LAPACK  3.9.1
LAPACK: Linear Algebra PACKage

◆ LAPACKE_slarfb_work()

lapack_int LAPACKE_slarfb_work ( int  matrix_layout,
char  side,
char  trans,
char  direct,
char  storev,
lapack_int  m,
lapack_int  n,
lapack_int  k,
const float *  v,
lapack_int  ldv,
const float *  t,
lapack_int  ldt,
float *  c,
lapack_int  ldc,
float *  work,
lapack_int  ldwork 
)

Definition at line 35 of file lapacke_slarfb_work.c.

41 {
42  lapack_int info = 0;
43  lapack_int nrows_v, ncols_v;
44  lapack_int ldc_t, ldt_t, ldv_t;
45  float *v_t = NULL, *t_t = NULL, *c_t = NULL;
46  if( matrix_layout == LAPACK_COL_MAJOR ) {
47  /* Call LAPACK function and adjust info */
48  LAPACK_slarfb( &side, &trans, &direct, &storev, &m, &n, &k, v, &ldv, t,
49  &ldt, c, &ldc, work, &ldwork );
50  if( info < 0 ) {
51  info = info - 1;
52  }
53  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
54  nrows_v = ( LAPACKE_lsame( storev, 'c' ) &&
55  LAPACKE_lsame( side, 'l' ) ) ? m :
56  ( ( LAPACKE_lsame( storev, 'c' ) &&
57  LAPACKE_lsame( side, 'r' ) ) ? n :
58  ( LAPACKE_lsame( storev, 'r' ) ? k : 1) );
59  ncols_v = LAPACKE_lsame( storev, 'c' ) ? k :
60  ( ( LAPACKE_lsame( storev, 'r' ) &&
61  LAPACKE_lsame( side, 'l' ) ) ? m :
62  ( ( LAPACKE_lsame( storev, 'r' ) &&
63  LAPACKE_lsame( side, 'r' ) ) ? n : 1) );
64  ldc_t = MAX(1,m);
65  ldt_t = MAX(1,k);
66  ldv_t = MAX(1,nrows_v);
67  /* Check leading dimension(s) */
68  if( ldc < n ) {
69  info = -14;
70  LAPACKE_xerbla( "LAPACKE_slarfb_work", info );
71  return info;
72  }
73  if( ldt < k ) {
74  info = -12;
75  LAPACKE_xerbla( "LAPACKE_slarfb_work", info );
76  return info;
77  }
78  if( ldv < ncols_v ) {
79  info = -10;
80  LAPACKE_xerbla( "LAPACKE_slarfb_work", info );
81  return info;
82  }
83  /* Allocate memory for temporary array(s) */
84  v_t = (float*)LAPACKE_malloc( sizeof(float) * ldv_t * MAX(1,ncols_v) );
85  if( v_t == NULL ) {
86  info = LAPACK_TRANSPOSE_MEMORY_ERROR;
87  goto exit_level_0;
88  }
89  t_t = (float*)LAPACKE_malloc( sizeof(float) * ldt_t * MAX(1,k) );
90  if( t_t == NULL ) {
91  info = LAPACK_TRANSPOSE_MEMORY_ERROR;
92  goto exit_level_1;
93  }
94  c_t = (float*)LAPACKE_malloc( sizeof(float) * ldc_t * MAX(1,n) );
95  if( c_t == NULL ) {
96  info = LAPACK_TRANSPOSE_MEMORY_ERROR;
97  goto exit_level_2;
98  }
99  /* Transpose input matrices */
100  if( LAPACKE_lsame( storev, 'c' ) && LAPACKE_lsame( direct, 'f' ) ) {
101  LAPACKE_str_trans( matrix_layout, 'l', 'u', k, v, ldv, v_t, ldv_t );
102  LAPACKE_sge_trans( matrix_layout, nrows_v-k, ncols_v, &v[k*ldv], ldv,
103  &v_t[k], ldv_t );
104  } else if( LAPACKE_lsame( storev, 'c' ) &&
105  LAPACKE_lsame( direct, 'b' ) ) {
106  if( k > nrows_v ) {
107  LAPACKE_xerbla( "LAPACKE_slarfb_work", -8 );
108  return -8;
109  }
110  LAPACKE_str_trans( matrix_layout, 'u', 'u', k, &v[(nrows_v-k)*ldv],
111  ldv, &v_t[nrows_v-k], ldv_t );
112  LAPACKE_sge_trans( matrix_layout, nrows_v-k, ncols_v, v, ldv, v_t,
113  ldv_t );
114  } else if( LAPACKE_lsame( storev, 'r' ) &&
115  LAPACKE_lsame( direct, 'f' ) ) {
116  LAPACKE_str_trans( matrix_layout, 'u', 'u', k, v, ldv, v_t, ldv_t );
117  LAPACKE_sge_trans( matrix_layout, nrows_v, ncols_v-k, &v[k], ldv,
118  &v_t[k*ldv_t], ldv_t );
119  } else if( LAPACKE_lsame( storev, 'r' ) &&
120  LAPACKE_lsame( direct, 'b' ) ) {
121  if( k > ncols_v ) {
122  LAPACKE_xerbla( "LAPACKE_slarfb_work", -8 );
123  return -8;
124  }
125  LAPACKE_str_trans( matrix_layout, 'l', 'u', k, &v[ncols_v-k], ldv,
126  &v_t[(ncols_v-k)*ldv_t], ldv_t );
127  LAPACKE_sge_trans( matrix_layout, nrows_v, ncols_v-k, v, ldv, v_t,
128  ldv_t );
129  }
130  LAPACKE_sge_trans( matrix_layout, k, k, t, ldt, t_t, ldt_t );
131  LAPACKE_sge_trans( matrix_layout, m, n, c, ldc, c_t, ldc_t );
132  /* Call LAPACK function and adjust info */
133  LAPACK_slarfb( &side, &trans, &direct, &storev, &m, &n, &k, v_t, &ldv_t,
134  t_t, &ldt_t, c_t, &ldc_t, work, &ldwork );
135  info = 0; /* LAPACK call is ok! */
136  /* Transpose output matrices */
137  LAPACKE_sge_trans( LAPACK_COL_MAJOR, m, n, c_t, ldc_t, c, ldc );
138  /* Release memory and exit */
139  LAPACKE_free( c_t );
140 exit_level_2:
141  LAPACKE_free( t_t );
142 exit_level_1:
143  LAPACKE_free( v_t );
144 exit_level_0:
145  if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
146  LAPACKE_xerbla( "LAPACKE_slarfb_work", info );
147  }
148  } else {
149  info = -1;
150  LAPACKE_xerbla( "LAPACKE_slarfb_work", info );
151  }
152  return info;
153 }
lapack_int
#define lapack_int
Definition: lapack.h:83
LAPACK_slarfb
void LAPACK_slarfb(char const *side, char const *trans, char const *direct, char const *storev, lapack_int const *m, lapack_int const *n, lapack_int const *k, float const *V, lapack_int const *ldv, float const *T, lapack_int const *ldt, float *C, lapack_int const *ldc, float *work, lapack_int const *ldwork)
LAPACK_COL_MAJOR
#define LAPACK_COL_MAJOR
Definition: lapacke.h:53
LAPACKE_free
#define LAPACKE_free(p)
Definition: lapacke.h:46
LAPACK_ROW_MAJOR
#define LAPACK_ROW_MAJOR
Definition: lapacke.h:52
LAPACKE_malloc
#define LAPACKE_malloc(size)
Definition: lapacke.h:43
LAPACK_TRANSPOSE_MEMORY_ERROR
#define LAPACK_TRANSPOSE_MEMORY_ERROR
Definition: lapacke.h:56
LAPACKE_lsame
lapack_logical LAPACKE_lsame(char ca, char cb)
Definition: lapacke_lsame.c:35
LAPACKE_xerbla
void LAPACKE_xerbla(const char *name, lapack_int info)
Definition: lapacke_xerbla.c:36
LAPACKE_sge_trans
void LAPACKE_sge_trans(int matrix_layout, lapack_int m, lapack_int n, const float *in, lapack_int ldin, float *out, lapack_int ldout)
Definition: lapacke_sge_trans.c:39
MAX
#define MAX(x, y)
Definition: lapacke_utils.h:46
LAPACKE_str_trans
void LAPACKE_str_trans(int matrix_layout, char uplo, char diag, lapack_int n, const float *in, lapack_int ldin, float *out, lapack_int ldout)
Definition: lapacke_str_trans.c:39
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