added GPU solve kernel for Cholesky factor

include/sylver/kernels/cuda/llt.hxx

@@ -0,0 +1,42 @@
+/// @file
+/// @copyright 2020- The Science and Technology Facilities Council (STFC)
+/// @author Jonathan Hogg
+/// @author Florent Lopez
+#pragma once
+
+#include "kernels/gpu/wrappers.hxx"
+#include "kernels/gpu/common.hxx"
+
+namespace sylver {
+namespace spldlt {
+namespace cuda {
+
+template<typename T>
+class Chol {
+
+public:
+
+   static void solve(
+         cublasHandle_t cuhandle,
+         int m, int n,
+         T const* akk, int ld_akk,
+         T* aik, int ld_aik) {
+
+      std::string context = "Chol::solve";
+      cublasStatus_t custat;
+
+      T alpha = T(1.0);
+
+      custat = sylver::gpu::dev_trsm(
+         cuhandle, CUBLAS_SIDE_RIGHT, CUBLAS_FILL_MODE_LOWER,
+         CUBLAS_OP_T, CUBLAS_DIAG_NON_UNIT,
+         m, n,
+         &alpha,
+         akk, ld_akk,
+         aik, ld_aik);
+
+      sylver::gpu::cublas_check_error(custat, context);
+   }
+};
+
+}}}