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Diffstat (limited to 'src/kernels/level2/xher.opencl')
-rw-r--r-- | src/kernels/level2/xher.opencl | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/src/kernels/level2/xher.opencl b/src/kernels/level2/xher.opencl new file mode 100644 index 00000000..edb94ca8 --- /dev/null +++ b/src/kernels/level2/xher.opencl @@ -0,0 +1,73 @@ + +// ================================================================================================= +// 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 Xher kernels for rank-1 matrix update. +// +// ================================================================================================= + +// 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"( + +// ================================================================================================= + +// Symmetric version of the rank-1 matrix update kernel (HER, HPR, SYR, SPR) +__attribute__((reqd_work_group_size(WGS1, WGS2, 1))) +__kernel void Xher(const int n, const real alpha, + const __global real* restrict xgm, const int x_offset, const int x_inc, + __global real* restrict agm, const int a_offset, const int a_ld, + const int is_upper, const int is_rowmajor) { + + // Register storage for X and XT + real xvalues[WPT]; + real xtvalues[WPT]; + + // Loads the X-vector + #pragma unroll + for (int w=0; w<WPT; ++w) { + const int id2 = w*get_global_size(1) + get_global_id(1); + xvalues[w] = LoadVector(id2, n, xgm, x_offset, x_inc, !is_rowmajor); + } + + // Loads the X-transposed-vector + #pragma unroll + for (int w=0; w<WPT; ++w) { + const int id1 = w*get_global_size(0) + get_global_id(0); + xtvalues[w] = LoadVector(id1, n, xgm, x_offset, x_inc, is_rowmajor); + } + + // Loops over the work per thread twice + #pragma unroll + for (int w1=0; w1<WPT; ++w1) { + #pragma unroll + for (int w2=0; w2<WPT; ++w2) { + + // Global thread IDs + const int id1 = w1*get_global_size(0) + get_global_id(0); + const int id2 = w2*get_global_size(1) + get_global_id(1); + + // Skip these threads if they do not contain threads contributing to the matrix-triangle + if ((is_upper && (id1 > id2)) || (!is_upper && (id2 > id1))) { + // Do nothing + } + + // Loads A, performs the operation, and stores the result into A + else { + MatrixUpdate(id1, id2, n, n, agm, a_offset, a_ld, alpha, xvalues[w2], xtvalues[w1], is_upper); + } + } + } +} + +// ================================================================================================= + +// End of the C++11 raw string literal +)" + +// ================================================================================================= |