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http://www.fftw.org/doc/SIMD-alignment-and-fftw_005fmalloc.html
FFTW can be compiled to support the SIMD instructions on any of these systems. A program linking to an FFTW library compiled with SIMD support can obtain a nonnegligible speedup for most complex and r2c/c2r transforms. In order to obtain this speedup, however, ...
http://www.fftw.org/fftw3_doc/Installation-on-Unix.html
The configure script knows good CFLAGS (C compiler flags) for a few systems. If your system is not known, the configure script will print out a warning. In this case, you should re-configure FFTW …
http://www.fftw.org/faq/section2.html
If support for SIMD instructions is enabled in FFTW, further compiler problems may appear: gcc 3.4.[0123] for x86 produces incorrect SSE2 code for FFTW when -O2 (the best choice for FFTW) is used, causing FFTW to crash (make check crashes). This bug is fixed in gcc 3.4.4.
http://www.fftw.org/fftw3_doc/Installation-on-non_002dUnix-systems.html
10.2 Installation on non-Unix systems. It should be relatively straightforward to compile FFTW even on non-Unix systems lacking the niceties of a configure script. Basically, you need to edit the config.h header (copy it from config.h.in) to #define the various options and compiler characteristics, and then compile all the ‘.c’ files in the relevant directories.
https://stackoverflow.com/questions/35517892/build-fftw-lib-with-visual-studio-2015-added-steps-for-vs-2019
If you want threading support, you should add all source files in "threads" except for threads.c. (That one contains the pthreads version.) If you want support for any vector instruction sets, you should include only the files relating to the particular instruction sets you want from the following folders: dft/simd rdft/simd simd-support
https://developer.arm.com/tools-and-software/server-and-hpc/help/porting-and-tuning/building-fftw-with-arm-compiler/procedure
Building FFTW with Arm Compiler - Procedure ... ARM’s developer website includes documentation, tutorials, support resources and more. Over the next few months we will be adding more developer resources and documentation for all the products and technologies that ARM provides. Close. ... enables the set of NEON SIMD instructions. --enable ...
https://github.com/FFTW/fftw3/issues/78
Jan 07, 2017 · Let me know if copying simd-avx.h from 3.3.4 works. I have preemptively reinstated the old 3.3.4 file in our master repository, since I couldn't measure any performance difference between the 3.3.4 and the 3.3.5 versions, and I assume that 3.3.5 breaks PGI but 3.3.4 doesn't.
https://github.com/FFTW/fftw3/blob/master/simd-support/simd-avx512.h
do not check out these files from github unless you know what you are doing. (see below.) - fftw/fftw3
http://manual.gromacs.org/current/install-guide/index.html
FFTW will create a fat library with codelets for all different instruction sets, and pick the fastest supported one at runtime. On ARM architectures with NEON SIMD support and IBM Power8 and later, you definitely want version 3.3.5 or later, and to compile it with --enable-neon and --enable-vsx, respectively, for SIMD support. If you are using ...
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