diff --git a/mlir/include/mlir/Target/LLVMIR/TypeTranslation.h b/mlir/include/mlir/Target/LLVMIR/TypeTranslation.h
new file mode 100644
--- /dev/null
+++ b/mlir/include/mlir/Target/LLVMIR/TypeTranslation.h
@@ -0,0 +1,36 @@
+//===- TypeTranslation.h - Translate types between MLIR & LLVM --*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the type translation function going from MLIR LLVM dialect
+// to LLVM IR and back.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_TARGET_LLVMIR_TYPETRANSLATION_H
+#define MLIR_TARGET_LLVMIR_TYPETRANSLATION_H
+
+namespace llvm {
+class LLVMContext;
+class Type;
+} // namespace llvm
+
+namespace mlir {
+
+class MLIRContext;
+
+namespace LLVM {
+
+class LLVMTypeNew;
+
+llvm::Type *translateTypeToLLVMIR(LLVMTypeNew type, llvm::LLVMContext &context);
+LLVMTypeNew translateTypeFromLLVMIR(llvm::Type *type, MLIRContext &context);
+
+} // namespace LLVM
+} // namespace mlir
+
+#endif // MLIR_TARGET_LLVMIR_TYPETRANSLATION_H
diff --git a/mlir/lib/Target/CMakeLists.txt b/mlir/lib/Target/CMakeLists.txt
--- a/mlir/lib/Target/CMakeLists.txt
+++ b/mlir/lib/Target/CMakeLists.txt
@@ -1,6 +1,7 @@
 add_mlir_translation_library(MLIRTargetLLVMIRModuleTranslation
   LLVMIR/DebugTranslation.cpp
   LLVMIR/ModuleTranslation.cpp
+  LLVMIR/TypeTranslation.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${MLIR_MAIN_INCLUDE_DIR}/mlir/Target/LLVMIR
diff --git a/mlir/lib/Target/LLVMIR/TypeTranslation.cpp b/mlir/lib/Target/LLVMIR/TypeTranslation.cpp
new file mode 100644
--- /dev/null
+++ b/mlir/lib/Target/LLVMIR/TypeTranslation.cpp
@@ -0,0 +1,309 @@
+//===- TypeTranslation.cpp - type translation between MLIR LLVM & LLVM IR -===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Target/LLVMIR/TypeTranslation.h"
+#include "mlir/Dialect/LLVMIR/LLVMTypes.h"
+#include "mlir/IR/MLIRContext.h"
+
+#include "llvm/ADT/TypeSwitch.h"
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/Type.h"
+
+using namespace mlir;
+
+namespace {
+/// Support for translating MLIR LLVM dialect types to LLVM IR.
+class TypeToLLVMIRTranslator {
+public:
+  /// Constructs a class creating types in the given LLVM context.
+  TypeToLLVMIRTranslator(llvm::LLVMContext &context) : context(context) {}
+
+  /// Translates a single type.
+  llvm::Type *translateType(LLVM::LLVMTypeNew type) {
+    // If the conversion is already known, just return it.
+    if (knownTranslations.count(type))
+      return knownTranslations.lookup(type);
+
+    // Dispatch to an appropriate function.
+    llvm::Type *translated =
+        llvm::TypeSwitch<LLVM::LLVMTypeNew, llvm::Type *>(type)
+            .Case([this](LLVM::LLVMVoidType) {
+              return llvm::Type::getVoidTy(context);
+            })
+            .Case([this](LLVM::LLVMHalfType) {
+              return llvm::Type::getHalfTy(context);
+            })
+            .Case([this](LLVM::LLVMBFloatType) {
+              return llvm::Type::getBFloatTy(context);
+            })
+            .Case([this](LLVM::LLVMFloatType) {
+              return llvm::Type::getFloatTy(context);
+            })
+            .Case([this](LLVM::LLVMDoubleType) {
+              return llvm::Type::getDoubleTy(context);
+            })
+            .Case([this](LLVM::LLVMFP128Type) {
+              return llvm::Type::getFP128Ty(context);
+            })
+            .Case([this](LLVM::LLVMX86FP80Type) {
+              return llvm::Type::getX86_FP80Ty(context);
+            })
+            .Case([this](LLVM::LLVMPPCFP128Type) {
+              return llvm::Type::getPPC_FP128Ty(context);
+            })
+            .Case([this](LLVM::LLVMX86MMXType) {
+              return llvm::Type::getX86_MMXTy(context);
+            })
+            .Case([this](LLVM::LLVMTokenType) {
+              return llvm::Type::getTokenTy(context);
+            })
+            .Case([this](LLVM::LLVMLabelType) {
+              return llvm::Type::getLabelTy(context);
+            })
+            .Case([this](LLVM::LLVMMetadataType) {
+              return llvm::Type::getMetadataTy(context);
+            })
+            .Case<LLVM::LLVMArrayType, LLVM::LLVMIntegerType,
+                  LLVM::LLVMFunctionType, LLVM::LLVMPointerType,
+                  LLVM::LLVMStructType, LLVM::LLVMFixedVectorType,
+                  LLVM::LLVMScalableVectorType>(
+                [this](auto array) { return translate(array); })
+            .Default([](LLVM::LLVMTypeNew t) -> llvm::Type * {
+              llvm_unreachable("unknown LLVM dialect type");
+            });
+
+    // Cache the result of the conversion and return.
+    knownTranslations.try_emplace(type, translated);
+    return translated;
+  }
+
+private:
+  /// Translates the given array type.
+  llvm::Type *translate(LLVM::LLVMArrayType type) {
+    return llvm::ArrayType::get(translateType(type.getElementType()),
+                                type.getNumElements());
+  }
+
+  /// Translates the given function type.
+  llvm::Type *translate(LLVM::LLVMFunctionType type) {
+    SmallVector<llvm::Type *, 8> paramTypes;
+    translateTypes(type.getParams(), paramTypes);
+    return llvm::FunctionType::get(translateType(type.getReturnType()),
+                                   paramTypes, type.isVarArg());
+  }
+
+  /// Translates the given integer type.
+  llvm::Type *translate(LLVM::LLVMIntegerType type) {
+    return llvm::IntegerType::get(context, type.getBitWidth());
+  }
+
+  /// Translates the given pointer type.
+  llvm::Type *translate(LLVM::LLVMPointerType type) {
+    return llvm::PointerType::get(translateType(type.getElementType()),
+                                  type.getAddressSpace());
+  }
+
+  /// Translates the given structure type, supports both identified and literal
+  /// structs. This will _create_ a new identified structure every time, use
+  /// `convertType` if a structure with the same name must be looked up instead.
+  llvm::Type *translate(LLVM::LLVMStructType type) {
+    SmallVector<llvm::Type *, 8> subtypes;
+    if (!type.isIdentified()) {
+      translateTypes(type.getBody(), subtypes);
+      return llvm::StructType::get(context, subtypes, type.isPacked());
+    }
+
+    llvm::StructType *structType =
+        llvm::StructType::create(context, type.getName());
+    // Mark the type we just created as known so that recursive calls can pick
+    // it up and use directly.
+    knownTranslations.try_emplace(type, structType);
+    if (type.isOpaque())
+      return structType;
+
+    translateTypes(type.getBody(), subtypes);
+    structType->setBody(subtypes, type.isPacked());
+    return structType;
+  }
+
+  /// Translates the given fixed-vector type.
+  llvm::Type *translate(LLVM::LLVMFixedVectorType type) {
+    return llvm::FixedVectorType::get(translateType(type.getElementType()),
+                                      type.getNumElements());
+  }
+
+  /// Translates the given scalable-vector type.
+  llvm::Type *translate(LLVM::LLVMScalableVectorType type) {
+    return llvm::ScalableVectorType::get(translateType(type.getElementType()),
+                                         type.getMinNumElements());
+  }
+
+  /// Translates a list of types.
+  void translateTypes(ArrayRef<LLVM::LLVMTypeNew> types,
+                      SmallVectorImpl<llvm::Type *> &result) {
+    result.reserve(result.size() + types.size());
+    for (auto type : types)
+      result.push_back(translateType(type));
+  }
+
+  /// Reference to the context in which the LLVM IR types are created.
+  llvm::LLVMContext &context;
+
+  /// Map of known translation. This serves a double purpose: caches translation
+  /// results to avoid repeated recursive calls and makes sure identified
+  /// structs with the same name (that is, equal) are resolved to an existing
+  /// type instead of creating a new type.
+  llvm::DenseMap<LLVM::LLVMTypeNew, llvm::Type *> knownTranslations;
+};
+} // end namespace
+
+/// Translates a type from MLIR LLVM dialect to LLVM IR. This does not maintain
+/// the mapping for identified structs so new structs will be created with
+/// auto-renaming on each call. This is intended exclusively for testing.
+llvm::Type *mlir::LLVM::translateTypeToLLVMIR(LLVM::LLVMTypeNew type,
+                                              llvm::LLVMContext &context) {
+  return TypeToLLVMIRTranslator(context).translateType(type);
+}
+
+namespace {
+/// Support for translating LLVM IR types to MLIR LLVM dialect types.
+class TypeFromLLVMIRTranslator {
+public:
+  /// Constructs a class creating types in the given MLIR context.
+  TypeFromLLVMIRTranslator(MLIRContext &context) : context(context) {}
+
+  /// Translates the given type.
+  LLVM::LLVMTypeNew translateType(llvm::Type *type) {
+    if (knownTranslations.count(type))
+      return knownTranslations.lookup(type);
+
+    LLVM::LLVMTypeNew translated =
+        llvm::TypeSwitch<llvm::Type *, LLVM::LLVMTypeNew>(type)
+            .Case<llvm::ArrayType, llvm::FunctionType, llvm::IntegerType,
+                  llvm::PointerType, llvm::StructType, llvm::FixedVectorType,
+                  llvm::ScalableVectorType>(
+                [this](auto *type) { return translate(type); })
+            .Default([this](llvm::Type *type) {
+              return translatePrimitiveType(type);
+            });
+    knownTranslations.try_emplace(type, translated);
+    return translated;
+  }
+
+private:
+  /// Translates the given primitive, i.e. non-parametric in MLIR nomenclature,
+  /// type.
+  LLVM::LLVMTypeNew translatePrimitiveType(llvm::Type *type) {
+    if (type->isVoidTy())
+      return LLVM::LLVMVoidType::get(&context);
+    if (type->isHalfTy())
+      return LLVM::LLVMHalfType::get(&context);
+    if (type->isBFloatTy())
+      return LLVM::LLVMBFloatType::get(&context);
+    if (type->isFloatTy())
+      return LLVM::LLVMFloatType::get(&context);
+    if (type->isDoubleTy())
+      return LLVM::LLVMDoubleType::get(&context);
+    if (type->isFP128Ty())
+      return LLVM::LLVMFP128Type::get(&context);
+    if (type->isX86_FP80Ty())
+      return LLVM::LLVMX86FP80Type::get(&context);
+    if (type->isPPC_FP128Ty())
+      return LLVM::LLVMPPCFP128Type::get(&context);
+    if (type->isX86_MMXTy())
+      return LLVM::LLVMX86MMXType::get(&context);
+    if (type->isLabelTy())
+      return LLVM::LLVMLabelType::get(&context);
+    if (type->isMetadataTy())
+      return LLVM::LLVMMetadataType::get(&context);
+    llvm_unreachable("not a primitive type");
+  }
+
+  /// Translates the given array type.
+  LLVM::LLVMTypeNew translate(llvm::ArrayType *type) {
+    return LLVM::LLVMArrayType::get(translateType(type->getElementType()),
+                                    type->getNumElements());
+  }
+
+  /// Translates the given function type.
+  LLVM::LLVMTypeNew translate(llvm::FunctionType *type) {
+    SmallVector<LLVM::LLVMTypeNew, 8> paramTypes;
+    translateTypes(type->params(), paramTypes);
+    return LLVM::LLVMFunctionType::get(translateType(type->getReturnType()),
+                                       paramTypes, type->isVarArg());
+  }
+
+  /// Translates the given integer type.
+  LLVM::LLVMTypeNew translate(llvm::IntegerType *type) {
+    return LLVM::LLVMIntegerType::get(&context, type->getBitWidth());
+  }
+
+  /// Translates the given pointer type.
+  LLVM::LLVMTypeNew translate(llvm::PointerType *type) {
+    return LLVM::LLVMPointerType::get(translateType(type->getElementType()),
+                                      type->getAddressSpace());
+  }
+
+  /// Translates the given structure type.
+  LLVM::LLVMTypeNew translate(llvm::StructType *type) {
+    SmallVector<LLVM::LLVMTypeNew, 8> subtypes;
+    if (type->isLiteral()) {
+      translateTypes(type->subtypes(), subtypes);
+      return LLVM::LLVMStructType::getLiteral(&context, subtypes,
+                                              type->isPacked());
+    }
+
+    if (type->isOpaque())
+      return LLVM::LLVMStructType::getOpaque(type->getName(), &context);
+
+    LLVM::LLVMStructType translated =
+        LLVM::LLVMStructType::getIdentified(&context, type->getName());
+    knownTranslations.try_emplace(type, translated);
+    translateTypes(type->subtypes(), subtypes);
+    LogicalResult bodySet = translated.setBody(subtypes, type->isPacked());
+    assert(succeeded(bodySet) &&
+           "could not set the body of an identified struct");
+    (void)bodySet;
+    return translated;
+  }
+
+  /// Translates the given fixed-vector type.
+  LLVM::LLVMTypeNew translate(llvm::FixedVectorType *type) {
+    return LLVM::LLVMFixedVectorType::get(translateType(type->getElementType()),
+                                          type->getNumElements());
+  }
+
+  /// Translates the given scalable-vector type.
+  LLVM::LLVMTypeNew translate(llvm::ScalableVectorType *type) {
+    return LLVM::LLVMScalableVectorType::get(
+        translateType(type->getElementType()), type->getMinNumElements());
+  }
+
+  /// Translates a list of types.
+  void translateTypes(ArrayRef<llvm::Type *> types,
+                      SmallVectorImpl<LLVM::LLVMTypeNew> &result) {
+    result.reserve(result.size() + types.size());
+    for (llvm::Type *type : types)
+      result.push_back(translateType(type));
+  }
+
+  /// Map of known translations. Serves as a cache and as recursion stopper for
+  /// translating recursive structs.
+  llvm::DenseMap<llvm::Type *, LLVM::LLVMTypeNew> knownTranslations;
+
+  /// The context in which MLIR types are created.
+  MLIRContext &context;
+};
+} // end namespace
+
+/// Translates a type from LLVM IR to MLIR LLVM dialect. This is intended
+/// exclusively for testing.
+LLVM::LLVMTypeNew mlir::LLVM::translateTypeFromLLVMIR(llvm::Type *type,
+                                                      MLIRContext &context) {
+  return TypeFromLLVMIRTranslator(context).translateType(type);
+}
diff --git a/mlir/test/Target/llvmir-types.mlir b/mlir/test/Target/llvmir-types.mlir
new file mode 100644
--- /dev/null
+++ b/mlir/test/Target/llvmir-types.mlir
@@ -0,0 +1,228 @@
+// RUN: mlir-translate -test-mlir-to-llvmir -split-input-file %s | FileCheck %s
+
+llvm.func @primitives() {
+  // CHECK: declare void @return_void()
+  // CHECK: declare void @return_void_round()
+  "llvm.test_introduce_func"() { name = "return_void", type = !llvm2.void } : () -> ()
+  // CHECK: declare half @return_half()
+  // CHECK: declare half @return_half_round()
+  "llvm.test_introduce_func"() { name = "return_half", type = !llvm2.half } : () -> ()
+  // CHECK: declare bfloat @return_bfloat()
+  // CHECK: declare bfloat @return_bfloat_round()
+  "llvm.test_introduce_func"() { name = "return_bfloat", type = !llvm2.bfloat } : () -> ()
+  // CHECK: declare float @return_float()
+  // CHECK: declare float @return_float_round()
+  "llvm.test_introduce_func"() { name = "return_float", type = !llvm2.float } : () -> ()
+  // CHECK: declare double @return_double()
+  // CHECK: declare double @return_double_round()
+  "llvm.test_introduce_func"() { name = "return_double", type = !llvm2.double } : () -> ()
+  // CHECK: declare fp128 @return_fp128()
+  // CHECK: declare fp128 @return_fp128_round()
+  "llvm.test_introduce_func"() { name = "return_fp128", type = !llvm2.fp128 } : () -> ()
+  // CHECK: declare x86_fp80 @return_x86_fp80()
+  // CHECK: declare x86_fp80 @return_x86_fp80_round()
+  "llvm.test_introduce_func"() { name = "return_x86_fp80", type = !llvm2.x86_fp80 } : () -> ()
+  // CHECK: declare ppc_fp128 @return_ppc_fp128()
+  // CHECK: declare ppc_fp128 @return_ppc_fp128_round()
+  "llvm.test_introduce_func"() { name = "return_ppc_fp128", type = !llvm2.ppc_fp128 } : () -> ()
+  // CHECK: declare x86_mmx @return_x86_mmx()
+  // CHECK: declare x86_mmx @return_x86_mmx_round()
+  "llvm.test_introduce_func"() { name = "return_x86_mmx", type = !llvm2.x86_mmx } : () -> ()
+  llvm.return
+}
+
+llvm.func @funcs() {
+  // CHECK: declare void @f_void_i32(i32)
+  // CHECK: declare void @f_void_i32_round(i32)
+  "llvm.test_introduce_func"() { name ="f_void_i32", type = !llvm2.func<void (i32)> } : () -> ()
+  // CHECK: declare i32 @f_i32_empty()
+  // CHECK: declare i32 @f_i32_empty_round()
+  "llvm.test_introduce_func"() { name ="f_i32_empty", type = !llvm2.func<i32 ()> } : () -> ()
+  // CHECK: declare i32 @f_i32_half_bfloat_float_double(half, bfloat, float, double)
+  // CHECK: declare i32 @f_i32_half_bfloat_float_double_round(half, bfloat, float, double)
+  "llvm.test_introduce_func"() { name ="f_i32_half_bfloat_float_double", type = !llvm2.func<i32 (half, bfloat, float, double)> } : () -> ()
+  // CHECK: declare i32 @f_i32_i32_i32(i32, i32)
+  // CHECK: declare i32 @f_i32_i32_i32_round(i32, i32)
+  "llvm.test_introduce_func"() { name ="f_i32_i32_i32", type = !llvm2.func<i32 (i32, i32)> } : () -> ()
+  // CHECK: declare void @f_void_variadic(...)
+  // CHECK: declare void @f_void_variadic_round(...)
+  "llvm.test_introduce_func"() { name ="f_void_variadic", type = !llvm2.func<void (...)> } : () -> ()
+  // CHECK: declare void @f_void_i32_i32_variadic(i32, i32, ...)
+  // CHECK: declare void @f_void_i32_i32_variadic_round(i32, i32, ...)
+  "llvm.test_introduce_func"() { name ="f_void_i32_i32_variadic", type = !llvm2.func<void (i32, i32, ...)> } : () -> ()
+  llvm.return
+}
+
+llvm.func @ints() {
+  // CHECK: declare i1 @return_i1()
+  // CHECK: declare i1 @return_i1_round()
+  "llvm.test_introduce_func"() { name = "return_i1", type = !llvm2.i1 } : () -> ()
+  // CHECK: declare i8 @return_i8()
+  // CHECK: declare i8 @return_i8_round()
+  "llvm.test_introduce_func"() { name = "return_i8", type = !llvm2.i8 } : () -> ()
+  // CHECK: declare i16 @return_i16()
+  // CHECK: declare i16 @return_i16_round()
+  "llvm.test_introduce_func"() { name = "return_i16", type = !llvm2.i16 } : () -> ()
+  // CHECK: declare i32 @return_i32()
+  // CHECK: declare i32 @return_i32_round()
+  "llvm.test_introduce_func"() { name = "return_i32", type = !llvm2.i32 } : () -> ()
+  // CHECK: declare i64 @return_i64()
+  // CHECK: declare i64 @return_i64_round()
+  "llvm.test_introduce_func"() { name = "return_i64", type = !llvm2.i64 } : () -> ()
+  // CHECK: declare i57 @return_i57()
+  // CHECK: declare i57 @return_i57_round()
+  "llvm.test_introduce_func"() { name = "return_i57", type = !llvm2.i57 } : () -> ()
+  // CHECK: declare i129 @return_i129()
+  // CHECK: declare i129 @return_i129_round()
+  "llvm.test_introduce_func"() { name = "return_i129", type = !llvm2.i129 } : () -> ()
+  llvm.return
+}
+
+llvm.func @pointers() {
+  // CHECK: declare i8* @return_pi8()
+  // CHECK: declare i8* @return_pi8_round()
+  "llvm.test_introduce_func"() { name = "return_pi8", type = !llvm2.ptr<i8> } : () -> ()
+  // CHECK: declare float* @return_pfloat()
+  // CHECK: declare float* @return_pfloat_round()
+  "llvm.test_introduce_func"() { name = "return_pfloat", type = !llvm2.ptr<float> } : () -> ()
+  // CHECK: declare i8** @return_ppi8()
+  // CHECK: declare i8** @return_ppi8_round()
+  "llvm.test_introduce_func"() { name = "return_ppi8", type = !llvm2.ptr<ptr<i8>> } : () -> ()
+  // CHECK: declare i8***** @return_pppppi8()
+  // CHECK: declare i8***** @return_pppppi8_round()
+  "llvm.test_introduce_func"() { name = "return_pppppi8", type = !llvm2.ptr<ptr<ptr<ptr<ptr<i8>>>>> } : () -> ()
+  // CHECK: declare i8* @return_pi8_0()
+  // CHECK: declare i8* @return_pi8_0_round()
+  "llvm.test_introduce_func"() { name = "return_pi8_0", type = !llvm2.ptr<i8, 0> } : () -> ()
+  // CHECK: declare i8 addrspace(1)* @return_pi8_1()
+  // CHECK: declare i8 addrspace(1)* @return_pi8_1_round()
+  "llvm.test_introduce_func"() { name = "return_pi8_1", type = !llvm2.ptr<i8, 1> } : () -> ()
+  // CHECK: declare i8 addrspace(42)* @return_pi8_42()
+  // CHECK: declare i8 addrspace(42)* @return_pi8_42_round()
+  "llvm.test_introduce_func"() { name = "return_pi8_42", type = !llvm2.ptr<i8, 42> } : () -> ()
+  // CHECK: declare i8 addrspace(42)* addrspace(9)* @return_ppi8_42_9()
+  // CHECK: declare i8 addrspace(42)* addrspace(9)* @return_ppi8_42_9_round()
+  "llvm.test_introduce_func"() { name = "return_ppi8_42_9", type = !llvm2.ptr<ptr<i8, 42>, 9> } : () -> ()
+  llvm.return
+}
+
+llvm.func @vectors() {
+  // CHECK: declare <4 x i32> @return_v4_i32()
+  // CHECK: declare <4 x i32> @return_v4_i32_round()
+  "llvm.test_introduce_func"() { name = "return_v4_i32", type = !llvm2.vec<4 x i32> } : () -> ()
+  // CHECK: declare <4 x float> @return_v4_float()
+  // CHECK: declare <4 x float> @return_v4_float_round()
+  "llvm.test_introduce_func"() { name = "return_v4_float", type = !llvm2.vec<4 x float> } : () -> ()
+  // CHECK: declare <vscale x 4 x i32> @return_vs_4_i32()
+  // CHECK: declare <vscale x 4 x i32> @return_vs_4_i32_round()
+  "llvm.test_introduce_func"() { name = "return_vs_4_i32", type = !llvm2.vec<? x 4 x i32> } : () -> ()
+  // CHECK: declare <vscale x 8 x half> @return_vs_8_half()
+  // CHECK: declare <vscale x 8 x half> @return_vs_8_half_round()
+  "llvm.test_introduce_func"() { name = "return_vs_8_half", type = !llvm2.vec<? x 8 x half> } : () -> ()
+  // CHECK: declare <4 x i8*> @return_v_4_pi8()
+  // CHECK: declare <4 x i8*> @return_v_4_pi8_round()
+  "llvm.test_introduce_func"() { name = "return_v_4_pi8", type = !llvm2.vec<4 x ptr<i8>> } : () -> ()
+  llvm.return
+}
+
+llvm.func @arrays() {
+  // CHECK: declare [10 x i32] @return_a10_i32()
+  // CHECK: declare [10 x i32] @return_a10_i32_round()
+  "llvm.test_introduce_func"() { name = "return_a10_i32", type = !llvm2.array<10 x i32> } : () -> ()
+  // CHECK: declare [8 x float] @return_a8_float()
+  // CHECK: declare [8 x float] @return_a8_float_round()
+  "llvm.test_introduce_func"() { name = "return_a8_float", type = !llvm2.array<8 x float> } : () -> ()
+  // CHECK: declare [10 x i32 addrspace(4)*] @return_a10_pi32_4()
+  // CHECK: declare [10 x i32 addrspace(4)*] @return_a10_pi32_4_round()
+  "llvm.test_introduce_func"() { name = "return_a10_pi32_4", type = !llvm2.array<10 x ptr<i32, 4>> } : () -> ()
+  // CHECK: declare [10 x [4 x float]] @return_a10_a4_float()
+  // CHECK: declare [10 x [4 x float]] @return_a10_a4_float_round()
+  "llvm.test_introduce_func"() { name = "return_a10_a4_float", type = !llvm2.array<10 x array<4 x float>> } : () -> ()
+  llvm.return
+}
+
+llvm.func @literal_structs() {
+  // CHECK: declare {} @return_struct_empty()
+  // CHECK: declare {} @return_struct_empty_round()
+  "llvm.test_introduce_func"() { name = "return_struct_empty", type = !llvm2.struct<()> } : () -> ()
+  // CHECK: declare { i32 } @return_s_i32()
+  // CHECK: declare { i32 } @return_s_i32_round()
+  "llvm.test_introduce_func"() { name = "return_s_i32", type = !llvm2.struct<(i32)> } : () -> ()
+  // CHECK: declare { float, i32 } @return_s_float_i32()
+  // CHECK: declare { float, i32 } @return_s_float_i32_round()
+  "llvm.test_introduce_func"() { name = "return_s_float_i32", type = !llvm2.struct<(float, i32)> } : () -> ()
+  // CHECK: declare { { i32 } } @return_s_s_i32()
+  // CHECK: declare { { i32 } } @return_s_s_i32_round()
+  "llvm.test_introduce_func"() { name = "return_s_s_i32", type = !llvm2.struct<(struct<(i32)>)> } : () -> ()
+  // CHECK: declare { i32, { i32 }, float } @return_s_i32_s_i32_float()
+  // CHECK: declare { i32, { i32 }, float } @return_s_i32_s_i32_float_round()
+  "llvm.test_introduce_func"() { name = "return_s_i32_s_i32_float", type = !llvm2.struct<(i32, struct<(i32)>, float)> } : () -> ()
+
+  // CHECK: declare <{}> @return_sp_empty()
+  // CHECK: declare <{}> @return_sp_empty_round()
+  "llvm.test_introduce_func"() { name = "return_sp_empty", type = !llvm2.struct<packed ()> } : () -> ()
+  // CHECK: declare <{ i32 }> @return_sp_i32()
+  // CHECK: declare <{ i32 }> @return_sp_i32_round()
+  "llvm.test_introduce_func"() { name = "return_sp_i32", type = !llvm2.struct<packed (i32)> } : () -> ()
+  // CHECK: declare <{ float, i32 }> @return_sp_float_i32()
+  // CHECK: declare <{ float, i32 }> @return_sp_float_i32_round()
+  "llvm.test_introduce_func"() { name = "return_sp_float_i32", type = !llvm2.struct<packed (float, i32)> } : () -> ()
+  // CHECK: declare <{ i32, { i32, i1 }, float }> @return_sp_i32_s_i31_1_float()
+  // CHECK: declare <{ i32, { i32, i1 }, float }> @return_sp_i32_s_i31_1_float_round()
+  "llvm.test_introduce_func"() { name = "return_sp_i32_s_i31_1_float", type = !llvm2.struct<packed (i32, struct<(i32, i1)>, float)> } : () -> ()
+
+  // CHECK: declare { <{ i32 }> } @return_s_sp_i32()
+  // CHECK: declare { <{ i32 }> } @return_s_sp_i32_round()
+  "llvm.test_introduce_func"() { name = "return_s_sp_i32", type = !llvm2.struct<(struct<packed (i32)>)> } : () -> ()
+  // CHECK: declare <{ { i32 } }> @return_sp_s_i32()
+  // CHECK: declare <{ { i32 } }> @return_sp_s_i32_round()
+  "llvm.test_introduce_func"() { name = "return_sp_s_i32", type = !llvm2.struct<packed (struct<(i32)>)> } : () -> ()
+  llvm.return
+}
+
+// -----
+// Put structs into a separate split so that we can match their declarations
+// locally.
+
+// CHECK: %empty = type {}
+// CHECK: %opaque = type opaque
+// CHECK: %long = type { i32, { i32, i1 }, float, void ()* }
+// CHECK: %self-recursive = type { %self-recursive* }
+// CHECK: %unpacked = type { i32 }
+// CHECK: %packed = type <{ i32 }>
+// CHECK: %"name with spaces and !^$@$#" = type <{ i32 }>
+// CHECK: %mutually-a = type { %mutually-b* }
+// CHECK: %mutually-b = type { %mutually-a addrspace(3)* }
+// CHECK: %struct-of-arrays = type { [10 x i32] }
+// CHECK: %array-of-structs = type { i32 }
+// CHECK: %ptr-to-struct = type { i8 }
+
+llvm.func @identified_structs() {
+  // CHECK: declare %empty
+  "llvm.test_introduce_func"() { name = "return_s_empty", type = !llvm2.struct<"empty", ()> } : () -> ()
+  // CHECK: declare %opaque
+  "llvm.test_introduce_func"() { name = "return_s_opaque", type = !llvm2.struct<"opaque", opaque> } : () -> ()
+  // CHECK: declare %long
+  "llvm.test_introduce_func"() { name = "return_s_long", type = !llvm2.struct<"long", (i32, struct<(i32, i1)>, float, ptr<func<void ()>>)> } : () -> ()
+  // CHECK: declare %self-recursive
+  "llvm.test_introduce_func"() { name = "return_s_self_recurisve", type = !llvm2.struct<"self-recursive", (ptr<struct<"self-recursive">>)> } : () -> ()
+  // CHECK: declare %unpacked
+  "llvm.test_introduce_func"() { name = "return_s_unpacked", type = !llvm2.struct<"unpacked", (i32)> } : () -> ()
+  // CHECK: declare %packed
+  "llvm.test_introduce_func"() { name = "return_s_packed", type = !llvm2.struct<"packed", packed (i32)> } : () -> ()
+  // CHECK: declare %"name with spaces and !^$@$#"
+  "llvm.test_introduce_func"() { name = "return_s_symbols", type = !llvm2.struct<"name with spaces and !^$@$#", packed (i32)> } : () -> ()
+
+  // CHECK: declare %mutually-a
+  "llvm.test_introduce_func"() { name = "return_s_mutually_a", type = !llvm2.struct<"mutually-a", (ptr<struct<"mutually-b", (ptr<struct<"mutually-a">, 3>)>>)> } : () -> ()
+  // CHECK: declare %mutually-b
+  "llvm.test_introduce_func"() { name = "return_s_mutually_b", type = !llvm2.struct<"mutually-b", (ptr<struct<"mutually-a", (ptr<struct<"mutually-b">>)>, 3>)> } : () -> ()
+
+  // CHECK: declare %struct-of-arrays
+  "llvm.test_introduce_func"() { name = "return_s_struct_of_arrays", type = !llvm2.struct<"struct-of-arrays", (array<10 x i32>)> } : () -> ()
+  // CHECK: declare [10 x %array-of-structs]
+  "llvm.test_introduce_func"() { name = "return_s_array_of_structs", type = !llvm2.array<10 x struct<"array-of-structs", (i32)>> } : () -> ()
+  // CHECK: declare %ptr-to-struct*
+  "llvm.test_introduce_func"() { name = "return_s_ptr_to_struct", type = !llvm2.ptr<struct<"ptr-to-struct", (i8)>> } : () -> ()
+  llvm.return
+}
diff --git a/mlir/test/lib/CMakeLists.txt b/mlir/test/lib/CMakeLists.txt
--- a/mlir/test/lib/CMakeLists.txt
+++ b/mlir/test/lib/CMakeLists.txt
@@ -2,4 +2,5 @@
 add_subdirectory(IR)
 add_subdirectory(Pass)
 add_subdirectory(Reducer)
+add_subdirectory(Target)
 add_subdirectory(Transforms)
diff --git a/mlir/test/lib/Target/CMakeLists.txt b/mlir/test/lib/Target/CMakeLists.txt
new file mode 100644
--- /dev/null
+++ b/mlir/test/lib/Target/CMakeLists.txt
@@ -0,0 +1,13 @@
+add_mlir_translation_library(MLIRTestLLVMTypeTranslation
+  TestLLVMTypeTranslation.cpp
+
+  LINK_COMPONENTS
+  Core
+  TransformUtils
+
+  LINK_LIBS PUBLIC
+  MLIRLLVMIR
+  MLIRTargetLLVMIRModuleTranslation
+  MLIRTestIR
+  MLIRTranslation
+  )
diff --git a/mlir/test/lib/Target/TestLLVMTypeTranslation.cpp b/mlir/test/lib/Target/TestLLVMTypeTranslation.cpp
new file mode 100644
--- /dev/null
+++ b/mlir/test/lib/Target/TestLLVMTypeTranslation.cpp
@@ -0,0 +1,79 @@
+//===- TestLLVMTypeTranslation.cpp - Test MLIR/LLVM IR type translation ---===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Dialect/LLVMIR/LLVMTypes.h"
+#include "mlir/Target/LLVMIR/ModuleTranslation.h"
+#include "mlir/Target/LLVMIR/TypeTranslation.h"
+#include "mlir/Translation.h"
+
+using namespace mlir;
+
+namespace {
+class TestLLVMTypeTranslation : public LLVM::ModuleTranslation {
+  // Allow access to the constructors under MSVC.
+  friend LLVM::ModuleTranslation;
+
+public:
+  using LLVM::ModuleTranslation::ModuleTranslation;
+
+protected:
+  /// Simple test facility for translating types from MLIR LLVM dialect to LLVM
+  /// IR. This converts the "llvm.test_introduce_func" operation into an LLVM IR
+  /// function with the name extracted from the `name` attribute that returns
+  /// the type contained in the `type` attribute if it is a non-function type or
+  /// that has the signature obtained by converting `type` if it is a function
+  /// type. This is a temporary check before type translation is substituted
+  /// into the main translation flow and exercised here.
+  LogicalResult convertOperation(Operation &op,
+                                 llvm::IRBuilder<> &builder) override {
+    if (op.getName().getStringRef() == "llvm.test_introduce_func") {
+      auto attr = op.getAttrOfType<TypeAttr>("type");
+      assert(attr && "expected 'type' attribute");
+      auto type = attr.getValue().cast<LLVM::LLVMTypeNew>();
+
+      auto nameAttr = op.getAttrOfType<StringAttr>("name");
+      assert(nameAttr && "expected 'name' attributes");
+
+      llvm::Type *translated =
+          LLVM::translateTypeToLLVMIR(type, builder.getContext());
+
+      llvm::Module *module = builder.GetInsertBlock()->getModule();
+      if (auto *funcType = dyn_cast<llvm::FunctionType>(translated))
+        module->getOrInsertFunction(nameAttr.getValue(), funcType);
+      else
+        module->getOrInsertFunction(nameAttr.getValue(), translated);
+
+      std::string roundtripName = (Twine(nameAttr.getValue()) + "_round").str();
+      LLVM::LLVMTypeNew translatedBack =
+          LLVM::translateTypeFromLLVMIR(translated, *op.getContext());
+      llvm::Type *translatedBackAndForth =
+          LLVM::translateTypeToLLVMIR(translatedBack, builder.getContext());
+      if (auto *funcType = dyn_cast<llvm::FunctionType>(translatedBackAndForth))
+        module->getOrInsertFunction(roundtripName, funcType);
+      else
+        module->getOrInsertFunction(roundtripName, translatedBackAndForth);
+      return success();
+    }
+
+    return LLVM::ModuleTranslation::convertOperation(op, builder);
+  }
+};
+} // namespace
+
+namespace mlir {
+void registerTestLLVMTypeTranslation() {
+  TranslateFromMLIRRegistration reg(
+      "test-mlir-to-llvmir", [](ModuleOp module, raw_ostream &output) {
+        std::unique_ptr<llvm::Module> llvmModule =
+            LLVM::ModuleTranslation::translateModule<TestLLVMTypeTranslation>(
+                module.getOperation());
+        llvmModule->print(output, nullptr);
+        return success();
+      });
+}
+} // namespace mlir
diff --git a/mlir/tools/mlir-translate/CMakeLists.txt b/mlir/tools/mlir-translate/CMakeLists.txt
--- a/mlir/tools/mlir-translate/CMakeLists.txt
+++ b/mlir/tools/mlir-translate/CMakeLists.txt
@@ -13,7 +13,11 @@
   PRIVATE
   ${dialect_libs}
   ${translation_libs}
+  ${test_libs}
   MLIRIR
+  # TODO: remove after LLVM dialect transition is complete; translation uses a
+  # registration function defined in this library unconditionally.
+  MLIRLLVMTypeTestDialect
   MLIRParser
   MLIRPass
   MLIRSPIRV
diff --git a/mlir/tools/mlir-translate/mlir-translate.cpp b/mlir/tools/mlir-translate/mlir-translate.cpp
--- a/mlir/tools/mlir-translate/mlir-translate.cpp
+++ b/mlir/tools/mlir-translate/mlir-translate.cpp
@@ -49,17 +49,21 @@
 
 namespace mlir {
 // Defined in the test directory, no public header.
+void registerLLVMTypeTestDialect();
+void registerTestLLVMTypeTranslation();
 void registerTestRoundtripSPIRV();
 void registerTestRoundtripDebugSPIRV();
 } // namespace mlir
 
 static void registerTestTranslations() {
+  registerTestLLVMTypeTranslation();
   registerTestRoundtripSPIRV();
   registerTestRoundtripDebugSPIRV();
 }
 
 int main(int argc, char **argv) {
   registerAllDialects();
+  registerLLVMTypeTestDialect();
   registerAllTranslations();
   registerTestTranslations();
   llvm::InitLLVM y(argc, argv);