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#include "tools.h"
void pdatrmv_(uplo, trans, diag, N, alpha, A, IA, JA, descA, X, IX, JX, descX,
incX, beta, Y, IY, JY, descY, incY)
F_CHAR uplo;
F_CHAR trans;
F_CHAR diag;
int *N;
double *alpha;
double *A;
int *IA;
int *JA;
int *descA;
double *X;
int *IX;
int *JX;
int *descX;
int *incX;
double *beta;
double *Y;
int *IY;
int *JY;
int *descY;
int *incY;
/*
* Purpose
* =======
*
* PDATRMV performs the distributed matrix-vector operations
*
* sub( Y ) := alpha*sub( abs(A) ) * sub( abs(X) ) + beta*sub( abs(Y) )
*
* where op may be transpose or conjugate transpose, and
*
* sub( A ) denotes A(IA:IA+M-1,JA:JA+N-1),
*
* sub (X ) denotes
* X(IX:IX,JX:JX+N-1), if INX = M_X
* X(IX:IX+N-1,JX:JX), if INCX = 1 and INCX <> M_X,
*
* sub( Y ) denotes
* Y(IY:IY,JY:JY+M-1), if INCY = M_Y,
* Y(IY:IY+M-1,JY:JY), if INCY = 1 and INCY <> M_Y,
*
* alpha and beta are scalars, and sub( X ) and sub( Y ) are distributed
* vectors and sub( A ) is a M-by-N distributed submatrix.
*
* Notes
* =====
* A description vector is associated with each 2D block-cyclicly dis-
* tributed matrix. This vector stores the information required to
* establish the mapping between a matrix entry and its corresponding
* process and memory location.
*
* In the following comments, the character _ should be read as
* "of the distributed matrix". Let A be a generic term for any 2D
* block cyclicly distributed matrix. Its description vector is DESC_A:
*
* NOTATION STORED IN EXPLANATION
* --------------- ------------- ---------------------------------------
* M_A (global) desc_A[M_] The number of rows in the distributed
* matrix.
* N_A (global) desc_A[N_] The number of columns in the distribu-
* ted matrix.
* MB_A (global) desc_A[MB_] The blocking factor used to distribute
* the rows of the matrix.
* NB_A (global) desc_A[NB_] The blocking factor used to distribute
* the columns of the matrix.
* RSRC_A (global) desc_A[RSRC_] The process row over which the first
* row of the matrix is distributed.
* CSRC_A (global) desc_A[CSRC_] The process column over which the first
* column of the matrix is distributed.
* CTXT_A (global) desc_A[CTXT_] The BLACS context handle, indicating
* the global context of the operation on
* the matrix. The context is global, but the
* context handle may vary across processes.
* LLD_A (local) desc_A[LLD_] The leading dimension of the local
* array storing the local blocks of the
* distributed matrix A.
* LLD_A >= MAX(1,LOCp(M_A)).
*
* Let K be the number of rows or columns of a distributed matrix,
* and assume that its process grid has dimension p x q.
* LOCp( K ) denotes the number of elements of K that a process
* would receive if K were distributed over the p processes of its
* process column.
* Similarly, LOCq( K ) denotes the number of elements of K that a
* process would receive if K were distributed over the q processes of
* its process row.
* The values of LOCp() and LOCq() may be determined via a call to the
* ScaLAPACK tool function, NUMROC.
* LOCp( M ) = NUMROC( M, MB_A, MYROW, RSRC_A, NPROW ),
* LOCq( N ) = NUMROC( N, NB_A, MYCOL, CSRC_A, NPCOL ).
*
* Because vectors are a subclass of matrices, a distributed vector is
* considered to be a distributed matrix.
*
* Parameters
* ==========
*
* N (global input) pointer to DOUBLE PRECISION.
* The length of the distributed vectors to be operated on. N >= 0.
*
* TRANS (global input) pointer to CHARACTER
* On entry, TRANS specifies what op( ) indicates as follows:
*
* if TRANS = 'N' or 'n',
* op( A ) = A
* else if TRANS = 'T' or 't',
* op( A ) = A'
* else if TRANS = 'C' or 'c',
* op( A ) = A'
* M (global input) pointer to INTEGER
* The number of rows to be operated on; i.e the number of rows
* of the distributed submatrix sub( A ). M >= 0.
*
* N (global input) pointer to INTEGER
* The number of columns to be operated on; i.e the number of
* columns of the distributed submatrix sub( A ). N >= 0.
*
* ALPHA (global input) pointer to DOUBLE PRECISION
* On entry, ALPHA specifies the scalar alpha.
*
* X (local input) DOUBLE PRECISION array containing the local pieces
* of a distributed matrix of dimension of at least
* ( (JX-1)*M_X + IX + ( N - 1 )*abs( INCX ) )
* This array contains the entries of the distributed vector
* sub( X ).
*
* IX (global input) pointer to INTEGER
* The global row index of the distributed matrix X which points
* to the first row of the submatrix to operated on.
*
* JX (global input) pointer to INTEGER
* The global column index of the distributed matrix X which points
* to the first column of the submatrix to operated on.
*
* DESCX (global and local input) INTEGER array of dimension 8.
* The array descriptor of the distributed matrix X.
*
* INCX (global input) pointer to INTEGER
* The global increment for the elements of X. Only two values
* of INCX are supported in this version, namely 1 and M_X.
*
* Y (local input) DOUBLE PRECISION array containing the local pieces
* of a distributed matrix of dimension of at least
* ( (JY-1)*M_Y + IY + ( N - 1 )*abs( INCY ) )
* This array contains the entries of the distributed vector
* sub( Y ).
*
* IY (global input) pointer to INTEGER
* The global row index of the distributed matrix Y which points
* to the first row of the submatrix to operated on.
*
* JY (global input) pointer to INTEGER
* The global column index of the distributed matrix Y which points
* to the first column of the submatrix to operated on.
*
* DESCY (global and local input) INTEGER array of dimension 8.
* The array descriptor of the distributed matrix Y.
*
* INCY (global input) pointer to INTEGER
* The global increment for the elements of Y. Only two values
* of INCY are supported in this version, namely 1 and M_Y.
*
* A (local input) DOUBLE PRECISION pointer into local memory to an array
* of dimension ( LLD_A, LOCq(JA+N-1) ) containing the local pieces
* of the distributed matrix sub( A )
*
* IA (global input) pointer to INTEGER
* The global row index of the distributed matrix A which points
* to the first row of the submatrix to operated on.
*
* JA (global input) pointer to INTEGER
* The global column index of the distributed matrix A which points
* to the first column of the submatrix to operated on.
*
* DESCA (global and local input) INTEGER array of dimension 8.
* The array descriptor of the distributed matrix A.
*
* ===========================================================================
*/
{
/*
* .. External routines ..
*/
void pberror_();
void CpdatrmvLN();
void CpdatrmvLT();
void CpdatrmvUN();
void CpdatrmvUT();
char Cuplo, Cdiag, Ctrans;
int nprow, npcol, myrow, mycol, UNIT, info=0;
Cblacs_gridinfo(descA[CTXT_], &nprow, &npcol, &myrow, &mycol);
Cuplo = *F2C_CHAR(uplo);
Cuplo = Mlowcase(Cuplo);
Cdiag = *F2C_CHAR(diag);
Cdiag = Mlowcase(Cdiag);
Ctrans = *F2C_CHAR(trans);
Ctrans = Mlowcase(Ctrans);
pchkmat(*N, 4, *N, 4, *IA, *JA, descA, 9, &info, nprow, npcol, myrow, mycol);
pchkvec(*N, 4, *IX, *JX, descX, *incX, 13, &info, nprow, npcol,
myrow, mycol);
pchkvec(*N, 4, *IY, *JY, descY, *incY, 19, &info, nprow, npcol,
myrow, mycol);
if (descA[CTXT_] != descX[CTXT_])
{
if (info == 0) info = -(1300+CTXT_+1);
}
else if (descX[CTXT_] != descY[CTXT_])
{
if (info == 0) info = -(1900+CTXT_+1);
}
else if (descA[MB_] != descA[NB_]) /* enforce square blocks */
{
if (info == 0) info = -(900+NB_+1);
}
else if ((*IA-1) % descA[MB_] != (*JA-1) % descA[NB_])
{
fprintf(stderr, "ERROR: IA=%d, JA=%d, descA[MB_]=%d, descA[NB]=%d\n",
*IA-1, *JA-1, descA[MB_], descA[NB_]);
if (info == 0) info = -8;
}
if (Cdiag == 'u') UNIT = 1;
else if (Cdiag == 'n') UNIT = 0;
else info = -3;
if (info)
{
pberror_(&descA[CTXT_], "PDATRMV", &info);
return;
}
/*
* Quick return, if possible
*/
if ( (*N == 0) || ((*alpha == 0.0) && (*beta == 1.0)) ) return;
if (Cuplo == 'l')
{
if (Ctrans == 'n')
CpdatrmvLN(UNIT, *N, *alpha, A, *IA-1, *JA-1, descA, X, *IX-1, *JX-1,
descX, *incX, *beta, Y, *IY-1, *JY-1, descY, *incY);
else if ( (Ctrans == 't') || (Ctrans == 'c') )
CpdatrmvLT(UNIT, *N, *alpha, A, *IA-1, *JA-1, descA, X, *IX-1, *JX-1,
descX, *incX, *beta, Y, *IY-1, *JY-1, descY, *incY);
else
{
info = -2;
pberror_(&descA[CTXT_], "PDATRMV", &info);
}
}
else if (Cuplo == 'u')
{
if (Ctrans == 'n')
CpdatrmvUN(UNIT, *N, *alpha, A, *IA-1, *JA-1, descA, X, *IX-1, *JX-1,
descX, *incX, *beta, Y, *IY-1, *JY-1, descY, *incY);
else if ( (Ctrans == 't') || (Ctrans == 'c') )
CpdatrmvUT(UNIT, *N, *alpha, A, *IA-1, *JA-1, descA, X, *IX-1, *JX-1,
descX, *incX, *beta, Y, *IY-1, *JY-1, descY, *incY);
else
{
info = -2;
pberror_(&descA[CTXT_], "PDATRMV", &info);
}
}
else
{
info = -1;
pberror_(&descA[CTXT_], "PDATRMV", &info);
}
}
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