fujitsu / fftw3

This is a fork of the FFTW3 for the Armv8-A 64-bit architecture (AArch64) with 512-bit Scalable Vector Extension (SVE) support.

FFTW3

This is a fork of the FFTW3 for the Armv8-A 64-bit architecture (AArch64) with 512-bit Scalable Vector Extension (SVE) support.

See the FFTW home page for more information.

Prerequisites

• Fujitsu Fortran Compiler and Fujitsu C/C++ Compiler
• GNU automake 1.16.1 or higher
• GNU Autoconf 2.69 or higher
• GNU libtool 2.4.6 or higher
• GNU Texinfo 6.7 or higher

Installation

Download the source code

• Clone this repository.

$ git clone https://github.com/fujitsu/fftw3.git

Generate configure scripts

• Run autoreconf.

$ cd fftw3
$ touch ChangeLog
$ autoreconf --verbose --install --symlink --force

Building FFTW3

Notice

• To create a library for fortran, specify --enable-linkfortran at configure, if the compiler option -Nclang is specified in the environment variable for compile command or in the compilation profile file.

Single precision

• Native compilation using Fujitsu compiler (AArch64 target).

$ ./configure                                   \
    CC="fcc"                                    \
    F77="frt"                                   \
    CFLAGS='-Nclang -Ofast -ffj-no-fast-matmul' \
    FFLAGS='-Kfast'                             \
    --enable-sve                                \
    --enable-armv8-cntvct-el0                   \
    --enable-float                              \
    --enable-fma                                \
    --enable-fortran                            \
    --enable-openmp                             \
    --enable-shared                             \
    --prefix="$INSTALL_PATH"                    \
    --libdir="$INSTALL_PATH/lib64"              \
    ac_cv_prog_f77_v='-###'                     \
    OPENMP_CFLAGS='-Kopenmp'
$ make -j30

• Cross compilation using Fujitsu compiler (AArch64 target).

$ ./configure                                   \
    CC="fccpx"                                  \
    F77="frtpx"                                 \
    CFLAGS='-Nclang -Ofast -ffj-no-fast-matmul' \
    FFLAGS='-Kfast'                             \
    --host=aarch64-unknown-linux-gnu            \
    --build=x86_64-cross-linux-gnu              \
    --enable-sve                                \
    --enable-armv8-cntvct-el0                   \
    --enable-float                              \
    --enable-fma                                \
    --enable-fortran                            \
    --enable-openmp                             \
    --enable-shared                             \
    --prefix="$INSTALL_PATH"                    \
    --libdir="$INSTALL_PATH/lib64"              \
    ac_cv_prog_f77_v='-###'                     \
    OPENMP_CFLAGS='-Kopenmp'
$ make -j30

Double precision

• Native compilation using Fujitsu compiler (AArch64 target).

$ ./configure                                   \
    CC="fcc"                                    \
    F77="frt"                                   \
    CFLAGS='-Nclang -Ofast -ffj-no-fast-matmul' \
    FFLAGS='-Kfast'                             \
    --enable-sve                                \
    --enable-armv8-cntvct-el0                   \
    --enable-fma                                \
    --enable-fortran                            \
    --enable-openmp                             \
    --enable-shared                             \
    --prefix="$INSTALL_PATH"                    \
    --libdir="$INSTALL_PATH/lib64"              \
    ac_cv_prog_f77_v='-###'                     \
    OPENMP_CFLAGS='-Kopenmp'
$ make -j30

• Cross compilation using Fujitsu compiler (AArch64 target).

$ ./configure                                   \
    CC="fccpx"                                  \
    F77="frtpx"                                 \
    CFLAGS='-Nclang -Ofast -ffj-no-fast-matmul' \
    FFLAGS='-Kfast'                             \
    --host=aarch64-unknown-linux-gnu            \
    --build=x86_64-cross-linux-gnu              \
    --enable-sve                                \
    --enable-armv8-cntvct-el0                   \
    --enable-fma                                \
    --enable-fortran                            \
    --enable-openmp                             \
    --enable-shared                             \
    --prefix="$INSTALL_PATH"                    \
    --libdir="$INSTALL_PATH/lib64"              \
    ac_cv_prog_f77_v='-###'                     \
    OPENMP_CFLAGS='-Kopenmp'
$ make -j30

Run tests

$ make check

Install FFTW3

$ make install

Usage

How to compile

• Compile with the -L$(INSTALL_PATH)/lib64 option and one of the options listed in the following table after your sources or objects.

FFTW3 libraries	Options
Single precision and sequential version	-lfftw3f -lm
Single precision and thread-parallel version	-lfftw3f_omp -lfftw3f -lm
Double precision and sequential version	-lfftw3 -lm
Double precision and thread-parallel version	-lfftw3_omp -lfftw3 -lm

• If you specified --enable-linkfortran at configure, compile with one of the following options.

FFTW3 libraries	Options
Single precision and sequential version	-lfftw3f_fortran -lm
Single precision and thread-parallel version	-lfftw3f_fortran_omp -lfftw3f_fortran -lm
Double precision and sequential version	-lfftw3_fortran -lm
Double precision and thread-parallel version	-lfftw3_fortran_omp -lfftw3_fortran -lm

Example

• Case with the single precision and sequential library.

$ fcc a.c -L$(INSTALL_PATH)/lib64 -lfftw3f -lm

• If --enable-linkfortran is specified at configure, case with the single precision and sequential library.

$ frt a.f -L$(INSTALL_PATH)/lib64 -lfftw3f_fortran -lm

License

• See LICENSE file.

fftw3's Issues

Bench test fails in single precision library

The implementation of the single precision version of the SVE route is strange.
This only happens on the sve-dev branch.

fftw3/tests/bench --verify  //obrd16632
...
Found relative error 5.166780e+36 (impulse)
       0 4918227518190379286992519168.000000000000   0.000000000000    64.482559204102   0.000000000000
       1  54.550598144531   0.000000000000    64.482559204102   0.000000000000
       2 13827268917597039853830144.000000000000   0.000000000000    64.482559204102   0.000000000000
       3 120.677856445312   0.000000000000    64.482559204102   0.000000000000
       4  -0.470948427916   0.000000000000    64.482559204102   0.000000000000
       5  64.457267761230   0.000000000000    64.482559204102   0.000000000000
       6 72479053655475519631778190983168.000000000000   0.000000000000    64.482559204102   0.000000000000
       7   2.092102050781   0.000000000000    64.482559204102   0.000000000000
       8 93293.312500000000   0.000000000000    64.482559204102   0.000000000000
       9  85.172790527344   0.000000000000    64.482559204102   0.000000000000
      10 2156181075246777892864.000000000000   0.000000000000    64.482559204102   0.000000000000
      11 133.840789794922   0.000000000000    64.482559204102   0.000000000000
      12 3341701475928780113444864.000000000000   0.000000000000    64.482559204102   0.000000000000
      13 105.257469177246   0.000000000000    64.482559204102   0.000000000000
....     

error: " *** No rule to make target 'rfftwnd.pdf', needed by 'fftw3.info'. Stop."

When "make -j 30" is executed according to the procedure of "Native compilation using Fujitsu compiler (AArch64 target).", the following error occurs.

"...
make[2]: Entering directory '/home/fx700user/komura/fftw_test/fftw3/mpi'
sed 's/C_MPI_FINT//' ./fftw3-mpi.f03.in > fftw3-mpi.f03
sed 's/C_MPI_FINT//' ./fftw3l-mpi.f03.in > fftw3l-mpi.f03
make all-am
make[3]: Entering directory '/home/fx700user/komura/fftw_test/fftw3/mpi'
make[3]: Nothing to be done for 'all-am'.
make[3]: Leaving directory '/home/fx700user/komura/fftw_test/fftw3/mpi'
make[2]: Leaving directory '/home/fx700user/komura/fftw_test/fftw3/mpi'
Making all in doc
make[2]: Entering directory '/home/fx700user/komura/fftw_test/fftw3/doc'
Making all in FAQ
make[3]: Entering directory '/home/fx700user/komura/fftw_test/fftw3/doc/FAQ'
make[3]: Nothing to be done for 'all'.
make[3]: Leaving directory '/home/fx700user/komura/fftw_test/fftw3/doc/FAQ'
make[3]: Entering directory '/home/fx700user/komura/fftw_test/fftw3/doc'
make[3]: *** No rule to make target 'rfftwnd.pdf', needed by 'fftw3.info'. Stop.
make[3]: Leaving directory '/home/fx700user/komura/fftw_test/fftw3/doc'
make[2]: *** [Makefile:633: all-recursive] Error 1
make[2]: Leaving directory '/home/fx700user/komura/fftw_test/fftw3/doc'
make[1]: *** [Makefile:729: all-recursive] Error 1
make[1]: Leaving directory '/home/fx700user/komura/fftw_test/fftw3'
make: *** [Makefile:573: all] Error 2"

Could you tell me how to deal with it?
Thank you in advance.