1.2.1 (April 4, 2004)     compiles cleanly with just about every -W warning flag under the sun    reorganized kiss_fft_state so it could be read-only/const. This may be useful for embedded systems    that are willing to predeclare twiddle factors, factorization.    Fixed C_MUL,S_MUL on 16-bit platforms.    tmpbuf will only be allocated if input & output buffers are same    scratchbuf will only be allocated for ffts that are not multiples of 2,3,5     NOTE: The tmpbuf,scratchbuf changes may require synchronization code for multi-threaded apps.1.2 (Feb 23, 2004)    interface change -- cfg object is forward declaration of struct instead of void*    This maintains type saftey and lets the compiler warn/error about stupid mistakes.            (prompted by suggestion from Erik de Castro Lopo)    small speed improvements    added psdpng.c -- sample utility that will create png spectrum "waterfalls" from an input file        ( not terribly useful yet)1.1.1 (Feb 1, 2004 )    minor bug fix -- only affects odd rank, in-place, multi-dimensional FFTs1.1 : (Jan 30,2004)    split sample_code/ into test/ and tools/    Removed 2-D fft and added N-D fft (arbitrary)    modified fftutil.c to allow multi-d FFTs    Modified core fft routine to allow an input stride via kiss_fft_stride()    (eased support of multi-D ffts)    Added fast convolution filtering (FIR filtering using overlap-scrap method, with tail scrap)    Add kfc.[ch]: the KISS FFT Cache. It takes care of allocs for you ( suggested by Oscar Lesta ).1.0.1 (Dec 15, 2003)    fixed bug that occurred when nfft==1    1.0 : (Dec 14, 2003)    changed kiss_fft function from using a single buffer, to two buffers.    If the same buffer pointer is supplied for both in and out, kiss will    manage the buffer copies.    added kiss_fft2d and kiss_fftr as separate source files (declarations in kiss_fft.h )0.4 :(Nov 4,2003) optimized for radix 2,3,4,50.3 :(Oct 28, 2003) woops, version 2 didn't actually factor out any radices other than 20.2 :(Oct 27, 2003) added mixed radix, only radix 2,4 optimized versions0.1 :(May 19 2003)  initial release, radix 2 only