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# Check if the processor is an ARM and if Neon instruction are available on the machine where
# the project is compiled.
IF(CMAKE_SYSTEM_NAME MATCHES "Linux")
EXEC_PROGRAM(cat ARGS "/proc/cpuinfo" OUTPUT_VARIABLE CPUINFO)
#neon instruction can be found on the majority part of modern ARM processor
STRING(REGEX REPLACE "^.*(neon).*$" "\\1" NEON_THERE ${CPUINFO})
STRING(COMPARE EQUAL "neon" "${NEON_THERE}" NEON_TRUE)
IF (NEON_TRUE)
set(NEON_FOUND true CACHE BOOL "NEON available on host")
ELSE (NEON_TRUE)
set(NEON_FOUND false CACHE BOOL "NEON available on host")
ENDIF (NEON_TRUE)
# on ARMv8, neon is inherit and instead listed as 'asimd' in /proc/cpuinfo
STRING(REGEX REPLACE "^.*(asimd).*$" "\\1" ASIMD_THERE ${CPUINFO})
STRING(COMPARE EQUAL "asimd" "${ASIMD_THERE}" ASIMD_TRUE)
IF (ASIMD_TRUE)
set(ASIMD_FOUND true CACHE BOOL "ASIMD/NEON available on host")
ELSE (ASIMD_TRUE)
set(ASIMD_FOUND false CACHE BOOL "ASIMD/NEON available on host")
ENDIF (ASIMD_TRUE)
#Find the processor type (for now OMAP3 or OMAP4)
STRING(REGEX REPLACE "^.*(OMAP3).*$" "\\1" OMAP3_THERE ${CPUINFO})
STRING(COMPARE EQUAL "OMAP3" "${OMAP3_THERE}" OMAP3_TRUE)
IF (OMAP3_TRUE)
set(CORTEXA8_FOUND true CACHE BOOL "OMAP3 available on host")
ELSE (OMAP3_TRUE)
set(CORTEXA8_FOUND false CACHE BOOL "OMAP3 available on host")
ENDIF (OMAP3_TRUE)
#Find the processor type (for now OMAP3 or OMAP4)
STRING(REGEX REPLACE "^.*(OMAP4).*$" "\\1" OMAP4_THERE ${CPUINFO})
STRING(COMPARE EQUAL "OMAP4" "${OMAP4_THERE}" OMAP4_TRUE)
IF (OMAP4_TRUE)
set(CORTEXA9_FOUND true CACHE BOOL "OMAP4 available on host")
ELSE (OMAP4_TRUE)
set(CORTEXA9_FOUND false CACHE BOOL "OMAP4 available on host")
ENDIF (OMAP4_TRUE)
ELSEIF(CMAKE_SYSTEM_NAME MATCHES "Darwin")
IF(CMAKE_SYSTEM_PROCESSOR STREQUAL "arm64" AND NOT CMAKE_OSX_ARCHITECTURES STREQUAL "x86_64")
set(NEON_FOUND true CACHE BOOL "NEON available on ARM64")
ENDIF()
EXEC_PROGRAM("/usr/sbin/sysctl -n machdep.cpu.features" OUTPUT_VARIABLE
CPUINFO)
IF(NOT CPUINFO STREQUAL "")
#neon instruction can be found on the majority part of modern ARM processor
STRING(REGEX REPLACE "^.*(neon).*$" "\\1" NEON_THERE ${CPUINFO})
STRING(COMPARE EQUAL "neon" "${NEON_THERE}" NEON_TRUE)
IF (NEON_TRUE)
set(NEON_FOUND true CACHE BOOL "NEON available on host")
ELSE (NEON_TRUE)
set(NEON_FOUND false CACHE BOOL "NEON available on host")
ENDIF (NEON_TRUE)
ENDIF()
ELSEIF(CMAKE_SYSTEM_NAME MATCHES "Windows")
# TODO
set(CORTEXA8_FOUND false CACHE BOOL "OMAP3 not available on host")
set(CORTEXA9_FOUND false CACHE BOOL "OMAP4 not available on host")
set(NEON_FOUND false CACHE BOOL "NEON not available on host")
ELSE(CMAKE_SYSTEM_NAME MATCHES "Linux")
set(CORTEXA8_FOUND false CACHE BOOL "OMAP3 not available on host")
set(CORTEXA9_FOUND false CACHE BOOL "OMAP4 not available on host")
set(NEON_FOUND false CACHE BOOL "NEON not available on host")
ENDIF(CMAKE_SYSTEM_NAME MATCHES "Linux")
if(NOT NEON_FOUND)
MESSAGE(STATUS "Could not find hardware support for NEON on this machine.")
endif(NOT NEON_FOUND)
if(NOT CORTEXA8_FOUND)
MESSAGE(STATUS "No OMAP3 processor on this machine.")
endif(NOT CORTEXA8_FOUND)
if(NOT CORTEXA9_FOUND)
MESSAGE(STATUS "No OMAP4 processor on this machine.")
endif(NOT CORTEXA9_FOUND)
mark_as_advanced(NEON_FOUND)
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