Function GB_split_bitmap

deps/GraphBLAS/Source/GB_split_bitmap.c:15–194

#include "GB_split.h"

GrB_Info GB_split_bitmap            // split a bitmap matrix
(
    GrB_Matrix *Tiles,              // 2D row-major array of size m-by-n
    const GrB_Index m,
    const GrB_Index n,
    const int64_t *restrict Tile_rows,  // size m+1
    const int64_t *restrict Tile_cols,  // size n+1
    const GrB_Matrix A,             // input matrix
    GB_Context Context
)
{

    //--------------------------------------------------------------------------
    // get inputs
    //--------------------------------------------------------------------------

    GrB_Info info ;
    ASSERT (GB_IS_BITMAP (A)) ;
    GrB_Matrix C = NULL ;

    int sparsity_control = A->sparsity_control ;
    float hyper_switch = A->hyper_switch ;
    bool csc = A->is_csc ;
    GrB_Type atype = A->type ;
    int64_t avlen = A->vlen ;
//  int64_t avdim = A->vdim ;
    size_t asize = atype->size ;
    const int8_t *restrict Ab = A->b ;
    const bool A_iso = A->iso ;
//  int64_t anz = GB_nnz (A) ;

    GB_GET_NTHREADS_MAX (nthreads_max, chunk, Context) ;

    int64_t nouter = csc ? n : m ;
    int64_t ninner = csc ? m : n ;

    const int64_t *Tile_vdim = csc ? Tile_cols : Tile_rows ;
    const int64_t *Tile_vlen = csc ? Tile_rows : Tile_cols ;

    //--------------------------------------------------------------------------
    // split A into tiles
    //--------------------------------------------------------------------------

    for (int64_t outer = 0 ; outer < nouter ; outer++)
    {

        const int64_t avstart = Tile_vdim [outer] ;
        const int64_t avend   = Tile_vdim [outer+1] ;

        for (int64_t inner = 0 ; inner < ninner ; inner++)
        {

            //------------------------------------------------------------------
            // allocate the tile C
            //------------------------------------------------------------------

            // The tile appears in vectors avstart:avend-1 of A, and indices
            // aistart:aiend-1.