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//------------------------------------------------------------------------------
// GB_assign_zombie5: delete entries in C for C_replace_phase
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// For GrB_Matrix_assign, C(I,J)<M,repl>=..., if C_replace is true, and mask M
// is present, then any entry C(i,j) outside IxJ must be be deleted, if
// M(i,j)=0.
// See also GB_assign_zombie3 and GB_assign_zombie4.
// C must be sparse or hypersparse.
// C->iso is not affected.
#include "GB_assign.h"
#include "GB_assign_zombie.h"
#include "GB_subassign_methods.h"
#include "GB_ek_slice.h"
#undef GB_FREE_ALL
#define GB_FREE_ALL \
{ \
GB_WERK_POP (C_ek_slicing, int64_t) ; \
}
GrB_Info GB_assign_zombie5
(
GrB_Matrix C, // the matrix C, or a copy
const GrB_Matrix M,
const bool Mask_comp,
const bool Mask_struct,
const GrB_Index *I,
const int64_t nI,
const int Ikind,
const int64_t Icolon [3],
const GrB_Index *J,
const int64_t nJ,
const int Jkind,
const int64_t Jcolon [3],
GB_Context Context
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
ASSERT (!GB_IS_FULL (C)) ;
ASSERT (!GB_IS_BITMAP (C)) ;
ASSERT (GB_ZOMBIES_OK (C)) ;
ASSERT (GB_JUMBLED_OK (C)) ;
ASSERT (!GB_PENDING (C)) ;
ASSERT (!GB_ZOMBIES (M)) ;
ASSERT (!GB_JUMBLED (M)) ; // binary search on M
ASSERT (!GB_PENDING (M)) ;
ASSERT (!GB_aliased (C, M)) ; // NO ALIAS of C==M
//--------------------------------------------------------------------------
// get C
//--------------------------------------------------------------------------
const int64_t *restrict Ch = C->h ;
const int64_t *restrict Cp = C->p ;
// const int64_t Cnvec = C->nvec ;
int64_t *restrict Ci = C->i ;
int64_t nzombies = C->nzombies ;
const int64_t zvlen = C->vlen ;
//--------------------------------------------------------------------------
// get M
//--------------------------------------------------------------------------
const int64_t *restrict Mp = M->p ;
const int64_t *restrict Mh = M->h ;
const int8_t *restrict Mb = M->b ;
const int64_t *restrict Mi = M->i ;
const GB_void *restrict Mx = (GB_void *) (Mask_struct ? NULL : (M->x)) ;
const size_t msize = M->type->size ;
const int64_t Mnvec = M->nvec ;
const int64_t Mvlen = M->vlen ;
const bool M_is_hyper = GB_IS_HYPERSPARSE (M) ;
const bool M_is_bitmap = GB_IS_BITMAP (M) ;
const bool M_is_full = GB_IS_FULL (M) ;
const int64_t *restrict M_Yp = (M_is_hyper) ? M->Y->p : NULL ;
const int64_t *restrict M_Yi = (M_is_hyper) ? M->Y->i : NULL ;
const int64_t *restrict M_Yx = (M_is_hyper) ? M->Y->x : NULL ;
const int64_t M_hash_bits = (M_is_hyper) ? (M->Y->vdim - 1) : 0 ;
//--------------------------------------------------------------------------
// determine the number of threads to use
//--------------------------------------------------------------------------
GB_GET_NTHREADS_MAX (nthreads_max, chunk, Context) ;
//--------------------------------------------------------------------------
// slice the entries for each task
//--------------------------------------------------------------------------
int C_ntasks, C_nthreads ;
GB_WERK_DECLARE (C_ek_slicing, int64_t) ;
GB_SLICE_MATRIX (C, 64, chunk) ;
//--------------------------------------------------------------------------
// each task creates its own zombies
//--------------------------------------------------------------------------
int tid ;
#pragma omp parallel for num_threads(C_nthreads) schedule(dynamic,1) \
reduction(+:nzombies)
for (tid = 0 ; tid < C_ntasks ; tid++)
{
//----------------------------------------------------------------------
// get the task description
//----------------------------------------------------------------------
int64_t kfirst = kfirst_Cslice [tid] ;
int64_t klast = klast_Cslice [tid] ;
//----------------------------------------------------------------------
// scan vectors kfirst to klast for entries to delete
//----------------------------------------------------------------------
for (int64_t k = kfirst ; k <= klast ; k++)
{
//------------------------------------------------------------------
// get C(:,j) and determine if j is outside the list J
//------------------------------------------------------------------
int64_t j = GBH (Ch, k) ;
// j_outside is true if column j is outside the C(I,J) submatrix
bool j_outside = !GB_ij_is_in_list (J, nJ, j, Jkind, Jcolon) ;
int64_t pC_start, pC_end ;
GB_get_pA (&pC_start, &pC_end, tid, k,
kfirst, klast, pstart_Cslice, Cp, zvlen) ;
//------------------------------------------------------------------
// get M(:,j)
//------------------------------------------------------------------
// this works for M with any sparsity structure
int64_t pM_start, pM_end ;
if (M_is_hyper)
{
// M is hypersparse
GB_hyper_hash_lookup (Mp, M_Yp, M_Yi, M_Yx, M_hash_bits,
j, &pM_start, &pM_end) ;
}
else
{
// M is sparse, bitmap, or full
pM_start = GBP (Mp, j , Mvlen) ;
pM_end = GBP (Mp, j+1, Mvlen) ;
}
bool mjdense = (pM_end - pM_start) == Mvlen ;
//------------------------------------------------------------------
// iterate over all entries in C(:,j)
//------------------------------------------------------------------
for (int64_t pC = pC_start ; pC < pC_end ; pC++)
{
//--------------------------------------------------------------
// consider C(i,j)
//--------------------------------------------------------------
// C(i,j) is outside the C(I,J) submatrix if either i is
// not in the list I, or j is not in J, or both.
int64_t i = Ci [pC] ;
if (!GB_IS_ZOMBIE (i) &&
(j_outside || !GB_ij_is_in_list (I, nI, i, Ikind, Icolon)))
{
//----------------------------------------------------------
// C(i,j) is a live entry not in the C(I,J) submatrix
//----------------------------------------------------------
// Check the mask M to see if it should be deleted.
GB_MIJ_BINARY_SEARCH_OR_DENSE_LOOKUP (i) ;
if (Mask_comp)
{
// negate the mask if Mask_comp is true
mij = !mij ;
}
if (!mij)
{
// delete C(i,j) by marking it as a zombie
nzombies++ ;
Ci [pC] = GB_FLIP (i) ;
}
}
}
}
}
//--------------------------------------------------------------------------
// free workspace and return result
//--------------------------------------------------------------------------
C->nzombies = nzombies ;
GB_FREE_ALL ;
return (GrB_SUCCESS) ;
}
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