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//------------------------------------------------------------------------------
// GB_bitmap_subref: C = A(I,J) where A is bitmap or full
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// C=A(I,J), where A is bitmap or full, symbolic and numeric.
// See GB_subref for details.
#include "GB_subref.h"
#include "GB_subassign_IxJ_slice.h"
#define GB_FREE_ALL \
{ \
GB_phybix_free (C) ; \
}
GrB_Info GB_bitmap_subref // C = A(I,J): either symbolic or numeric
(
// output
GrB_Matrix C, // output matrix, static header
// input, not modified
const bool C_iso, // if true, C is iso
const GB_void *cscalar, // scalar value of C, if iso
const bool C_is_csc, // requested format of C
const GrB_Matrix A,
const GrB_Index *I, // index list for C = A(I,J), or GrB_ALL, etc.
const int64_t ni, // length of I, or special
const GrB_Index *J, // index list for C = A(I,J), or GrB_ALL, etc.
const int64_t nj, // length of J, or special
const bool symbolic, // if true, construct C as symbolic
GB_Context Context
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
GrB_Info info ;
ASSERT (C != NULL && (C->static_header || GBNSTATIC)) ;
ASSERT_MATRIX_OK (A, "A for C=A(I,J) bitmap subref", GB0) ;
ASSERT (GB_IS_BITMAP (A) || GB_IS_FULL (A)) ;
ASSERT (!GB_IS_SPARSE (A)) ;
ASSERT (!GB_IS_HYPERSPARSE (A)) ;
ASSERT (!GB_ZOMBIES (A)) ;
ASSERT (!GB_JUMBLED (A)) ;
ASSERT (!GB_PENDING (A)) ;
//--------------------------------------------------------------------------
// get A
//--------------------------------------------------------------------------
const int8_t *restrict Ab = A->b ;
const int64_t avlen = A->vlen ;
const int64_t avdim = A->vdim ;
const size_t asize = A->type->size ;
//--------------------------------------------------------------------------
// check the properties of I and J
//--------------------------------------------------------------------------
// C = A(I,J) so I is in range 0:avlen-1 and J is in range 0:avdim-1
int64_t nI, nJ, Icolon [3], Jcolon [3] ;
int Ikind, Jkind ;
GB_ijlength (I, ni, avlen, &nI, &Ikind, Icolon) ;
GB_ijlength (J, nj, avdim, &nJ, &Jkind, Jcolon) ;
bool I_unsorted, I_has_dupl, I_contig, J_unsorted, J_has_dupl, J_contig ;
int64_t imin, imax, jmin, jmax ;
info = GB_ijproperties (I, ni, nI, avlen, &Ikind, Icolon,
&I_unsorted, &I_has_dupl, &I_contig, &imin, &imax, Context) ;
if (info != GrB_SUCCESS)
{
// I invalid
return (info) ;
}
info = GB_ijproperties (J, nj, nJ, avdim, &Jkind, Jcolon,
&J_unsorted, &J_has_dupl, &J_contig, &jmin, &jmax, Context) ;
if (info != GrB_SUCCESS)
{
// J invalid
return (info) ;
}
//--------------------------------------------------------------------------
// allocate C
//--------------------------------------------------------------------------
int64_t cnzmax ;
bool ok = GB_int64_multiply ((GrB_Index *) (&cnzmax), nI, nJ) ;
if (!ok) cnzmax = INT64_MAX ;
GrB_Type ctype = symbolic ? GrB_INT64 : A->type ;
int sparsity = GB_IS_BITMAP (A) ? GxB_BITMAP : GxB_FULL ;
// set C->iso = C_iso OK
GB_OK (GB_new_bix (&C, // bitmap or full, existing header
ctype, nI, nJ, GB_Ap_null, C_is_csc,
sparsity, true, A->hyper_switch, -1, cnzmax, true, C_iso, Context)) ;
//--------------------------------------------------------------------------
// get C
//--------------------------------------------------------------------------
int8_t *restrict Cb = C->b ;
// In GB_bitmap_assign_IxJ_template, vlen is the vector length of the
// submatrix C(I,J), but here the template is used to access A(I,J), and so
// the vector length is A->vlen, not C->vlen. The pointers pA and pC are
// swapped in the macros below, since C=A(I,J) is being computed, instead
// of C(I,J)=A for the bitmap assignment.
int64_t vlen = avlen ;
//--------------------------------------------------------------------------
// C = A(I,J)
//--------------------------------------------------------------------------
int64_t cnvals = 0 ;
if (sparsity == GxB_BITMAP)
{
//----------------------------------------------------------------------
// C = A (I,J) where A and C are both bitmap
//----------------------------------------------------------------------
// symbolic subref is only used by GB_subassign_symbolic, which only
// operates on a matrix that is hypersparse, sparse, or full, but not
// bitmap. As a result, the symbolic subref C=A(I,J) where both A and
// C are bitmap is not needed. The code is left here in case it is
// needed in the future.
ASSERT (!symbolic) ;
#if 0
if (symbolic)
{
// C=A(I,J) symbolic with A and C bitmap
ASSERT (GB_DEAD_CODE) ;
int64_t *restrict Cx = (int64_t *) C->x ;
#undef GB_IXJ_WORK
#define GB_IXJ_WORK(pA,pC) \
{ \
int8_t ab = Ab [pA] ; \
Cb [pC] = ab ; \
Cx [pC] = pA ; \
task_cnvals += ab ; \
}
#include "GB_bitmap_assign_IxJ_template.c"
}
else
#endif
if (C_iso)
{
//------------------------------------------------------------------
// C=A(I,J) iso numeric with A and C bitmap
//------------------------------------------------------------------
memcpy (C->x, cscalar, ctype->size) ;
#undef GB_IXJ_WORK
#define GB_IXJ_WORK(pA,pC) \
{ \
int8_t ab = Ab [pA] ; \
Cb [pC] = ab ; \
task_cnvals += ab ; \
}
#include "GB_bitmap_assign_IxJ_template.c"
}
else
{
//------------------------------------------------------------------
// C=A(I,J) non-iso numeric with A and C bitmap; both non-iso
//------------------------------------------------------------------
const GB_void *restrict Ax = (GB_void *) A->x ;
GB_void *restrict Cx = (GB_void *) C->x ;
#undef GB_IXJ_WORK
#define GB_IXJ_WORK(pA,pC) \
{ \
int8_t ab = Ab [pA] ; \
Cb [pC] = ab ; \
if (ab) \
{ \
/* Cx [pC] = Ax [pA] */ \
memcpy (Cx +((pC)*asize), Ax +((pA)*asize), asize) ; \
task_cnvals++ ; \
} \
}
#include "GB_bitmap_assign_IxJ_template.c"
}
C->nvals = cnvals ;
}
else
{
//----------------------------------------------------------------------
// C = A (I,J) where A and C are both full
//----------------------------------------------------------------------
if (symbolic)
{
//------------------------------------------------------------------
// C=A(I,J) symbolic with A and C full (from GB_subassign_symbolic)
//------------------------------------------------------------------
int64_t *restrict Cx = (int64_t *) C->x ;
#undef GB_IXJ_WORK
#define GB_IXJ_WORK(pA,pC) \
{ \
Cx [pC] = pA ; \
}
#include "GB_bitmap_assign_IxJ_template.c"
}
else if (C_iso)
{
//------------------------------------------------------------------
// C=A(I,J) iso numeric with A and C full
//------------------------------------------------------------------
memcpy (C->x, cscalar, ctype->size) ;
}
else
{
//------------------------------------------------------------------
// C=A(I,J) non-iso numeric with A and C full, both are non-iso
//------------------------------------------------------------------
const GB_void *restrict Ax = (GB_void *) A->x ;
GB_void *restrict Cx = (GB_void *) C->x ;
#undef GB_IXJ_WORK
#define GB_IXJ_WORK(pA,pC) \
{ \
/* Cx [pC] = Ax [pA] */ \
memcpy (Cx +((pC)*asize), Ax +((pA)*asize), asize) ; \
}
#include "GB_bitmap_assign_IxJ_template.c"
}
}
//--------------------------------------------------------------------------
// return result
//--------------------------------------------------------------------------
C->magic = GB_MAGIC ;
ASSERT_MATRIX_OK (C, "C output for bitmap subref C=A(I,J)", GB0) ;
return (GrB_SUCCESS) ;
}
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