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*****************************************************************************
* Contents: Native middle-level C interface to LAPACK function dgghd3
* Author: Intel Corporation
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_dgghd3_work( int matrix_layout, char compq, char compz,
                                lapack_int n, lapack_int ilo, lapack_int ihi,
                                double* a, lapack_int lda, double* b,
                                lapack_int ldb, double* q, lapack_int ldq,
                                double* z, lapack_int ldz, double* work,
                                lapack_int lwork )
{
  lapack_int info = 0;
  if( matrix_layout == LAPACK_COL_MAJOR ) {
    /* Call LAPACK function and adjust info */
    LAPACK_dgghd3( &compq, &compz, &n, &ilo, &ihi, a, &lda, b, &ldb, q,
                   &ldq, z, &ldz, work, &lwork, &info );
    if( info < 0 ) {
      info = info - 1;
    }
  } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
    lapack_int lda_t = MAX(1,n);
    lapack_int ldb_t = MAX(1,n);
    lapack_int ldq_t = MAX(1,n);
    lapack_int ldz_t = MAX(1,n);
    double* a_t = NULL;
    double* b_t = NULL;
    double* q_t = NULL;
    double* z_t = NULL;
    /* Query optimal working array(s) size if requested */
    if( lwork == -1 ) {
      LAPACK_dgghd3( &compq, &compz, &n, &ilo, &ihi, a, &lda, b, &ldb, q,
                     &ldq, z, &ldz, work, &lwork, &info );
      return (info < 0) ? (info - 1) : info;
    }
    /* Check leading dimension(s) */
    if( lda < n ) {
      info = -8;
      LAPACKE_xerbla( "LAPACKE_dgghd3_work", info );
      return info;
    }
    if( ldb < n ) {
      info = -10;
      LAPACKE_xerbla( "LAPACKE_dgghd3_work", info );
      return info;
    }
    if( ldq < n ) {
      info = -12;
      LAPACKE_xerbla( "LAPACKE_dgghd3_work", info );
      return info;
    }
    if( ldz < n ) {
      info = -14;
      LAPACKE_xerbla( "LAPACKE_dgghd3_work", info );
      return info;
    }
    /* Allocate memory for temporary array(s) */
    a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
    if( a_t == NULL ) {
      info = LAPACK_TRANSPOSE_MEMORY_ERROR;
      goto exit_level_0;
    }
    b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,n) );
    if( b_t == NULL ) {
      info = LAPACK_TRANSPOSE_MEMORY_ERROR;
      goto exit_level_1;
    }
    if( LAPACKE_lsame( compq, 'i' ) || LAPACKE_lsame( compq, 'v' ) ) {
      q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
      if( q_t == NULL ) {
        info = LAPACK_TRANSPOSE_MEMORY_ERROR;
        goto exit_level_2;
      }
    }
    if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
      z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,n) );
      if( z_t == NULL ) {
        info = LAPACK_TRANSPOSE_MEMORY_ERROR;
        goto exit_level_3;
      }
    }
    /* Transpose input matrices */
    LAPACKE_dge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
    LAPACKE_dge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
    if( LAPACKE_lsame( compq, 'v' ) ) {
      LAPACKE_dge_trans( matrix_layout, n, n, q, ldq, q_t, ldq_t );
    }
    if( LAPACKE_lsame( compz, 'v' ) ) {
      LAPACKE_dge_trans( matrix_layout, n, n, z, ldz, z_t, ldz_t );
    }
    /* Call LAPACK function and adjust info */
    LAPACK_dgghd3( &compq, &compz, &n, &ilo, &ihi, a_t, &lda_t, b_t, &ldb_t,
                   q_t, &ldq_t, z_t, &ldz_t, work, &lwork, &info );
    if( info < 0 ) {
      info = info - 1;
    }
    /* Transpose output matrices */
    LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
    LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, b_t, ldb_t, b, ldb );
    if( LAPACKE_lsame( compq, 'i' ) || LAPACKE_lsame( compq, 'v' ) ) {
      LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
    }
    if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
      LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
    }
    /* Release memory and exit */
    if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
      LAPACKE_free( z_t );
    }
  exit_level_3:
    if( LAPACKE_lsame( compq, 'i' ) || LAPACKE_lsame( compq, 'v' ) ) {
      LAPACKE_free( q_t );
    }
  exit_level_2:
    LAPACKE_free( b_t );
  exit_level_1:
    LAPACKE_free( a_t );
  exit_level_0:
    if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
      LAPACKE_xerbla( "LAPACKE_dgghd3_work", info );
    }
  } else {
    info = -1;
    LAPACKE_xerbla( "LAPACKE_dgghd3_work", info );
  }
  return info;
}
