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Redesign GPU FFT abstraction

Gaurav Garg requested to merge gg_gpu_fft_redesign into master
  • Modify interface to allow distributed FFT implementation in future
  • Provide support for choosing FFT backend at runtime. E.g. CUFFT backend can be instantiated for single-GPU FFT but HeFFTe can be instantiated in case PME decomposition is used.

This is a pre-requisite for GPU PME-decomposition implementation.

Refs #3884

Edited by Gaurav Garg

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