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2 Copyright (c) 2014, Intel Corp.
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28 *****************************************************************************
29 * Contents: Native middle-level C interface to LAPACK function dsbgvd
30 * Author: Intel Corporation
31 *****************************************************************************/
32
33 #include "lapacke_utils.h"
34
LAPACKE_dsbgvd_work(int matrix_layout,char jobz,char uplo,lapack_int n,lapack_int ka,lapack_int kb,double * ab,lapack_int ldab,double * bb,lapack_int ldbb,double * w,double * z,lapack_int ldz,double * work,lapack_int lwork,lapack_int * iwork,lapack_int liwork)35 lapack_int LAPACKE_dsbgvd_work( int matrix_layout, char jobz, char uplo,
36 lapack_int n, lapack_int ka, lapack_int kb,
37 double* ab, lapack_int ldab, double* bb,
38 lapack_int ldbb, double* w, double* z,
39 lapack_int ldz, double* work, lapack_int lwork,
40 lapack_int* iwork, lapack_int liwork )
41 {
42 lapack_int info = 0;
43 if( matrix_layout == LAPACK_COL_MAJOR ) {
44 /* Call LAPACK function and adjust info */
45 LAPACK_dsbgvd( &jobz, &uplo, &n, &ka, &kb, ab, &ldab, bb, &ldbb, w, z,
46 &ldz, work, &lwork, iwork, &liwork, &info );
47 if( info < 0 ) {
48 info = info - 1;
49 }
50 } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
51 lapack_int ldab_t = MAX(1,ka+1);
52 lapack_int ldbb_t = MAX(1,kb+1);
53 lapack_int ldz_t = MAX(1,n);
54 double* ab_t = NULL;
55 double* bb_t = NULL;
56 double* z_t = NULL;
57 /* Check leading dimension(s) */
58 if( ldab < n ) {
59 info = -8;
60 LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
61 return info;
62 }
63 if( ldbb < n ) {
64 info = -10;
65 LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
66 return info;
67 }
68 if( ldz < n ) {
69 info = -13;
70 LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
71 return info;
72 }
73 /* Query optimal working array(s) size if requested */
74 if( liwork == -1 || lwork == -1 ) {
75 LAPACK_dsbgvd( &jobz, &uplo, &n, &ka, &kb, ab, &ldab_t, bb, &ldbb_t,
76 w, z, &ldz_t, work, &lwork, iwork, &liwork, &info );
77 return (info < 0) ? (info - 1) : info;
78 }
79 /* Allocate memory for temporary array(s) */
80 ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
81 if( ab_t == NULL ) {
82 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
83 goto exit_level_0;
84 }
85 bb_t = (double*)LAPACKE_malloc( sizeof(double) * ldbb_t * MAX(1,n) );
86 if( bb_t == NULL ) {
87 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
88 goto exit_level_1;
89 }
90 if( LAPACKE_lsame( jobz, 'v' ) ) {
91 z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,n) );
92 if( z_t == NULL ) {
93 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
94 goto exit_level_2;
95 }
96 }
97 /* Transpose input matrices */
98 LAPACKE_dsb_trans( matrix_layout, uplo, n, ka, ab, ldab, ab_t, ldab_t );
99 LAPACKE_dsb_trans( matrix_layout, uplo, n, kb, bb, ldbb, bb_t, ldbb_t );
100 /* Call LAPACK function and adjust info */
101 LAPACK_dsbgvd( &jobz, &uplo, &n, &ka, &kb, ab_t, &ldab_t, bb_t, &ldbb_t,
102 w, z_t, &ldz_t, work, &lwork, iwork, &liwork, &info );
103 if( info < 0 ) {
104 info = info - 1;
105 }
106 /* Transpose output matrices */
107 LAPACKE_dsb_trans( LAPACK_COL_MAJOR, uplo, n, ka, ab_t, ldab_t, ab,
108 ldab );
109 LAPACKE_dsb_trans( LAPACK_COL_MAJOR, uplo, n, kb, bb_t, ldbb_t, bb,
110 ldbb );
111 if( LAPACKE_lsame( jobz, 'v' ) ) {
112 LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
113 }
114 /* Release memory and exit */
115 if( LAPACKE_lsame( jobz, 'v' ) ) {
116 LAPACKE_free( z_t );
117 }
118 exit_level_2:
119 LAPACKE_free( bb_t );
120 exit_level_1:
121 LAPACKE_free( ab_t );
122 exit_level_0:
123 if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
124 LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
125 }
126 } else {
127 info = -1;
128 LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
129 }
130 return info;
131 }
132