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28 *****************************************************************************
29 * Contents: Native middle-level C interface to LAPACK function zbbcsd
30 * Author: Intel Corporation
31 *****************************************************************************/
32 
33 #include "lapacke_utils.h"
34 
LAPACKE_zbbcsd_work(int matrix_layout,char jobu1,char jobu2,char jobv1t,char jobv2t,char trans,lapack_int m,lapack_int p,lapack_int q,double * theta,double * phi,lapack_complex_double * u1,lapack_int ldu1,lapack_complex_double * u2,lapack_int ldu2,lapack_complex_double * v1t,lapack_int ldv1t,lapack_complex_double * v2t,lapack_int ldv2t,double * b11d,double * b11e,double * b12d,double * b12e,double * b21d,double * b21e,double * b22d,double * b22e,double * rwork,lapack_int lrwork)35 lapack_int LAPACKE_zbbcsd_work( int matrix_layout, char jobu1, char jobu2,
36                                 char jobv1t, char jobv2t, char trans,
37                                 lapack_int m, lapack_int p, lapack_int q,
38                                 double* theta, double* phi,
39                                 lapack_complex_double* u1, lapack_int ldu1,
40                                 lapack_complex_double* u2, lapack_int ldu2,
41                                 lapack_complex_double* v1t, lapack_int ldv1t,
42                                 lapack_complex_double* v2t, lapack_int ldv2t,
43                                 double* b11d, double* b11e, double* b12d,
44                                 double* b12e, double* b21d, double* b21e,
45                                 double* b22d, double* b22e, double* rwork,
46                                 lapack_int lrwork )
47 {
48     lapack_int info = 0;
49     /* LAPACK function works with matrices in both layouts. It is supported
50      * through TRANS parameter. So all conversion between layouts can be
51      * completed in LAPACK function. See the table below which describes how
52      * every LAPACKE call is forwarded to corresponding LAPACK call.
53      *
54      *   matrix_layout    | trans_LAPACKE | -> trans_LAPACK
55      *                    |   (trans)     |       (ltrans)
56      *   -----------------+---------------+----------------
57      *   LAPACK_COL_MAJOR |     'N'       | ->     'N'
58      *   LAPACK_COL_MAJOR |     'T'       | ->     'T'
59      *   LAPACK_ROW_MAJOR |     'N'       | ->     'T'
60      *   LAPACK_ROW_MAJOR |     'T'       | ->     'T'
61      *       (note that for row major layout trans parameter is ignored)
62      */
63     if( matrix_layout == LAPACK_COL_MAJOR ||
64         matrix_layout == LAPACK_ROW_MAJOR ) {
65         char ltrans;
66         if( !LAPACKE_lsame( trans, 't' ) && matrix_layout == LAPACK_COL_MAJOR ) {
67             ltrans = 'n';
68         } else {
69             ltrans = 't';
70         }
71         /* Call LAPACK function and adjust info */
72         LAPACK_zbbcsd( &jobu1, &jobu2, &jobv1t, &jobv2t, &ltrans, &m, &p, &q,
73                        theta, phi, u1, &ldu1, u2, &ldu2, v1t, &ldv1t, v2t,
74                        &ldv2t, b11d, b11e, b12d, b12e, b21d, b21e, b22d, b22e,
75                        rwork, &lrwork, &info );
76         if( info < 0 ) {
77             info = info - 1;
78         }
79     } else {
80         info = -1;
81         LAPACKE_xerbla( "LAPACKE_zbbcsd_work", info );
82     }
83     return info;
84 }
85