System information (version)
- OpenCV => master ( b21b694 )
- Operating System / Platform => Linux ARM32bit / Linux ARM64bit
- Compiler => GCC 4.8.4, 5.4.0
Detailed description
- CPU dispatch option is introduced, but it keeps blocking to activate the NEON on ARM platform
- The main problem comes from obsolete options
ENABLE_NEON here
OCV_OPTION(ENABLE_NEON "Enable NEON instructions" "${NEON}" IF CMAKE_COMPILER_IS_GNUCXX AND (ARM OR AARCH64 OR IOS) )
OCV_OPTION(ENABLE_VFPV3 "Enable VFPv3-D32 instructions" OFF IF CMAKE_COMPILER_IS_GNUCXX AND (ARM OR AARCH64 OR IOS) )ocv_optimization_process_obsolete_option(ENABLE_VFPV3 VFPV3 OFF)
ocv_optimization_process_obsolete_option(ENABLE_NEON NEON OFF)
- This macro
ocv_optimization_process_obsolete_option will check the obsolete option and pass it to the "new" dispatch option, but I think there is a bug in this macro which ends up always switching flags to OFF
if(${legacy_flag}) # !!!! this will not be evaluated as ON/OFF !!!!
if(NOT ";${CPU_BASELINE_REQUIRE};" MATCHES ";${OPT};")
set(CPU_BASELINE_REQUIRE "${CPU_BASELINE_REQUIRE};${OPT}" CACHE STRING "${HELP_CPU_BASELINE_REQUIRE}" FORCE)
endif()
else()
if(NOT ";${CPU_BASELINE_DISABLE};" MATCHES ";${OPT};")
set(CPU_BASELINE_DISABLE "${CPU_BASELINE_DISABLE};${OPT}" CACHE STRING "${HELP_CPU_BASELINE_DISABLE}" FORCE)
endif()
endif()
- as a conclusion, the
NEON flag and FP16 flags always become false because those flag always go to CPU_BASELINE_DISABLE option.
- I'll push a fix for this issue.
Steps to reproduce
- on ARM 32bit (Jetson TK1)
cmake -DCPU_BASELINE=NEON ..
- on ARM 64bit (Jetson TX1)
System information (version)
Detailed description
ENABLE_NEONhereocv_optimization_process_obsolete_optionwill check the obsolete option and pass it to the "new" dispatch option, but I think there is a bug in this macro which ends up always switching flags to OFFNEONflag andFP16flags always become false because those flag always go toCPU_BASELINE_DISABLEoption.Steps to reproduce