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Diffstat (limited to 'src/kernels/level1/xswap.opencl')
-rw-r--r-- | src/kernels/level1/xswap.opencl | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/kernels/level1/xswap.opencl b/src/kernels/level1/xswap.opencl new file mode 100644 index 00000000..f6487b58 --- /dev/null +++ b/src/kernels/level1/xswap.opencl @@ -0,0 +1,61 @@ + +// ================================================================================================= +// 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 Xswap kernel. It contains one fast vectorized version in case of unit +// strides (incx=incy=1) and no offsets (offx=offy=0). Another version is more general, but doesn't +// support vector data-types. +// +// This kernel uses the level-1 BLAS common tuning parameters. +// +// ================================================================================================= + +// 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"( + +// ================================================================================================= + +// Full version of the kernel with offsets and strided accesses +__attribute__((reqd_work_group_size(WGS, 1, 1))) +__kernel void Xswap(const int n, + __global real* 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<n; id += get_global_size(0)) { + real temp = xgm[id*x_inc + x_offset]; + xgm[id*x_inc + x_offset] = ygm[id*y_inc + y_offset]; + ygm[id*y_inc + y_offset] = temp; + } +} + +// ================================================================================================= + +// Faster version of the kernel without offsets and strided accesses. Also assumes that 'n' is +// dividable by 'VW', 'WGS' and 'WPT'. +__attribute__((reqd_work_group_size(WGS, 1, 1))) +__kernel void XswapFast(const int n, + __global realV* xgm, + __global realV* ygm) { + #pragma unroll + for (int w=0; w<WPT; ++w) { + const int id = w*get_global_size(0) + get_global_id(0); + realV temp = xgm[id]; + xgm[id] = ygm[id]; + ygm[id] = temp; + } +} + +// ================================================================================================= + +// End of the C++11 raw string literal +)" + +// ================================================================================================= |