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//------------------------------------------------------------------------------
// GB_split_full: split a full matrix into an array of matrices
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2025, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Each output tile is first created in full form, and then conformed to its
// desired sparsity format.
#define GB_FREE_ALL \
GB_Matrix_free (&C) ;
#include "split/GB_split.h"
#include "jitifyer/GB_stringify.h"
#include "apply/GB_apply.h"
GrB_Info GB_split_full // split a full matrix
(
GrB_Matrix *Tiles, // 2D row-major array of size m-by-n
const int64_t m,
const int64_t n,
const int64_t *restrict Tile_rows, // size m+1
const int64_t *restrict Tile_cols, // size n+1
const GrB_Matrix A, // input matrix
GB_Werk Werk
)
{
//--------------------------------------------------------------------------
// get inputs
//--------------------------------------------------------------------------
GrB_Info info ;
ASSERT (GB_IS_FULL (A)) ;
GrB_Matrix C = NULL ;
int sparsity_control = A->sparsity_control ;
float hyper_switch = A->hyper_switch ;
bool csc = A->is_csc ;
GrB_Type atype = A->type ;
int64_t avlen = A->vlen ;
size_t asize = atype->size ;
const bool A_iso = A->iso ;
int nthreads_max = GB_Context_nthreads_max ( ) ;
double chunk = GB_Context_chunk ( ) ;
int64_t nouter = csc ? n : m ;
int64_t ninner = csc ? m : n ;
const int64_t *Tile_vdim = csc ? Tile_cols : Tile_rows ;
const int64_t *Tile_vlen = csc ? Tile_rows : Tile_cols ;
//--------------------------------------------------------------------------
// split A into tiles
//--------------------------------------------------------------------------
for (int64_t outer = 0 ; outer < nouter ; outer++)
{
const int64_t avstart = Tile_vdim [outer] ;
const int64_t avend = Tile_vdim [outer+1] ;
for (int64_t inner = 0 ; inner < ninner ; inner++)
{
//------------------------------------------------------------------
// allocate the tile C
//------------------------------------------------------------------
// The tile appears in vectors avstart:avend-1 of A, and indices
// aistart:aiend-1.
const int64_t aistart = Tile_vlen [inner] ;
const int64_t aiend = Tile_vlen [inner+1] ;
const int64_t cvdim = avend - avstart ;
const int64_t cvlen = aiend - aistart ;
int64_t cnz = cvdim * cvlen ;
C = NULL ;
GB_OK (GB_new_bix (&C, // new header
atype, cvlen, cvdim, GB_ph_null, csc, GxB_FULL, false,
hyper_switch, 0, cnz, true, A_iso,
/* OK: */ false, false, false)) ;
C->sparsity_control = sparsity_control ;
C->hyper_switch = hyper_switch ;
int C_nthreads = GB_nthreads (cnz, chunk, nthreads_max) ;
//------------------------------------------------------------------
// copy the tile from A into C
//------------------------------------------------------------------
info = GrB_NO_VALUE ;
if (A_iso)
{
//--------------------------------------------------------------
// split an iso matrix A into an iso tile C
//--------------------------------------------------------------
// A is iso and so is C; copy the iso entry
memcpy (C->x, A->x, asize) ;
info = GrB_SUCCESS ;
}
else
{
//--------------------------------------------------------------
// split a non-iso matrix A into an non-iso tile C
//--------------------------------------------------------------
#ifndef GBCOMPACT
GB_IF_FACTORY_KERNELS_ENABLED
{
// no typecasting needed
switch (asize)
{
#define GB_COPY(pC,pA) Cx [pC] = Ax [pA]
case GB_1BYTE : // uint8, int8, bool, or 1-byte user
#define GB_C_TYPE uint8_t
#define GB_A_TYPE uint8_t
#include "split/template/GB_split_full_template.c"
info = GrB_SUCCESS ;
break ;
case GB_2BYTE : // uint16, int16, or 2-byte user
#define GB_C_TYPE uint16_t
#define GB_A_TYPE uint16_t
#include "split/template/GB_split_full_template.c"
info = GrB_SUCCESS ;
break ;
case GB_4BYTE : // uint32, int32, float, or 4-byte user
#define GB_C_TYPE uint32_t
#define GB_A_TYPE uint32_t
#include "split/template/GB_split_full_template.c"
info = GrB_SUCCESS ;
break ;
case GB_8BYTE : // uint64, int64, double, float
// complex, or 8-byte user
#define GB_C_TYPE uint64_t
#define GB_A_TYPE uint64_t
#include "split/template/GB_split_full_template.c"
info = GrB_SUCCESS ;
break ;
case GB_16BYTE : // double complex or 16-byte user
#define GB_C_TYPE GB_blob16
#define GB_A_TYPE GB_blob16
#include "split/template/GB_split_full_template.c"
info = GrB_SUCCESS ;
break ;
default:;
}
}
#endif
//--------------------------------------------------------------
// via the JIT or PreJIT kernel
//--------------------------------------------------------------
if (info == GrB_NO_VALUE)
{
struct GB_UnaryOp_opaque op_header ;
GB_Operator op = GB_unop_identity (atype, &op_header) ;
ASSERT_OP_OK (op, "id op for split full", GB0) ;
info = GB_split_full_jit (C, op, A, avstart, aistart,
C_nthreads) ;
}
//--------------------------------------------------------------
// via the generic kernel
//--------------------------------------------------------------
if (info == GrB_NO_VALUE)
{
GBURBLE ("(generic split) ") ;
#define GB_C_TYPE GB_void
#define GB_A_TYPE GB_void
#undef GB_COPY
#define GB_COPY(pC,pA) \
memcpy (Cx +(pC)*asize, Ax +(pA)*asize, asize) ;
#include "split/template/GB_split_full_template.c"
info = GrB_SUCCESS ;
}
GB_OK (info) ;
}
//------------------------------------------------------------------
// conform the tile and save it in the Tiles array
//------------------------------------------------------------------
C->magic = GB_MAGIC ;
ASSERT_MATRIX_OK (C, "C for GB_split", GB0) ;
GB_OK (GB_conform (C, Werk)) ;
if (csc)
{
GB_TILE (Tiles, inner, outer) = C ;
}
else
{
GB_TILE (Tiles, outer, inner) = C ;
}
C = NULL ;
}
}
return (GrB_SUCCESS) ;
}
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