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*****************************************************************************
* Contents: Native middle-level C interface to LAPACK function sggsvd3
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_sggsvd3_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,
                                 float* a, lapack_int lda, float* b,
                                 lapack_int ldb, float* alpha, float* beta,
                                 float* u, lapack_int ldu, float* v,
                                 lapack_int ldv, float* q, lapack_int ldq,
                                 float* work, lapack_int lwork,
                                 lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sggsvd3( &jobu, &jobv, &jobq, &m, &n, &p, k, l, a, &lda,
                        b, &ldb, alpha, beta, u, &ldu, v, &ldv, q, &ldq,
                        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,p);
        lapack_int ldq_t = MAX(1,n);
        lapack_int ldu_t = MAX(1,m);
        lapack_int ldv_t = MAX(1,p);
        float* a_t = NULL;
        float* b_t = NULL;
        float* u_t = NULL;
        float* v_t = NULL;
        float* q_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_sggsvd3_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -13;
            LAPACKE_xerbla( "LAPACKE_sggsvd3_work", info );
            return info;
        }
        if( ldq < n ) {
            info = -21;
            LAPACKE_xerbla( "LAPACKE_sggsvd3_work", info );
            return info;
        }
        if( ldu < m ) {
            info = -17;
            LAPACKE_xerbla( "LAPACKE_sggsvd3_work", info );
            return info;
        }
        if( ldv < p ) {
            info = -19;
            LAPACKE_xerbla( "LAPACKE_sggsvd3_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
          LAPACK_sggsvd3( &jobu, &jobv, &jobq, &m, &n, &p, k, l, a, &lda_t,
                          b, &ldb_t, alpha, beta, u, &ldu_t, v, &ldv_t,
                          q, &ldq_t, work, &lwork, iwork, &info );
          return (info < 0) ? (info - 1) : info;
        }

        /* Allocate memory for temporary array(s) */
        a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        b_t = (float*)LAPACKE_malloc( sizeof(float) * 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 = (float*)LAPACKE_malloc( sizeof(float) * 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 = (float*)LAPACKE_malloc( sizeof(float) * 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 = (float*)LAPACKE_malloc( sizeof(float) * ldq_t * MAX(1,n) );
            if( q_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_4;
            }
        }
        /* Transpose input matrices */
        LAPACKE_sge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
        LAPACKE_sge_trans( matrix_layout, p, n, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_sggsvd3( &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, &lwork, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, p, n, b_t, ldb_t, b, ldb );
        if( LAPACKE_lsame( jobu, 'u' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, m, u_t, ldu_t, u, ldu );
        }
        if( LAPACKE_lsame( jobv, 'v' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, p, p, v_t, ldv_t, v, ldv );
        }
        if( LAPACKE_lsame( jobq, 'q' ) ) {
            LAPACKE_sge_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_sggsvd3_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sggsvd3_work", info );
    }
    return info;
}
