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In this paper, we present an early version of a SYCL-based FFT library,capable of running on all major vendor hardware, including CPUs and GPUs fromAMD, ARM, Intel and NVIDIA. Although preliminary, the aim of this work is toseed further developments for a rich set of features for calculating FFTs. Ithas the advantage over existing portable FFT libraries in that it issingle-source, and therefore removes the complexities that arise due toabundant use of pre-process macros and auto-generated kernels to targetdifferent architectures. We exercise two SYCL-enabled compilers, CodeplayComputeCpp and Intel's open-source LLVM project, to evaluate performanceportability of our SYCL-based FFT on various heterogeneous architectures. Thecurrent limitations of our library is it supports single-dimension FFTs up to$2^{11}$ in length and base-2 input sequences. We compare our results withhighly optimized vendor specific FFT libraries and provide a detailed analysisto demonstrate a fair level of performance, as well as potential sources ofperformance bottlenecks.

Benchmarking a Proof-of-Concept Performance Portable SYCL-based Fast Fourier Transformation Library