How to enable Neon optimization

[Rajeev Verma]

Hi, 

If I want to compile Relic toolkit with Neon optimization enable for compiler, what would be the possiblechanges?

I am giving neon based flags in the compilation :

 -mcpu=cortex-a15 -mtune=cortex-a15 -mfpu=neon-vfpv4 -mfloat-abi=hard -funroll-loops -fomit-frame-pointer -DCORTEX=15 -marm -finline-small-functions

But it is not giving any change in timing for the results. Is there any specific chage needed in toolkit. 

Please help me out. 

Thanks,

Rajeev

[Diego Aranha]

Dear Rajeev,

Can you please provide the CMake command line you are using? You probably need to turn on GCC auto-vectorization with -ftree-vectorize.

Best,

--
Diego de Freitas Aranha
Institute of Computing - University of Campinas
http://www.ic.unicamp.br/~dfaranha

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[Rajeev Verma]

HI Diego,


Sorry, I was busy with courses last week. This is the command I am using to compile with Neon optimization :

CC=arm-linux-gnueabihf-gcc cmake -DARCH=ARM -DWORD=32 -DSEED=LIBC -DOVERH=OFF -DSHLIB=OFF -DSTBIN=ON -DTIMER=POSIX -DWITH="ALL" -DBENCH=10 -DTESTS=10000 -DCHECK=off -DVERBS=off -DSTRIP=off -DQUIET=off -DCORTEX=15 -DARITH=gmp -DFP_PRIME=256 -DFP_METHD="COMBA;COMBA;MONTY" -DCOMP="-O3 -g -flto -Ofast -mcpu=cortex-a15 -fprefetch-loop-arrays -mfpu=neon -mfloat-abi=hard -funroll-all-loops -mtune=cortex-a15 -ftree-vectorize -fomit-frame-pointer -mvectorize-with-neon-quad -mthumb-interwork -finline-small-functions  -ffast-math -marm -ffunction-sections -fdata-sections -fomit-frame-pointer -finline-small-functions" -DFP_PMERS=ON -DFP_QNRES=on -DPP_METHD="LOWER;O_ATE" ../relic-src-code

But its not giving any effect on timings if I compare with C-only implementation.

I have included arm_neon.h in relic.h and I am using Arndale board with Exynose ARM Cortex-A15 processor.

If you can pointout anything wrong here.



Thanks,
Rajeev