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/**
*
* @file z_spm_matrixvector.c
*
* PaStiX csc routines
* PaStiX is a software package provided by Inria Bordeaux - Sud-Ouest,
* LaBRI, University of Bordeaux 1 and IPB.
*
* @version 5.1.0
* @author Mathieu Faverge
* @author Theophile Terraz
* @date 2015-01-01
*
* @precisions normal z -> c d s
**/
#include "common.h"
#include "csc.h"
#include "z_spm.h"
/**
*******************************************************************************
*
* @ingroup pastix_csc
*
* z_spmGeCSCv - compute the matrix-vector product:
* y = alpha * op( A ) + beta * y
*
* A is a PastixGeneral csc, where op( X ) is one of
*
* op( X ) = X or op( X ) = X' or op( X ) = conjg( X' )
*
* alpha and beta are scalars, and x and y are vectors.
*
*******************************************************************************
*
* @param[in] trans
* Specifies whether the matrix spm is transposed, not transposed or
* conjugate transposed:
* = PastixNoTrans: A is not transposed;
* = PastixTrans: A is transposed;
* = PastixConjTrans: A is conjugate transposed.
*
* @param[in] alpha
* alpha specifies the scalar alpha
*
* @param[in] csc
* The PastixGeneral csc.
*
* @param[in] x
* The vector x.
*
* @param[in] beta
* beta specifies the scalar beta
*
* @param[in,out] y
* The vector y.
*
*******************************************************************************
*
* @return
* \retval PASTIX_SUCCESS if the y vector has been computed succesfully,
* \retval PASTIX_ERR_BADPARAMETER otherwise.
*
*******************************************************************************/
int
z_spmGeCSCv( int trans,
pastix_complex64_t alpha,
const pastix_csc_t *csc,
const pastix_complex64_t *x,
pastix_complex64_t beta,
pastix_complex64_t *y )
{
const pastix_complex64_t *valptr = (pastix_complex64_t*)csc->values;
const pastix_complex64_t *xptr = x;
pastix_complex64_t *yptr = y;
pastix_int_t col, row, i, baseval;
if ( (csc == NULL) || (x == NULL) || (y == NULL ) )
{
return PASTIX_ERR_BADPARAMETER;
}
if( csc->mtxtype != PastixGeneral )
{
return PASTIX_ERR_BADPARAMETER;
}
baseval = spmFindBase( csc );
/* first, y = beta*y */
if( beta == 0. ) {
memset( yptr, 0, csc->gN * sizeof(pastix_complex64_t) );
}
else {
for( i=0; i<csc->gN; i++, yptr++ ) {
(*yptr) *= beta;
}
yptr = y;
}
if( alpha != 0. ) {
/**
* PastixNoTrans
*/
if( trans == PastixNoTrans )
{
for( col=0; col < csc->gN; col++ )
{
for( i=csc->colptr[col]; i<csc->colptr[col+1]; i++ )
{
row = csc->rowptr[i-baseval]-baseval;
yptr[row] += alpha * valptr[i-baseval] * xptr[col];
}
}
}
/**
* PastixTrans
*/
else if( trans == PastixTrans )
{
for( col=0; col < csc->gN; col++ )
{
for( i=csc->colptr[col]; i<csc->colptr[col+1]; i++ )
{
row = csc->rowptr[i-baseval]-baseval;
yptr[col] += alpha * valptr[i-baseval] * xptr[row];
}
}
}
#if defined(PRECISION_c) || defined(PRECISION_z)
else if( trans == PastixConjTrans )
{
for( col=0; col < csc->gN; col++ )
{
for( i=csc->colptr[col]; i<csc->colptr[col+1]; i++ )
{
row = csc->rowptr[i-baseval]-baseval;
yptr[col] += alpha * conj( valptr[i-baseval] ) * xptr[row];
}
}
}
#endif
else
{
return PASTIX_ERR_BADPARAMETER;
}
}
return PASTIX_SUCCESS;
}
/**
*******************************************************************************
*
* @ingroup pastix_csc
*
* z_spmSYCSCv - compute the matrix-vector product:
* y = alpha * A + beta * y
*
* A is a PastixSymmetric csc, alpha and beta are scalars, and x and y are
* vectors, and A a symm.
*
*******************************************************************************
*
* @param[in] alpha
* alpha specifies the scalar alpha
*
* @param[in] csc
* The PastixSymmetric csc.
*
* @param[in] x
* The vector x.
*
* @param[in] beta
* beta specifies the scalar beta
*
* @param[in,out] y
* The vector y.
*
*******************************************************************************
*
* @return
* \retval PASTIX_SUCCESS if the y vector has been computed succesfully,
* \retval PASTIX_ERR_BADPARAMETER otherwise.
*
*******************************************************************************/
int
z_spmSyCSCv( pastix_complex64_t alpha,
const pastix_csc_t *csc,
const pastix_complex64_t *x,
pastix_complex64_t beta,
pastix_complex64_t *y )
{
const pastix_complex64_t *valptr = (pastix_complex64_t*)csc->values;
const pastix_complex64_t *xptr = x;
pastix_complex64_t *yptr = y;
pastix_int_t col, row, i, baseval;
if ( (csc == NULL) || (x == NULL) || (y == NULL ) )
{
return PASTIX_ERR_BADPARAMETER;
}
if( csc->mtxtype != PastixSymmetric )
{
return PASTIX_ERR_BADPARAMETER;
}
baseval = spmFindBase( csc );
/* First, y = beta*y */
if( beta == 0. ) {
memset( yptr, 0, csc->gN * sizeof(pastix_complex64_t) );
}
else {
for( i=0; i<csc->gN; i++, yptr++ ) {
(*yptr) *= beta;
}
yptr = y;
}
if( alpha != 0. ) {
for( col=0; col < csc->gN; col++ )
{
for( i=csc->colptr[col]; i < csc->colptr[col+1]; i++ )
{
row = csc->rowptr[i-baseval]-baseval;
yptr[row] += alpha * valptr[i-baseval] * xptr[col];
if( col != row )
{
yptr[col] += alpha * valptr[i-baseval] * xptr[row];
}
}
}
}
return PASTIX_SUCCESS;
}
#if defined(PRECISION_c) || defined(PRECISION_z)
/**
*******************************************************************************
*
* @ingroup pastix_csc
*
* z_spmHeCSCv - compute the matrix-vector product:
* y = alpha * A + beta * y
*
* A is a PastixHermitian csc, alpha and beta are scalars, and x and y are
* vectors, and A a symm.
*
*******************************************************************************
*
* @param[in] alpha
* alpha specifies the scalar alpha
*
* @param[in] csc
* The PastixHermitian csc.
*
* @param[in] x
* The vector x.
*
* @param[in] beta
* beta specifies the scalar beta
*
* @param[in,out] y
* The vector y.
*
*******************************************************************************
*
* @return
* \retval PASTIX_SUCCESS if the y vector has been computed succesfully,
* \retval PASTIX_ERR_BADPARAMETER otherwise.
*
*******************************************************************************/
int
z_spmHeCSCv( pastix_complex64_t alpha,
const pastix_csc_t *csc,
const pastix_complex64_t *x,
pastix_complex64_t beta,
pastix_complex64_t *y )
{
const pastix_complex64_t *valptr = (pastix_complex64_t*)csc->values;
const pastix_complex64_t *xptr = x;
pastix_complex64_t *yptr = y;
pastix_int_t col, row, i, baseval;
if ( (csc == NULL) || (x == NULL) || (y == NULL ) )
{
return PASTIX_ERR_BADPARAMETER;
}
if( csc->mtxtype != PastixHermitian )
{
return PASTIX_ERR_BADPARAMETER;
}
/* First, y = beta*y */
if( beta == 0. ) {
memset( yptr, 0, csc->gN * sizeof(pastix_complex64_t) );
}
else {
for( i=0; i<csc->gN; i++, yptr++ ) {
(*yptr) *= beta;
}
yptr = y;
}
baseval = spmFindBase( csc );
if( alpha != 0. ) {
for( col=0; col < csc->gN; col++ )
{
for( i=csc->colptr[col]; i < csc->colptr[col+1]; i++ )
{
row=csc->rowptr[i-baseval]-baseval;
yptr[row] += alpha * valptr[i-baseval] * xptr[col];
if( col != row )
yptr[col] += alpha * conj( valptr[i-baseval] ) * xptr[row];
}
}
}
return PASTIX_SUCCESS;
}
#endif