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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 dgesvd
30 * Author: Intel Corporation
31 *****************************************************************************/
32
33 #include "lapacke_utils.h"
34
LAPACKE_dgesvd_work(int matrix_layout,char jobu,char jobvt,lapack_int m,lapack_int n,double * a,lapack_int lda,double * s,double * u,lapack_int ldu,double * vt,lapack_int ldvt,double * work,lapack_int lwork)35 lapack_int LAPACKE_dgesvd_work( int matrix_layout, char jobu, char jobvt,
36 lapack_int m, lapack_int n, double* a,
37 lapack_int lda, double* s, double* u,
38 lapack_int ldu, double* vt, lapack_int ldvt,
39 double* work, lapack_int lwork )
40 {
41 lapack_int info = 0;
42 if( matrix_layout == LAPACK_COL_MAJOR ) {
43 /* Call LAPACK function and adjust info */
44 LAPACK_dgesvd( &jobu, &jobvt, &m, &n, a, &lda, s, u, &ldu, vt, &ldvt,
45 work, &lwork, &info );
46 if( info < 0 ) {
47 info = info - 1;
48 }
49 } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
50 lapack_int nrows_u = ( LAPACKE_lsame( jobu, 'a' ) ||
51 LAPACKE_lsame( jobu, 's' ) ) ? m : 1;
52 lapack_int ncols_u = LAPACKE_lsame( jobu, 'a' ) ? m :
53 ( LAPACKE_lsame( jobu, 's' ) ? MIN(m,n) : 1);
54 lapack_int nrows_vt = LAPACKE_lsame( jobvt, 'a' ) ? n :
55 ( LAPACKE_lsame( jobvt, 's' ) ? MIN(m,n) : 1);
56 lapack_int ncols_vt = ( LAPACKE_lsame( jobvt, 'a' ) ||
57 LAPACKE_lsame( jobvt, 's' ) ) ? n : 1;
58 lapack_int lda_t = MAX(1,m);
59 lapack_int ldu_t = MAX(1,nrows_u);
60 lapack_int ldvt_t = MAX(1,nrows_vt);
61 double* a_t = NULL;
62 double* u_t = NULL;
63 double* vt_t = NULL;
64 /* Check leading dimension(s) */
65 if( lda < n ) {
66 info = -7;
67 LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
68 return info;
69 }
70 if( ldu < ncols_u ) {
71 info = -10;
72 LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
73 return info;
74 }
75 if( ldvt < ncols_vt ) {
76 info = -12;
77 LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
78 return info;
79 }
80 /* Query optimal working array(s) size if requested */
81 if( lwork == -1 ) {
82 LAPACK_dgesvd( &jobu, &jobvt, &m, &n, a, &lda_t, s, u, &ldu_t, vt,
83 &ldvt_t, work, &lwork, &info );
84 return (info < 0) ? (info - 1) : info;
85 }
86 /* Allocate memory for temporary array(s) */
87 a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
88 if( a_t == NULL ) {
89 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
90 goto exit_level_0;
91 }
92 if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
93 u_t = (double*)
94 LAPACKE_malloc( sizeof(double) * ldu_t * MAX(1,ncols_u) );
95 if( u_t == NULL ) {
96 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
97 goto exit_level_1;
98 }
99 }
100 if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
101 vt_t = (double*)
102 LAPACKE_malloc( sizeof(double) * ldvt_t * MAX(1,n) );
103 if( vt_t == NULL ) {
104 info = LAPACK_TRANSPOSE_MEMORY_ERROR;
105 goto exit_level_2;
106 }
107 }
108 /* Transpose input matrices */
109 LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
110 /* Call LAPACK function and adjust info */
111 LAPACK_dgesvd( &jobu, &jobvt, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
112 &ldvt_t, work, &lwork, &info );
113 if( info < 0 ) {
114 info = info - 1;
115 }
116 /* Transpose output matrices */
117 LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
118 if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
119 LAPACKE_dge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
120 u, ldu );
121 }
122 if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
123 LAPACKE_dge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
124 ldvt );
125 }
126 /* Release memory and exit */
127 if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
128 LAPACKE_free( vt_t );
129 }
130 exit_level_2:
131 if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
132 LAPACKE_free( u_t );
133 }
134 exit_level_1:
135 LAPACKE_free( a_t );
136 exit_level_0:
137 if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
138 LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
139 }
140 } else {
141 info = -1;
142 LAPACKE_xerbla( "LAPACKE_dgesvd_work", info );
143 }
144 return info;
145 }
146