Case Study of Using Kokkos and SYCL as Performance-Portable Frameworks for Milc-Dslash Benchmark on NVIDIA, AMD and Intel GPUs - Dufek, Amanda S.; Gayatri, Rahulkumar; Mehta, Neil; Doerfler, Douglas; Cook, Brandon; Ghadar, Yasaman; DeTar, Carleton (2021 International Workshop on Performance, Portability and Productivity in HPC (P3HPC), Performance, Portability and Productivity in HPC (P3HPC), 2021 International Workshop on, P3HPC, 2021)