FLA_Hess_blk_external.c File Reference

(r12600)

Functions
FLA_Error	FLA_Hess_blk_external (FLA_Obj A, FLA_Obj t, int ilo, int ihi)
FLA_Error	FLA_Hess_blk_ext (FLA_Obj A, FLA_Obj t, int ilo, int ihi)

---

Function Documentation

FLA_Error FLA_Hess_blk_ext	(	FLA_Obj	A,
		FLA_Obj	t,
		int	ilo,
		int	ihi
	)

References FLA_Hess_blk_external().

{
  return FLA_Hess_blk_external( A, t, ilo, ihi );
}

FLA_Error FLA_Hess_blk_external	(	FLA_Obj	A,
		FLA_Obj	t,
		int	ilo,
		int	ihi
	)

References F77_cgehrd(), F77_dgehrd(), F77_sgehrd(), F77_zgehrd(), FLA_Check_error_level(), FLA_Hess_check(), FLA_Obj_col_stride(), FLA_Obj_create(), FLA_Obj_datatype(), FLA_Obj_free(), FLA_Obj_has_zero_dim(), FLA_Obj_width(), and FLA_Query_blocksize().

Referenced by FLA_Hess_blk_ext().

{
  int          info = 0;
#ifdef FLA_ENABLE_EXTERNAL_LAPACK_INTERFACES
  FLA_Datatype datatype;
  int          n_A, cs_A;
  int          lwork;
  FLA_Obj      work_obj;

  if ( FLA_Check_error_level() == FLA_FULL_ERROR_CHECKING )
    FLA_Hess_check( A, t, ilo, ihi );

  if ( FLA_Obj_has_zero_dim( A ) ) return FLA_SUCCESS;

  datatype = FLA_Obj_datatype( A );

  n_A      = FLA_Obj_width( A );
  cs_A     = FLA_Obj_col_stride( A );

  lwork    = n_A * FLA_Query_blocksize( datatype, FLA_DIMENSION_MIN );

  FLA_Obj_create( datatype, lwork, 1, 0, 0, &work_obj );

  // Shift ilo and ihi from zero-based indexing to one-based indexing.
  ilo += 1;
  ihi += 1;

  switch( datatype ){

  case FLA_FLOAT:
  {
    float *buff_A    = ( float * ) FLA_FLOAT_PTR( A );
    float *buff_t    = ( float * ) FLA_FLOAT_PTR( t );
    float *buff_work = ( float * ) FLA_FLOAT_PTR( work_obj );

    F77_sgehrd( &n_A,
                &ilo,
                &ihi,
                buff_A, &cs_A,
                buff_t,
                buff_work,
                &lwork,
                &info );

    break;
  }

  case FLA_DOUBLE:
  {
    double *buff_A    = ( double * ) FLA_DOUBLE_PTR( A );
    double *buff_t    = ( double * ) FLA_DOUBLE_PTR( t );
    double *buff_work = ( double * ) FLA_DOUBLE_PTR( work_obj );

    F77_dgehrd( &n_A,
                &ilo,
                &ihi,
                buff_A, &cs_A,
                buff_t,
                buff_work,
                &lwork,
                &info );

    break;
  } 

  case FLA_COMPLEX:
  {
    scomplex *buff_A    = ( scomplex * ) FLA_COMPLEX_PTR( A );
    scomplex *buff_t    = ( scomplex * ) FLA_COMPLEX_PTR( t );
    scomplex *buff_work = ( scomplex * ) FLA_COMPLEX_PTR( work_obj );

    F77_cgehrd( &n_A,
                &ilo,
                &ihi,
                buff_A, &cs_A,
                buff_t,
                buff_work,
                &lwork,
                &info );

    break;
  } 

  case FLA_DOUBLE_COMPLEX:
  {
    dcomplex *buff_A    = ( dcomplex * ) FLA_DOUBLE_COMPLEX_PTR( A );
    dcomplex *buff_t    = ( dcomplex * ) FLA_DOUBLE_COMPLEX_PTR( t );
    dcomplex *buff_work = ( dcomplex * ) FLA_DOUBLE_COMPLEX_PTR( work_obj );

    F77_zgehrd( &n_A,
                &ilo,
                &ihi,
                buff_A, &cs_A,
                buff_t,
                buff_work,
                &lwork,
                &info );

    break;
  } 

  }

  FLA_Obj_free( &work_obj );
#else
  FLA_Check_error_code( FLA_EXTERNAL_LAPACK_NOT_IMPLEMENTED );
#endif

  return info;
}