Refactoring of main.cpp to improve readability (#3784)

* refactoring of main.cpp to improve readability

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* fixed bug

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/Source/Utils/WarpXrocfftUtil.cpp b/Source/Utils/WarpXrocfftUtil.cpp
new file mode 100644
index 000000000..8af65f1b6
--- /dev/null
+++ b/Source/Utils/WarpXrocfftUtil.cpp
@@ -0,0 +1,33 @@
+/* Copyright 2023 Luca Fedeli
+ *
+ * This file is part of WarpX.
+ *
+ * License: BSD-3-Clause-LBNL
+ */
+
+#include "WarpXrocfftUtil.H"
+
+#include <AMReX_Config.H>
+
+#if defined(AMREX_USE_HIP) && defined(WARPX_USE_PSATD)
+// cstddef: work-around for ROCm/rocFFT <=4.3.0
+// https://github.com/ROCmSoftwarePlatform/rocFFT/blob/rocm-4.3.0/library/include/rocfft.h#L36-L42
+#  include <cstddef>
+#  include <rocfft.h>
+#endif
+
+void
+utils::rocfft::setup()
+{
+#if defined(AMREX_USE_HIP) && defined(WARPX_USE_PSATD)
+    rocfft_setup();
+#endif
+}
+
+void
+utils::rocfft::cleanup()
+{
+#if defined(AMREX_USE_HIP) && defined(WARPX_USE_PSATD)
+    rocfft_cleanup();
+#endif
+}