LAPACK  3.10.0
LAPACK: Linear Algebra PACKage

◆ LAPACKE_ssyevx_2stage_work()

lapack_int LAPACKE_ssyevx_2stage_work ( int  matrix_layout,
char  jobz,
char  range,
char  uplo,
lapack_int  n,
float *  a,
lapack_int  lda,
float  vl,
float  vu,
lapack_int  il,
lapack_int  iu,
float  abstol,
lapack_int m,
float *  w,
float *  z,
lapack_int  ldz,
float *  work,
lapack_int  lwork,
lapack_int iwork,
lapack_int ifail 
)

Definition at line 35 of file lapacke_ssyevx_2stage_work.c.

42 {
43  lapack_int info = 0;
44  if( matrix_layout == LAPACK_COL_MAJOR ) {
45  /* Call LAPACK function and adjust info */
46  LAPACK_ssyevx_2stage( &jobz, &range, &uplo, &n, a, &lda, &vl, &vu, &il, &iu,
47  &abstol, m, w, z, &ldz, work, &lwork, iwork, ifail,
48  &info );
49  if( info < 0 ) {
50  info = info - 1;
51  }
52  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
53  lapack_int ncols_z = ( LAPACKE_lsame( range, 'a' ) ||
54  LAPACKE_lsame( range, 'v' ) ) ? n :
55  ( LAPACKE_lsame( range, 'i' ) ? (iu-il+1) : 1);
56  lapack_int lda_t = MAX(1,n);
57  lapack_int ldz_t = MAX(1,n);
58  float* a_t = NULL;
59  float* z_t = NULL;
60  /* Check leading dimension(s) */
61  if( lda < n ) {
62  info = -7;
63  LAPACKE_xerbla( "LAPACKE_ssyevx_2stage_work", info );
64  return info;
65  }
66  if( ldz < ncols_z ) {
67  info = -16;
68  LAPACKE_xerbla( "LAPACKE_ssyevx_2stage_work", info );
69  return info;
70  }
71  /* Query optimal working array(s) size if requested */
72  if( lwork == -1 ) {
73  LAPACK_ssyevx_2stage( &jobz, &range, &uplo, &n, a, &lda_t, &vl, &vu, &il,
74  &iu, &abstol, m, w, z, &ldz_t, work, &lwork, iwork,
75  ifail, &info );
76  return (info < 0) ? (info - 1) : info;
77  }
78  /* Allocate memory for temporary array(s) */
79  a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
80  if( a_t == NULL ) {
82  goto exit_level_0;
83  }
84  if( LAPACKE_lsame( jobz, 'v' ) ) {
85  z_t = (float*)
86  LAPACKE_malloc( sizeof(float) * ldz_t * MAX(1,ncols_z) );
87  if( z_t == NULL ) {
89  goto exit_level_1;
90  }
91  }
92  /* Transpose input matrices */
93  LAPACKE_ssy_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
94  /* Call LAPACK function and adjust info */
95  LAPACK_ssyevx_2stage( &jobz, &range, &uplo, &n, a_t, &lda_t, &vl, &vu, &il,
96  &iu, &abstol, m, w, z_t, &ldz_t, work, &lwork, iwork,
97  ifail, &info );
98  if( info < 0 ) {
99  info = info - 1;
100  }
101  /* Transpose output matrices */
102  LAPACKE_ssy_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda );
103  if( LAPACKE_lsame( jobz, 'v' ) ) {
104  LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, ncols_z, z_t, ldz_t, z,
105  ldz );
106  }
107  /* Release memory and exit */
108  if( LAPACKE_lsame( jobz, 'v' ) ) {
109  LAPACKE_free( z_t );
110  }
111 exit_level_1:
112  LAPACKE_free( a_t );
113 exit_level_0:
114  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
115  LAPACKE_xerbla( "LAPACKE_ssyevx_2stage_work", info );
116  }
117  } else {
118  info = -1;
119  LAPACKE_xerbla( "LAPACKE_ssyevx_2stage_work", info );
120  }
121  return info;
122 }
#define lapack_int
Definition: lapack.h:83
#define LAPACK_ssyevx_2stage(...)
Definition: lapack.h:17334
#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)
void LAPACKE_ssy_trans(int matrix_layout, char uplo, lapack_int n, const float *in, lapack_int ldin, float *out, lapack_int ldout)
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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