[cmake] CMake script for choosing CCs #75
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| # | ||
| # CUDA hardware and SDKs are developing over time, different SDK support different | ||
| # hardware, and supported hardware differs depending on platform even for the same | ||
| # SDK version. | ||
| # This file attempts to provide a function that returns a valid selection of hardware | ||
| # for the current SDK and platform. | ||
| # | ||
| # It will require updates as CUDA develops, and it is currently not complete in terms | ||
| # of existing platforms that support CUDA. | ||
| # | ||
| # This function does not edit cache entries or variables in the parent scope | ||
| # except for the variables whose names are supplied for SUPPORTED_CC and | ||
| # SUPPORTED_GENCODE_FLAGS | ||
| # | ||
| # You may want to cache SUPPORTED_CC and append SUPPORTED_GENCODE_FLAGS to | ||
| # CUDA_NVCC_FLAGS. | ||
| # Like this: | ||
| # set(MYCC ${MYCC} CACHE STRING "CUDA CC versions to compile") | ||
| # end | ||
| # set(CUDA_NVCC_FLAGS "${CUDA_NVCC_FLAGS};${MY_GENCODE_FLAGS}") | ||
| # | ||
| # We assume that ${SUPPORTED_CC} can be overwritten. | ||
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| # We assume that ${SUPPORTED_GENCODE_FLAGS} can be overwritten. | ||
| # We assume that MIN_CC default to 20 | ||
| # We assume that MIN_CUDA_VERSION defaults to 7.0 | ||
| # | ||
| function(chooseCudaCC SUPPORTED_CC SUPPORTED_GENCODE_FLAGS) | ||
| set(options "") | ||
| set(oneValueArgs MIN_CUDA_VERSION MIN_CC) | ||
| set(multipleValueArgs "") | ||
| cmake_parse_arguments(CHOOSE_CUDA "${options}" "${oneValueArgs}" "${multipleValueArgs}" ${ARGN}) | ||
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| if(NOT DEFINED CHOOSE_CUDA_MIN_CC) | ||
| set(CHOOSE_CUDA_MIN_CC 20) | ||
| endif() | ||
| if(NOT DEFINED CHOOSE_CUDA_MIN_CUDA_VERSION) | ||
| set(CHOOSE_CUDA_MIN_CUDA_VERSION 7.0) | ||
| endif() | ||
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| find_package(CUDA ${CHOOSE_CUDA_MIN_CUDA_VERSION} REQUIRED) | ||
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| if(NOT CUDA_FOUND) | ||
| message(FATAL_ERROR "Could not find CUDA >= ${CHOOSE_CUDA_MIN_CUDA_VERSION}") | ||
| endif() | ||
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| # | ||
| # Create a list of possible CCs for each host processor. | ||
| # This may require tuning: CUDA cards exist in AIX machines with POWER CPUs, | ||
| # it is possible that non-Tegra ARM systems exist as well. | ||
| # For now, this is my best guess. | ||
| # | ||
| set(TEGRA_SUPPORTED_PROCESSORS "armv71;arm;aarch64") | ||
| set(OTHER_SUPPORTED_PROCESSORS "i686;x86_64;AMD64") | ||
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| set(CC_LIST_BY_SYSTEM_PROCESSOR "") | ||
| if(CMAKE_SYSTEM_PROCESSOR IN_LIST OTHER_SUPPORTED_PROCESSORS) | ||
| list(APPEND CC_LIST_BY_SYSTEM_PROCESSOR "20;21;30;35;50;52;60;61;70;75") | ||
| endif() | ||
| if(CMAKE_SYSTEM_PROCESSOR IN_LIST TEGRA_SUPPORTED_PROCESSORS) | ||
| list(APPEND CC_LIST_BY_SYSTEM_PROCESSOR "32;53;62;72") | ||
| endif() | ||
| if(NOT CC_LIST_BY_SYSTEM_PROCESSOR) | ||
| message(FATAL_ERROR "Unknown how to build for ${CMAKE_SYSTEM_PROCESSOR}") | ||
| endif() | ||
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| # | ||
| # Default setting of the CUDA CC versions to compile. | ||
| # Shortening the lists saves a lot of compile time. | ||
| # | ||
| set(CUDA_MIN_CC 20) | ||
| set(CUDA_MAX_CC 75) | ||
| if(CUDA_VERSION_MAJOR GREATER_EQUAL 10) | ||
| set(CUDA_MIN_CC 30) | ||
| elseif(CUDA_VERSION_MAJOR GREATER_EQUAL 9) | ||
| set(CUDA_MIN_CC 30) | ||
| set(CUDA_MAX_CC 72) | ||
| elseif(CUDA_VERSION_MAJOR GREATER_EQUAL 8) | ||
| set(CUDA_MAX_CC 62) | ||
| elseif(CUDA_VERSION_MAJOR GREATER_EQUAL 7) | ||
| set(CUDA_MAX_CC 53) | ||
| else() | ||
| message(FATAL_ERROR "We do not support a CUDA SDK below version 7.0") | ||
| endif() | ||
| if(${CHOOSE_CUDA_MIN_CC} GREATER ${CUDA_MIN_CC}) | ||
| set(CUDA_MIN_CC ${CHOOSE_CUDA_MIN_CC}) | ||
| endif() | ||
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| set(CC_LIST "") | ||
| foreach(CC ${CC_LIST_BY_SYSTEM_PROCESSOR}) | ||
| if( (${CC} GREATER_EQUAL ${CUDA_MIN_CC}) AND | ||
| (${CC} LESS_EQUAL ${CUDA_MAX_CC}) ) | ||
| list(APPEND CC_LIST ${CC}) | ||
| endif() | ||
| endforeach() | ||
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| # | ||
| # Add all requested CUDA CCs to the command line for offline compilation | ||
| # | ||
| set(GENCODE_FLAGS "") | ||
| list(SORT CC_LIST) | ||
| foreach(CC_VERSION ${CC_LIST}) | ||
| list(APPEND GENCODE_FLAGS "-gencode;arch=compute_${CC_VERSION},code=sm_${CC_VERSION}") | ||
| endforeach() | ||
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| # | ||
| # Use the highest request CUDA CC for CUDA JIT compilation | ||
| # | ||
| list(LENGTH CC_LIST CC_LIST_LEN) | ||
| MATH(EXPR CC_LIST_LEN "${CC_LIST_LEN}-1") | ||
| list(GET CC_LIST ${CC_LIST_LEN} CC_LIST_LAST) | ||
| list(APPEND GENCODE_FLAGS "-gencode;arch=compute_${CC_LIST_LAST},code=compute_${CC_LIST_LAST}") | ||
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| # | ||
| # Two variables are exported to the parent scope. One is passed through the | ||
| # environment (CUDA_NVCC_FLAGS), the other is passed by name (SUPPORTED_CC) | ||
| # | ||
| set(${SUPPORTED_GENCODE_FLAGS} "${GENCODE_FLAGS}" PARENT_SCOPE) | ||
| set(${SUPPORTED_CC} "${CC_LIST}" PARENT_SCOPE) | ||
| endfunction() | ||
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| # | ||
| # This function is used to create a list of gencode instructions for a given list | ||
| # of CCs. | ||
| # It takes as arguments is list of CCs and a list variable that can be filled with | ||
| # gencode strings. | ||
| # | ||
| # We assume that ${SUPPORTED_GENCODE_FLAGS} can be overwritten. | ||
| # | ||
| function(getFlagsForCudaCCList INPUT_CC_LIST SUPPORTED_GENCODE_FLAGS) | ||
| set(CC_LIST "${${INPUT_CC_LIST}}") | ||
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| # | ||
| # Add all requested CUDA CCs to the command line for offline compilation | ||
| # | ||
| set(GENCODE_FLAGS "") | ||
| list(SORT CC_LIST) | ||
| foreach(CC_VERSION ${CC_LIST}) | ||
| list(APPEND GENCODE_FLAGS "-gencode;arch=compute_${CC_VERSION},code=sm_${CC_VERSION}") | ||
| endforeach() | ||
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| # | ||
| # Use the highest request CUDA CC for CUDA JIT compilation | ||
| # | ||
| list(LENGTH CC_LIST CC_LIST_LEN) | ||
| MATH(EXPR CC_LIST_LEN "${CC_LIST_LEN}-1") | ||
| list(GET CC_LIST ${CC_LIST_LEN} CC_LIST_LAST) | ||
| list(APPEND GENCODE_FLAGS "-gencode;arch=compute_${CC_LIST_LAST},code=compute_${CC_LIST_LAST}") | ||
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| message(STATUS "Setting gencode flags: ${GENCODE_FLAGS}") | ||
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| # | ||
| # Two variables are exported to the parent scope. One is passed through the | ||
| # environment (CUDA_NVCC_FLAGS), the other is passed by name (SUPPORTED_CC) | ||
| # | ||
| set(${SUPPORTED_GENCODE_FLAGS} "${GENCODE_FLAGS}" PARENT_SCOPE) | ||
| endfunction() | ||
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