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Current File : //usr/share/cmake3/Modules/FindCUDA/select_compute_arch.cmake
# Synopsis:
#   CUDA_SELECT_NVCC_ARCH_FLAGS(out_variable [target_CUDA_architectures])
#   -- Selects GPU arch flags for nvcc based on target_CUDA_architectures
#      target_CUDA_architectures : Auto | Common | All | LIST(ARCH_AND_PTX ...)
#       - "Auto" detects local machine GPU compute arch at runtime.
#       - "Common" and "All" cover common and entire subsets of architectures
#      ARCH_AND_PTX : NAME | NUM.NUM | NUM.NUM(NUM.NUM) | NUM.NUM+PTX
#      NAME: Fermi Kepler Maxwell Kepler+Tegra Kepler+Tesla Maxwell+Tegra Pascal Volta Turing
#      NUM: Any number. Only those pairs are currently accepted by NVCC though:
#            2.0 2.1 3.0 3.2 3.5 3.7 5.0 5.2 5.3 6.0 6.2 7.0 7.2 7.5
#      Returns LIST of flags to be added to CUDA_NVCC_FLAGS in ${out_variable}
#      Additionally, sets ${out_variable}_readable to the resulting numeric list
#      Example:
#       CUDA_SELECT_NVCC_ARCH_FLAGS(ARCH_FLAGS 3.0 3.5+PTX 5.2(5.0) Maxwell)
#        LIST(APPEND CUDA_NVCC_FLAGS ${ARCH_FLAGS})
#
#      More info on CUDA architectures: https://en.wikipedia.org/wiki/CUDA
#

if(CMAKE_CUDA_COMPILER_LOADED) # CUDA as a language
  if(CMAKE_CUDA_COMPILER_ID STREQUAL "NVIDIA"
      AND CMAKE_CUDA_COMPILER_VERSION MATCHES "^([0-9]+\\.[0-9]+)")
    set(CUDA_VERSION "${CMAKE_MATCH_1}")
  endif()
endif()

# See: https://docs.nvidia.com/cuda/cuda-compiler-driver-nvcc/index.html#gpu-feature-list

# This list will be used for CUDA_ARCH_NAME = All option
set(CUDA_KNOWN_GPU_ARCHITECTURES  "Fermi" "Kepler" "Maxwell")

# This list will be used for CUDA_ARCH_NAME = Common option (enabled by default)
set(CUDA_COMMON_GPU_ARCHITECTURES "3.0" "3.5" "5.0")

if(CUDA_VERSION VERSION_LESS "7.0")
  set(CUDA_LIMIT_GPU_ARCHITECTURE "5.2")
endif()

# This list is used to filter CUDA archs when autodetecting
set(CUDA_ALL_GPU_ARCHITECTURES "3.0" "3.2" "3.5" "5.0")

if(CUDA_VERSION VERSION_GREATER_EQUAL "7.0")
  list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Kepler+Tegra" "Kepler+Tesla" "Maxwell+Tegra")
  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "5.2")

  if(CUDA_VERSION VERSION_LESS "8.0")
    list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "5.2+PTX")
    set(CUDA_LIMIT_GPU_ARCHITECTURE "6.0")
  endif()
endif()

if(CUDA_VERSION VERSION_GREATER_EQUAL "8.0")
  list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Pascal")
  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "6.0" "6.1")
  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "6.0" "6.1" "6.2")

  if(CUDA_VERSION VERSION_LESS "9.0")
    list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "6.1+PTX")
    set(CUDA_LIMIT_GPU_ARCHITECTURE "7.0")
  endif()
endif ()

if(CUDA_VERSION VERSION_GREATER_EQUAL "9.0")
  list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Volta")
  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.0" "7.0+PTX")
  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "7.0" "7.0+PTX" "7.2" "7.2+PTX")

  if(CUDA_VERSION VERSION_LESS "10.0")
    set(CUDA_LIMIT_GPU_ARCHITECTURE "8.0")
  endif()
endif()

if(CUDA_VERSION VERSION_GREATER_EQUAL "10.0")
  list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Turing")
  list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "7.5" "7.5+PTX")
  list(APPEND CUDA_ALL_GPU_ARCHITECTURES "7.5" "7.5+PTX")

  if(CUDA_VERSION VERSION_LESS "11.0")
    set(CUDA_LIMIT_GPU_ARCHITECTURE "9.0")
  endif()
endif()

################################################################################################
# A function for automatic detection of GPUs installed  (if autodetection is enabled)
# Usage:
#   CUDA_DETECT_INSTALLED_GPUS(OUT_VARIABLE)
#
function(CUDA_DETECT_INSTALLED_GPUS OUT_VARIABLE)
  if(NOT CUDA_GPU_DETECT_OUTPUT)
    if(CMAKE_CUDA_COMPILER_LOADED) # CUDA as a language
      set(file "${PROJECT_BINARY_DIR}/detect_cuda_compute_capabilities.cu")
    else()
      set(file "${PROJECT_BINARY_DIR}/detect_cuda_compute_capabilities.cpp")
    endif()

    file(WRITE ${file} ""
      "#include <cuda_runtime.h>\n"
      "#include <cstdio>\n"
      "int main()\n"
      "{\n"
      "  int count = 0;\n"
      "  if (cudaSuccess != cudaGetDeviceCount(&count)) return -1;\n"
      "  if (count == 0) return -1;\n"
      "  for (int device = 0; device < count; ++device)\n"
      "  {\n"
      "    cudaDeviceProp prop;\n"
      "    if (cudaSuccess == cudaGetDeviceProperties(&prop, device))\n"
      "      std::printf(\"%d.%d \", prop.major, prop.minor);\n"
      "  }\n"
      "  return 0;\n"
      "}\n")

    if(CMAKE_CUDA_COMPILER_LOADED) # CUDA as a language
      try_run(run_result compile_result ${PROJECT_BINARY_DIR} ${file}
              RUN_OUTPUT_VARIABLE compute_capabilities)
    else()
      try_run(run_result compile_result ${PROJECT_BINARY_DIR} ${file}
              CMAKE_FLAGS "-DINCLUDE_DIRECTORIES=${CUDA_INCLUDE_DIRS}"
              LINK_LIBRARIES ${CUDA_LIBRARIES}
              RUN_OUTPUT_VARIABLE compute_capabilities)
    endif()

    # Filter unrelated content out of the output.
    string(REGEX MATCHALL "[0-9]+\\.[0-9]+" compute_capabilities "${compute_capabilities}")

    if(run_result EQUAL 0)
      string(REPLACE "2.1" "2.1(2.0)" compute_capabilities "${compute_capabilities}")
      set(CUDA_GPU_DETECT_OUTPUT ${compute_capabilities}
        CACHE INTERNAL "Returned GPU architectures from detect_gpus tool" FORCE)
    endif()
  endif()

  if(NOT CUDA_GPU_DETECT_OUTPUT)
    message(STATUS "Automatic GPU detection failed. Building for common architectures.")
    set(${OUT_VARIABLE} ${CUDA_COMMON_GPU_ARCHITECTURES} PARENT_SCOPE)
  else()
    # Filter based on CUDA version supported archs
    set(CUDA_GPU_DETECT_OUTPUT_FILTERED "")
    separate_arguments(CUDA_GPU_DETECT_OUTPUT)
    foreach(ITEM IN ITEMS ${CUDA_GPU_DETECT_OUTPUT})
        if(CUDA_LIMIT_GPU_ARCHITECTURE AND ITEM VERSION_GREATER_EQUAL CUDA_LIMIT_GPU_ARCHITECTURE)
        list(GET CUDA_COMMON_GPU_ARCHITECTURES -1 NEWITEM)
        string(APPEND CUDA_GPU_DETECT_OUTPUT_FILTERED " ${NEWITEM}")
      else()
        string(APPEND CUDA_GPU_DETECT_OUTPUT_FILTERED " ${ITEM}")
      endif()
    endforeach()

    set(${OUT_VARIABLE} ${CUDA_GPU_DETECT_OUTPUT_FILTERED} PARENT_SCOPE)
  endif()
endfunction()


################################################################################################
# Function for selecting GPU arch flags for nvcc based on CUDA architectures from parameter list
# Usage:
#   SELECT_NVCC_ARCH_FLAGS(out_variable [list of CUDA compute archs])
function(CUDA_SELECT_NVCC_ARCH_FLAGS out_variable)
  set(CUDA_ARCH_LIST "${ARGN}")

  if("X${CUDA_ARCH_LIST}" STREQUAL "X" )
    set(CUDA_ARCH_LIST "Auto")
  endif()

  set(cuda_arch_bin)
  set(cuda_arch_ptx)

  if("${CUDA_ARCH_LIST}" STREQUAL "All")
    set(CUDA_ARCH_LIST ${CUDA_KNOWN_GPU_ARCHITECTURES})
  elseif("${CUDA_ARCH_LIST}" STREQUAL "Common")
    set(CUDA_ARCH_LIST ${CUDA_COMMON_GPU_ARCHITECTURES})
  elseif("${CUDA_ARCH_LIST}" STREQUAL "Auto")
    CUDA_DETECT_INSTALLED_GPUS(CUDA_ARCH_LIST)
    message(STATUS "Autodetected CUDA architecture(s): ${CUDA_ARCH_LIST}")
  endif()

  # Now process the list and look for names
  string(REGEX REPLACE "[ \t]+" ";" CUDA_ARCH_LIST "${CUDA_ARCH_LIST}")
  list(REMOVE_DUPLICATES CUDA_ARCH_LIST)
  foreach(arch_name ${CUDA_ARCH_LIST})
    set(arch_bin)
    set(arch_ptx)
    set(add_ptx FALSE)
    # Check to see if we are compiling PTX
    if(arch_name MATCHES "(.*)\\+PTX$")
      set(add_ptx TRUE)
      set(arch_name ${CMAKE_MATCH_1})
    endif()
    if(arch_name MATCHES "^([0-9]\\.[0-9](\\([0-9]\\.[0-9]\\))?)$")
      set(arch_bin ${CMAKE_MATCH_1})
      set(arch_ptx ${arch_bin})
    else()
      # Look for it in our list of known architectures
      if(${arch_name} STREQUAL "Fermi")
        set(arch_bin 2.0 "2.1(2.0)")
      elseif(${arch_name} STREQUAL "Kepler+Tegra")
        set(arch_bin 3.2)
      elseif(${arch_name} STREQUAL "Kepler+Tesla")
        set(arch_bin 3.7)
      elseif(${arch_name} STREQUAL "Kepler")
        set(arch_bin 3.0 3.5)
        set(arch_ptx 3.5)
      elseif(${arch_name} STREQUAL "Maxwell+Tegra")
        set(arch_bin 5.3)
      elseif(${arch_name} STREQUAL "Maxwell")
        set(arch_bin 5.0 5.2)
        set(arch_ptx 5.2)
      elseif(${arch_name} STREQUAL "Pascal")
        set(arch_bin 6.0 6.1)
        set(arch_ptx 6.1)
      elseif(${arch_name} STREQUAL "Volta")
        set(arch_bin 7.0 7.0)
        set(arch_ptx 7.0)
      elseif(${arch_name} STREQUAL "Turing")
        set(arch_bin 7.5)
        set(arch_ptx 7.5)
      else()
        message(SEND_ERROR "Unknown CUDA Architecture Name ${arch_name} in CUDA_SELECT_NVCC_ARCH_FLAGS")
      endif()
    endif()
    if(NOT arch_bin)
      message(SEND_ERROR "arch_bin wasn't set for some reason")
    endif()
    list(APPEND cuda_arch_bin ${arch_bin})
    if(add_ptx)
      if (NOT arch_ptx)
        set(arch_ptx ${arch_bin})
      endif()
      list(APPEND cuda_arch_ptx ${arch_ptx})
    endif()
  endforeach()

  # remove dots and convert to lists
  string(REGEX REPLACE "\\." "" cuda_arch_bin "${cuda_arch_bin}")
  string(REGEX REPLACE "\\." "" cuda_arch_ptx "${cuda_arch_ptx}")
  string(REGEX MATCHALL "[0-9()]+" cuda_arch_bin "${cuda_arch_bin}")
  string(REGEX MATCHALL "[0-9]+"   cuda_arch_ptx "${cuda_arch_ptx}")

  if(cuda_arch_bin)
    list(REMOVE_DUPLICATES cuda_arch_bin)
  endif()
  if(cuda_arch_ptx)
    list(REMOVE_DUPLICATES cuda_arch_ptx)
  endif()

  set(nvcc_flags "")
  set(nvcc_archs_readable "")

  # Tell NVCC to add binaries for the specified GPUs
  foreach(arch ${cuda_arch_bin})
    if(arch MATCHES "([0-9]+)\\(([0-9]+)\\)")
      # User explicitly specified ARCH for the concrete CODE
      list(APPEND nvcc_flags -gencode arch=compute_${CMAKE_MATCH_2},code=sm_${CMAKE_MATCH_1})
      list(APPEND nvcc_archs_readable sm_${CMAKE_MATCH_1})
    else()
      # User didn't explicitly specify ARCH for the concrete CODE, we assume ARCH=CODE
      list(APPEND nvcc_flags -gencode arch=compute_${arch},code=sm_${arch})
      list(APPEND nvcc_archs_readable sm_${arch})
    endif()
  endforeach()

  # Tell NVCC to add PTX intermediate code for the specified architectures
  foreach(arch ${cuda_arch_ptx})
    list(APPEND nvcc_flags -gencode arch=compute_${arch},code=compute_${arch})
    list(APPEND nvcc_archs_readable compute_${arch})
  endforeach()

  string(REPLACE ";" " " nvcc_archs_readable "${nvcc_archs_readable}")
  set(${out_variable}          ${nvcc_flags}          PARENT_SCOPE)
  set(${out_variable}_readable ${nvcc_archs_readable} PARENT_SCOPE)
endfunction()
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