Added HEMV routine

2 files changed, 101 insertions, 1 deletions

diff --git a/src/routines/level2/xgemv.cc b/src/routines/level2/xgemv.cc
index 7505e9f7..99b282b0 100644
--- a/src/routines/level2/xgemv.cc
+++ b/src/routines/level2/xgemv.cc
@@ -32,7 +32,7 @@ template <typename T>
 Xgemv<T>::Xgemv(Queue &queue, Event &event):
     Routine<T>(queue, event, "GEMV", {"Pad", "Xgemv"}, precision_) {
   source_string_ =
-    #include "../../kernels/pad.opencl" // For SymmUpperToSquared and SymmLowerToSquared (for SYMV)
+    #include "../../kernels/pad.opencl" // For {Herm,Symm}{Upper,Lower}ToSquared (for HEMV/SYMV)
     #include "../../kernels/xgemv.opencl"
   ;
 }
diff --git a/src/routines/level2/xhemv.cc b/src/routines/level2/xhemv.cc
new file mode 100644
index 00000000..7883b7b9
--- /dev/null
+++ b/src/routines/level2/xhemv.cc
@@ -0,0 +1,100 @@
+
+// =================================================================================================
+// 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 implements the Xhemv class (see the header for information about the class).
+//
+// =================================================================================================
+
+#include "internal/routines/level2/xhemv.h"
+
+#include <string>
+#include <vector>
+
+namespace clblast {
+// =================================================================================================
+
+// Constructor: forwards to base class constructor
+template <typename T>
+Xhemv<T>::Xhemv(Queue &queue, Event &event):
+    Xgemv<T>(queue, event) {
+}
+
+// =================================================================================================
+
+// The main routine
+template <typename T>
+StatusCode Xhemv<T>::DoHemv(const Layout layout, const Triangle triangle,
+                            const size_t n,
+                            const T alpha,
+                            const Buffer<T> &a_buffer, const size_t a_offset, const size_t a_ld,
+                            const Buffer<T> &x_buffer, const size_t x_offset, const size_t x_inc,
+                            const T beta,
+                            const Buffer<T> &y_buffer, const size_t y_offset, const size_t y_inc) {
+
+  // Makes sure all dimensions are larger than zero
+  if (n == 0) { return StatusCode::kInvalidDimension; }
+
+  // Checks for validity of the squared A matrix
+  auto status = TestMatrixA(n, n, a_buffer, a_offset, a_ld, sizeof(T));
+  if (ErrorIn(status)) { return status; }
+
+  // Determines which kernel to run based on the layout (the Xgemv kernel assumes column-major as
+  // default) and on whether we are dealing with an upper or lower triangle of the hermitian matrix
+  bool is_upper = ((triangle == Triangle::kUpper && layout != Layout::kRowMajor) ||
+                   (triangle == Triangle::kLower && layout == Layout::kRowMajor));
+  auto kernel_name = (is_upper) ? "HermUpperToSquared" : "HermLowerToSquared";
+
+  // Temporary buffer for a copy of the hermitian matrix
+  try {
+    auto temp_herm = Buffer<T>(context_, n*n);
+
+    // Creates a general matrix from the hermitian matrix to be able to run the regular Xgemv
+    // routine afterwards
+    try {
+      auto& program = GetProgramFromCache();
+      auto kernel = Kernel(program, kernel_name);
+
+      // Sets the arguments for the hermitian-to-squared kernel
+      kernel.SetArgument(0, static_cast<int>(n));
+      kernel.SetArgument(1, static_cast<int>(a_ld));
+      kernel.SetArgument(2, static_cast<int>(a_offset));
+      kernel.SetArgument(3, a_buffer());
+      kernel.SetArgument(4, static_cast<int>(n));
+      kernel.SetArgument(5, static_cast<int>(n));
+      kernel.SetArgument(6, static_cast<int>(0));
+      kernel.SetArgument(7, temp_herm());
+
+      // Uses the common padding kernel's thread configuration. This is allowed, since the
+      // hermitian-to-squared kernel uses the same parameters.
+      auto global = std::vector<size_t>{Ceil(CeilDiv(n, db_["PAD_WPTX"]), db_["PAD_DIMX"]),
+                                        Ceil(CeilDiv(n, db_["PAD_WPTY"]), db_["PAD_DIMY"])};
+      auto local = std::vector<size_t>{db_["PAD_DIMX"], db_["PAD_DIMY"]};
+      status = RunKernel(kernel, global, local);
+      if (ErrorIn(status)) { return status; }
+
+      // Runs the regular Xgemv code
+      status = DoGemv(layout, Transpose::kNo, n, n, alpha,
+                      temp_herm, 0, n,
+                      x_buffer, x_offset, x_inc, beta,
+                      y_buffer, y_offset, y_inc);
+
+      // Return the status of the Xgemv routine
+      return status;
+    } catch (...) { return StatusCode::kInvalidKernel; }
+  } catch (...) { return StatusCode::kTempBufferAllocFailure; }
+}
+
+// =================================================================================================
+
+// Compiles the templated class
+template class Xhemv<float2>;
+template class Xhemv<double2>;
+
+// =================================================================================================
+} // namespace clblast