196 lines
7.3 KiB
CMake
196 lines
7.3 KiB
CMake
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# Synopsis:
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# CUDA_SELECT_NVCC_ARCH_FLAGS(out_variable [target_CUDA_architectures])
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# -- Selects GPU arch flags for nvcc based on target_CUDA_architectures
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# target_CUDA_architectures : Auto | Common | All | LIST(ARCH_AND_PTX ...)
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# - "Auto" detects local machine GPU compute arch at runtime.
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# - "Common" and "All" cover common and entire subsets of architectures
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# ARCH_AND_PTX : NAME | NUM.NUM | NUM.NUM(NUM.NUM) | NUM.NUM+PTX
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# NAME: Fermi Kepler Maxwell Kepler+Tegra Kepler+Tesla Maxwell+Tegra Pascal
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# NUM: Any number. Only those pairs are currently accepted by NVCC though:
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# 2.0 2.1 3.0 3.2 3.5 3.7 5.0 5.2 5.3 6.0 6.2
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# Returns LIST of flags to be added to CUDA_NVCC_FLAGS in ${out_variable}
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# Additionally, sets ${out_variable}_readable to the resulting numeric list
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# Example:
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# CUDA_SELECT_NVCC_ARCH_FLAGS(ARCH_FLAGS 3.0 3.5+PTX 5.2(5.0) Maxwell)
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# LIST(APPEND CUDA_NVCC_FLAGS ${ARCH_FLAGS})
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#
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# More info on CUDA architectures: https://en.wikipedia.org/wiki/CUDA
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#
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# This list will be used for CUDA_ARCH_NAME = All option
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set(CUDA_KNOWN_GPU_ARCHITECTURES "Fermi" "Kepler" "Maxwell")
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# This list will be used for CUDA_ARCH_NAME = Common option (enabled by default)
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set(CUDA_COMMON_GPU_ARCHITECTURES "3.0" "3.5" "5.0")
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if (CUDA_VERSION VERSION_GREATER "6.5")
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list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Kepler+Tegra" "Kepler+Tesla" "Maxwell+Tegra")
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list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "5.2")
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endif ()
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if (CUDA_VERSION VERSION_GREATER "7.5")
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list(APPEND CUDA_KNOWN_GPU_ARCHITECTURES "Pascal")
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list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "6.0" "6.1" "6.1+PTX")
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else()
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list(APPEND CUDA_COMMON_GPU_ARCHITECTURES "5.2+PTX")
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endif ()
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################################################################################################
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# A function for automatic detection of GPUs installed (if autodetection is enabled)
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# Usage:
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# CUDA_DETECT_INSTALLED_GPUS(OUT_VARIABLE)
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#
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function(CUDA_DETECT_INSTALLED_GPUS OUT_VARIABLE)
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if(NOT CUDA_GPU_DETECT_OUTPUT)
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set(cufile ${PROJECT_BINARY_DIR}/detect_cuda_archs.cu)
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file(WRITE ${cufile} ""
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"#include <cstdio>\n"
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"int main()\n"
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"{\n"
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" int count = 0;\n"
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" if (cudaSuccess != cudaGetDeviceCount(&count)) return -1;\n"
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" if (count == 0) return -1;\n"
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" for (int device = 0; device < count; ++device)\n"
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" {\n"
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" cudaDeviceProp prop;\n"
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" if (cudaSuccess == cudaGetDeviceProperties(&prop, device))\n"
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" std::printf(\"%d.%d \", prop.major, prop.minor);\n"
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" }\n"
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" return 0;\n"
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"}\n")
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execute_process(COMMAND "${CUDA_NVCC_EXECUTABLE}" "--run" "${cufile}"
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WORKING_DIRECTORY "${PROJECT_BINARY_DIR}/CMakeFiles/"
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RESULT_VARIABLE nvcc_res OUTPUT_VARIABLE nvcc_out
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ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
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if(nvcc_res EQUAL 0)
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string(REPLACE "2.1" "2.1(2.0)" nvcc_out "${nvcc_out}")
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set(CUDA_GPU_DETECT_OUTPUT ${nvcc_out} CACHE INTERNAL "Returned GPU architetures from detect_gpus tool" FORCE)
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endif()
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endif()
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if(NOT CUDA_GPU_DETECT_OUTPUT)
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message(STATUS "Automatic GPU detection failed. Building for common architectures.")
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set(${OUT_VARIABLE} ${CUDA_COMMON_GPU_ARCHITECTURES} PARENT_SCOPE)
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else()
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set(${OUT_VARIABLE} ${CUDA_GPU_DETECT_OUTPUT} PARENT_SCOPE)
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endif()
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endfunction()
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################################################################################################
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# Function for selecting GPU arch flags for nvcc based on CUDA architectures from parameter list
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# Usage:
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# SELECT_NVCC_ARCH_FLAGS(out_variable [list of CUDA compute archs])
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function(CUDA_SELECT_NVCC_ARCH_FLAGS out_variable)
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set(CUDA_ARCH_LIST "${ARGN}")
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if("X${CUDA_ARCH_LIST}" STREQUAL "X" )
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set(CUDA_ARCH_LIST "Auto")
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endif()
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set(cuda_arch_bin)
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set(cuda_arch_ptx)
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if("${CUDA_ARCH_LIST}" STREQUAL "All")
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set(CUDA_ARCH_LIST ${CUDA_KNOWN_GPU_ARCHITECTURES})
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elseif("${CUDA_ARCH_LIST}" STREQUAL "Common")
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set(CUDA_ARCH_LIST ${CUDA_COMMON_GPU_ARCHITECTURES})
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elseif("${CUDA_ARCH_LIST}" STREQUAL "Auto")
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CUDA_DETECT_INSTALLED_GPUS(CUDA_ARCH_LIST)
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message(STATUS "Autodetected CUDA architecture(s): ${cuda_arch_bin}")
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endif()
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# Now process the list and look for names
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string(REGEX REPLACE "[ \t]+" ";" CUDA_ARCH_LIST "${CUDA_ARCH_LIST}")
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list(REMOVE_DUPLICATES CUDA_ARCH_LIST)
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foreach(arch_name ${CUDA_ARCH_LIST})
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set(arch_bin)
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set(add_ptx FALSE)
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# Check to see if we are compiling PTX
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if(arch_name MATCHES "(.*)\\+PTX$")
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set(add_ptx TRUE)
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set(arch_name ${CMAKE_MATCH_1})
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endif()
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if(arch_name MATCHES "([0-9]\\.[0-9])$")
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set(arch_bin ${CMAKE_MATCH_1})
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set(arch_ptx ${arch_bin})
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else()
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# Look for it in our list of known architectures
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if(${arch_name} STREQUAL "Fermi")
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set(arch_bin 2.0 "2.1(2.0)")
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elseif(${arch_name} STREQUAL "Kepler+Tegra")
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set(arch_bin 3.2)
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elseif(${arch_name} STREQUAL "Kepler+Tesla")
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set(arch_bin 3.7)
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elseif(${arch_name} STREQUAL "Kepler")
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set(arch_bin 3.0 3.5)
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set(arch_ptx 3.5)
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elseif(${arch_name} STREQUAL "Maxwell+Tegra")
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set(arch_bin 5.3)
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elseif(${arch_name} STREQUAL "Maxwell")
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set(arch_bin 5.0 5.2)
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set(arch_ptx 5.2)
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elseif(${arch_name} STREQUAL "Pascal")
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set(arch_bin 6.0 6.1)
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set(arch_ptx 6.1)
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else()
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message(SEND_ERROR "Unknown CUDA Architecture Name ${arch_name} in CUDA_SELECT_NVCC_ARCH_FLAGS")
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endif()
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endif()
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if(NOT arch_bin)
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message(SEND_ERROR "arch_bin wasn't set for some reason")
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endif()
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list(APPEND cuda_arch_bin ${arch_bin})
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if(add_ptx)
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if (NOT arch_ptx)
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set(arch_ptx ${arch_bin})
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endif()
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list(APPEND cuda_arch_ptx ${arch_ptx})
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endif()
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endforeach()
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# remove dots and convert to lists
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string(REGEX REPLACE "\\." "" cuda_arch_bin "${cuda_arch_bin}")
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string(REGEX REPLACE "\\." "" cuda_arch_ptx "${cuda_arch_ptx}")
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string(REGEX MATCHALL "[0-9()]+" cuda_arch_bin "${cuda_arch_bin}")
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string(REGEX MATCHALL "[0-9]+" cuda_arch_ptx "${cuda_arch_ptx}")
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if(cuda_arch_bin)
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list(REMOVE_DUPLICATES cuda_arch_bin)
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endif()
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if(cuda_arch_ptx)
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list(REMOVE_DUPLICATES cuda_arch_ptx)
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endif()
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set(nvcc_flags "")
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set(nvcc_archs_readable "")
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# Tell NVCC to add binaries for the specified GPUs
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foreach(arch ${cuda_arch_bin})
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if(arch MATCHES "([0-9]+)\\(([0-9]+)\\)")
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# User explicitly specified PTX for the concrete BIN
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list(APPEND nvcc_flags -gencode arch=compute_${CMAKE_MATCH_2},code=sm_${CMAKE_MATCH_1})
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list(APPEND nvcc_archs_readable sm_${CMAKE_MATCH_1})
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else()
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# User didn't explicitly specify PTX for the concrete BIN, we assume PTX=BIN
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list(APPEND nvcc_flags -gencode arch=compute_${arch},code=sm_${arch})
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list(APPEND nvcc_archs_readable sm_${arch})
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endif()
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endforeach()
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# Tell NVCC to add PTX intermediate code for the specified architectures
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foreach(arch ${cuda_arch_ptx})
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list(APPEND nvcc_flags -gencode arch=compute_${arch},code=compute_${arch})
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list(APPEND nvcc_archs_readable compute_${arch})
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endforeach()
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string(REPLACE ";" " " nvcc_archs_readable "${nvcc_archs_readable}")
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set(${out_variable} ${nvcc_flags} PARENT_SCOPE)
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set(${out_variable}_readable ${nvcc_archs_readable} PARENT_SCOPE)
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endfunction()
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