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# Check if the CPU provides fast operations
# for popcount, leftmost and rightmost bit
set(BUILTIN_POPCNT 0)
# Check if we are on a Linux system
if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
# Use /proc/cpuinfo to get the information
file(STRINGS "/proc/cpuinfo" _cpuinfo)
if(_cpuinfo MATCHES "(sse4_2)|(sse4a)")
set(BUILTIN_POPCNT 1)
endif()
elseif(CMAKE_SYSTEM_NAME STREQUAL "Windows")
# handle windows
# get_filename_component(_vendor_id "[HKEY_LOCAL_MACHINE\\Hardware\\Description\\System\\CentralProcessor\\0;VendorIdentifier]" NAME CACHE)
# get_filename_component(_cpu_id "[HKEY_LOCAL_MACHINE\\Hardware\\Description\\System\\CentralProcessor\\0;Identifier]" NAME CACHE)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
# handle MacOs
execute_process(COMMAND sysctl -n machdep.cpu.features
OUTPUT_VARIABLE _cpuinfo OUTPUT_STRIP_TRAILING_WHITESPACE)
if(_cpuinfo MATCHES "SSE4.2")
set(BUILTIN_POPCNT 1)
endif()
endif()
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