diff options
Diffstat (limited to 'nerv/lib/matrix/generic/cukernel.cu')
-rw-r--r-- | nerv/lib/matrix/generic/cukernel.cu | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/nerv/lib/matrix/generic/cukernel.cu b/nerv/lib/matrix/generic/cukernel.cu index e337798..08feb59 100644 --- a/nerv/lib/matrix/generic/cukernel.cu +++ b/nerv/lib/matrix/generic/cukernel.cu @@ -284,6 +284,15 @@ __global__ void cudak_(gen_col_idx)(MATRIX_ELEM *b, b[j + i * stride] = j; } +__global__ void cudak_(copy_rows_by_idx)(const MATRIX_ELEM *a, MATRIX_ELEM *b, + const MATRIX_ELEM *idx, int b_begin, + int nrow, int ncol, int stride) { + int j = blockIdx.x * blockDim.x + threadIdx.x; + int i = blockIdx.y * blockDim.y + threadIdx.y; + if (i >= nrow || j >= ncol) return; + b[j + i * stride] = a[j + lrintf(idx[i]) * stride]; +} + extern "C" { #include "../cukernel.h" void cudak_(cuda_log_elem)(const Matrix *a, Matrix *b) { @@ -589,5 +598,16 @@ extern "C" { b->stride / sizeof(MATRIX_ELEM)); cudaStreamSynchronize(0); } + + void cudak_(cuda_copy_rows_by_idx)(const Matrix *a, Matrix *b, + const Matrix *idx, int b_begin) { + dim3 threadsPerBlock(CUDA_THREADS_NN, 1); + dim3 numBlocks(CEIL_DIV(b->ncol, threadsPerBlock.x), b->nrow); + cudak_(copy_rows_by_idx)<<<numBlocks, threadsPerBlock>>> \ + (MATRIX_ELEM_PTR(a), MATRIX_ELEM_PTR(b), + MATRIX_ELEM_PTR(idx) + b_begin, + b_begin, b->nrow, b->ncol, b->stride / sizeof(MATRIX_ELEM)); + cudaStreamSynchronize(0); + } } #endif |