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//------------------------------------------------------------------------------
// GB_bitmap_expand_to_hyper: expand a compact bitmap C to hypersparse
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#define GB_FREE_ALL \
{ \
GB_phybix_free (C) ; \
GB_FREE_MEMORY (&Cp, Cp_size) ; \
GB_FREE_MEMORY (&Ch, Ch_size) ; \
GB_FREE_MEMORY (&Ci, Ci_size) ; \
}
#include "mxm/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_Werk Werk
)
{
//--------------------------------------------------------------------------
// 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) ;
GB_Ah_DECLARE (Ah, const) ; GB_Ah_PTR (Ah, A) ;
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
//--------------------------------------------------------------------------
// determine the p_is_32, j_is_32, and i_is_32 settings for the new matrix
bool Cp_is_32, Cj_is_32, Ci_is_32 ;
GB_determine_pji_is_32 (&Cp_is_32, &Cj_is_32, &Ci_is_32,
GxB_HYPERSPARSE, cnz, cvlen_final, cvdim_final, Werk) ;
size_t cpsize = (Cp_is_32) ? sizeof (uint32_t) : sizeof (uint64_t) ;
size_t cjsize = (Cj_is_32) ? sizeof (uint32_t) : sizeof (uint64_t) ;
size_t cisize = (Ci_is_32) ? sizeof (uint32_t) : sizeof (uint64_t) ;
GB_Type_code cjcode = (Cj_is_32 ) ? GB_UINT32_code : GB_UINT64_code ;
GB_Type_code bjcode = (B->j_is_32) ? GB_UINT32_code : GB_UINT64_code ;
GB_MDECL (Cp, , u) ; size_t Cp_size = 0 ;
GB_MDECL (Ci, , u) ; size_t Ci_size = 0 ;
void *Ch = NULL ; size_t Ch_size = 0 ;
Cp = GB_MALLOC_MEMORY (cvdim+1, cpsize, &Cp_size) ;
if (B_is_hyper)
{
Ch = GB_MALLOC_MEMORY (cvdim, cjsize, &Ch_size) ;
}
Ci = GB_MALLOC_MEMORY (cnz, cisize, &Ci_size) ;
if (Cp == NULL || (B_is_hyper && Ch == NULL) || Ci == NULL)
{
// out of memory
GB_FREE_ALL ;
return (GrB_OUT_OF_MEMORY) ;
}
GB_IPTR (Cp, Cp_is_32) ;
GB_IPTR (Ci, Ci_is_32) ;
//--------------------------------------------------------------------------
// construct the hyperlist of C, if B is hypersparse
//--------------------------------------------------------------------------
int nthreads_max = GB_Context_nthreads_max ( ) ;
double chunk = GB_Context_chunk ( ) ;
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) ;
GB_cast_int (Ch, cjcode, B->h, bjcode, cvdim, 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++)
{
int64_t p = pC * cvlen ;
GB_ISET (Cp, pC, p) ; // Cp [pC] = p
}
//--------------------------------------------------------------------------
// 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
ASSERT (cvlen == A->nvec) ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (pC = 0 ; pC < cnz ; pC++)
{
int64_t i = GB_IGET (Ah, pC % cvlen) ;
i = (Cb [pC]) ? i : GB_ZOMBIE (i) ;
GB_ISET (Ci, pC, i) ; // 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 ;
i = (Cb [pC]) ? i : GB_ZOMBIE (i) ;
GB_ISET (Ci, pC, i) ; // Ci [pC] = i ;
}
}
}
else
{
// C is full
if (A_is_hyper)
{
// only for C=A'*B
ASSERT (cvlen == A->nvec) ;
#pragma omp parallel for num_threads(nthreads) schedule(static)
for (pC = 0 ; pC < cnz ; pC++)
{
int64_t i = GB_IGET (Ah, pC % cvlen) ;
GB_ISET (Ci, pC, i) ; // 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 ;
GB_ISET (Ci, pC, i) ; // 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 ;
GB_nvec_nonempty_set (C, (cvlen == 0) ? 0 : cvdim) ;
C->p_is_32 = Cp_is_32 ;
C->j_is_32 = Cj_is_32 ;
C->i_is_32 = Ci_is_32 ;
// free the bitmap, if present
GB_FREE_MEMORY ((&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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