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/*
-- MAGMA (version 2.9.0) --
Univ. of Tennessee, Knoxville
Univ. of California, Berkeley
Univ. of Colorado, Denver
@date January 2025
@generated from sparse/control/magma_zparilu_kernels.cpp, normal z -> s, Wed Jan 22 14:42:32 2025
@author Hartwig Anzt
*/
#include "magmasparse_internal.h"
#ifdef _OPENMP
#include <omp.h>
#endif
#define SWAP(a, b) { val_swap = a; a = b; b = val_swap; }
/***************************************************************************//**
Purpose
-------
This function does one asynchronous ParILU sweep.
Input and output array are identical.
Arguments
---------
@param[in]
A magma_s_matrix
System matrix in COO.
@param[in]
L magma_s_matrix*
Current approximation for the lower triangular factor
The format is sorted CSR.
@param[in]
U magma_s_matrix*
Current approximation for the upper triangular factor
The format is sorted CSC (U^T in CSR).
@param[in]
queue magma_queue_t
Queue to execute in.
@ingroup magmasparse_saux
*******************************************************************************/
extern "C" magma_int_t
magma_sparilu_sweep(
magma_s_matrix A,
magma_s_matrix *L,
magma_s_matrix *U,
magma_queue_t queue )
{
magma_int_t info = 0;
int i, j;
float zero = MAGMA_S_MAKE(0.0, 0.0);
int il, iu, jl, ju;
#pragma omp parallel for
for (int k=0; k < A.nnz; k++) {
i = A.rowidx[k];
j = A.col[k];
float s, sp;
s = A.val[k];
sp = zero;
il = L->row[i];
iu = U->row[j];
while (il < L->row[i+1] && iu < U->row[j+1])
{
sp = zero;
jl = L->col[il];
ju = U->col[iu];
// avoid branching
sp = ( jl == ju ) ? L->val[il] * U->val[iu] : sp;
s = ( jl == ju ) ? s-sp : s;
il = ( jl <= ju ) ? il+1 : il;
iu = ( jl >= ju ) ? iu+1 : iu;
}
// undo the last operation (it must be the last)
s += sp;
if ( i > j ) // modify l entry
L->val[il-1] = s / U->val[U->row[j+1]-1];
else { // modify u entry
U->val[iu-1] = s;
}
}
return info;
}
/***************************************************************************//**
Purpose
-------
This function does one synchronized ParILU sweep. Input and output are
different arrays.
Arguments
---------
@param[in]
A magma_s_matrix
System matrix in COO.
@param[in]
L magma_s_matrix*
Current approximation for the lower triangular factor
The format is sorted CSR.
@param[in]
U magma_s_matrix*
Current approximation for the upper triangular factor
The format is sorted CSC (U^T in CSR).
@param[in]
queue magma_queue_t
Queue to execute in.
@ingroup magmasparse_saux
*******************************************************************************/
extern "C" magma_int_t
magma_sparilu_sweep_sync(
magma_s_matrix A,
magma_s_matrix *L,
magma_s_matrix *U,
magma_queue_t queue )
{
magma_int_t info = 0;
int i, j;
float zero = MAGMA_S_MAKE(0.0, 0.0);
int il, iu, jl, ju;
float *L_new_val = NULL, *U_new_val = NULL, *val_swap = NULL;
CHECK( magma_smalloc_cpu( &L_new_val, L->nnz ));
CHECK( magma_smalloc_cpu( &U_new_val, U->nnz ));
// we need 1 on the main diagonal of L
#pragma omp parallel for
for (int k=0; k < L->num_rows; k++) {
L_new_val[L->row[k+1]-1] = MAGMA_S_ONE;
}
#pragma omp parallel for
for (int k=0; k < A.nnz; k++) {
i = A.rowidx[k];
j = A.col[k];
float s, sp;
s = A.val[k];
sp = zero;
il = L->row[i];
iu = U->row[j];
while (il < L->row[i+1] && iu < U->row[j+1])
{
sp = zero;
jl = L->col[il];
ju = U->col[iu];
// avoid branching
sp = ( jl == ju ) ? L->val[il] * U->val[iu] : sp;
s = ( jl == ju ) ? s-sp : s;
il = ( jl <= ju ) ? il+1 : il;
iu = ( jl >= ju ) ? iu+1 : iu;
}
// undo the last operation (it must be the last)
s += sp;
if ( i > j ) // modify l entry
L_new_val[il-1] = s / U->val[U->row[j+1]-1];
else { // modify u entry
U_new_val[iu-1] = s;
}
}
// swap old and new values
SWAP( L_new_val, L->val );
SWAP( U_new_val, U->val );
cleanup:
magma_free_cpu( L_new_val );
magma_free_cpu( U_new_val );
return info;
}
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