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// =================================================================================================
// 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 common kernels shared among different BLAS routines. This file contains
// kernels to copy and pad matrices in various ways, including:
// 1) copying into a larger matrix by adding padding
// 2) copying into a smaller matrix by removing padding
// 3) from upper/lower triangle into a full matrix
//
// =================================================================================================
// 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 PAD_DIMX
#define PAD_DIMX 8 // Local workgroup size in the first dimension (x)
#endif
#ifndef PAD_DIMY
#define PAD_DIMY 8 // Local workgroup size in the second dimension (y)
#endif
#ifndef PAD_WPTX
#define PAD_WPTX 1 // Work per thread in the first dimension (x)
#endif
#ifndef PAD_WPTY
#define PAD_WPTY 1 // Work per thread in the second dimension (y)
#endif
// =================================================================================================
// Copies a matrix from source to destination. The output is padded with zero values in case the
// destination matrix dimensions are larger than the source matrix dimensions. Additionally, the ld
// value and offset can be different.
__attribute__((reqd_work_group_size(PAD_DIMX, PAD_DIMY, 1)))
__kernel void PadMatrix(const int src_one, const int src_two,
const int src_ld, const int src_offset,
__global const real* restrict src,
const int dest_one, const int dest_two,
const int dest_ld, const int dest_offset,
__global real* dest,
const int do_conjugate) {
// Loops over the work per thread in both dimensions
#pragma unroll
for (int w_one=0; w_one<PAD_WPTX; ++w_one) {
const int id_one = (get_group_id(0)*PAD_WPTX + w_one) * PAD_DIMX + get_local_id(0);
#pragma unroll
for (int w_two=0; w_two<PAD_WPTY; ++w_two) {
const int id_two = (get_group_id(1)*PAD_WPTY + w_two) * PAD_DIMY + get_local_id(1);
if (id_two < dest_two && id_one < dest_one) {
// Loads data if the thread IDs are within bounds of the source matrix. Otherwise, set the
// value to be written to zero.
real value;
SetToZero(value);
if (id_two < src_two && id_one < src_one) {
value = src[id_two*src_ld + id_one + src_offset];
}
// Stores the value in the destination matrix
if (do_conjugate == 1) { COMPLEX_CONJUGATE(value); }
dest[id_two*dest_ld + id_one + dest_offset] = value;
}
}
}
}
// =================================================================================================
// Same as above, but now un-pads a matrix. This kernel reads data from a padded source matrix, but
// writes only the actual data back to the destination matrix. Again, the ld value and offset can
// be different.
__attribute__((reqd_work_group_size(PAD_DIMX, PAD_DIMY, 1)))
__kernel void UnPadMatrix(const int src_one, const int src_two,
const int src_ld, const int src_offset,
__global const real* restrict src,
const int dest_one, const int dest_two,
const int dest_ld, const int dest_offset,
__global real* dest) {
// Loops over the work per thread in both dimensions
#pragma unroll
for (int w_one=0; w_one<PAD_WPTX; ++w_one) {
const int id_one = (get_group_id(0)*PAD_WPTX + w_one) * PAD_DIMX + get_local_id(0);
#pragma unroll
for (int w_two=0; w_two<PAD_WPTY; ++w_two) {
const int id_two = (get_group_id(1)*PAD_WPTY + w_two) * PAD_DIMY + get_local_id(1);
if (id_two < dest_two && id_one < dest_one) {
// Copies the value into the destination matrix. This is always within bounds of the source
// matrix, as we know that the destination matrix is smaller than the source.
dest[id_two*dest_ld + id_one + dest_offset] = src[id_two*src_ld + id_one + src_offset];
}
}
}
}
// =================================================================================================
// Kernel to populate a squared symmetric matrix, given that the triangle which holds the data is
// stored as the lower-triangle of the input matrix. This uses the padding kernel's parameters.
__attribute__((reqd_work_group_size(PAD_DIMX, PAD_DIMY, 1)))
__kernel void SymmLowerToSquared(const int src_dim,
const int src_ld, const int src_offset,
__global const real* restrict src,
const int dest_dim,
const int dest_ld, const int dest_offset,
__global real* dest) {
// Loops over the work per thread in both dimensions
#pragma unroll
for (int w_one=0; w_one<PAD_WPTX; ++w_one) {
const int id_one = (get_group_id(0)*PAD_WPTX + w_one) * PAD_DIMX + get_local_id(0);
#pragma unroll
for (int w_two=0; w_two<PAD_WPTY; ++w_two) {
const int id_two = (get_group_id(1)*PAD_WPTY + w_two) * PAD_DIMY + get_local_id(1);
if (id_two < dest_dim && id_one < dest_dim) {
// Loads data from the lower-symmetric matrix
real value;
SetToZero(value);
if (id_two < src_dim && id_one < src_dim) {
if (id_two <= id_one) { value = src[id_two*src_ld + id_one + src_offset]; }
else { value = src[id_one*src_ld + id_two + src_offset]; }
}
// Stores the value in the destination matrix
dest[id_two*dest_ld + id_one + dest_offset] = value;
}
}
}
}
// Same as above, but now the matrix' data is stored in the upper-triangle
__attribute__((reqd_work_group_size(PAD_DIMX, PAD_DIMY, 1)))
__kernel void SymmUpperToSquared(const int src_dim,
const int src_ld, const int src_offset,
__global const real* restrict src,
const int dest_dim,
const int dest_ld, const int dest_offset,
__global real* dest) {
// Loops over the work per thread in both dimensions
#pragma unroll
for (int w_one=0; w_one<PAD_WPTX; ++w_one) {
const int id_one = (get_group_id(0)*PAD_WPTX + w_one) * PAD_DIMX + get_local_id(0);
#pragma unroll
for (int w_two=0; w_two<PAD_WPTY; ++w_two) {
const int id_two = (get_group_id(1)*PAD_WPTY + w_two) * PAD_DIMY + get_local_id(1);
if (id_two < dest_dim && id_one < dest_dim) {
// Loads data from the upper-symmetric matrix
real value;
SetToZero(value);
if (id_two < src_dim && id_one < src_dim) {
if (id_one <= id_two) { value = src[id_two*src_ld + id_one + src_offset]; }
else { value = src[id_one*src_ld + id_two + src_offset]; }
}
// Stores the value in the destination matrix
dest[id_two*dest_ld + id_one + dest_offset] = value;
}
}
}
}
// =================================================================================================
// End of the C++11 raw string literal
)";
// =================================================================================================
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