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28 *****************************************************************************
29 * Contents: Native middle-level C interface to LAPACK function chbgvx
30 * Author: Intel Corporation
31 *****************************************************************************/
32 
33 #include "lapacke_utils.h"
34 
LAPACKE_chbgvx_work(int matrix_layout,char jobz,char range,char uplo,lapack_int n,lapack_int ka,lapack_int kb,lapack_complex_float * ab,lapack_int ldab,lapack_complex_float * bb,lapack_int ldbb,lapack_complex_float * q,lapack_int ldq,float vl,float vu,lapack_int il,lapack_int iu,float abstol,lapack_int * m,float * w,lapack_complex_float * z,lapack_int ldz,lapack_complex_float * work,float * rwork,lapack_int * iwork,lapack_int * ifail)35 lapack_int LAPACKE_chbgvx_work( int matrix_layout, char jobz, char range,
36                                 char uplo, lapack_int n, lapack_int ka,
37                                 lapack_int kb, lapack_complex_float* ab,
38                                 lapack_int ldab, lapack_complex_float* bb,
39                                 lapack_int ldbb, lapack_complex_float* q,
40                                 lapack_int ldq, float vl, float vu,
41                                 lapack_int il, lapack_int iu, float abstol,
42                                 lapack_int* m, float* w,
43                                 lapack_complex_float* z, lapack_int ldz,
44                                 lapack_complex_float* work, float* rwork,
45                                 lapack_int* iwork, lapack_int* ifail )
46 {
47     lapack_int info = 0;
48     if( matrix_layout == LAPACK_COL_MAJOR ) {
49         /* Call LAPACK function and adjust info */
50         LAPACK_chbgvx( &jobz, &range, &uplo, &n, &ka, &kb, ab, &ldab, bb, &ldbb,
51                        q, &ldq, &vl, &vu, &il, &iu, &abstol, m, w, z, &ldz,
52                        work, rwork, iwork, ifail, &info );
53         if( info < 0 ) {
54             info = info - 1;
55         }
56     } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
57         lapack_int ldab_t = MAX(1,ka+1);
58         lapack_int ldbb_t = MAX(1,kb+1);
59         lapack_int ldq_t = MAX(1,n);
60         lapack_int ldz_t = MAX(1,n);
61         lapack_complex_float* ab_t = NULL;
62         lapack_complex_float* bb_t = NULL;
63         lapack_complex_float* q_t = NULL;
64         lapack_complex_float* z_t = NULL;
65         /* Check leading dimension(s) */
66         if( ldab < n ) {
67             info = -9;
68             LAPACKE_xerbla( "LAPACKE_chbgvx_work", info );
69             return info;
70         }
71         if( ldbb < n ) {
72             info = -11;
73             LAPACKE_xerbla( "LAPACKE_chbgvx_work", info );
74             return info;
75         }
76         if( ldq < n ) {
77             info = -13;
78             LAPACKE_xerbla( "LAPACKE_chbgvx_work", info );
79             return info;
80         }
81         if( ldz < n ) {
82             info = -22;
83             LAPACKE_xerbla( "LAPACKE_chbgvx_work", info );
84             return info;
85         }
86         /* Allocate memory for temporary array(s) */
87         ab_t = (lapack_complex_float*)
88             LAPACKE_malloc( sizeof(lapack_complex_float) * ldab_t * MAX(1,n) );
89         if( ab_t == NULL ) {
90             info = LAPACK_TRANSPOSE_MEMORY_ERROR;
91             goto exit_level_0;
92         }
93         bb_t = (lapack_complex_float*)
94             LAPACKE_malloc( sizeof(lapack_complex_float) * ldbb_t * MAX(1,n) );
95         if( bb_t == NULL ) {
96             info = LAPACK_TRANSPOSE_MEMORY_ERROR;
97             goto exit_level_1;
98         }
99         if( LAPACKE_lsame( jobz, 'v' ) ) {
100             q_t = (lapack_complex_float*)
101                 LAPACKE_malloc( sizeof(lapack_complex_float) *
102                                 ldq_t * MAX(1,n) );
103             if( q_t == NULL ) {
104                 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
105                 goto exit_level_2;
106             }
107         }
108         if( LAPACKE_lsame( jobz, 'v' ) ) {
109             z_t = (lapack_complex_float*)
110                 LAPACKE_malloc( sizeof(lapack_complex_float) *
111                                 ldz_t * MAX(1,n) );
112             if( z_t == NULL ) {
113                 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
114                 goto exit_level_3;
115             }
116         }
117         /* Transpose input matrices */
118         LAPACKE_chb_trans( matrix_layout, uplo, n, ka, ab, ldab, ab_t, ldab_t );
119         LAPACKE_chb_trans( matrix_layout, uplo, n, kb, bb, ldbb, bb_t, ldbb_t );
120         /* Call LAPACK function and adjust info */
121         LAPACK_chbgvx( &jobz, &range, &uplo, &n, &ka, &kb, ab_t, &ldab_t, bb_t,
122                        &ldbb_t, q_t, &ldq_t, &vl, &vu, &il, &iu, &abstol, m, w,
123                        z_t, &ldz_t, work, rwork, iwork, ifail, &info );
124         if( info < 0 ) {
125             info = info - 1;
126         }
127         /* Transpose output matrices */
128         LAPACKE_chb_trans( LAPACK_COL_MAJOR, uplo, n, ka, ab_t, ldab_t, ab,
129                            ldab );
130         LAPACKE_chb_trans( LAPACK_COL_MAJOR, uplo, n, kb, bb_t, ldbb_t, bb,
131                            ldbb );
132         if( LAPACKE_lsame( jobz, 'v' ) ) {
133             LAPACKE_cge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
134         }
135         if( LAPACKE_lsame( jobz, 'v' ) ) {
136             LAPACKE_cge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
137         }
138         /* Release memory and exit */
139         if( LAPACKE_lsame( jobz, 'v' ) ) {
140             LAPACKE_free( z_t );
141         }
142 exit_level_3:
143         if( LAPACKE_lsame( jobz, 'v' ) ) {
144             LAPACKE_free( q_t );
145         }
146 exit_level_2:
147         LAPACKE_free( bb_t );
148 exit_level_1:
149         LAPACKE_free( ab_t );
150 exit_level_0:
151         if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
152             LAPACKE_xerbla( "LAPACKE_chbgvx_work", info );
153         }
154     } else {
155         info = -1;
156         LAPACKE_xerbla( "LAPACKE_chbgvx_work", info );
157     }
158     return info;
159 }
160