LAPACK  3.7.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_ssyevx_2stage()

lapack_int LAPACKE_ssyevx_2stage ( 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,
lapack_int ifail 
)

Definition at line 36 of file lapacke_ssyevx_2stage.c.

41 {
42  lapack_int info = 0;
43  lapack_int lwork = -1;
44  lapack_int* iwork = NULL;
45  float* work = NULL;
46  float work_query;
47  if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
48  LAPACKE_xerbla( "LAPACKE_ssyevx_2stage", -1 );
49  return -1;
50  }
51 #ifndef LAPACK_DISABLE_NAN_CHECK
52  /* Optionally check input matrices for NaNs */
53  if( LAPACKE_ssy_nancheck( matrix_layout, uplo, n, a, lda ) ) {
54  return -6;
55  }
56  if( LAPACKE_s_nancheck( 1, &abstol, 1 ) ) {
57  return -12;
58  }
59  if( LAPACKE_lsame( range, 'v' ) ) {
60  if( LAPACKE_s_nancheck( 1, &vl, 1 ) ) {
61  return -8;
62  }
63  }
64  if( LAPACKE_lsame( range, 'v' ) ) {
65  if( LAPACKE_s_nancheck( 1, &vu, 1 ) ) {
66  return -9;
67  }
68  }
69 #endif
70  /* Allocate memory for working array(s) */
71  iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,5*n) );
72  if( iwork == NULL ) {
74  goto exit_level_0;
75  }
76  /* Query optimal working array(s) size */
77  info = LAPACKE_ssyevx_2stage_work( matrix_layout, jobz, range, uplo, n, a, lda, vl,
78  vu, il, iu, abstol, m, w, z, ldz, &work_query,
79  lwork, iwork, ifail );
80  if( info != 0 ) {
81  goto exit_level_1;
82  }
83  lwork = (lapack_int)work_query;
84  /* Allocate memory for work arrays */
85  work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
86  if( work == NULL ) {
88  goto exit_level_1;
89  }
90  /* Call middle-level interface */
91  info = LAPACKE_ssyevx_2stage_work( matrix_layout, jobz, range, uplo, n, a, lda, vl,
92  vu, il, iu, abstol, m, w, z, ldz, work, lwork,
93  iwork, ifail );
94  /* Release memory and exit */
95  LAPACKE_free( work );
96 exit_level_1:
97  LAPACKE_free( iwork );
98 exit_level_0:
99  if( info == LAPACK_WORK_MEMORY_ERROR ) {
100  LAPACKE_xerbla( "LAPACKE_ssyevx_2stage", info );
101  }
102  return info;
103 }
lapack_logical LAPACKE_ssy_nancheck(int matrix_layout, char uplo, lapack_int n, const float *a, lapack_int lda)
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:119
#define LAPACK_WORK_MEMORY_ERROR
Definition: lapacke.h:122
#define LAPACKE_free(p)
Definition: lapacke.h:113
lapack_logical LAPACKE_s_nancheck(lapack_int n, const float *x, lapack_int incx)
#define MAX(x, y)
Definition: lapacke_utils.h:47
#define LAPACKE_malloc(size)
Definition: lapacke.h:110
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)
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:36
#define LAPACK_COL_MAJOR
Definition: lapacke.h:120
void LAPACKE_xerbla(const char *name, lapack_int info)
#define lapack_int
Definition: lapacke.h:47
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