lapacke_dgelsd_work.c

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* Contents: Native middle-level C interface to LAPACK function dgelsd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dgelsd_work( int matrix_layout, lapack_int m, lapack_int n,
                                lapack_int nrhs, double* a, lapack_int lda,
                                double* b, lapack_int ldb, double* s,
                                double rcond, lapack_int* rank, double* work,
                                lapack_int lwork, lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dgelsd( &m, &n, &nrhs, a, &lda, b, &ldb, s, &rcond, rank, work,
                       &lwork, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,m);
        lapack_int ldb_t = MAX(1,MAX(m,n));
        double* a_t = NULL;
        double* b_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -6;
            LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
            return info;
        }
        if( ldb < nrhs ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_dgelsd( &m, &n, &nrhs, a, &lda_t, b, &ldb_t, s, &rcond, rank,
                           work, &lwork, iwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,nrhs) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
        LAPACKE_dge_trans( matrix_layout, MAX(m,n), nrhs, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dgelsd( &m, &n, &nrhs, a_t, &lda_t, b_t, &ldb_t, s, &rcond, rank,
                       work, &lwork, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, MAX(m,n), nrhs, b_t, ldb_t, b,
                           ldb );
        /* Release memory and exit */
        LAPACKE_free( b_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dgelsd_work", info );
    }
    return info;
}