Support for CUTLASS Library generation / Ops / Xe Arch (#578)

## Intel Xe Architecture Support for CUTLASS Library generation

**Feature:** Add Intel Xe12/Xe20 architecture support with operation
generation and Python bindings.

**Use Case:** Enable kernel generation for PyTorch inductor path and ML
frameworks on Intel Arc/PVC GPUs.

**Key Changes:**
- **Architecture Support:** Added Xe12 (PVC) and Xe20 (BMG) with compute
capability 12-50
- **Operations:** FP16, BF16, FP8 (E4M3/E5M2), INT8 GEMM kernels with
multiple tile sizes (256×256, 128×256, etc.)
- **Build Flags:** New CMake options
`-DCUTLASS_LIBRARY_GENERATOR_ARCHS="20"` for Intel GPU targets
- **Python Integration:** CMake-based shared library
(`examples/11_xe20_cutlass_library/`) + ctypes bindings
- **Generator:** Extended `python/cutlass_library/generator.py` with
`GenerateIntelXe()` functions
- **Examples:** Python test scripts with performance benchmarking

**Testing:** ✅ Tested BF16 generated kernels, Examples, Documentation

**Note** These changes do not make use of new APIs (or modified
collectives). That must be different feature / refactoring effort.

**ToDo:**
- [x] Build Failures
- [ ] Benchmark tests for comprehensive performance analysis
- [ ] Testing kernels beyond BF16 (FP16, FP8, INT8)  
- [ ] Optimizing generated kernels with tile sizes
- [ ] Modify CMake to avoid explicitly linking with libsycl.so

**Type:** Feature | **Tested On:** Xe20 ✅

Author: Antonyvance

cmake/FindDPCPP.cmake

@@ -41,7 +41,7 @@ add_library(DPCPP::DPCPP INTERFACE IMPORTED)
 set(DPCPP_FLAGS "-fsycl;")
 if(DPCPP_HOST_COMPILER)
   list(APPEND DPCPP_FLAGS "-fsycl-host-compiler=${DPCPP_HOST_COMPILER}")
-  list(APPEND DPCPP_FLAGS "-fsycl-host-compiler-options=-Wno-changes-meaning -D$<JOIN:$<TARGET_PROPERTY:COMPILE_DEFINITIONS>, -D> -I$<JOIN:$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>, -I>")
+  list(APPEND DPCPP_FLAGS "-fsycl-host-compiler-options=-Wno-changes-meaning $<$<BOOL:$<TARGET_PROPERTY:POSITION_INDEPENDENT_CODE>>:-fPIC> -D$<JOIN:$<TARGET_PROPERTY:COMPILE_DEFINITIONS>, -D> -I$<JOIN:$<TARGET_PROPERTY:INCLUDE_DIRECTORIES>, -I>")
 endif()
 set(DPCPP_COMPILE_ONLY_FLAGS "")
 set(DPCPP_LINK_ONLY_FLAGS "")

examples/11_xe20_cutlass_library/CMakeLists.txt

@@ -0,0 +1,99 @@
+# Copyright (C) 2025 Intel Corporation, All rights reserved.
+# SPDX-License-Identifier: BSD-3-Clause
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are met:
+#
+# 1. Redistributions of source code must retain the above copyright notice, this
+# list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright notice,
+# this list of conditions and the following disclaimer in the documentation
+# and/or other materials provided with the distribution.
+#
+# 3. Neither the name of the copyright holder nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+# Example 11: XE20 CUTLASS Library BF16 GEMM
+# This example creates a shared library (.so) that exports CUTLASS BF16 GEMM
+# functionality for use with Python via ctypes.
+
+# Create shared library for Python integration
+add_library(xe20_cutlass_library_bf16 SHARED
+  xe_20_cutlass_library_b16.cpp
+)
+
+# Set library properties (this creates shared library for python example to link)
+set_target_properties(xe20_cutlass_library_bf16 PROPERTIES
+  CXX_STANDARD 17
+  CXX_STANDARD_REQUIRED ON
+  VERSION 1.0
+  SOVERSION 1
+  OUTPUT_NAME "xe20_cutlass_library_bf16"
+  POSITION_INDEPENDENT_CODE ON
+)
+
+# Include directories
+target_include_directories(xe20_cutlass_library_bf16 PRIVATE
+  ${CUTLASS_EXAMPLES_COMMON_SOURCE_DIR}
+  ${CUTLASS_EXAMPLES_UTILS_DIR}
+  ${CUTLASS_APPLICATIONS_DIR}
+)
+
+# Link libraries
+target_link_libraries(xe20_cutlass_library_bf16 PRIVATE
+  CUTLASS
+  cutlass_tools_util_includes
+)
+
+# Add compile definitions
+target_compile_definitions(xe20_cutlass_library_bf16 PRIVATE
+  CUTLASS_ENABLE_SYCL=1
+  SYCL_INTEL_TARGET=1
+  DPCPP_SYCL_TARGET=intel_gpu_bmg_g21
+)
+
+# Add Intel-specific SYCL link flags for XE20 optimization
+if(CUTLASS_ENABLE_SYCL AND SYCL_INTEL_TARGET)
+  target_link_options(xe20_cutlass_library_bf16 PRIVATE
+    -Xspirv-translator
+    -spirv-ext=+SPV_INTEL_split_barrier,+SPV_INTEL_2d_block_io,+SPV_INTEL_subgroup_matrix_multiply_accumulate
+  )
+  
+  add_sycl_to_target(TARGET xe20_cutlass_library_bf16)
+  add_onemkl_to_target(TARGET xe20_cutlass_library_bf16)
+endif()
+
+# Link against CUTLASS XE20 GEMM library if available
+if(TARGET cutlass_gemm_xe20_gemm)
+  target_link_libraries(xe20_cutlass_library_bf16 PRIVATE cutlass_gemm_xe20_gemm)
+endif()
+
+# Install the shared library
+install(TARGETS xe20_cutlass_library_bf16
+  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+)
+
+# Add to examples target
+add_dependencies(cutlass_examples xe20_cutlass_library_bf16)
+
+# Custom target for building just this library
+add_custom_target(xe20_cutlass_library 
+  DEPENDS xe20_cutlass_library_bf16
+  COMMENT "Building XE20 CUTLASS Library BF16 GEMM Shared Library (.so)"
+)
+
+message(STATUS "Added shared library xe20_cutlass_library_bf16 for Python integration")

examples/11_xe20_cutlass_library/xe_20_cutlass_library_b16.cpp

@@ -0,0 +1,225 @@
+/***************************************************************************************************
+ * Copyright (C) 2025 Intel Corporation, All rights reserved.
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ***************************************************************************************************/
+
+
+
+#include <exception>
+#include <iostream>
+#include <memory>
+#include <random>
+#include <vector>
+
+#include "cute/tensor.hpp"
+#include "cutlass/cutlass.h"
+#include "cutlass/numeric_types.h"
+#include "cutlass/tensor_ref.h"
+#include "cutlass/util/host_tensor.h"
+#include "cutlass/util/reference/host/tensor_fill.h"
+#include "cutlass/util/reference/device/tensor_fill.h"
+#include "cutlass/util/device_memory.h"
+
+#include "cutlass/gemm/gemm.h"
+#include "cutlass/gemm/device/gemm_universal.h"
+#include "cutlass/gemm/device/gemm_universal_adapter.h"
+#include "cutlass/gemm/kernel/gemm_universal.hpp"
+//#include "cutlass/gemm/device/gemm_sparse.h"
+#include "cutlass/gemm/collective/collective_builder.hpp"
+#include "cutlass/epilogue/collective/collective_builder.hpp"
+#include "cutlass/epilogue/collective/default_epilogue.hpp"
+#include "cutlass/epilogue/thread/linear_combination.h"
+#include "cutlass/epilogue/thread/activation.h"
+#include "cutlass/gemm/dispatch_policy.hpp"
+#include "cutlass/gemm/kernel/tile_scheduler.hpp"
+#include "cutlass/tensor_ref.h"
+#include "cutlass/util/distribution.h"
+#include "cutlass/util/packed_stride.hpp"
+#include "cutlass/util/tensor_view_io.h"
+
+
+// We compile all models with -fvisibility=hidden. Any symbols that need to be
+// exposed in the final shared library must be declared with PT_EXPORT to make
+// them visible.
+#ifdef __GNUC__ // Applies to any compiler with GNU extensions (clang and g++)
+#define PT_EXPORT __attribute__((__visibility__("default")))
+#else
+#ifdef _WIN32
+#define PT_EXPORT __declspec(dllexport)
+#else
+#define PT_EXPORT
+#endif
+#endif
+
+using namespace cute;
+#define CUTLASS_CHECK(status)                                                      \
+{                                                                                  \
+  cutlass::Status error = status;                                                  \
+  if (error != cutlass::Status::kSuccess) {                                        \
+    auto msg = std::string("[") + __FILE__ + "] Got cutlass error: " +             \
+        cutlassGetStatusString(error) + " at: " + std::to_string(__LINE__);        \
+    throw std::runtime_error(msg);                                                 \
+  }                                                                                \
+}
+
+// Used as pass-through functor in EVT just for type casting / rounding
+template <typename T>
+struct identity_op {
+  CUTLASS_HOST_DEVICE
+  T operator()(T val) const { return val; }
+};
+
+
+
+using cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_epilogue =
+  typename cutlass::epilogue::collective::CollectiveBuilder<
+    cutlass::arch::Xe20, cutlass::arch::OpClassTensorOp,
+    cute::Shape<cute::_256, cute::_256, cute::_32>,
+    cute::Shape<cute::_1, cute::_1, cute::_1>,
+    cutlass::epilogue::collective::EpilogueTileAuto,
+    float, float,
+    float, cutlass::layout::RowMajor, 4,
+    float, cutlass::layout::RowMajor, 4,
+    cutlass::epilogue::collective::EpilogueScheduleAuto,
+    cutlass::epilogue::fusion::LinearCombination<
+      float,
+      float,
+      float,
+      float
+    >
+  >::CollectiveOp;
+
+using cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_mainloop =
+  typename cutlass::gemm::collective::CollectiveBuilder<
+    cutlass::arch::Xe20, cutlass::arch::OpClassTensorOp,
+    cutlass::bfloat16_t, cutlass::layout::ColumnMajor, 8,
+    cutlass::bfloat16_t, cutlass::layout::ColumnMajor, 8,
+    float,
+    cute::Shape<cute::_256, cute::_256, cute::_32>,
+    cute::Shape<cute::_1, cute::_1, cute::_1>,
+    cutlass::gemm::collective::StageCountAuto,
+    cutlass::gemm::collective::KernelScheduleAuto
+  >::CollectiveOp;
+
+// Gemm operator cutlass3x_xe11_tensorop_gemm_bf16_128x256_16x0_tn_align2
+using cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_base = cutlass::gemm::kernel::GemmUniversal<
+    cute::Shape<int,int,int,int>,
+    cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_mainloop,
+    cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_epilogue,
+    cutlass::gemm::PersistentScheduler>;
+
+// Define named type
+struct cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8 :
+public cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_base { };
+
+
+  using cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_device_type = cutlass::gemm::device::GemmUniversalAdapter<cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8>;
+
+// When workspace_size is not a nullptr, populates requested workspace_size and returns.
+// Otherwise, computes the Gemm kernel using the given workspace ptr.
+extern "C" {
+PT_EXPORT int sycl_tla_gemm_xe20_bf16(const uint16_t* X, const uint16_t* W, uint16_t* Y, const int M, const int N, const int K, const int B, const int lda, const int ldb, const int ldc, const int ldd, const int X_offset, const int W_offset, const int Y_offset, const uint8_t swizzle, size_t* workspace_size, uint8_t* workspace, sycl::queue* stream) {
+  try {
+  using ElementComputeEpilogue = cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_device_type::ElementAccumulator;
+  using coord_t = cutlass::gemm::GemmCoord::Index;
+  static cutlass::KernelHardwareInfo hw_info;
+  if (hw_info.sm_count == 0) {
+    hw_info.sm_count = cutlass::KernelHardwareInfo::query_device_multiprocessor_count(0);
+    CUTLASS_TRACE_HOST("Query result for SM count per device: " << hw_info.sm_count);
+  }
+
+  // Initialize GemmUniversal3xInstance arguments using constructor
+  cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_device_type::Arguments arguments{
+    cutlass::gemm::GemmUniversalMode::kGemm,  // GemmUniversalMode mode
+    {
+      static_cast<coord_t>(M),
+      static_cast<coord_t>(N),
+      static_cast<coord_t>(K),
+      static_cast<coord_t>(B)
+    }, // ProblemShape problem_shape
+    {
+      (cutlass::bfloat16_t*)(X + X_offset),  // ElementA const* ptr_A
+      cute::make_tuple(cute::Int<1>{}, int64_t(lda), int64_t(0)),  // StrideA dA (column-major: stride_m=1, stride_n=lda, batch=0)
+      (cutlass::bfloat16_t*)(W + W_offset),  // ElementB const* ptr_B
+      cute::make_tuple(int64_t(ldb), cute::Int<1>{}, int64_t(0)),  // StrideB dB (column-major: stride_m=ldb, stride_n=1, batch=0)
+    },  // MainloopArguments mainloop
+
+    // see https://tinyurl.com/4rk89z48
+    {
+      {ElementComputeEpilogue(1), ElementComputeEpilogue(0)},  // thread, typename FusionCallbacks::Arguments ( EVT ) or ThreadEpilogueOp::Params (non-EVT )
+      nullptr,  // ElementC const* ptr_C
+      cute::make_tuple(int64_t(0), cute::Int<1>{}, int64_t(0)),  // StrideC dC (row-major: stride_m, stride_n=1, batch=0)
+      (float*)(Y + Y_offset),  // ElementD ptr_D (output is float, not bfloat16)
+      cute::make_tuple(int64_t(ldd), cute::Int<1>{}, int64_t(0)),  // StrideD dD (row-major: stride_m=ldd, stride_n=1, batch=0)
+    },  // EpilogueArguments epilogue,
+    hw_info
+  };
+  arguments.scheduler.max_swizzle_size = swizzle;
+  cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8_device_type gemm_op;
+  if (workspace_size) {
+    *workspace_size = gemm_op.get_workspace_size(arguments);
+    return 0;
+  }
+  // check for null pointers after workspace size, since querying workspace size doesn't require valid data pointers
+#ifndef CUTLASS_BACKEND_DISABLE_CHECKS
+  {
+    auto status = gemm_op.can_implement(arguments);
+    CUTLASS_CHECK(status);
+  }
+#endif
+#ifdef CUTLASS_DEBUG_TRACE_LEVEL
+#if CUTLASS_DEBUG_TRACE_LEVEL == 1
+  {
+    // Print the maximum number of active blocks per SM for the kernel if CUTLASS_DEBUG_TRACE_LEVEL == 1
+    // we don't need a print statement, it's happening inside the function.
+    gemm_op.maximum_active_blocks();
+  }
+#endif
+#endif
+  {
+    auto status = gemm_op.initialize(arguments, workspace, stream);
+    CUTLASS_CHECK(status);
+  }
+  {
+    auto status = gemm_op(stream);
+    CUTLASS_CHECK(status);
+  }
+  }
+  catch (std::exception& e) {
+    std::cerr << "Runtime error: " << e.what() << std::endl;
+    return -1;
+  }
+  catch (...) {
+    return -1;
+  }
+  return 0;
+}
+}
+
+// configuration name: cutlass3x_xe20_tensorop_gemm_bf16_256x256_32x0_nn_align8

examples/CMakeLists.txt

@@ -113,6 +113,7 @@ if(CUTLASS_ENABLE_SYCL)
       08_bmg_gemm_f8
       09_bmg_grouped_gemm_f8
       10_bmg_grouped_gemm_mixed_dtype
+      11_xe20_cutlass_library
       )
       add_subdirectory(${EXAMPLE})
     endforeach()