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https://github.com/ceph/ceph
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d72c9205dc
if nasm is able to emit AVX512 instructions, we can assume that it's able to generate AVX2 instructions as well. so no need to print "Found nasm" multiple times. and by chaining mutual exclusive branches with "elseif", we can have better readability. Signed-off-by: Kefu Chai <kchai@redhat.com>
55 lines
1.9 KiB
CMake
55 lines
1.9 KiB
CMake
macro(check_nasm_support _object_format _support_x64 _support_x64_and_avx2 _support_x64_and_avx512)
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execute_process(
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COMMAND which nasm
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RESULT_VARIABLE no_nasm
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OUTPUT_QUIET
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ERROR_QUIET)
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if(NOT no_nasm)
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if(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64")
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set(save_quiet ${CMAKE_REQUIRED_QUIET})
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set(CMAKE_REQUIRED_QUIET true)
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include(CheckCXXSourceCompiles)
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check_cxx_source_compiles("
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#if defined(__x86_64__) && defined(__ILP32__)
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#error x32
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#endif
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int main() {}
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" ${_support_x64})
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set(CMAKE_REQUIRED_QUIET ${save_quiet})
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if(${_support_x64})
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execute_process(COMMAND nasm -f ${object_format} -i
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${CMAKE_SOURCE_DIR}/src/isa-l/include/
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${CMAKE_SOURCE_DIR}/src/isa-l/erasure_code/gf_vect_dot_prod_avx2.asm
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-o /dev/null
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RESULT_VARIABLE rc
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OUTPUT_QUIET
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ERROR_QUIET)
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if(NOT rc)
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set(${_support_x64_and_avx2} TRUE)
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endif()
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execute_process(COMMAND nasm -D HAVE_AS_KNOWS_AVX512 -f ${object_format}
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-i ${CMAKE_SOURCE_DIR}/src/isa-l/include/
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${CMAKE_SOURCE_DIR}/src/isa-l/erasure_code/gf_vect_dot_prod_avx512.asm
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-o /dev/null
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RESULT_VARIABLE rt
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OUTPUT_QUIET
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ERROR_QUIET)
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if(NOT rt)
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set(${_support_x64_and_avx512} TRUE)
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endif()
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endif(${_support_x64})
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endif(CMAKE_SYSTEM_PROCESSOR MATCHES "amd64|x86_64")
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endif(NOT no_nasm)
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if(no_nasm)
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message(STATUS "Could NOT find nasm")
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elseif(NOT ${_support_x64})
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message(STATUS "Found nasm: but x86_64 with x32 ABI is not supported")
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elseif(${_support_x64_and_avx512})
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message(STATUS "Found nasm: best -- capable of assembling AVX512")
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elseif(${_support_x64_and_avx2})
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message(STATUS "Found nasm: better -- capable of assembling AVX2")
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elseif(${_support_x64})
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message(STATUS "Found nasm: good -- capable of assembling x86_64")
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endif()
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endmacro()
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