTypes = #[[INT0]], #[[PTR0]], #[[PTR1]], #[[COMP0:.*]], #[[COMP1:.*]], #[[COMP2:.*]]>
+// CHECK-DAG: #[[SPTYPE0:.*]] = #llvm.di_subroutine_type<callingConvention = DW_CC_normal, types = #[[VOID]], #[[INT0]], #[[PTR0]], #[[PTR1]], #[[COMP0:.*]], #[[COMP1:.*]], #[[COMP2:.*]]>
 #spType0 = #llvm.di_subroutine_type<
-  callingConvention = DW_CC_normal, argumentTypes = #int0, #ptr0, #ptr1, #comp0, #comp1, #comp2
+  callingConvention = DW_CC_normal, types = #void, #int0, #ptr0, #ptr1, #comp0, #comp1, #comp2
 >
 
-// CHECK-DAG: #[[SPTYPE1:.*]] = #llvm.di_subroutine_type<resultType = #[[INT1]], argumentTypes = #[[INT1]]>
+// CHECK-DAG: #[[SPTYPE1:.*]] = #llvm.di_subroutine_type<types = #[[INT1]], #[[INT1]]>
 #spType1 = #llvm.di_subroutine_type<
   // Omit the optional callingConvention parameter.
-  resultType = #int1, argumentTypes = #int1
+  types = #int1, #int1
+>
+
+// CHECK-DAG: #[[SPTYPE2:.*]] = #llvm.di_subroutine_type<callingConvention = DW_CC_normal>
+#spType2 = #llvm.di_subroutine_type<
+  // Omit the optional types parameter array.
+  callingConvention = DW_CC_normal
 >
 
 // CHECK-DAG: #[[SP0:.*]] = #llvm.di_subprogram<compileUnit = #[[CU]], scope = #[[FILE]], name = "addr", linkageName = "addr", file = #[[FILE]], line = 3, scopeLine = 3, subprogramFlags = "Definition|Optimized", type = #[[SPTYPE0]]>
@@ -79,22 +88,38 @@
   file = #file, subprogramFlags = "Definition", type = #spType1
 >
 
+// CHECK-DAG: #[[SP2:.*]] = #llvm.di_subprogram<compileUnit = #[[CU]], scope = #[[FILE]], name = "value", file = #[[FILE]], subprogramFlags = Definition, type = #[[SPTYPE2]]>
+#sp2 = #llvm.di_subprogram<
+  // Omit the optional linkageName parameter.
+  compileUnit = #cu, scope = #file, name = "value",
+  file = #file, subprogramFlags = "Definition", type = #spType2
+>
+
 // CHECK-DAG: #[[BLOCK0:.*]] = #llvm.di_lexical_block<scope = #[[SP0]], line = 1, column = 2>
 #block0 = #llvm.di_lexical_block<scope = #sp0, line = 1, column = 2>
 
 // CHECK-DAG: #[[BLOCK1:.*]] = #llvm.di_lexical_block<scope = #[[SP1]]>
 #block1 = #llvm.di_lexical_block<scope = #sp1>
 
+// CHECK-DAG: #[[BLOCK2:.*]] = #llvm.di_lexical_block<scope = #[[SP2]]>
+#block2 = #llvm.di_lexical_block<scope = #sp2>
+
 // CHECK-DAG: #[[VAR0:.*]] = #llvm.di_local_variable<scope = #[[BLOCK0]], name = "alloc", file = #[[FILE]], line = 6, arg = 1, alignInBits = 32, type = #[[INT0]]>
 #var0 = #llvm.di_local_variable<
   scope = #block0, name = "alloc", file = #file,
   line = 6, arg = 1, alignInBits = 32, type = #int0
 >
 
-// CHECK-DAG: #[[VAR1:.*]] = #llvm.di_local_variable<scope = #[[BLOCK1]], name = "arg">
+// CHECK-DAG: #[[VAR1:.*]] = #llvm.di_local_variable<scope = #[[BLOCK1]], name = "arg1">
 #var1 = #llvm.di_local_variable<
   // Omit the optional parameters.
-  scope = #block1, name = "arg"
+  scope = #block1, name = "arg1"
+>
+
+// CHECK-DAG: #[[VAR2:.*]] = #llvm.di_local_variable<scope = #[[BLOCK2]], name = "arg2">
+#var2 = #llvm.di_local_variable<
+  // Omit the optional parameters.
+  scope = #block2, name = "arg2"
 >
 
 // CHECK: llvm.func @addr(%[[ARG:.*]]: i64)
@@ -110,9 +135,11 @@
   llvm.return
 }
 
-// CHECK: llvm.func @value(%[[ARG:.*]]: i32)
-llvm.func @value(%arg: i32) -> i32 {
-  // CHECK: llvm.intr.dbg.value #[[VAR1]] = %[[ARG]]
-  llvm.intr.dbg.value #var1 = %arg : i32
-  llvm.return %arg : i32
+// CHECK: llvm.func @value(%[[ARG1:.*]]: i32, %[[ARG2:.*]]: i32)
+llvm.func @value(%arg1: i32, %arg2: i32) {
+  // CHECK: llvm.intr.dbg.value #[[VAR1]] = %[[ARG1]]
+  llvm.intr.dbg.value #var1 = %arg1 : i32
+  // CHECK: llvm.intr.dbg.value #[[VAR2]] = %[[ARG2]]
+  llvm.intr.dbg.value #var2 = %arg2 : i32
+  llvm.return
 }
diff --git a/mlir/test/Dialect/LLVMIR/invalid.mlir b/mlir/test/Dialect/LLVMIR/invalid.mlir
--- a/mlir/test/Dialect/LLVMIR/invalid.mlir
+++ b/mlir/test/Dialect/LLVMIR/invalid.mlir
@@ -1392,3 +1392,9 @@
   // expected-error@+1 {{op failed to verify that it is not extracting scalable from fixed-length vectors.}}
   %0 = llvm.intr.vector.extract %arg0[0] : vector<[8]xf32> from vector<16xf32>
 }
+
+// -----
+
+#void = #llvm.di_void_result_type
+// expected-error@below {{expected subroutine to have non-void argument types}}
+#void_argument_type = #llvm.di_subroutine_type<types = #void, #void>
diff --git a/mlir/test/Target/LLVMIR/Import/debug-info.ll b/mlir/test/Target/LLVMIR/Import/debug-info.ll
--- a/mlir/test/Target/LLVMIR/Import/debug-info.ll
+++ b/mlir/test/Target/LLVMIR/Import/debug-info.ll
@@ -112,9 +112,10 @@
 
 ; // -----
 
-; CHECK: #[[INT1:.+]] = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "int1">
-; CHECK: #[[INT2:.+]] = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "int2", sizeInBits = 32, encoding = DW_ATE_signed>
-; CHECK: #llvm.di_subroutine_type<argumentTypes = #[[INT1]], #[[INT2]]>
+; CHECK-DAG: #[[VOID:.+]] = #llvm.di_void_result_type
+; CHECK-DAG: #[[INT1:.+]] = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "int1">
+; CHECK-DAG: #[[INT2:.+]] = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "int2", sizeInBits = 32, encoding = DW_ATE_signed>
+; CHECK-DAG: #llvm.di_subroutine_type<types = #[[VOID]], #[[INT1]], #[[INT2]]>
 
 define void @basic_type() !dbg !3 {
   ret void
@@ -136,7 +137,7 @@
 ; CHECK: #[[INT:.+]] = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "int">
 ; CHECK: #[[PTR1:.+]] = #llvm.di_derived_type<tag = DW_TAG_pointer_type, baseType = #[[INT]]>
 ; CHECK: #[[PTR2:.+]] = #llvm.di_derived_type<tag = DW_TAG_pointer_type, name = "mypointer", baseType = #[[INT]], sizeInBits = 64, alignInBits = 32, offsetInBits = 4>
-; CHECK: #llvm.di_subroutine_type<argumentTypes = #[[PTR1]], #[[PTR2]]>
+; CHECK: #llvm.di_subroutine_type<types = #[[PTR1]], #[[PTR2]]>
 
 define void @derived_type() !dbg !3 {
   ret void
@@ -149,7 +150,7 @@
 !2 = !DIFile(filename: "debug-info.ll", directory: "/")
 !3 = distinct !DISubprogram(name: "derived_type", scope: !2, file: !2, spFlags: DISPFlagDefinition, unit: !1, type: !4)
 !4 = !DISubroutineType(types: !5)
-!5 = !{null, !7, !8}
+!5 = !{!7, !8}
 !6 = !DIBasicType(name: "int")
 !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6)
 !8 = !DIDerivedType(name: "mypointer", tag: DW_TAG_pointer_type, baseType: !6, size: 64, align: 32, offset: 4)
@@ -162,7 +163,7 @@
 ; CHECK-DAG: #[[COMP2:.+]] = #llvm.di_composite_type<{{.*}}, file = #[[FILE]], scope = #[[FILE]], baseType = #[[INT]]>
 ; CHECK-DAG: #[[COMP3:.+]] = #llvm.di_composite_type<{{.*}}, flags = Vector, elements = #llvm.di_subrange<count = 4 : i64>>
 ; CHECK-DAG: #[[COMP4:.+]] = #llvm.di_composite_type<{{.*}}, flags = Vector, elements = #llvm.di_subrange<lowerBound = 0 : i64, upperBound = 4 : i64, stride = 1 : i64>>
-; CHECK-DAG: #llvm.di_subroutine_type<argumentTypes = #[[COMP1]], #[[COMP2]], #[[COMP3]], #[[COMP4]]>
+; CHECK-DAG: #llvm.di_subroutine_type<types = #[[COMP1]], #[[COMP2]], #[[COMP3]], #[[COMP4]]>
 
 define void @composite_type() !dbg !3 {
   ret void
@@ -175,7 +176,7 @@
 !2 = !DIFile(filename: "debug-info.ll", directory: "/")
 !3 = distinct !DISubprogram(name: "composite_type", scope: !2, file: !2, spFlags: DISPFlagDefinition, unit: !1, type: !4)
 !4 = !DISubroutineType(types: !5)
-!5 = !{null, !7, !8, !9, !10}
+!5 = !{!7, !8, !9, !10}
 !6 = !DIBasicType(name: "int")
 !7 = !DICompositeType(tag: DW_TAG_array_type, name: "array1", line: 10, size: 128, align: 32)
 !8 = !DICompositeType(tag: DW_TAG_array_type, name: "array2", file: !2, scope: !2, baseType: !6)
@@ -188,11 +189,11 @@
 
 ; // -----
 
-; CHECK: #[[INT:.+]] = #llvm.di_basic_type<tag = DW_TAG_base_type, name = "int">
-; CHECK: #[[FILE:.+]] = #llvm.di_file<"debug-info.ll" in "/">
-; CHECK: #[[CU:.+]] = #llvm.di_compile_unit<sourceLanguage = DW_LANG_C, file = #[[FILE]], producer = "", isOptimized = false, emissionKind = None>
-; CHECK: #[[SP_TYPE:.+]] = #llvm.di_subroutine_type<callingConvention = DW_CC_normal, resultType = #[[INT]], argumentTypes = #[[INT]]>
-; CHECK: #[[SP:.+]] = #llvm.di_subprogram<compileUnit = #[[CU]], scope = #[[FILE]], name = "subprogram", linkageName = "subprogram", file = #[[FILE]], line = 42, scopeLine = 42, subprogramFlags = Definition, type = #[[SP_TYPE]]>
+; CHECK-DAG: #[[FILE:.+]] = #llvm.di_file<"debug-info.ll" in "/">
+; CHECK-DAG: #[[CU:.+]] = #llvm.di_compile_unit<sourceLanguage = DW_LANG_C, file = #[[FILE]], producer = "", isOptimized = false, emissionKind = None>
+; Verify an empty subroutine types list is supported.
+; CHECK-DAG: #[[SP_TYPE:.+]] = #llvm.di_subroutine_type<callingConvention = DW_CC_normal>
+; CHECK-DAG: #[[SP:.+]] = #llvm.di_subprogram<compileUnit = #[[CU]], scope = #[[FILE]], name = "subprogram", linkageName = "subprogram", file = #[[FILE]], line = 42, scopeLine = 42, subprogramFlags = Definition, type = #[[SP_TYPE]]>
 
 define void @subprogram() !dbg !3 {
   ret void
@@ -205,7 +206,7 @@
 !2 = !DIFile(filename: "debug-info.ll", directory: "/")
 !3 = distinct !DISubprogram(name: "subprogram", linkageName: "subprogram", scope: !2, file: !2, line: 42, scopeLine: 42, spFlags: DISPFlagDefinition, unit: !1, type: !4)
 !4 = !DISubroutineType(cc: DW_CC_normal, types: !5)
-!5 = !{!6, !6}
+!5 = !{}
 !6 = !DIBasicType(name: "int")
 
 ; // -----
diff --git a/mlir/test/Target/LLVMIR/llvmir-debug.mlir b/mlir/test/Target/LLVMIR/llvmir-debug.mlir
--- a/mlir/test/Target/LLVMIR/llvmir-debug.mlir
+++ b/mlir/test/Target/LLVMIR/llvmir-debug.mlir
@@ -48,24 +48,31 @@
   baseType = #si64, flags = Vector,
   elements = #llvm.di_subrange<lowerBound = 0, upperBound = 4, stride = 1>
 >
-#spType = #llvm.di_subroutine_type<callingConvention = DW_CC_normal, argumentTypes = #si64, #ptr, #named, #composite, #vector>
-#sp = #llvm.di_subprogram<
+#void = #llvm.di_void_result_type
+#spType0 = #llvm.di_subroutine_type<callingConvention = DW_CC_normal, types = #void, #si64, #ptr, #named, #composite, #vector>
+#sp0 = #llvm.di_subprogram<
   compileUnit = #cu, scope = #file, name = "func_with_debug", linkageName = "func_with_debug",
-  file = #file, line = 3, scopeLine = 3, subprogramFlags = "Definition|Optimized", type = #spType
+  file = #file, line = 3, scopeLine = 3, subprogramFlags = "Definition|Optimized", type = #spType0
 >
 #calleeType = #llvm.di_subroutine_type<
-  // Omit the optional callingConvention parameter but specify a result type.
-  resultType = #si64, argumentTypes = #si64>
+  // Omit the optional callingConvention parameter.
+  types = #si64, #si64>
 #callee = #llvm.di_subprogram<
   // Omit the optional linkageName, line, and scopeLine parameters.
   compileUnit = #cu, scope = #file, name = "callee",
   file = #file, subprogramFlags = "Definition", type = #calleeType
 >
-#fileScope = #llvm.di_lexical_block_file<scope = #sp, file = #file, discriminator = 0>
-#blockScope = #llvm.di_lexical_block<scope = #sp>
+#fileScope = #llvm.di_lexical_block_file<scope = #sp0, file = #file, discriminator = 0>
+#blockScope = #llvm.di_lexical_block<scope = #sp0>
 #variable = #llvm.di_local_variable<scope = #fileScope, name = "arg", file = #file, line = 6, arg = 1, alignInBits = 32, type = #si64>
 #variableAddr = #llvm.di_local_variable<scope = #blockScope, name = "alloc">
 
+#spType1 = #llvm.di_subroutine_type<callingConvention = DW_CC_normal>
+#sp1 = #llvm.di_subprogram<
+  compileUnit = #cu, scope = #file, name = "empty_types",
+  file = #file, subprogramFlags = "Definition", type = #spType1
+>
+
 // CHECK-LABEL: define void @func_with_debug(
 // CHECK-SAME: i64 %[[ARG:.*]]) !dbg ![[FUNC_LOC:[0-9]+]]
 llvm.func @func_with_debug(%arg: i64) {
@@ -93,10 +100,15 @@
   llvm.call @func_no_debug() : () -> () loc(fused[callsite("mysource.cc":5:6 at "mysource.cc":1:1), "mysource.cc":1:1])
 
   // CHECK: add i64 %[[ARG]], %[[ARG]], !dbg ![[FUSEDWITH_LOC:[0-9]+]]
-  %sum = llvm.add %arg, %arg : i64 loc(fused<#callee>[callsite("foo.mlir":2:4 at fused<#sp>["foo.mlir":28:5])])
+  %sum = llvm.add %arg, %arg : i64 loc(fused<#callee>[callsite("foo.mlir":2:4 at fused<#sp0>["foo.mlir":28:5])])
 
   llvm.return
-} loc(fused<#sp>["foo.mlir":1:1])
+} loc(fused<#sp0>["foo.mlir":1:1])
+
+// CHECK: define void @empty_types() !dbg ![[EMPTY_TYPES_LOC:[0-9]+]]
+llvm.func @empty_types() {
+  llvm.return
+} loc(fused<#sp1>["foo.mlir":2:1])
 
 // CHECK: ![[CU_LOC:.*]] = distinct !DICompileUnit(language: DW_LANG_C, file: ![[CU_FILE_LOC:.*]], producer: "MLIR", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug)
 // CHECK: ![[CU_FILE_LOC]] = !DIFile(filename: "foo.mlir", directory: "/test/")
@@ -131,3 +143,7 @@
 // CHECK: ![[CALLEE_TYPE]] = !DISubroutineType(types: ![[CALLEE_ARGS:.*]])
 // CHECK: ![[CALLEE_ARGS]] = !{![[ARG_TYPE:.*]], ![[ARG_TYPE:.*]]}
 // CHECK: ![[INLINE_LOC]] = !DILocation(line: 28, column: 5,
+
+// CHECK: ![[EMPTY_TYPES_LOC]] = distinct !DISubprogram(name: "empty_types", scope: ![[CU_FILE_LOC]], file: ![[CU_FILE_LOC]], type: ![[EMPTY_TYPES_TYPE:.*]], spFlags: DISPFlagDefinition
+// CHECK: ![[EMPTY_TYPES_TYPE]] = !DISubroutineType(cc: DW_CC_normal, types: ![[EMPTY_TYPES_ARGS:.*]])
+// CHECK: ![[EMPTY_TYPES_ARGS]] = !{}