I was able to get the compiler flags passed in so that the check for the
header arm_neon.h passes. I added it to the CMakeList root file with
SET(CMAKE_CXX_FLAGS, "${CMAKE_CXX_FLAGS} -mfloat-abi=softfp -mfpu=neon").Then, it would detect neon. However, I spent considerable time cleaning up whatever package problems I had since I ended up with a bunch of weird errors. Once I straightened my packages up (Debian), it is compiling with neon! And, hopefully, it will actually use the ARM neon routines. On Thu, Nov 9, 2017 at 3:22 AM, Kevin McGuire <kmcg3...@gmail.com> wrote: > I have noticed that neon support for the converter is not enabling. The > CMakeError.log has this output. I am not certain as I am not really > familiar with ARM and NEON, but I checked my CPU and it does support it. > Also, the error message below is saying it is just a matter of passing > certain flags. > > /mnt/extra/usr/lib/gcc/arm-linux-gnueabihf/4.8/include/arm_neon.h:32:2: > error: #error You must enable NEON instructions (e.g. -mfloat-abi=softfp > -mfpu=neon) to use arm_neon.h > #error You must enable NEON instructions (e.g. -mfloat-abi=softfp > -mfpu=neon) to use arm_neon.h > > Normally, I would just fix it myself and move forward, but me and CMake > mix like oil and water. It is kind of embarrassing but I swear it never > does what I want it do - such as adding a darn flag. I even tried to force > the options, lol, and all be danged if CMake finds some way to error. > > Will work on this tomorrow, but if anyone has a solution I am all ears. If > not then no problem and I will reply when I figure it out. > > This came about when I noticed what really seemed like abnormally high CPU > usage on my ARM code for a simple shuffling of data out of the network > packets. I traced what I felt like was the biggest possible hot spot to the > converter routine. Anyway, that is my plan right now, to see if NEON might > help if the converter is having to swap byte order. >
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