[mlir][cuda] Add a test-lower-to-nvvm catchall passpipeline.

This mirrors the test-lower-to-llvm pass pipeline that provides some sanity when running e2e examples.

One peculiarity of the GPU pipeline is that we want to allow 32b indexing in kernels.
This is currently not straightforward as there are dependencies between passes.
This new test pass orders passes in a way that connects end-to-end.

Differential Revision: https://reviews.llvm.org/D155463

mlir/test/Integration/GPU/CUDA/TensorCore/sm80/transform-mma-sync-matmul-f16-f16-accum.mlir

@@ -1,22 +1,7 @@
 // RUN: mlir-opt %s \
 // RUN:  -test-transform-dialect-interpreter \
 // RUN:  -test-transform-dialect-erase-schedule \
-// RUN:  -gpu-kernel-outlining \
-// RUN:  -convert-scf-to-cf \
-// RUN:  -convert-vector-to-llvm \
-// RUN:  -convert-math-to-llvm \
-// RUN:  -expand-strided-metadata \
-// RUN:  -lower-affine \
-// RUN:  -convert-index-to-llvm=index-bitwidth=32 \
-// RUN:  -convert-arith-to-llvm \
-// RUN:  -finalize-memref-to-llvm \
-// RUN:  -convert-func-to-llvm \
-// RUN:  -canonicalize \
-// RUN: | mlir-opt -pass-pipeline='builtin.module(gpu.module(strip-debuginfo,convert-gpu-to-nvvm,convert-nvgpu-to-nvvm{use-opaque-pointers=1},lower-affine,convert-scf-to-cf,convert-vector-to-llvm,convert-math-to-llvm,expand-strided-metadata,lower-affine,convert-index-to-llvm{index-bitwidth=32},convert-arith-to-llvm,reconcile-unrealized-casts,gpu-to-cubin{chip=sm_80 features=+ptx76}))' \
-// RUN: | mlir-opt -convert-index-to-llvm=index-bitwidth=32 \
-// RUN:  -gpu-to-llvm \
-// RUN:  -convert-func-to-llvm \
-// RUN:  -reconcile-unrealized-casts \
+// RUN:  -test-lower-to-nvvm="kernel-index-bitwidth=32 cubin-chip=sm_80 cubin-features=+ptx76" \
 // RUN: | mlir-cpu-runner \
 // RUN:   --shared-libs=%mlir_cuda_runtime \
 // RUN:   --shared-libs=%mlir_runner_utils \

mlir/test/Integration/GPU/CUDA/TensorCore/sm80/transform-mma-sync-matmul-f32.mlir

@@ -11,22 +11,7 @@
 // RUN: mlir-opt %s \
 // RUN:   -test-transform-dialect-interpreter \
 // RUN:   -test-transform-dialect-erase-schedule \
-// RUN:   -gpu-kernel-outlining \
-// RUN:   -convert-scf-to-cf \
-// RUN:   -convert-vector-to-llvm \
-// RUN:   -convert-math-to-llvm \
-// RUN:   -expand-strided-metadata \
-// RUN:   -lower-affine \
-// RUN:   -convert-index-to-llvm=index-bitwidth=32 \
-// RUN:   -convert-arith-to-llvm \
-// RUN:   -finalize-memref-to-llvm \
-// RUN:   -convert-func-to-llvm \
-// RUN:   -canonicalize \
-// RUN: | mlir-opt -pass-pipeline='builtin.module(gpu.module(strip-debuginfo,convert-gpu-to-nvvm,convert-nvgpu-to-nvvm{use-opaque-pointers=1},lower-affine,convert-scf-to-cf,convert-vector-to-llvm,convert-math-to-llvm,expand-strided-metadata,lower-affine,convert-index-to-llvm{index-bitwidth=32},convert-arith-to-llvm,reconcile-unrealized-casts,gpu-to-cubin{chip=sm_80 features=+ptx76}))' \
-// RUN: | mlir-opt -convert-index-to-llvm=index-bitwidth=32 \
-// RUN:   -gpu-to-llvm \
-// RUN:   -convert-func-to-llvm \
-// RUN:   -reconcile-unrealized-casts \
+// RUN:   -test-lower-to-nvvm="kernel-index-bitwidth=32 cubin-chip=sm_80 cubin-features=+ptx76" \
 // RUN: | mlir-cpu-runner \
 // RUN:   --shared-libs=%mlir_cuda_runtime \
 // RUN:   --shared-libs=%mlir_runner_utils \

mlir/test/lib/Dialect/CMakeLists.txt

@@ -10,6 +10,7 @@ add_subdirectory(LLVM)
 add_subdirectory(Math)
 add_subdirectory(MemRef)
 add_subdirectory(NVGPU)
+add_subdirectory(NVVM)
 add_subdirectory(SCF)
 add_subdirectory(Shape)
 add_subdirectory(SPIRV)

mlir/test/lib/Dialect/NVVM/CMakeLists.txt

@@ -0,0 +1,54 @@
+if (MLIR_ENABLE_CUDA_RUNNER)
+  # Configure CUDA support. Using check_language first allows us to give a
+  # custom error message.
+  include(CheckLanguage)
+  check_language(CUDA)
+  if (CMAKE_CUDA_COMPILER)
+    enable_language(CUDA)
+  else()
+    message(SEND_ERROR
+      "Building the mlir cuda runner requires a working CUDA install")
+  endif()
+
+  # We need the libcuda.so library.
+  find_library(CUDA_RUNTIME_LIBRARY cuda HINTS ${CMAKE_CUDA_IMPLICIT_LINK_DIRECTORIES} REQUIRED)
+
+  get_property(conversion_libs GLOBAL PROPERTY MLIR_CONVERSION_LIBS)
+  set(LIBS
+    ${conversion_libs}
+
+    MLIRAnalysis
+    MLIRArithDialect
+    MLIRBuiltinToLLVMIRTranslation
+    MLIRExecutionEngine
+    MLIRFuncDialect
+    MLIRGPUDialect
+    MLIRIR
+    MLIRJitRunner
+    MLIRLLVMDialect
+    MLIRLLVMCommonConversion
+    MLIRLLVMToLLVMIRTranslation
+    MLIRToLLVMIRTranslationRegistration
+    MLIRMemRefDialect
+    MLIRMemRefToLLVM
+    MLIRParser
+    MLIRSPIRVDialect
+    MLIRSPIRVTransforms
+    MLIRSupport
+    MLIRTargetLLVMIRExport
+    MLIRTransforms
+    MLIRTranslateLib
+    MLIRVectorDialect
+    MLIRVectorToLLVM
+  )
+
+  # Exclude tests from libMLIR.so
+  add_mlir_library(MLIRNVVMTestPasses
+    TestLowerToNVVM.cpp
+
+    EXCLUDE_FROM_LIBMLIR
+
+    LINK_LIBS PUBLIC
+    ${LIBS}
+    )
+endif()

mlir/test/lib/Dialect/NVVM/TestLowerToNVVM.cpp

@@ -0,0 +1,330 @@
+//===- TestLowerToNVVM.cpp - Test lowering to NVVM as a sink pass ---------===//
+//
+// 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 implements a pass for testing the lowering to NVVM as a generally
+// usable sink pass.
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Conversion/AffineToStandard/AffineToStandard.h"
+#include "mlir/Conversion/ArithToLLVM/ArithToLLVM.h"
+#include "mlir/Conversion/FuncToLLVM/ConvertFuncToLLVMPass.h"
+#include "mlir/Conversion/GPUCommon/GPUCommonPass.h"
+#include "mlir/Conversion/GPUToNVVM/GPUToNVVMPass.h"
+#include "mlir/Conversion/GPUToSPIRV/GPUToSPIRVPass.h"
+#include "mlir/Conversion/GPUToVulkan/ConvertGPUToVulkanPass.h"
+#include "mlir/Conversion/IndexToLLVM/IndexToLLVM.h"
+#include "mlir/Conversion/LLVMCommon/LoweringOptions.h"
+#include "mlir/Conversion/LinalgToLLVM/LinalgToLLVM.h"
+#include "mlir/Conversion/MathToLLVM/MathToLLVM.h"
+#include "mlir/Conversion/MemRefToLLVM/MemRefToLLVM.h"
+#include "mlir/Conversion/NVGPUToNVVM/NVGPUToNVVM.h"
+#include "mlir/Conversion/ReconcileUnrealizedCasts/ReconcileUnrealizedCasts.h"
+#include "mlir/Conversion/SCFToControlFlow/SCFToControlFlow.h"
+#include "mlir/Conversion/VectorToLLVM/ConvertVectorToLLVM.h"
+#include "mlir/Conversion/VectorToSCF/VectorToSCF.h"
+#include "mlir/Dialect/Arith/IR/Arith.h"
+#include "mlir/Dialect/Func/IR/FuncOps.h"
+#include "mlir/Dialect/GPU/IR/GPUDialect.h"
+#include "mlir/Dialect/GPU/Transforms/Passes.h"
+#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
+#include "mlir/Dialect/LLVMIR/Transforms/RequestCWrappers.h"
+#include "mlir/Dialect/Linalg/Passes.h"
+#include "mlir/Dialect/MemRef/IR/MemRef.h"
+#include "mlir/Dialect/MemRef/Transforms/Passes.h"
+#include "mlir/Dialect/Vector/IR/VectorOps.h"
+#include "mlir/ExecutionEngine/JitRunner.h"
+#include "mlir/Pass/Pass.h"
+#include "mlir/Pass/PassManager.h"
+#include "mlir/Pass/PassOptions.h"
+#include "mlir/Target/LLVMIR/Dialect/Builtin/BuiltinToLLVMIRTranslation.h"
+#include "mlir/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.h"
+#include "mlir/Transforms/Passes.h"
+#include "llvm/Support/InitLLVM.h"
+#include "llvm/Support/TargetSelect.h"
+
+using namespace mlir;
+
+namespace {
+struct TestLowerToNVVMOptions
+    : public PassPipelineOptions<TestLowerToNVVMOptions> {
+  PassOptions::Option<int64_t> hostIndexBitWidth{
+      *this, "host-index-bitwidth",
+      llvm::cl::desc("Bitwidth of the index type for the host (warning this "
+                     "should be 64 until the GPU layering is fixed)"),
+      llvm::cl::init(64)};
+  PassOptions::Option<bool> hostUseBarePtrCallConv{
+      *this, "host-bare-ptr-calling-convention",
+      llvm::cl::desc(
+          "Whether to use the bareptr calling convention on the host (warning "
+          "this should be false until the GPU layering is fixed)"),
+      llvm::cl::init(false)};
+  PassOptions::Option<int64_t> kernelIndexBitWidth{
+      *this, "kernel-index-bitwidth",
+      llvm::cl::desc("Bitwidth of the index type for the GPU kernels"),
+      llvm::cl::init(64)};
+  PassOptions::Option<bool> kernelUseBarePtrCallConv{
+      *this, "kernel-bare-ptr-calling-convention",
+      llvm::cl::desc(
+          "Whether to use the bareptr calling convention on the kernel "
+          "(warning this should be false until the GPU layering is fixed)"),
+      llvm::cl::init(false)};
+  PassOptions::Option<std::string> cubinTriple{
+      *this, "cubin-triple",
+      llvm::cl::desc("Triple to use to serialize to cubin."),
+      llvm::cl::init("nvptx64-nvidia-cuda")};
+  PassOptions::Option<std::string> cubinChip{
+      *this, "cubin-chip", llvm::cl::desc("Chip to use to serialize to cubin."),
+      llvm::cl::init("sm_80")};
+  PassOptions::Option<std::string> cubinFeatures{
+      *this, "cubin-features",
+      llvm::cl::desc("Features to use to serialize to cubin."),
+      llvm::cl::init("+ptx76")};
+};
+
+//===----------------------------------------------------------------------===//
+// GPUModule-specific stuff.
+//===----------------------------------------------------------------------===//
+void buildGpuPassPipeline(OpPassManager &pm,
+                          const TestLowerToNVVMOptions &options) {
+  pm.addNestedPass<gpu::GPUModuleOp>(createStripDebugInfoPass());
+
+  pm.addNestedPass<gpu::GPUModuleOp>(createConvertVectorToSCFPass());
+  // Blanket-convert any remaining linalg ops to loops if any remain.
+  pm.addNestedPass<gpu::GPUModuleOp>(createConvertLinalgToLoopsPass());
+  // Convert SCF to CF (always needed).
+  pm.addNestedPass<gpu::GPUModuleOp>(createConvertSCFToCFPass());
+  // Convert Math to LLVM (always needed).
+  pm.addNestedPass<gpu::GPUModuleOp>(createConvertMathToLLVMPass());
+  // Expand complicated MemRef operations before lowering them.
+  pm.addNestedPass<gpu::GPUModuleOp>(memref::createExpandStridedMetadataPass());
+  // The expansion may create affine expressions. Get rid of them.
+  pm.addNestedPass<gpu::GPUModuleOp>(createLowerAffinePass());
+
+  // Convert MemRef to LLVM (always needed).
+  // TODO: C++20 designated initializers.
+  FinalizeMemRefToLLVMConversionPassOptions
+      finalizeMemRefToLLVMConversionPassOptions;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  finalizeMemRefToLLVMConversionPassOptions.indexBitwidth =
+      options.kernelIndexBitWidth;
+  finalizeMemRefToLLVMConversionPassOptions.useOpaquePointers = true;
+  pm.addNestedPass<gpu::GPUModuleOp>(createFinalizeMemRefToLLVMConversionPass(
+      finalizeMemRefToLLVMConversionPassOptions));
+
+  // Convert Func to LLVM (always needed).
+  // TODO: C++20 designated initializers.
+  ConvertFuncToLLVMPassOptions convertFuncToLLVMPassOptions;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  convertFuncToLLVMPassOptions.indexBitwidth = options.kernelIndexBitWidth;
+  convertFuncToLLVMPassOptions.useBarePtrCallConv =
+      options.kernelUseBarePtrCallConv;
+  convertFuncToLLVMPassOptions.useOpaquePointers = true;
+  pm.addNestedPass<gpu::GPUModuleOp>(
+      createConvertFuncToLLVMPass(convertFuncToLLVMPassOptions));
+
+  // TODO: C++20 designated initializers.
+  ConvertIndexToLLVMPassOptions convertIndexToLLVMPassOpt;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  convertIndexToLLVMPassOpt.indexBitwidth = options.kernelIndexBitWidth;
+  pm.addNestedPass<gpu::GPUModuleOp>(
+      createConvertIndexToLLVMPass(convertIndexToLLVMPassOpt));
+
+  // TODO: C++20 designated initializers.
+  // The following pass is inconsistent.
+  // ConvertGpuOpsToNVVMOpsOptions convertGpuOpsToNVVMOpsOptions;
+  // convertGpuOpsToNVVMOpsOptions.indexBitwidth =
+  //   options.kernelIndexBitWidth;
+  pm.addNestedPass<gpu::GPUModuleOp>(
+      // TODO: fix inconsistence.
+      createLowerGpuOpsToNVVMOpsPass(/*indexBitWidth=*/
+                                     options.kernelIndexBitWidth));
+
+  // TODO: C++20 designated initializers.
+  ConvertNVGPUToNVVMPassOptions convertNVGPUToNVVMPassOptions;
+  convertNVGPUToNVVMPassOptions.useOpaquePointers = true;
+  pm.addNestedPass<gpu::GPUModuleOp>(
+      createConvertNVGPUToNVVMPass(convertNVGPUToNVVMPassOptions));
+  pm.addNestedPass<gpu::GPUModuleOp>(createConvertSCFToCFPass());
+
+  // TODO: C++20 designated initializers.
+  GpuToLLVMConversionPassOptions gpuToLLVMConversionOptions;
+  // Note: hostBarePtrCallConv must be false for now otherwise
+  // gpu::HostRegister is ill-defined: it wants unranked memrefs but can't
+  // lower the to bare ptr.
+  gpuToLLVMConversionOptions.hostBarePtrCallConv =
+      options.hostUseBarePtrCallConv;
+  gpuToLLVMConversionOptions.kernelBarePtrCallConv =
+      options.kernelUseBarePtrCallConv;
+  gpuToLLVMConversionOptions.useOpaquePointers = true;
+
+  // TODO: something useful here.
+  // gpuToLLVMConversionOptions.gpuBinaryAnnotation = "";
+  pm.addNestedPass<gpu::GPUModuleOp>(
+      createGpuToLLVMConversionPass(gpuToLLVMConversionOptions));
+
+  // Convert vector to LLVM (always needed).
+  // TODO: C++20 designated initializers.
+  ConvertVectorToLLVMPassOptions convertVectorToLLVMPassOptions;
+  convertVectorToLLVMPassOptions.reassociateFPReductions = true;
+  pm.addNestedPass<gpu::GPUModuleOp>(
+      createConvertVectorToLLVMPass(convertVectorToLLVMPassOptions));
+
+  // Sprinkle some cleanups.
+  pm.addPass(createCanonicalizerPass());
+  pm.addPass(createCSEPass());
+
+  // Finally we can reconcile unrealized casts.
+  pm.addNestedPass<gpu::GPUModuleOp>(createReconcileUnrealizedCastsPass());
+  pm.addNestedPass<gpu::GPUModuleOp>(createGpuSerializeToCubinPass(
+      options.cubinTriple, options.cubinChip, options.cubinFeatures));
+}
+
+void buildLowerToNVVMPassPipeline(OpPassManager &pm,
+                                  const TestLowerToNVVMOptions &options) {
+  //===----------------------------------------------------------------------===//
+  // Host-specific stuff.
+  //===----------------------------------------------------------------------===//
+  // Important, must be run at the top-level.
+  pm.addPass(createGpuKernelOutliningPass());
+
+  // Important, all host passes must be run at the func level so that host
+  // conversions can remain with 64 bit indices without polluting the GPU
+  // kernel that may have 32 bit indices.
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  pm.addNestedPass<func::FuncOp>(createConvertVectorToSCFPass());
+  // Blanket-convert any remaining linalg ops to loops if any remain.
+  pm.addNestedPass<func::FuncOp>(createConvertLinalgToLoopsPass());
+  // Convert SCF to CF (always needed).
+  pm.addNestedPass<func::FuncOp>(createConvertSCFToCFPass());
+  // Convert Math to LLVM (always needed).
+  pm.addNestedPass<func::FuncOp>(createConvertMathToLLVMPass());
+  // Expand complicated MemRef operations before lowering them.
+  pm.addNestedPass<func::FuncOp>(memref::createExpandStridedMetadataPass());
+  // The expansion may create affine expressions. Get rid of them.
+  pm.addNestedPass<func::FuncOp>(createLowerAffinePass());
+
+  // Convert MemRef to LLVM (always needed).
+  // TODO: C++20 designated initializers.
+  FinalizeMemRefToLLVMConversionPassOptions
+      finalizeMemRefToLLVMConversionPassOptions;
+  finalizeMemRefToLLVMConversionPassOptions.useAlignedAlloc = true;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  finalizeMemRefToLLVMConversionPassOptions.indexBitwidth =
+      options.hostIndexBitWidth;
+  finalizeMemRefToLLVMConversionPassOptions.useOpaquePointers = true;
+  pm.addNestedPass<func::FuncOp>(createFinalizeMemRefToLLVMConversionPass(
+      finalizeMemRefToLLVMConversionPassOptions));
+
+  // Convert Func to LLVM (always needed).
+  // TODO: C++20 designated initializers.
+  ConvertFuncToLLVMPassOptions convertFuncToLLVMPassOptions;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  convertFuncToLLVMPassOptions.indexBitwidth = options.hostIndexBitWidth;
+  convertFuncToLLVMPassOptions.useBarePtrCallConv =
+      options.hostUseBarePtrCallConv;
+  convertFuncToLLVMPassOptions.useOpaquePointers = true;
+  pm.addNestedPass<func::FuncOp>(
+      createConvertFuncToLLVMPass(convertFuncToLLVMPassOptions));
+
+  // TODO: C++20 designated initializers.
+  ConvertIndexToLLVMPassOptions convertIndexToLLVMPassOpt;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  convertIndexToLLVMPassOpt.indexBitwidth = options.hostIndexBitWidth;
+  pm.addNestedPass<func::FuncOp>(
+      createConvertIndexToLLVMPass(convertIndexToLLVMPassOpt));
+
+  pm.addNestedPass<func::FuncOp>(createArithToLLVMConversionPass());
+
+  // Sprinkle some cleanups.
+  pm.addNestedPass<func::FuncOp>(createCanonicalizerPass());
+  pm.addNestedPass<func::FuncOp>(createCSEPass());
+
+  //===----------------------------------------------------------------------===//
+  // GPUModule-specific stuff.
+  //===----------------------------------------------------------------------===//
+  buildGpuPassPipeline(pm, options);
+
+  //===----------------------------------------------------------------------===//
+  // Host post-GPUModule-specific stuff.
+  //===----------------------------------------------------------------------===//
+  // Convert vector to LLVM (always needed).
+  // TODO: C++20 designated initializers.
+  ConvertVectorToLLVMPassOptions convertVectorToLLVMPassOptions;
+  convertVectorToLLVMPassOptions.reassociateFPReductions = true;
+  pm.addNestedPass<func::FuncOp>(
+      createConvertVectorToLLVMPass(convertVectorToLLVMPassOptions));
+
+  ConvertIndexToLLVMPassOptions convertIndexToLLVMPassOpt3;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  // TODO: fix GPU layering.
+  convertIndexToLLVMPassOpt3.indexBitwidth = options.hostIndexBitWidth;
+  pm.addPass(createConvertIndexToLLVMPass(convertIndexToLLVMPassOpt3));
+
+  // This must happen after cubin translation otherwise gpu.launch_func is
+  // illegal if no cubin annotation is present.
+  // TODO: C++20 designated initializers.
+  GpuToLLVMConversionPassOptions gpuToLLVMConversionOptions;
+  // Note: hostBarePtrCallConv must be false for now otherwise
+  // gpu::HostRegister is ill-defined: it wants unranked memrefs but can't
+  // lower the to bare ptr.
+  gpuToLLVMConversionOptions.hostBarePtrCallConv =
+      options.hostUseBarePtrCallConv;
+  gpuToLLVMConversionOptions.kernelBarePtrCallConv =
+      options.kernelUseBarePtrCallConv;
+  gpuToLLVMConversionOptions.useOpaquePointers = true;
+  // TODO: something useful here.
+  // gpuToLLVMConversionOptions.gpuBinaryAnnotation = "";
+  pm.addPass(createGpuToLLVMConversionPass(gpuToLLVMConversionOptions));
+
+  // Convert Func to LLVM (always needed).
+  // TODO: C++20 designated initializers.
+  ConvertFuncToLLVMPassOptions convertFuncToLLVMPassOptions2;
+  // Must be 64b on the host, things don't compose properly around
+  // gpu::LaunchOp and gpu::HostRegisterOp.
+  convertFuncToLLVMPassOptions2.indexBitwidth = options.hostIndexBitWidth;
+  convertFuncToLLVMPassOptions2.useBarePtrCallConv =
+      options.hostUseBarePtrCallConv;
+  convertFuncToLLVMPassOptions2.useOpaquePointers = true;
+  pm.addPass(createConvertFuncToLLVMPass(convertFuncToLLVMPassOptions2));
+
+  // Sprinkle some cleanups.
+  pm.addPass(createCanonicalizerPass());
+  pm.addPass(createCSEPass());
+
+  // Finally we can reconcile unrealized casts.
+  pm.addPass(createReconcileUnrealizedCastsPass());
+}
+} // namespace
+
+namespace mlir {
+namespace test {
+void registerTestLowerToNVVM() {
+  PassPipelineRegistration<TestLowerToNVVMOptions>(
+      "test-lower-to-nvvm",
+      "An example of pipeline to lower the main dialects (arith, linalg, "
+      "memref, scf, vector) down to NVVM.",
+      buildLowerToNVVMPassPipeline);
+}
+} // namespace test
+} // namespace mlir

mlir/tools/mlir-opt/CMakeLists.txt

@@ -12,7 +12,13 @@ set(LLVM_LINK_COMPONENTS
   )
 
 if(MLIR_INCLUDE_TESTS)
+  if(MLIR_ENABLE_CUDA_RUNNER)
+    set(cuda_test_libs
+      MLIRNVVMTestPasses
+      )
+  endif()
   set(test_libs
+    ${cuda_test_libs}
     MLIRTestFuncToLLVM
     MLIRAffineTransformsTestPasses
     MLIRArithTestPasses

mlir/tools/mlir-opt/mlir-opt.cpp

@@ -109,6 +109,7 @@ void registerTestCFGLoopInfoPass();
 void registerTestLoopMappingPass();
 void registerTestLoopUnrollingPass();
 void registerTestLowerToLLVM();
+void registerTestLowerToNVVM();
 void registerTestMakeIsolatedFromAbovePass();
 void registerTestMatchReductionPass();
 void registerTestMathAlgebraicSimplificationPass();
@@ -199,6 +200,7 @@ void registerTestPasses() {
   mlir::test::registerTestDialectConversionPasses();
 #if MLIR_CUDA_CONVERSIONS_ENABLED
   mlir::test::registerTestGpuSerializeToCubinPass();
+  mlir::test::registerTestLowerToNVVM();
 #endif
 #if MLIR_ROCM_CONVERSIONS_ENABLED
   mlir::test::registerTestGpuSerializeToHsacoPass();
@@ -273,6 +275,6 @@ int main(int argc, char **argv) {
   ::test::registerTestTransformDialectExtension(registry);
   ::test::registerTestDynDialect(registry);
 #endif
-  return mlir::asMainReturnCode(
-      mlir::MlirOptMain(argc, argv, "MLIR modular optimizer driver\n", registry));
+  return mlir::asMainReturnCode(mlir::MlirOptMain(
+      argc, argv, "MLIR modular optimizer driver\n", registry));
 }