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[CMake] Allow building for Blackwell+ GPUs #5524

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[CMake] Allow building for Blackwell+ GPUs #5524

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42 changes: 42 additions & 0 deletions Tools/CMake/AMReXUtils.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -266,6 +266,48 @@ endfunction ()
function (set_cuda_architectures _cuda_archs)

set(_archs ${${_cuda_archs}})
set(_cmake_archs)
set(_all_numeric TRUE)
set(_has_numeric_sm10_or_newer FALSE)

foreach (_item IN LISTS _archs)
set(_arch_no_suffix "${_item}")
set(_arch_suffix "")
if (_arch_no_suffix MATCHES "-real$")
string(REGEX REPLACE "-real$" "" _arch_no_suffix "${_arch_no_suffix}")
set(_arch_suffix "-real")
elseif (_arch_no_suffix MATCHES "-virtual$")
string(REGEX REPLACE "-virtual$" "" _arch_no_suffix "${_arch_no_suffix}")
set(_arch_suffix "-virtual")
endif ()

if (_arch_no_suffix MATCHES "^([0-9]+)\\.([0-9]+)$")
set(_arch_major "${CMAKE_MATCH_1}")
set(_arch_minor "${CMAKE_MATCH_2}")
list(APPEND _cmake_archs "${_arch_major}${_arch_minor}${_arch_suffix}")
if (_arch_major GREATER_EQUAL 10)
set(_has_numeric_sm10_or_newer TRUE)
endif ()
elseif (_arch_no_suffix MATCHES "^[0-9]+$")
list(APPEND _cmake_archs "${_arch_no_suffix}${_arch_suffix}")
if (_arch_no_suffix GREATER_EQUAL 100)
math(EXPR _arch_major "${_arch_no_suffix}/10" OUTPUT_FORMAT DECIMAL)
if (_arch_major GREATER_EQUAL 10)
set(_has_numeric_sm10_or_newer TRUE)
endif ()
endif ()
else ()
set(_all_numeric FALSE)
endif ()
endforeach ()

# The legacy cuda_select_nvcc_arch_flags helper does not understand SM 10+.
# For modern CMake target properties, explicit numeric archs can be used directly.
if (_all_numeric AND _has_numeric_sm10_or_newer)
set(AMREX_CUDA_ARCHS ${_cmake_archs} CACHE INTERNAL "CUDA archs AMReX is built for")
return()
endif ()

convert_cuda_archs(_archs)

include(FindCUDA/select_compute_arch)
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