LAPACK  3.10.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_dgebrd_work()

lapack_int LAPACKE_dgebrd_work ( int  matrix_layout,
lapack_int  m,
lapack_int  n,
double *  a,
lapack_int  lda,
double *  d,
double *  e,
double *  tauq,
double *  taup,
double *  work,
lapack_int  lwork 
)

Definition at line 35 of file lapacke_dgebrd_work.c.

39 {
40  lapack_int info = 0;
41  if( matrix_layout == LAPACK_COL_MAJOR ) {
42  /* Call LAPACK function and adjust info */
43  LAPACK_dgebrd( &m, &n, a, &lda, d, e, tauq, taup, work, &lwork, &info );
44  if( info < 0 ) {
45  info = info - 1;
46  }
47  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
48  lapack_int lda_t = MAX(1,m);
49  double* a_t = NULL;
50  /* Check leading dimension(s) */
51  if( lda < n ) {
52  info = -5;
53  LAPACKE_xerbla( "LAPACKE_dgebrd_work", info );
54  return info;
55  }
56  /* Query optimal working array(s) size if requested */
57  if( lwork == -1 ) {
58  LAPACK_dgebrd( &m, &n, a, &lda_t, d, e, tauq, taup, work, &lwork,
59  &info );
60  return (info < 0) ? (info - 1) : info;
61  }
62  /* Allocate memory for temporary array(s) */
63  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
64  if( a_t == NULL ) {
66  goto exit_level_0;
67  }
68  /* Transpose input matrices */
69  LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
70  /* Call LAPACK function and adjust info */
71  LAPACK_dgebrd( &m, &n, a_t, &lda_t, d, e, tauq, taup, work, &lwork,
72  &info );
73  if( info < 0 ) {
74  info = info - 1;
75  }
76  /* Transpose output matrices */
77  LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
78  /* Release memory and exit */
79  LAPACKE_free( a_t );
80 exit_level_0:
81  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
82  LAPACKE_xerbla( "LAPACKE_dgebrd_work", info );
83  }
84  } else {
85  info = -1;
86  LAPACKE_xerbla( "LAPACKE_dgebrd_work", info );
87  }
88  return info;
89 }
#define lapack_int
Definition: lapack.h:83
void LAPACK_dgebrd(lapack_int const *m, lapack_int const *n, double *A, lapack_int const *lda, double *D, double *E, double *tauq, double *taup, double *work, lapack_int const *lwork, lapack_int *info)
#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
void LAPACKE_xerbla(const char *name, lapack_int info)
#define MAX(x, y)
Definition: lapacke_utils.h:46
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
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