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//------------------------------------------------------------------------------
// GB_AxB_saxpy3_coarseGus_notM_phase1: symbolic coarse Gustavson, with !M
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
{
// Initially, Hf [...] < mark for all of Hf.
// Hf [i] < mark : M(i,j)=0, C(i,j) is not yet seen.
// Hf [i] == mark : M(i,j)=1, so C(i,j) is ignored.
// Hf [i] == mark+1 : M(i,j)=0, and C(i,j) has been seen.
for (int64_t kk = kfirst ; kk <= klast ; kk++)
{
GB_GET_B_j ; // get B(:,j)
Cp [kk] = 0 ;
//----------------------------------------------------------------------
// special case when B(:,j) is empty
//----------------------------------------------------------------------
#if ( GB_B_IS_SPARSE || GB_B_IS_HYPER )
if (bjnz == 0) continue ;
#endif
//----------------------------------------------------------------------
// get M(:,j) and scatter it into the Hf workspace
//----------------------------------------------------------------------
GB_GET_M_j ; // get M(:,j)
mark += 2 ;
const int64_t f0 = mark ;
const int64_t f1 = mark+1 ;
GB_SCATTER_M_j (pM_start, pM_end, f0) ; // scatter M(:,j)
//----------------------------------------------------------------------
// count nnz in C(:,j)
//----------------------------------------------------------------------
int64_t cjnz = 0 ;
for ( ; pB < pB_end ; pB++) // scan B(:,j)
{
GB_GET_B_kj_INDEX ; // get k of B(k,j)
GB_GET_A_k ; // get A(:,k)
// scan A(:,k)
for (int64_t pA = pA_start ; pA < pA_end ; pA++)
{
GB_GET_A_ik_INDEX ; // get index i of A(i,k)
if (Hf [i] < f0) // if true, M(i,j) is 0
{
Hf [i] = f1 ; // flag C(i,j) as seen
cjnz++ ; // C(i,j) is a new entry
}
}
}
Cp [kk] = cjnz ; // count the entries in C(:,j)
}
}
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