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SVE Imlementation #355

Open Juliya32 opened 6 months ago

Juliya32 commented 6 months ago

Hi 1)Is sve already implemented in fftw-3.3.10 i) If yes, is it implemented for all routines? ii) If not , How can one implement for the remaining routines ( Where to make the changes in the code and any other targeted file sve. I have checked this (https://github.com/rdolbeau/fftw3/tree/arm-sve) and found only one program that uses sve_width() (calculates width of sve vector) in simd-support/sve.h file. 2) If sve is not applied at all could you please guide me in applying sve to fftw library. I tried changing the given part of code under kernel/planner.c usning intrinsics on arm. for (i = 0; i < osiz; ++i) ntab[i] = otab[i]; After making the changing i tried rebuilding the library, but it throws error that arm_sve is not supported. (It cannot recognize any sve data types or routines like sv_bool, sv_float32, svld1 etc. )

I built the library using the following commands: 1)./configure --prefix=/home/../FFTW_SVE/fftw-3.3.10/build/ --enable-sve --enable-neon --enable-fma --enable-armv8-cntvct-e10 --enable-threads --enable-shared --enable-single CC=gcc CFLAGS="-O3 -gdwarf-4 -mtune=native -march=armv8.2-a+sve -msve-vector-bits=512" CXXFLAGS="-Ofast -march=armv8.2-a+sve -sve-vector-bits=512" FC=gfortran FFLAGS="-g -O3 -march=armv8.2-a+sve -msve-vector-bits=512" 2)make 3)make install gcc --version 12.2.0

rdolbeau commented 4 months ago

see #315, yes it can be exploited in all plans (but will only be used if useful vs. scalar and NEON if using >= measure)