File size: 975 Bytes
d1be154 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | #pragma once
#include "../cuda_error.hpp"
namespace tf {
// ----------------------------------------------------------------------------
// row-wise matrix transpose
// ----------------------------------------------------------------------------
//
template <typename T>
__global__ void cuda_transpose(
const T* d_in,
T* d_out,
size_t rows,
size_t cols
) {
__shared__ T tile[32][32];
size_t x = blockIdx.x * 32 + threadIdx.x;
size_t y = blockIdx.y * 32 + threadIdx.y;
for(size_t i = 0; i < 32; i += 8) {
if(x < cols && (y + i) < rows) {
tile[threadIdx.y + i][threadIdx.x] = d_in[(y + i) * cols + x];
}
}
__syncthreads();
x = blockIdx.y * 32 + threadIdx.x;
y = blockIdx.x * 32 + threadIdx.y;
for(size_t i = 0; i < 32; i += 8) {
if(x < rows && (y + i) < cols) {
d_out[(y + i) * rows + x] = tile[threadIdx.x][threadIdx.y + i];
}
}
}
} // end of namespace --------------------------------------------------------
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