@techreport {, title = {A More Portable HeFFTe: Implementing a Fallback Algorithm for Scalable Fourier Transforms}, journal = {ICL Technical Report}, number = {ICL-UT-21-04}, year = {2021}, note = {accepted at HPEC{\textquoteright}21}, month = {2021-08}, publisher = {University of Tennessee}, type = {ICL Tech Report}, author = {Daniel Sharp and Miroslav Stoyanov and Stanimire Tomov and Jack Dongarra} }