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//------------------------------------------------------------------------------
// GB_select.h: definitions for GrB_select and related functions
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
#ifndef GB_SELECT_H
#define GB_SELECT_H
#include "GB.h"
#include "GB_is_nonzero.h"
GrB_Info GB_select // C<M> = accum (C, select(A,k)) or select(A',k)
(
GrB_Matrix C, // input/output matrix for results
const bool C_replace, // C descriptor
const GrB_Matrix M, // optional mask for C, unused if NULL
const bool Mask_comp, // descriptor for M
const bool Mask_struct, // if true, use the only structure of M
const GrB_BinaryOp accum, // optional accum for Z=accum(C,T)
const GB_Operator op, // GxB_SelectOp or GrB_IndexUnaryOp
const GrB_Matrix A, // input matrix
const GrB_Scalar Thunk_in, // optional input for select operator
const bool A_transpose, // A matrix descriptor
GB_Context Context
) ;
GrB_Info GB_selector
(
GrB_Matrix C, // output matrix, NULL or static header
GB_Opcode opcode, // selector opcode
const GB_Operator op, // user GxB_SelectOp or GrB_IndexUnaryOp op
const bool flipij, // if true, flip i and j for user operator
GrB_Matrix A, // input matrix
int64_t ithunk, // (int64_t) Thunk, if Thunk is NULL
const GrB_Scalar Thunk, // optional input for select operator
GB_Context Context
) ;
GrB_Info GB_bitmap_selector
(
GrB_Matrix C, // output matrix, static header
const bool C_iso, // if true, C is iso
GB_Opcode opcode, // selector/idxunop opcode
const GB_Operator op,
const bool flipij, // if true, flip i and j for user operator
GrB_Matrix A, // input matrix
const int64_t ithunk, // (int64_t) Thunk, if Thunk is NULL
const GB_void *restrict athunk, // (A->type) Thunk
const GB_void *restrict ythunk, // (op->utype) Thunk
GB_Context Context
) ;
//------------------------------------------------------------------------------
// GB_iso_select: assign the iso value of C for GB_*selector
//------------------------------------------------------------------------------
static inline void GB_iso_select
(
void *Cx, // output iso value
const GB_Opcode opcode, // selector opcode
const void *athunk, // thunk scalar, of size asize
const void *Ax, // Ax [0] scalar, of size asize
const GB_Type_code acode, // the type code of Ax
const size_t asize
)
{
if (opcode == GB_EQ_ZERO_selop_code)
{
// all entries in C are zero
memset (Cx, 0, asize) ;
}
else if (opcode == GB_EQ_THUNK_selop_code)
{
// all entries in C are equal to thunk
memcpy (Cx, athunk, asize) ;
}
else if (opcode == GB_NONZERO_selop_code && acode == GB_BOOL_code)
{
// all entries in C are true; C and A are boolean
memset (Cx, 1, 1) ;
}
else
{
// A and C are both iso
memcpy (Cx, Ax, asize) ;
}
}
//------------------------------------------------------------------------------
// compiler diagnostics
//------------------------------------------------------------------------------
// Some parameters are unused for some uses of the Generated2/GB_sel_* functions
#include "GB_unused.h"
#endif
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