Filip LeonarskiandClaude Opus 5.5
3c7efcd1e5
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FFTW's CMake build knows only SSE/SSE2/AVX/AVX2; NEON exists only in its autotools build (--enable-neon). The ENABLE_NEON this file set was silently ignored, so on Apple Silicon and the Linux aarch64 build FFTW ran its scalar codelets (config.h: HAVE_NEON undefined, no simd/neon objects). The NEON sources are now added to fftw3f the way its CMakeLists adds the SSE2/AVX ones, with HAVE_NEON as a target definition (the config.h template carries it only as a comment). No compiler flag: NEON is part of every aarch64 CPU. FFTW 3.3.11 would not help - its CMake build has no NEON either, and its Apple ARM cycle counter only matters to FFTW_MEASURE planning, while every plan here is FFTW_ESTIMATE. FFTW's runtime NEON probe on unix/linux executes .long 0xf2000150; on aarch64 that decodes as ands x16, x10, #0x100000001 and runs without SIGILL (checked on Apple Silicon), so the codelets are used on Linux too. Measured on Apple Silicon against the scalar build: batched 1D r2c 1.8x (power-of-two length) and 1.3x (730), 2D r2c 1024^2 1.9x, 3D c2r 128^3 2.6x, spectra equal to 1.6e-8 relative. rugnux -X FFTW on 360 frames of the rotation test set: merged .hkl byte-identical, report identical; CPU time unchanged (300 s), so FFTs are a small share of that run. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Jungfraujoch
Application to receive data from the PSI JUNGFRAU and EIGER detectors.
All documentation is now placed in docs/ subdirectory and for the current version hosted on Jungfraujoch Read The Docs page.