Numerical stability of cufftExecC2C

Hi,

I have performed the 1d convolution on 2 vectors using cufftExecC2C but the resulting accuracy seems to depend on their values.
Therefore, I’m looking out for some info on the accuracy and precision of the FFT. In particular, I’d like to know the numerical stability of the FFT forward and of the inverse one to check the worst case of round-off error that might occurs and that might depends on the hardware GPU. Where can I find it?

Regards,

Here is the section on accuracy and performance cuFFT :: CUDA Toolkit Documentation

Thanks!