Log Message:
Changes 3.3:
* Compiling OpenMP support (--enable-openmp) now installs a fftw3_omp library,
  instead of fftw3_threads, so that OpenMP and POSIX threads (--enable-threads)
  libraries can be built and installed at the same time.
* Various minor compilation fixes, corrections of manual typos, and
  improvements to the benchmark test program.
* Add support for the AVX extensions to x86 and x86-64. The AVX code works with
  16-byte alignment (as opposed to 32-byte alignment), so there is no ABI
  change compared to FFTW 3.2.2.
* Added Fortran 2003 interface, which should be usable on most modern Fortran
  compilers (e.g. gfortran) and provides type-checked access to the the C FFTW
  interface. (The legacy Fortran-77 interface is still included also.)
* Added MPI distributed-memory transforms. Compared to 3.3alpha, the major
  changes in the MPI transforms are:
* Fixed some deadlock and crashing bugs.
* Added Fortran 2003 interface.
* Added new-array execute functions for MPI plans.
* Eliminated use of large MPI tags, since Cray MPI requires tags < 224.
* Expanded documentation.
* make check now runs MPI tests
* Some ABI changes — not binary-compatible with 3.3alpha MPI.
* Add support for quad-precision __float128 in gcc 4.6 or later (on x86.
  x86-64, and Itanium). The new routines use the fftwq_ prefix.
* Temporarily removed MIPS paired-single support due to lack of available
  hardware for testing. We hope to add it back before the final FFTW 3.3
  release; meanwhile, users who want this functionality should continue using
  FFTW 3.2.x.
* Removed support for the Cell Broadband Engine. Cell users should use FFTW
  3.2.x.
* New convenience functions fftw_alloc_real and fftw_alloc_complex to use
  fftw_malloc for real and complex arrays without typecasts or sizeof.