Added initial naive version of Xgemv kernel

1 files changed, 60 insertions, 0 deletions

diff --git a/src/kernels/xgemv.opencl b/src/kernels/xgemv.opencl
new file mode 100644
index 00000000..c90bc26e
--- /dev/null
+++ b/src/kernels/xgemv.opencl
@@ -0,0 +1,60 @@
+
+// =================================================================================================
+// This file is part of the CLBlast project. The project is licensed under Apache Version 2.0. This
+// project loosely follows the Google C++ styleguide and uses a tab-size of two spaces and a max-
+// width of 100 characters per line.
+//
+// Author(s):
+//   Cedric Nugteren <www.cedricnugteren.nl>
+//
+// This file contains the Xgemv kernel for matrix-vector multiplication.
+//
+// =================================================================================================
+
+// Enables loading of this file using the C++ pre-processor's #include (C++11 standard raw string
+// literal). Comment-out this line for syntax-highlighting when developing.
+R"(
+
+// =================================================================================================
+
+// Parameters set by the tuner or by the database. Here they are given a basic default value in case
+// this kernel file is used outside of the CLBlast library.
+#ifndef WGS
+  #define WGS 64     // The local work-group size
+#endif
+#ifndef WPT
+  #define WPT 1      // The amount of work-per-thread
+#endif
+#ifndef VW
+  #define VW 1       // Vector width of vectors X and Y
+#endif
+
+// =================================================================================================
+
+// The gemv kernel
+__attribute__((reqd_work_group_size(WGS, 1, 1)))
+__kernel void Xgemv(const int m, const int n, const real alpha, const real beta,
+                    const __global real* restrict agm,
+                    const __global real* restrict xgm, const int x_offset, const int x_inc,
+                    __global real* ygm, const int y_offset, const int y_inc) {
+
+  // Loops over the work that needs to be done (allows for an arbitrary number of threads)
+  #pragma unroll
+  for (int id = get_global_id(0); id<m; id += get_global_size(0)) {
+
+    // Loop over the elements of the matrix A
+    real acc;
+    SetToZero(acc);
+    for (int k=0; k<n; ++k) {
+      MultiplyAdd(acc, agm[id + m*k], xgm[k*x_inc + x_offset]);
+    }
+    AXPBY(ygm[id*y_inc + y_offset], alpha, acc, beta, ygm[id*y_inc + y_offset]);
+  }
+}
+
+// =================================================================================================
+
+// End of the C++11 raw string literal
+)";
+
+// =================================================================================================