LAPACK  3.10.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_sgesvd_work()

lapack_int LAPACKE_sgesvd_work ( int  matrix_layout,
char  jobu,
char  jobvt,
lapack_int  m,
lapack_int  n,
float *  a,
lapack_int  lda,
float *  s,
float *  u,
lapack_int  ldu,
float *  vt,
lapack_int  ldvt,
float *  work,
lapack_int  lwork 
)

Definition at line 35 of file lapacke_sgesvd_work.c.

40 {
41  lapack_int info = 0;
42  if( matrix_layout == LAPACK_COL_MAJOR ) {
43  /* Call LAPACK function and adjust info */
44  LAPACK_sgesvd( &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  float* a_t = NULL;
62  float* u_t = NULL;
63  float* vt_t = NULL;
64  /* Check leading dimension(s) */
65  if( lda < n ) {
66  info = -7;
67  LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
68  return info;
69  }
70  if( ldu < ncols_u ) {
71  info = -10;
72  LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
73  return info;
74  }
75  if( ldvt < ncols_vt ) {
76  info = -12;
77  LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
78  return info;
79  }
80  /* Query optimal working array(s) size if requested */
81  if( lwork == -1 ) {
82  LAPACK_sgesvd( &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 = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
88  if( a_t == NULL ) {
90  goto exit_level_0;
91  }
92  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
93  u_t = (float*)
94  LAPACKE_malloc( sizeof(float) * ldu_t * MAX(1,ncols_u) );
95  if( u_t == NULL ) {
97  goto exit_level_1;
98  }
99  }
100  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
101  vt_t = (float*)LAPACKE_malloc( sizeof(float) * ldvt_t * MAX(1,n) );
102  if( vt_t == NULL ) {
104  goto exit_level_2;
105  }
106  }
107  /* Transpose input matrices */
108  LAPACKE_sge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
109  /* Call LAPACK function and adjust info */
110  LAPACK_sgesvd( &jobu, &jobvt, &m, &n, a_t, &lda_t, s, u_t, &ldu_t, vt_t,
111  &ldvt_t, work, &lwork, &info );
112  if( info < 0 ) {
113  info = info - 1;
114  }
115  /* Transpose output matrices */
116  LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
117  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
118  LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_u, ncols_u, u_t, ldu_t,
119  u, ldu );
120  }
121  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
122  LAPACKE_sge_trans( LAPACK_COL_MAJOR, nrows_vt, n, vt_t, ldvt_t, vt,
123  ldvt );
124  }
125  /* Release memory and exit */
126  if( LAPACKE_lsame( jobvt, 'a' ) || LAPACKE_lsame( jobvt, 's' ) ) {
127  LAPACKE_free( vt_t );
128  }
129 exit_level_2:
130  if( LAPACKE_lsame( jobu, 'a' ) || LAPACKE_lsame( jobu, 's' ) ) {
131  LAPACKE_free( u_t );
132  }
133 exit_level_1:
134  LAPACKE_free( a_t );
135 exit_level_0:
136  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
137  LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
138  }
139  } else {
140  info = -1;
141  LAPACKE_xerbla( "LAPACKE_sgesvd_work", info );
142  }
143  return info;
144 }
#define LAPACK_sgesvd(...)
Definition: lapack.h:3411
#define lapack_int
Definition: lapack.h:83
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
#define LAPACKE_free(p)
Definition: lapacke.h:46
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:56
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:35
void LAPACKE_xerbla(const char *name, lapack_int info)
#define MIN(x, y)
Definition: lapacke_utils.h:49
void LAPACKE_sge_trans(int matrix_layout, lapack_int m, lapack_int n, const float *in, lapack_int ldin, float *out, lapack_int ldout)
#define MAX(x, y)
Definition: lapacke_utils.h:46
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