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//------------------------------------------------------------------------------
// GB_iso_check_template: check if all entries in a matrix are identical
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
{
//--------------------------------------------------------------------------
// get A
//--------------------------------------------------------------------------
const GB_ATYPE *restrict Ax = (GB_ATYPE *) A->x ;
//--------------------------------------------------------------------------
// check all entries to see if they are equal to the first entry
//--------------------------------------------------------------------------
int tid ;
#pragma omp parallel for num_threads(nthreads) schedule(dynamic,1)
for (tid = 0 ; tid < ntasks ; tid++)
{
int64_t pstart, pend ;
GB_PARTITION (pstart, pend, anz, tid, ntasks) ;
bool my_iso ;
GB_ATOMIC_READ
my_iso = iso ;
if (my_iso)
{
// GB_ATYPE a = Ax [0] ;
GB_GET_FIRST_VALUE (GB_ATYPE, a, Ax) ;
for (int64_t p = pstart ; my_iso && p < pend ; p++)
{
// my_iso = my_iso && (a == Ax [p])
GB_COMPARE_WITH_FIRST_VALUE (my_iso, a, Ax, p) ;
}
if (!my_iso)
{
// tell the other tasks to exit early
GB_ATOMIC_WRITE
iso = false ;
}
}
}
done = true ;
}
#undef GB_ATYPE
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