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Revision 1.2 / (download) - annotate - [select for diffs], Tue Apr 29 22:48:45 2003 UTC (20 years, 11 months ago) by jtb
Branch: MAIN
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Changes since 1.1: +9 -2
lines
Diff to previous 1.1 (colored)
Update to version 3.0. Major goals of this release: * Speed: often 20% or more faster than FFTW 2.x, even without SIMD (see below). * Complete rewrite, to make it easier to add new algorithms and transforms. * New API, to support more general semantics. Other enhancements: * SIMD acceleration on supporting CPUs (SSE, SSE2, 3DNow!, and AltiVec). (With special thanks to Franz Franchetti for many experimental prototypes and to Stefan Kral for the vectorizing generator from fftwgel.) * True in-place 1d transforms of large sizes (as well as compressed twiddle tables for additional memory/cache savings). * More arbitrary placement of real & imaginary data, e.g. including interleaved (as in FFTW 2.x) as well as separate real/imag arrays. * Efficient prime-size transforms of real data. * Multidimensional transforms can operate on a subset of a larger matrix, and/or transform selected dimensions of a multidimensional array. * By popular demand, simultaneous linking to double precision (fftw), single precision (fftwf), and long-double precision (fftwl) versions of FFTW is now supported. * Cycle counters (on all modern CPUs) are exploited to speed planning. * Efficient transforms of real even/odd arrays, a.k.a. discrete cosine/sine transforms (types I-IV). (Currently work via pre/post processing of real transforms, ala FFTPACK, so are not optimal.) * DHTs (Discrete Hartley Transforms), again via post-processing of real transforms (and thus suboptimal, for now). * Support for linking to just those parts of FFTW that you need, greatly reducing the size of statically linked programs when only a limited set of transform sizes/types are required. * Canonical global wisdom file (/etc/fftw/wisdom) on Unix, along with a command-line tool (fftw-wisdom) to generate/update it. * Fortran API can be used with both g77 and non-g77 compilers simultaneously. * Multi-threaded version has optional OpenMP support. * Authors' good looks have greatly improved with age.