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Diffstat (limited to 'src/routines/level2/xtbmv.cc')
-rw-r--r-- | src/routines/level2/xtbmv.cc | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/src/routines/level2/xtbmv.cc b/src/routines/level2/xtbmv.cc new file mode 100644 index 00000000..2e1aebff --- /dev/null +++ b/src/routines/level2/xtbmv.cc @@ -0,0 +1,81 @@ + +// ================================================================================================= +// 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 Xtbmv class (see the header for information about the class). +// +// ================================================================================================= + +#include "internal/routines/level2/xtbmv.h" + +#include <string> +#include <vector> + +namespace clblast { +// ================================================================================================= + +// Constructor: forwards to base class constructor +template <typename T> +Xtbmv<T>::Xtbmv(Queue &queue, Event &event, const std::string &name): + Xgemv<T>(queue, event, name) { +} + +// ================================================================================================= + +// The main routine +template <typename T> +StatusCode Xtbmv<T>::DoTbmv(const Layout layout, const Triangle triangle, + const Transpose a_transpose, const Diagonal diagonal, + const size_t n, const size_t k, + 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) { + + // Creates a copy of X: a temporary scratch buffer + auto scratch_buffer = Buffer<T>(context_, n*x_inc + x_offset); + try { + x_buffer.CopyTo(queue_, n*x_inc + x_offset, scratch_buffer); + } catch (...) { } // Continues: error-code is returned in MatVec + + // The data is either in the upper or lower triangle + size_t is_upper = ((triangle == Triangle::kUpper && layout != Layout::kRowMajor) || + (triangle == Triangle::kLower && layout == Layout::kRowMajor)); + + // Adds '2' to the parameter if the diagonal is unit + auto parameter = (diagonal == Diagonal::kUnit) ? is_upper + 2 : is_upper; + + // Runs the generic matrix-vector multiplication, disabling the use of fast vectorized kernels. + // The specific triangular banded matrix-accesses are implemented in the kernel guarded by the + // ROUTINE_TBMV define. + auto fast_kernels = false; + auto status = MatVec(layout, a_transpose, + n, n, static_cast<T>(1), + a_buffer, a_offset, a_ld, + scratch_buffer, x_offset, x_inc, static_cast<T>(0), + x_buffer, x_offset, x_inc, + fast_kernels, fast_kernels, + parameter, false, k, 0); + + // Returns the proper error code (renames vector Y to X) + switch(status) { + case StatusCode::kInvalidVectorY: return StatusCode::kInvalidVectorX; + case StatusCode::kInvalidIncrementY: return StatusCode::kInvalidIncrementX; + case StatusCode::kInsufficientMemoryY: return StatusCode::kInsufficientMemoryX; + default: return status; + } +} + +// ================================================================================================= + +// Compiles the templated class +template class Xtbmv<float>; +template class Xtbmv<double>; +template class Xtbmv<float2>; +template class Xtbmv<double2>; + +// ================================================================================================= +} // namespace clblast |