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//------------------------------------------------------------------------------
// GB_bitmap_expand_to_hyper: expand a compact bitmap C to hypersparse
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#define GB_FREE_ALL \
{ \
GB_phybix_free (C) ; \
GB_FREE (&Cp, Cp_size) ; \
GB_FREE (&Ch, Ch_size) ; \
GB_FREE (&Ci, Ci_size) ; \
}
#include "GB_mxm.h"
GrB_Info GB_bitmap_expand_to_hyper
(
// input/output:
GrB_Matrix C,
// input
int64_t cvlen_final,
int64_t cvdim_final,
GrB_Matrix A,
GrB_Matrix B,
GB_Context Context
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
ASSERT (C != NULL && (GB_IS_BITMAP (C) || GB_IS_FULL (C))) ;
ASSERT (A != NULL && B != NULL) ;
GBURBLE ("(expand bitmap/full to hyper) ") ;
ASSERT_MATRIX_OK (C, "C to expand from bitmap/full to hyper", GB0) ;
ASSERT_MATRIX_OK (A, "A for expand C from bitmap/full to hyper", GB0) ;
ASSERT_MATRIX_OK (B, "B for expand C from bitmap/full to hyper", GB0) ;
int64_t cvlen = C->vlen ;
int64_t cvdim = C->vdim ;
int64_t cnz = cvlen * cvdim ;
bool A_is_hyper = GB_IS_HYPERSPARSE (A) ;
bool B_is_hyper = GB_IS_HYPERSPARSE (B) ;
// C is currently a subset of its final dimension, in bitmap or full form.
// It is converted back into sparse/hypersparse form, with zombies if
// bitmap, and expanded in size to be cvlen_final by cvdim_final (A->vdim
// by B->vdim for C=A'*B, or A->vlen by B->vdim for C=A*B).
//----------------------------------------------------------------------
// allocate the sparse/hypersparse structure of the final C
//----------------------------------------------------------------------
int64_t *restrict Cp = NULL ; size_t Cp_size = 0 ;
int64_t *restrict Ch = NULL ; size_t Ch_size = 0 ;
int64_t *restrict Ci = NULL ; size_t Ci_size = 0 ;
Cp = GB_MALLOC (cvdim+1, int64_t, &Cp_size) ;
Ch = NULL ;
if (B_is_hyper)
{
Ch = GB_MALLOC (cvdim, int64_t, &Ch_size) ;
}
Ci = GB_MALLOC (cnz, int64_t, &Ci_size) ;
if (Cp == NULL || (B_is_hyper && Ch == NULL) || Ci == NULL)
{
// out of memory
GB_FREE_ALL ;
return (GrB_OUT_OF_MEMORY) ;
}
//----------------------------------------------------------------------
// construct the hyperlist of C, if B is hypersparse
//----------------------------------------------------------------------
GB_GET_NTHREADS_MAX (nthreads_max, chunk, Context) ;
int nthreads = GB_nthreads (cvdim, chunk, nthreads_max) ;
if (B_is_hyper)
{
// C becomes hypersparse
ASSERT (cvdim == B->nvec) ;
GB_memcpy (Ch, B->h, cvdim * sizeof (int64_t), nthreads) ;
}
//----------------------------------------------------------------------
// construct the vector pointers of C
//----------------------------------------------------------------------
int64_t pC ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (pC = 0 ; pC < cvdim+1 ; pC++)
{
Cp [pC] = pC * cvlen ;
}
//----------------------------------------------------------------------
// construct the pattern of C from its bitmap
//----------------------------------------------------------------------
// C(i,j) becomes a zombie if not present in the bitmap
nthreads = GB_nthreads (cnz, chunk, nthreads_max) ;
int8_t *restrict Cb = C->b ;
bool C_is_bitmap = (Cb != NULL) ;
if (C_is_bitmap)
{
// C is bitmap
if (A_is_hyper)
{
// only for C=A'*B
GrB_Index *restrict Ah = (GrB_Index *) A->h ;
ASSERT (cvlen == A->nvec) ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (pC = 0 ; pC < cnz ; pC++)
{
int64_t i = Ah [pC % cvlen] ;
Ci [pC] = (Cb [pC]) ? i : GB_FLIP (i) ;
}
}
else
{
// for C=A'*B or C=A*B
ASSERT (cvlen == cvlen_final) ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (pC = 0 ; pC < cnz ; pC++)
{
int64_t i = pC % cvlen ;
Ci [pC] = (Cb [pC]) ? i : GB_FLIP (i) ;
}
}
}
else
{
// C is full
if (A_is_hyper)
{
// only for C=A'*B
GrB_Index *restrict Ah = (GrB_Index *) A->h ;
ASSERT (cvlen == A->nvec) ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (pC = 0 ; pC < cnz ; pC++)
{
int64_t i = Ah [pC % cvlen] ;
Ci [pC] = i ;
}
}
else
{
// for C=A'*B or C=A*B
ASSERT (cvlen == cvlen_final) ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (pC = 0 ; pC < cnz ; pC++)
{
int64_t i = pC % cvlen ;
Ci [pC] = i ;
}
}
}
//----------------------------------------------------------------------
// transplant the new content and finalize C
//----------------------------------------------------------------------
C->p = Cp ; Cp = NULL ; C->p_size = Cp_size ;
C->h = Ch ; Ch = NULL ; C->h_size = Ch_size ;
C->i = Ci ; Ci = NULL ; C->i_size = Ci_size ;
C->nzombies = (C_is_bitmap) ? (cnz - C->nvals) : 0 ;
C->vdim = cvdim_final ;
C->vlen = cvlen_final ;
C->nvals = cnz ;
C->nvec = cvdim ;
C->plen = cvdim ;
C->nvec_nonempty = (cvlen == 0) ? 0 : cvdim ;
// free the bitmap, if present
GB_FREE ((&C->b), C->b_size) ;
// C is now sparse or hypersparse
ASSERT_MATRIX_OK (C, "C expanded from bitmap/full to hyper", GB0) ;
ASSERT (GB_ZOMBIES_OK (C)) ;
return (GrB_SUCCESS) ;
}
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