kissfft

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No optimized inverse FFT implementation for real time-domain data

5

In the C++ implementation, we now have optimized FFT implementation for real input. However the ifft counterpart of the optimized implementation cannot be found. Given that the implementation I mentioned...

seeker-Liu

Allow setting a suffix for constants and trigonometric functions

6

This is similar to #12, but for the C version. The C version uses sin() and cos() and constants (for pi) which are not accurate enough for long double. In...

steffen-kiess

AVX ?

9

Hi, considering the great improvement of the SIMD variant, what about an AVX version that would process the lines 8 by 8 ? Do you see that as doable ?...

gjaegy

Data stride in N-D FFTs

3

Your library works very nicely for a spatial distribution of 1D (i.e. scalar) data! However, the transformation of 3D (i.e. vector) data can be more tricky, if the data is...

GPMueller

DIVSCALAR off by 1

2

The current fixed point DIVSCALAR multiplies by SAMP_MAX which is off by 1 ``` # define DIVSCALAR(x,k) \ (x) = sround( smul( x, SAMP_MAX/k ) ) ``` which produces 0.999938965...

fbarchard

Always include it to fix cross-compiling. This should not break Windows. Closes: https://github.com/mborgerding/kissfft/issues/65

chewi

By default, CMake assumes that the project is using both C and C++. By explicitly passing 'C' as argument of the project() macro, we tell CMake that only C is...

bkuhls

The README says: > The core routines of kiss_fft are thread-safe What exactly does it mean? That the functions are re-entrant, i. e. safe to call from different threads as...

VioletGiraffe

Hi, I was wondering what method you use for FFT size not equal to a power of two (chirp z-transform or factorization). I picked up even lengths with prime factors...

vitalsong

Typo in testcpp.cc

1

Is this a typo? When I change to `M_PI` the build works, otherwise I get a build error. https://github.com/mborgerding/kissfft/blob/8f47a67f595a6641c566087bf5277034be64f24d/test/testcpp.cc#L46 The error: ```sh [ 96%] Building CXX object test/CMakeFiles/testcpp.dir/testcpp.cc.o /Users/davorin/Code/projects/fft/kissfft/test/testcpp.cc:46:35: error:...

dsego