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//------------------------------------------------------------------------------
// GB_split_sparse_template: split a single tile from a sparse matrix
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
{
//--------------------------------------------------------------------------
// get A and C, and the slicing of C
//--------------------------------------------------------------------------
#ifndef GB_ISO_SPLIT
const GB_CTYPE *restrict Ax = (GB_CTYPE *) A->x ;
GB_CTYPE *restrict Cx = (GB_CTYPE *) C->x ;
#endif
//--------------------------------------------------------------------------
// copy the tile from A to C
//--------------------------------------------------------------------------
int tid ;
#pragma omp parallel for num_threads(C_nthreads) schedule(dynamic,1)
for (tid = 0 ; tid < C_ntasks ; tid++)
{
int64_t kfirst = kfirst_Cslice [tid] ;
int64_t klast = klast_Cslice [tid] ;
for (int64_t k = kfirst ; k <= klast ; k++)
{
// int64_t jA = GBH (Ah, k+akstart) ; not needed
int64_t pC_start, pC_end ;
GB_get_pA (&pC_start, &pC_end, tid, k,
kfirst, klast, pstart_Cslice, Cp, cvlen) ;
int64_t p0 = Cp [k] ;
int64_t pA_offset = Wp [k + akstart] ;
// copy the vector from A to C
for (int64_t pC = pC_start ; pC < pC_end ; pC++)
{
// get the index of A(iA,jA)
int64_t pA = pA_offset + pC - p0 ;
int64_t iA = Ai [pA] ;
// shift the index and copy into C(i,j)
Ci [pC] = iA - aistart ;
GB_COPY (pC, pA) ;
}
}
}
done = true ;
}
#undef GB_CTYPE
#undef GB_ISO_SPLIT
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