LAPACK  3.7.1
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 36 of file lapacke_dgebrd_work.c.

40 {
41  lapack_int info = 0;
42  if( matrix_layout == LAPACK_COL_MAJOR ) {
43  /* Call LAPACK function and adjust info */
44  LAPACK_dgebrd( &m, &n, a, &lda, d, e, tauq, taup, work, &lwork, &info );
45  if( info < 0 ) {
46  info = info - 1;
47  }
48  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
49  lapack_int lda_t = MAX(1,m);
50  double* a_t = NULL;
51  /* Check leading dimension(s) */
52  if( lda < n ) {
53  info = -5;
54  LAPACKE_xerbla( "LAPACKE_dgebrd_work", info );
55  return info;
56  }
57  /* Query optimal working array(s) size if requested */
58  if( lwork == -1 ) {
59  LAPACK_dgebrd( &m, &n, a, &lda_t, d, e, tauq, taup, work, &lwork,
60  &info );
61  return (info < 0) ? (info - 1) : info;
62  }
63  /* Allocate memory for temporary array(s) */
64  a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
65  if( a_t == NULL ) {
67  goto exit_level_0;
68  }
69  /* Transpose input matrices */
70  LAPACKE_dge_trans( matrix_layout, m, n, a, lda, a_t, lda_t );
71  /* Call LAPACK function and adjust info */
72  LAPACK_dgebrd( &m, &n, a_t, &lda_t, d, e, tauq, taup, work, &lwork,
73  &info );
74  if( info < 0 ) {
75  info = info - 1;
76  }
77  /* Transpose output matrices */
78  LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, a_t, lda_t, a, lda );
79  /* Release memory and exit */
80  LAPACKE_free( a_t );
81 exit_level_0:
82  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
83  LAPACKE_xerbla( "LAPACKE_dgebrd_work", info );
84  }
85  } else {
86  info = -1;
87  LAPACKE_xerbla( "LAPACKE_dgebrd_work", info );
88  }
89  return info;
90 }
void LAPACKE_dge_trans(int matrix_layout, lapack_int m, lapack_int n, const double *in, lapack_int ldin, double *out, lapack_int ldout)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACKE_free(p)
Definition: lapacke.h:113
#define MAX(x, y)
Definition: lapacke_utils.h:47
#define LAPACKE_malloc(size)
Definition: lapacke.h:110
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:123
void LAPACK_dgebrd(lapack_int *m, lapack_int *n, double *a, lapack_int *lda, double *d, double *e, double *tauq, double *taup, double *work, lapack_int *lwork, lapack_int *info)
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