lapacke_dggsvd_work.c

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* Contents: Native middle-level C interface to LAPACK function dggsvd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dggsvd_work( int matrix_layout, char jobu, char jobv,
                                char jobq, lapack_int m, lapack_int n,
                                lapack_int p, lapack_int* k, lapack_int* l,
                                double* a, lapack_int lda, double* b,
                                lapack_int ldb, double* alpha, double* beta,
                                double* u, lapack_int ldu, double* v,
                                lapack_int ldv, double* q, lapack_int ldq,
                                double* work, lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dggsvd( &jobu, &jobv, &jobq, &m, &n, &p, k, l, a, &lda, b, &ldb,
                       alpha, beta, u, &ldu, v, &ldv, q, &ldq, work, 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,p);
        lapack_int ldq_t = MAX(1,n);
        lapack_int ldu_t = MAX(1,m);
        lapack_int ldv_t = MAX(1,p);
        double* a_t = NULL;
        double* b_t = NULL;
        double* u_t = NULL;
        double* v_t = NULL;
        double* q_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_dggsvd_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -13;
            LAPACKE_xerbla( "LAPACKE_dggsvd_work", info );
            return info;
        }
        if( ldq < n ) {
            info = -21;
            LAPACKE_xerbla( "LAPACKE_dggsvd_work", info );
            return info;
        }
        if( ldu < m ) {
            info = -17;
            LAPACKE_xerbla( "LAPACKE_dggsvd_work", info );
            return info;
        }
        if( ldv < p ) {
            info = -19;
            LAPACKE_xerbla( "LAPACKE_dggsvd_work", info );
            return 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,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        if( LAPACKE_lsame( jobu, 'u' ) ) {
            u_t = (double*)LAPACKE_malloc( sizeof(double) * ldu_t * MAX(1,m) );
            if( u_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        if( LAPACKE_lsame( jobv, 'v' ) ) {
            v_t = (double*)LAPACKE_malloc( sizeof(double) * ldv_t * MAX(1,p) );
            if( v_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_3;
            }
        }
        if( LAPACKE_lsame( jobq, 'q' ) ) {
            q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
            if( q_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_4;
            }
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
        LAPACKE_dge_trans( matrix_layout, p, n, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dggsvd( &jobu, &jobv, &jobq, &m, &n, &p, k, l, a_t, &lda_t, b_t,
                       &ldb_t, alpha, beta, u_t, &ldu_t, v_t, &ldv_t, q_t,
                       &ldq_t, work, 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, p, n, b_t, ldb_t, b, ldb );
        if( LAPACKE_lsame( jobu, 'u' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, m, u_t, ldu_t, u, ldu );
        }
        if( LAPACKE_lsame( jobv, 'v' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, p, p, v_t, ldv_t, v, ldv );
        }
        if( LAPACKE_lsame( jobq, 'q' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobq, 'q' ) ) {
            LAPACKE_free( q_t );
        }
exit_level_4:
        if( LAPACKE_lsame( jobv, 'v' ) ) {
            LAPACKE_free( v_t );
        }
exit_level_3:
        if( LAPACKE_lsame( jobu, 'u' ) ) {
            LAPACKE_free( u_t );
        }
exit_level_2:
        LAPACKE_free( b_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dggsvd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dggsvd_work", info );
    }
    return info;
}