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//------------------------------------------------------------------------------
// LAGraph_Cached_EMax: determine G->emax
//------------------------------------------------------------------------------
// LAGraph, (c) 2019-2022 by The LAGraph Contributors, All Rights Reserved.
// SPDX-License-Identifier: BSD-2-Clause
//
// For additional details (including references to third party source code and
// other files) see the LICENSE file or contact permission@sei.cmu.edu. See
// Contributors.txt for a full list of contributors. Created, in part, with
// funding and support from the U.S. Government (see Acknowledgments.txt file).
// DM22-0790
// Contributed by Timothy A. Davis, Texas A&M University
//------------------------------------------------------------------------------
#define LG_FREE_ALL \
{ \
GrB_free (&G->emax) ; \
}
#include "LG_internal.h"
int LAGraph_Cached_EMax
(
// input/output:
LAGraph_Graph G, // graph to determine G->emax
char *msg
)
{
//--------------------------------------------------------------------------
// clear msg and check G
//--------------------------------------------------------------------------
LG_CLEAR_MSG_AND_BASIC_ASSERT (G, msg) ;
if (G->emax != NULL)
{
// G->emax already computed
return (GrB_SUCCESS) ;
}
G->emax_state = LAGRAPH_UNKNOWN ;
//--------------------------------------------------------------------------
// determine the type of G->A and the corresponding max monoid
//--------------------------------------------------------------------------
GrB_Type atype = NULL ;
char atype_name [LAGRAPH_MAX_NAME_LEN] ;
atype_name [0] = '\0' ;
LAGraph_Matrix_TypeName (atype_name, G->A, msg) ;
LAGraph_TypeFromName (&atype, atype_name, msg) ;
GrB_Monoid monoid ;
if (atype == GrB_BOOL ) monoid = GrB_LOR_MONOID_BOOL ;
else if (atype == GrB_INT8 ) monoid = GrB_MAX_MONOID_INT8 ;
else if (atype == GrB_INT16 ) monoid = GrB_MAX_MONOID_INT16 ;
else if (atype == GrB_INT32 ) monoid = GrB_MAX_MONOID_INT32 ;
else if (atype == GrB_INT64 ) monoid = GrB_MAX_MONOID_INT64 ;
else if (atype == GrB_UINT8 ) monoid = GrB_MAX_MONOID_UINT8 ;
else if (atype == GrB_UINT16) monoid = GrB_MAX_MONOID_UINT16 ;
else if (atype == GrB_UINT32) monoid = GrB_MAX_MONOID_UINT32 ;
else if (atype == GrB_UINT64) monoid = GrB_MAX_MONOID_UINT64 ;
else if (atype == GrB_FP32 ) monoid = GrB_MAX_MONOID_FP32 ;
else if (atype == GrB_FP64 ) monoid = GrB_MAX_MONOID_FP64 ;
else
{
LG_ASSERT_MSG (false, GrB_NOT_IMPLEMENTED, "type not supported") ;
}
//--------------------------------------------------------------------------
// compute G->emax
//--------------------------------------------------------------------------
GRB_TRY (GrB_Scalar_new (&(G->emax), atype)) ;
GRB_TRY (GrB_reduce (G->emax, NULL, monoid, G->A, NULL)) ;
G->emax_state = LAGraph_VALUE ;
return (GrB_SUCCESS) ;
}