Subversion Repositories shark

Version 2.1.2

  * Fixed incompatibility between our MPI test programs and MPICH with

    the p4 device (TCP/IP).  (The 2.1.1 transforms worked, but the test

    programs crashed.)

  * Added missing fftw_f77_threads_init function to the Fortran wrappers

    for the multi-threaded transforms.  Thanks to V. Sundararajan for

    the bug report.

  * The codelet generator can now output efficient hard-coded DCT/DST

    transforms.  As a side effect of this work, we slightly reduced the

    code size of rfftw.

  * Test programs now support GNU-style long options when used with glibc.

  * Added some more ideas to our TODO list.

  * Improved codelet generator speed.

Version 2.1.1

  * Fixed bug in the complex transforms for certain sizes with

    intermediate-length prime factors (17-97), which under some

    (hopefully rare) circumstances could cause incorrect results.

    Thanks to Ming-Chang Liu for the bug report and patch.  (The test

    program will now catch this sort of problem when it is run in

    paranoid mode.)

Version 2.1

  * Added Fortran-callable wrapper routines for the multi-threaded

    transforms.

  * Documentation fixes and improvements.

Version 2.1-beta1

  * The --enable-type-prefix option to configure makes it easy to install

    both single- and double-precision versions of FFTW on the same

    (Unix) system.  (See the installation section of the manual.)

  * The MPI FFTW routines now include parallel one-dimensional transforms

    for complex data.  (See the fftw_mpi documentation in the FFTW

    manual.)

  * The MPI FFTW routines now include parallel multi-dimensional transforms

    specialized for real data.  (See the rfftwnd_mpi documentation in the

    FFTW manual.)

  * The MPI FFTW routines are now documented in the main

    manual (in the doc directory).  On Unix systems, they are also

    automatically configured, compiled, and installed along with the main

    FFTW library when you include --enable-mpi in the flags to the

    configure script.  (See the FFTW manual.)

  * Largely-rewritten MPI code.  It is now cleaner and (sometimes) faster.

    It also supports the option of a user-supplied workspace for (often)

    greater performance (using the MPI_Alltoall primitive).  Beware that

    the interfaces have changed slightly, however.

  * The multi-threaded FFTW routines now include parallel one- and

    multi-dimensional transforms of real data.  (See the rfftw_threads

    documentation in the FFTW manual.)

  * The multi-threaded FFTW routines are now documented in the main

    manual (in the doc directory).  On Unix systems, they are also

    automatically configured, compiled, and installed along with the main

    FFTW library when you include --enable-threads in the flags to the

    configure script.  (See the FFTW manual.)

  * The multi-threaded FFTW routines now include support for Mach C

    threads (used, for example, in Apple's MacOS X).

  * The Fortran-callable wrapper routines are now incorporated into

    the ordinary FFTW libraries by default (although you can

    disable this with the --disable-fortran option to configure) and

    are documented in the main FFTW manual.

  * Added an illustration of the data layout to the rfftwnd tutorial

    section of the manual, in the hope of preventing future confusion

    on this subject.

  * The test programs now allow you to specify multidimensional sizes

    (e.g. 128x54x81) for the -c and -s correctness and speed test options.

Version 2.0.1

  * (bug fix) Due to a poorly-parenthesized expression, rfftwnd overflowed

    32-bit integer precision for rank > 1 transforms with a final

    dimension >= 65536.  This is now fixed.  (Thanks to Walter Brisken

    for the bug report.)

  * (bug fix) Added definition of FFTW_OUT_OF_PLACE to fftw.h.  The

    flag is mentioned several times in the documentation, but its

    definition was accidentally omitted since FFTW_OUT_OF_PLACE is the

    default behavior.

  * Corrected various small errors in the documentation.  Thanks to

    Geir Thomassen and Jeremy Buhler for their comments.

  * Improved speed of the codelet generator by orders of magnitude,

    since a user needed a hard-coded fft of size 101.

  * Modified buffering in multidimensional transforms for some speed

    improvements (only when fftwnd_create_plan_specific is used).

    Thanks to Geert van Kempen for his tips.

  * Added Andrew Sterian's patch to allow FFTW to be used as a shared

    library more easily on Win32.

Version 2.0

  * Completely rewritten real-complex transforms, now using

    specialized codelets and an inherently real-complex algorithm for

    greatly increased speed.  Also, rfftw can now handle odd sizes and

    strided transforms.  Beware that the output format for 1D rfftw

    transforms has changed.  See the manual for more details.

  * The complex transforms now use a fast algorithm for large prime

    factors, working in O(N lg N) time even for prime sizes.

    (Previously, the complexity contained an O(p^2) term, where p is

    the largest prime factor of N.  This is still the case for the

    rfftw transforms.)  Small prime factors are still more efficient,

    however.

  * Added functions fftw_one, fftwnd_one, rfftw_one, etcetera, to

    simplify and clarify the use of fftw for single, unit-stride

    transforms.

  * Renamed FFTW_COMPLEX, FFTW_REAL to fftw_complex, fftw_real (for

    greater consistency in capitalization).  The all-caps names will

    continue to be supported indefinitely, but are deprecated.  (Also,

    support for the COMPLEX and REAL types from FFTW 1.0 is now

    disabled by default.)

  * There are now Fortran-callable wrappers for the rfftw real-complex

    transforms.

  * New section of the manual discussing the use of FFTW with multiple

    threads, and a new FFTW_THREADSAFE flag (described therein).

  * Added shared library support.  Use configure --enable-shared to

    produce a shared library instead of a static library (the default).

  * Dropped support for the operation-count (*_op_count) routines

    introduced in v1.3, as these were little-used and were a pain to

    keep up-to-date as FFTW changed internally.

  * Made it easier to support floating-point types other than float

    and double (e.g. long double).  (See the file fftw-int.h.)

Version 1.3

  * Multi-dimensional transforms contain significant performance

    improvements for dimensions >= 3.

  * Performance improvements in multi-dimensional transforms

    with howmany > 1 and stride > dist.

  * Improved parallelization and performance in the threads

    code for dimensions >= 3.

  * Changed the wisdom import/export format (the new wisdom remembers

    the stride of the plan that generated it, for use with the new

    create_plan_specific functions).  (You should regenerate any stored

    wisdom you have anyway, since this is a new version of FFTW.)

  * Several small fixes to aid compilation on some systems.

Version 1.3b1

  * Fixed a bug in the MPI transform (in the transpose routine) that

    caused errors for some array sizes.

  * Fixed the (hopefully) last few things causing problems with C++

    compilers.

  * Hack for x86/gcc to properly align local double-precision variables.

  * Completely rewritten codelet generator.  Now it produces

    better code for non powers of 2, and is ready to produce

    real->complex transforms.

  * Testing algorithm is now more robust, and has a more rigorous

    theoretical foundation.  (Bugs in testing large transforms or

    in single precision are now fixed--these bugs were only in the

    test programs and not in the FFTW library itself.)

  * Added "specific" planners, which allow plan optimization for a

    specific array/stride.  They also reduce the memory requirements

    of the planner, and permit new optimizations in the multi-dimensional

    case.  (See the *_create_plan_specific functions.)

  * FFTW can now compute a count of the number of arithmetic operations

    it requires, which is useful for some academic purposes.  (See the

    *_count_plan_ops functions.)

  * Adapted for use with GNU autoconf to aid installation on UNIX systems.

    (Installation on non-UNIX systems should be the same as before.)

  * Used gettimeofday function if available.  (This function typically

    has much higher accuracy than clock(), permitting plans to be

    created much more quickly than before on many machines.)

  * Made timing algorithm (hopefully) more robust in the face of

    system interrupts, etc.

  * Added wrapper routines for calling FFTW from MATLAB (in the

    matlab/ directory).

  * Added wrapper routines for calling FFTW from Fortran (in the

    fortran/ directory).  (These were available separately before.)

Version 1.2.1

  * Fixed a third bug in the mpi transpose routines (sheesh!) that

    could cause problems when re-using a transpose plan.  Thanks

    to Eric Skyllingstad for the bug reports.

  * Fixed another bug in the mpi transpose routines. This bug produced

    a memory leak and also occasionally tries to free a null pointer,

    which causes problems on some systems.  The mpi transpose/fft routines

    now pass all of our malloc paranoia tests.

  * Fixed bug in mpi transpose routines, where wrong results

    could be given for some large 2D arrays.

Version 1.2:

  * Added a FAQ (in the FAQ/ directory).

  * Fixed bug in rfftwnd routines where a block was accidentally

    allocated to be too small, causing random memory to be

    overwritten (yikes!).  (Amazingly, this bug only caused the

    test program to fail on one system that we could find.  Our

    test suite can now catch this sort of bug.)

  * Abstractified taking differences of times (with fftw_time_diff

    macro/function) to allow more general timer data structures.

  * Added "wisdom" mechanism for saving plans & related info.

  * Made timing mechanism more robust and maintainable.  (Instead of

    using a fixed number of iterations, we now repeatedly double

    the number of iterations until a specified time interval

    (FFTW_TIME_MIN) is reached.)

  * Fixed header files to prevent difficulties when a mix of C and

    C++ compilers is used, and to prevent problems with multiple

    inclusions.

  * Added experimental distributed-memory transforms using MPI.

  * Fixed memory leak in fftwnd_destroy_plan (reported by Richard

    Sullivan).  Our test programs now all check for leaks.

Version 1.1:

  * Improved speed (yes!) [Some clever tricks with twiddle factors

    and better code generator]

  * Renamed `blocks' to `codelets', just to be fashionable

  * Rewritten planner and executor--much simpler and more readable

    code.  Reference-counter garbage collection employed throughout.

  * Much improved codelet generator.  The ML code should be now

    readable by humans, and easier to modify.

  * Support for Prime Factor transforms in the codelet generator.

  * Renamed COMPLEX -> FFTW_COMPLEX to avoid clashes with

    existing packages.  COMPLEX is still supported

    for compatibility with 1.0

  * Added experimental real->complex transform (quick hack,

    use at your own risk).

  * Added experimental parallel transforms using Cilk.

  * Added experimental parallel transforms using threads (currently,

    POSIX threads and Solaris threads are implemented and tested).

  * Added DOS support, in the sense that we now support 8.3 filenames.

Version 1.0:  First release