set(LIBOMPTARGET_BUILD_DEVICERTL_BCLIB TRUE CACHE BOOL
"Can be set to false to disable building this library.")
if (NOT LIBOMPTARGET_BUILD_DEVICERTL_BCLIB)
message(STATUS "Not building DeviceRTL: Disabled by LIBOMPTARGET_BUILD_DEVICERTL_BCLIB")
return()
endif()
# Check to ensure the host system is a supported host architecture.
if(NOT ${CMAKE_SIZEOF_VOID_P} EQUAL "8")
message(STATUS "Not building DeviceRTL: Runtime does not support 32-bit hosts")
return()
endif()
if (LLVM_DIR)
# Builds that use pre-installed LLVM have LLVM_DIR set.
# A standalone or LLVM_ENABLE_RUNTIMES=openmp build takes this route
find_program(CLANG_TOOL clang PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
find_program(PACKAGER_TOOL clang-offload-packager PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
find_program(LINK_TOOL llvm-link PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
find_program(OPT_TOOL opt PATHS ${LLVM_TOOLS_BINARY_DIR} NO_DEFAULT_PATH)
if ((NOT CLANG_TOOL) OR (NOT LINK_TOOL) OR (NOT OPT_TOOL) OR (NOT PACKAGER_TOOL))
message(STATUS "Not building DeviceRTL. Missing clang: ${CLANG_TOOL}, llvm-link: ${LINK_TOOL}, opt: ${OPT_TOOL}, or clang-offload-packager: ${PACKAGER_TOOL}")
return()
else()
message(STATUS "Building DeviceRTL. Using clang: ${CLANG_TOOL}, llvm-link: ${LINK_TOOL} and opt: ${OPT_TOOL}")
endif()
elseif (LLVM_TOOL_CLANG_BUILD AND NOT CMAKE_CROSSCOMPILING AND NOT OPENMP_STANDALONE_BUILD)
# LLVM in-tree builds may use CMake target names to discover the tools.
# A LLVM_ENABLE_PROJECTS=openmp build takes this route
set(CLANG_TOOL $<TARGET_FILE:clang>)
set(PACKAGER_TOOL $<TARGET_FILE:clang-offload-packager>)
set(LINK_TOOL $<TARGET_FILE:llvm-link>)
set(OPT_TOOL $<TARGET_FILE:opt>)
message(STATUS "Building DeviceRTL. Using clang from in-tree build")
else()
message(STATUS "Not building DeviceRTL. No appropriate clang found")
return()
endif()
set(devicertl_base_directory ${CMAKE_CURRENT_SOURCE_DIR})
set(include_directory ${devicertl_base_directory}/include)
set(source_directory ${devicertl_base_directory}/src)
set(all_amdgpu_architectures "gfx700;gfx701;gfx801;gfx803;gfx900;gfx902;gfx906"
"gfx908;gfx90a;gfx90c;gfx940;gfx941;gfx942;gfx1010"
"gfx1030;gfx1031;gfx1032;gfx1033;gfx1034;gfx1035"
"gfx1036;gfx1100;gfx1101;gfx1102;gfx1103;gfx1150"
"gfx1151;gfx1152")
set(all_nvptx_architectures "sm_35;sm_37;sm_50;sm_52;sm_53;sm_60;sm_61;sm_62"
"sm_70;sm_72;sm_75;sm_80;sm_86;sm_87;sm_89;sm_90")
set(all_gpu_architectures
"${all_amdgpu_architectures};${all_nvptx_architectures}")
set(LIBOMPTARGET_DEVICE_ARCHITECTURES "all" CACHE STRING
"List of device architectures to be used to compile the OpenMP DeviceRTL.")
if(LIBOMPTARGET_DEVICE_ARCHITECTURES STREQUAL "all")
set(LIBOMPTARGET_DEVICE_ARCHITECTURES ${all_gpu_architectures})
elseif(LIBOMPTARGET_DEVICE_ARCHITECTURES STREQUAL "auto" OR
LIBOMPTARGET_DEVICE_ARCHITECTURES STREQUAL "native")
if(NOT LIBOMPTARGET_NVPTX_ARCH AND NOT LIBOMPTARGET_AMDGPU_ARCH)
message(FATAL_ERROR
"Could not find 'amdgpu-arch' and 'nvptx-arch' tools required for 'auto'")
elseif(NOT LIBOMPTARGET_FOUND_NVIDIA_GPU AND NOT LIBOMPTARGET_FOUND_AMDGPU_GPU)
message(FATAL_ERROR "No AMD or NVIDIA GPU found on the system when using 'auto'")
endif()
set(LIBOMPTARGET_DEVICE_ARCHITECTURES
"${LIBOMPTARGET_NVPTX_DETECTED_ARCH_LIST};${LIBOMPTARGET_AMDGPU_DETECTED_ARCH_LIST}")
endif()
list(REMOVE_DUPLICATES LIBOMPTARGET_DEVICE_ARCHITECTURES)
set(include_files
${include_directory}/Allocator.h
${include_directory}/Configuration.h
${include_directory}/Debug.h
${include_directory}/Interface.h
${include_directory}/LibC.h
${include_directory}/Mapping.h
${include_directory}/Profiling.h
${include_directory}/State.h
${include_directory}/Synchronization.h
${include_directory}/Types.h
${include_directory}/Utils.h
${include_directory}/Workshare.h
)
set(src_files
${source_directory}/Allocator.cpp
${source_directory}/Configuration.cpp
${source_directory}/Debug.cpp
${source_directory}/Kernel.cpp
${source_directory}/LibC.cpp
${source_directory}/Mapping.cpp
${source_directory}/Misc.cpp
${source_directory}/Parallelism.cpp
${source_directory}/Profiling.cpp
${source_directory}/Reduction.cpp
${source_directory}/State.cpp
${source_directory}/Synchronization.cpp
${source_directory}/Tasking.cpp
${source_directory}/Utils.cpp
${source_directory}/Workshare.cpp
)
# We disable the slp vectorizer during the runtime optimization to avoid
# vectorized accesses to the shared state. Generally, those are "good" but
# the optimizer pipeline (esp. Attributor) does not fully support vectorized
# instructions yet and we end up missing out on way more important constant
# propagation. That said, we will run the vectorizer again after the runtime
# has been linked into the user program.
set(clang_opt_flags -O3 -mllvm -openmp-opt-disable -DSHARED_SCRATCHPAD_SIZE=512 -mllvm -vectorize-slp=false )
set(link_opt_flags -O3 -openmp-opt-disable -attributor-enable=module -vectorize-slp=false )
set(link_export_flag -passes=internalize -internalize-public-api-file=${source_directory}/exports)
# If the user built with the GPU C library enabled we will use that instead.
if(${LIBOMPTARGET_GPU_LIBC_SUPPORT})
list(APPEND clang_opt_flags -DOMPTARGET_HAS_LIBC)
endif()
# Prepend -I to each list element
set (LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL "${LIBOMPTARGET_LLVM_INCLUDE_DIRS}")
list(TRANSFORM LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL PREPEND "-I")
# Set flags for LLVM Bitcode compilation.
set(bc_flags -c -foffload-lto -std=c++17 -fvisibility=hidden
${clang_opt_flags} --offload-device-only
-nocudalib -nogpulib -nostdinc
-fopenmp -fopenmp-cuda-mode
-Wno-unknown-cuda-version
-DOMPTARGET_DEVICE_RUNTIME
-I${include_directory}
-I${devicertl_base_directory}/../include
${LIBOMPTARGET_LLVM_INCLUDE_DIRS_DEVICERTL}
)
# first create an object target
add_library(omptarget.devicertl.all_objs OBJECT IMPORTED)
function(compileDeviceRTLLibrary target_cpu target_name target_triple)
set(target_bc_flags ${ARGN})
set(bc_files "")
foreach(src ${src_files})
get_filename_component(infile ${src} ABSOLUTE)
get_filename_component(outfile ${src} NAME)
set(outfile "${outfile}-${target_cpu}.bc")
set(depfile "${outfile}.d")
add_custom_command(OUTPUT ${outfile}
COMMAND ${CLANG_TOOL}
${bc_flags}
--offload-arch=${target_cpu}
${target_bc_flags}
-MD -MF ${depfile}
${infile} -o ${outfile}
DEPENDS ${infile}
DEPFILE ${depfile}
COMMENT "Building LLVM bitcode ${outfile}"
VERBATIM
)
if(TARGET clang)
# Add a file-level dependency to ensure that clang is up-to-date.
# By default, add_custom_command only builds clang if the
# executable is missing.
add_custom_command(OUTPUT ${outfile}
DEPENDS clang
APPEND
)
endif()
set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${outfile})
list(APPEND bc_files ${outfile})
endforeach()
set(bclib_name "libomptarget-${target_name}-${target_cpu}.bc")
# Link to a bitcode library.
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
COMMAND ${LINK_TOOL}
-o ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name} ${bc_files}
DEPENDS ${bc_files}
COMMENT "Linking LLVM bitcode ${bclib_name}"
)
if(TARGET llvm-link)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
DEPENDS llvm-link
APPEND)
endif()
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
COMMAND ${OPT_TOOL} ${link_export_flag} ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
-o ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
DEPENDS ${source_directory}/exports ${CMAKE_CURRENT_BINARY_DIR}/linked_${bclib_name}
COMMENT "Internalizing LLVM bitcode ${bclib_name}"
)
if(TARGET opt)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
DEPENDS opt
APPEND)
endif()
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
COMMAND ${OPT_TOOL} ${link_opt_flags} ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
-o ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/internalized_${bclib_name}
COMMENT "Optimizing LLVM bitcode ${bclib_name}"
)
if(TARGET opt)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
DEPENDS opt
APPEND)
endif()
set(bclib_target_name "omptarget-${target_name}-${target_cpu}-bc")
add_custom_target(${bclib_target_name} DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name})
# Copy library to destination.
add_custom_command(TARGET ${bclib_target_name} POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
${LIBOMPTARGET_LIBRARY_DIR})
add_dependencies(omptarget.devicertl.${target_name} ${bclib_target_name})
set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${bclib_name} ${LIBOMPTARGET_LIBRARY_DIR}/${bclib_name})
# Install bitcode library under the lib destination folder.
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name} DESTINATION "${OFFLOAD_INSTALL_LIBDIR}")
set(target_feature "")
if("${target_triple}" STREQUAL "nvptx64-nvidia-cuda")
set(target_feature "feature=+ptx63")
endif()
# Package the bitcode in the bitcode and embed it in an ELF for the static library
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/packaged_${bclib_name}
COMMAND ${PACKAGER_TOOL} -o ${CMAKE_CURRENT_BINARY_DIR}/packaged_${bclib_name}
"--image=file=${CMAKE_CURRENT_BINARY_DIR}/${bclib_name},${target_feature},triple=${target_triple},arch=${target_cpu},kind=openmp"
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/${bclib_name}
COMMENT "Packaging LLVM offloading binary ${bclib_name}.out"
)
if(TARGET clang-offload-packager)
add_custom_command(OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/packaged_${bclib_name}
DEPENDS clang-offload-packager
APPEND)
endif()
set(output_name "${CMAKE_CURRENT_BINARY_DIR}/devicertl-${target_name}-${target_cpu}.o")
add_custom_command(OUTPUT ${output_name}
COMMAND ${CLANG_TOOL} --std=c++17 -c -nostdlib
-Xclang -fembed-offload-object=${CMAKE_CURRENT_BINARY_DIR}/packaged_${bclib_name}
-o ${output_name}
${source_directory}/Stub.cpp
DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/packaged_${bclib_name} ${source_directory}/Stub.cpp
COMMENT "Embedding LLVM offloading binary in devicertl-${target_name}-${target_cpu}.o"
VERBATIM
)
if(TARGET clang)
add_custom_command(OUTPUT ${output_name}
DEPENDS clang
APPEND)
endif()
set_property(DIRECTORY APPEND PROPERTY ADDITIONAL_MAKE_CLEAN_FILES ${output_name})
set_property(TARGET omptarget.devicertl.all_objs APPEND PROPERTY IMPORTED_OBJECTS ${output_name})
if (CMAKE_EXPORT_COMPILE_COMMANDS)
set(ide_target_name omptarget-ide-${target_name}-${target_cpu})
add_library(${ide_target_name} STATIC EXCLUDE_FROM_ALL ${src_files})
target_compile_options(${ide_target_name} PRIVATE
-fopenmp --offload-arch=${target_cpu} -fopenmp-cuda-mode
-mllvm -openmp-opt-disable
-foffload-lto -fvisibility=hidden --offload-device-only
-nocudalib -nogpulib -nostdinc -Wno-unknown-cuda-version
)
target_compile_definitions(${ide_target_name} PRIVATE SHARED_SCRATCHPAD_SIZE=512)
target_include_directories(${ide_target_name} PRIVATE
${include_directory}
${devicertl_base_directory}/../include
${LIBOMPTARGET_LLVM_INCLUDE_DIRS}
)
install(TARGETS ${ide_target_name} EXCLUDE_FROM_ALL)
endif()
endfunction()
# Generate a Bitcode library for all the gpu architectures the user requested.
add_custom_target(omptarget.devicertl.nvptx)
add_custom_target(omptarget.devicertl.amdgpu)
foreach(gpu_arch ${LIBOMPTARGET_DEVICE_ARCHITECTURES})
if("${gpu_arch}" IN_LIST all_amdgpu_architectures)
compileDeviceRTLLibrary(${gpu_arch} amdgpu amdgcn-amd-amdhsa -Xclang -mcode-object-version=none)
elseif("${gpu_arch}" IN_LIST all_nvptx_architectures)
compileDeviceRTLLibrary(${gpu_arch} nvptx nvptx64-nvidia-cuda --cuda-feature=+ptx63)
else()
message(FATAL_ERROR "Unknown GPU architecture '${gpu_arch}'")
endif()
endforeach()
# Archive all the object files generated above into a static library
add_library(omptarget.devicertl STATIC)
set_target_properties(omptarget.devicertl PROPERTIES
ARCHIVE_OUTPUT_DIRECTORY "${LIBOMPTARGET_LLVM_LIBRARY_INTDIR}"
LINKER_LANGUAGE CXX
)
target_link_libraries(omptarget.devicertl PRIVATE omptarget.devicertl.all_objs)
install(TARGETS omptarget.devicertl ARCHIVE DESTINATION ${OFFLOAD_INSTALL_LIBDIR})
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