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#include "tools.h"
/* ---------------------------------------------------------------------
*
* -- PBLAS routine (version 1.5) --
* University of Tennessee, Knoxville, Oak Ridge National Laboratory,
* and University of California, Berkeley.
* March 17, 1995
*
* ---------------------------------------------------------------------
*/
void pbchkmat( m, mpos0, n, npos0, ia, ja, desc_A, dpos0, iia, jja,
iarow, iacol, nprow, npcol, myrow, mycol, nra, nca,
info )
/*
* .. Scalar Arguments ..
*/
int dpos0, * iia, * info, ia, * iacol, * iarow, * jja,
ja, m, mpos0, myrow, mycol, npcol, nprow, n, * nca,
npos0, * nra;
/*
* .. Array Arguments ..
*/
int desc_A[];
{
/*
*
* Purpose
* =======
*
* pbmatvect checks the validity of a descriptor vector DESCA, the
* related global indexes IA, JA. It also computes the starting local
* indexes (IIA,JJA) corresponding to the submatrix starting globally at
* the entry pointed by (IA,JA). Moreover, this routine returns the
* coordinates in the grid of the process owning the global matrix entry
* of indexes (IA,JA), namely (IAROW,IACOL). The routine prevents from
* out-of-bound memory access, by performing the adequate MIN operation
* on IIA and JJA. Finally, if an inconsitency is found among its
* parameters ia, ja and desc_A, the routine returns an error code in
* info.
*
* Arguments
* =========
*
* M (global input) INTEGER
* The number or matrix rows of A being operated on.
*
* MPOS0 (global input) INTEGER
* Where in the calling routine's parameter list M appears.
*
* N (global input) INTEGER
* The number or matrix columns of A being operated on.
*
* NPOS0 (global input) INTEGER
* Where in the calling routine's parameter list N appears.
*
* IA (global input) INTEGER
* A's global row index, which points to the beginning of the
* submatrix which is to be operated on.
*
* JA (global input) INTEGER
* A's global column index, which points to the beginning of
* the submatrix which is to be operated on.
*
* DESCA (global and local input) INTEGER array of dimension DLEN_.
* The array descriptor for the distributed matrix A.
*
* DPOS0 (global input) INTEGER
* Where in the calling routine's parameter list DESCA
* appears. Note that we assume IA and JA are respectively 2
* and 1 entries behind DESCA.
*
* IIA (local output) pointer to INTEGER
* The local rows starting index of the submatrix.
*
* JJA (local output) pointer to INTEGER
* The local columns starting index of the submatrix.
*
* IAROW (global output) pointer to INTEGER
* The row coordinate of the process that possesses the first
* row and column of the submatrix.
*
* IACOL (global output) pointer to INTEGER
* The column coordinate of the process that possesses the
* first row and column of the submatrix.
*
* NPROW (global input) INTEGER
* The total number of process rows over which the distributed
* matrix is distributed.
*
* NPCOL (global input) INTEGER
* The total number of process columns over which the
* distributed matrix is distributed.
*
* MYROW (local input) INTEGER
* The row coordinate of the process calling this routine.
*
* MYCOL (local input) INTEGER
* The column coordinate of the process calling this routine.
*
* NRA (local output) pointer to INTEGER
* The maximum between the number of local rows owned by the
* calling process and 1.
*
* NCA (local output) pointer to INTEGER
* The maximum between the number of local columns owned by the
* calling process and 1.
*
* INFO (local input/local output) INTEGER
* = 0: successful exit
* < 0: If the i-th argument is an array and the j-entry had
* an illegal value, then INFO = -(i*100+j), if the i-th
* argument is a scalar and had an illegal value, then
* INFO = -i.
*
* =====================================================================
*
* .. Parameters ..
*/
#define DESCMULT 100
#define BIGNUM 10000
/* ..
* .. Local Scalars ..
*/
int descpos, ExtraColBlock, ExtraRowBlock, iapos, japos,
mpos, MyColBlock, MyColDist, MyRowBlock, MyRowDist,
NColBlock, npos, NRowBlock;
/* ..
* .. External Functions ..
*/
F_INTG_FCT numroc_();
/*
* .. Executable Statements ..
*/
if( *info >= 0 )
*info = BIGNUM;
else if( *info < -DESCMULT )
*info = -(*info);
else
*info = -(*info) * DESCMULT;
/*
* Figure where in parameter list each parameter was, factoring in
* descriptor multiplier
*/
mpos = mpos0 * DESCMULT;
npos = npos0 * DESCMULT;
iapos = ( dpos0 - 2 ) * DESCMULT;
japos = ( dpos0 - 1 ) * DESCMULT;
descpos = dpos0 * DESCMULT + 1;
/*
* Check that we have a legal descriptor type
*/
if(desc_A[DT_] != BLOCK_CYCLIC_2D) *info = MIN( *info, descpos + DT_ );
/*
* Check that matrix values make sense from local viewpoint
*/
if( m < 0 )
*info = MIN( *info, mpos );
if( n < 0 )
*info = MIN( *info, npos );
else if( ia < 1 )
*info = MIN( *info, iapos );
else if( ja < 1 )
*info = MIN( *info, japos );
else if( desc_A[MB_] < 1 )
*info = MIN( *info, descpos + MB_ );
else if( desc_A[NB_] < 1 )
*info = MIN( *info, descpos + NB_ );
else if( ( desc_A[RSRC_] < 0 ) || ( desc_A[RSRC_] >= nprow ) )
*info = MIN( *info, descpos + RSRC_ );
else if( ( desc_A[CSRC_] < 0 ) || ( desc_A[CSRC_] >= npcol ) )
*info = MIN( *info, descpos + CSRC_ );
else if( desc_A[LLD_] < 1 )
*info = MIN( *info, descpos + LLD_ );
if( m == 0 || n == 0 )
{
/*
* NULL matrix, relax some checks
*/
if( desc_A[M_] < 0 )
*info = MIN( *info, descpos + M_ );
if( desc_A[N_] < 0 )
*info = MIN( *info, descpos + N_ );
}
else
{
/*
* more rigorous checks for non-degenerate matrices
*/
if( desc_A[M_] < 1 )
*info = MIN( *info, descpos + M_ );
else if( desc_A[N_] < 1 )
*info = MIN( *info, descpos + N_ );
else
{
if( ia > desc_A[M_] )
*info = MIN( *info, iapos );
else if( ja > desc_A[N_] )
*info = MIN( *info, japos );
else
{
if( ia+m-1 > desc_A[M_] )
*info = MIN( *info, mpos );
if( ja+n-1 > desc_A[N_] )
*info = MIN( *info, npos );
}
}
}
/*
* Retrieve local information for matrix A, and prepare output:
* set info = 0 if no error, and divide by DESCMULT if error is not
* in a descriptor entry.
*/
if( *info == BIGNUM )
{
MyRowDist = ( myrow + nprow - desc_A[RSRC_] ) % nprow;
MyColDist = ( mycol + npcol - desc_A[CSRC_] ) % npcol;
NRowBlock = desc_A[M_] / desc_A[MB_];
NColBlock = desc_A[N_] / desc_A[NB_];
*nra = ( NRowBlock / nprow ) * desc_A[MB_];
*nca = ( NColBlock / npcol ) * desc_A[NB_];
ExtraRowBlock = NRowBlock % nprow;
ExtraColBlock = NColBlock % npcol;
ia--;
ja--;
MyRowBlock = ia / desc_A[MB_];
MyColBlock = ja / desc_A[NB_];
*iarow = ( MyRowBlock + desc_A[RSRC_] ) % nprow;
*iacol = ( MyColBlock + desc_A[CSRC_] ) % npcol;
*iia = ( MyRowBlock / nprow + 1 ) * desc_A[MB_] + 1;
*jja = ( MyColBlock / npcol + 1 ) * desc_A[NB_] + 1;
if( MyRowDist >= ( MyRowBlock % nprow ) )
{
if( myrow == *iarow )
*iia += ia % desc_A[MB_];
*iia -= desc_A[MB_];
}
if( MyRowDist < ExtraRowBlock )
*nra += desc_A[MB_];
else if( MyRowDist == ExtraRowBlock )
*nra += ( desc_A[M_] % desc_A[MB_] );
*nra = MAX( 1, *nra );
if( MyColDist >= ( MyColBlock % npcol ) )
{
if( mycol == *iacol )
*jja += ja % desc_A[NB_];
*jja -= desc_A[NB_];
}
if( MyColDist < ExtraColBlock )
*nca += desc_A[NB_];
else if( MyColDist == ExtraColBlock )
*nca += ( desc_A[N_] % desc_A[NB_] );
*nca = MAX( 1, *nca );
*iia = MIN( *iia, *nra );
*jja = MIN( *jja, *nca );
if( desc_A[LLD_] < *nra )
{
if( numroc_(&desc_A[N_], &desc_A[NB_], &mycol, &desc_A[CSRC_], &npcol) )
*info = -( descpos + LLD_ );
else *info = 0;
}
else
*info = 0;
}
else if( *info % DESCMULT == 0 )
{
*info = -(*info) / DESCMULT;
}
else
{
*info = -(*info);
}
}
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