lapacke_zunbdb_work.c

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* Contents: Native middle-level C interface to LAPACK function zunbdb
* Author: Intel Corporation
* Generated November 2015
*****************************************************************************/

#include "lapacke_utils.h"

lapack_int LAPACKE_zunbdb_work( int matrix_layout, char trans, char signs,
                                lapack_int m, lapack_int p, lapack_int q,
                                lapack_complex_double* x11, lapack_int ldx11,
                                lapack_complex_double* x12, lapack_int ldx12,
                                lapack_complex_double* x21, lapack_int ldx21,
                                lapack_complex_double* x22, lapack_int ldx22,
                                double* theta, double* phi,
                                lapack_complex_double* taup1,
                                lapack_complex_double* taup2,
                                lapack_complex_double* tauq1,
                                lapack_complex_double* tauq2,
                                lapack_complex_double* work, lapack_int lwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zunbdb( &trans, &signs, &m, &p, &q, x11, &ldx11, x12, &ldx12,
                       x21, &ldx21, x22, &ldx22, theta, phi, taup1, taup2,
                       tauq1, tauq2, work, &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int nrows_x11 = ( LAPACKE_lsame( trans, 'n' ) ? p : q);
        lapack_int nrows_x12 = ( LAPACKE_lsame( trans, 'n' ) ? p : m-q);
        lapack_int nrows_x21 = ( LAPACKE_lsame( trans, 'n' ) ? m-p : q);
        lapack_int nrows_x22 = ( LAPACKE_lsame( trans, 'n' ) ? m-p : m-q);
        lapack_int ldx11_t = MAX(1,nrows_x11);
        lapack_int ldx12_t = MAX(1,nrows_x12);
        lapack_int ldx21_t = MAX(1,nrows_x21);
        lapack_int ldx22_t = MAX(1,nrows_x22);
        lapack_complex_double* x11_t = NULL;
        lapack_complex_double* x12_t = NULL;
        lapack_complex_double* x21_t = NULL;
        lapack_complex_double* x22_t = NULL;
        /* Check leading dimension(s) */
        if( ldx11 < q ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_zunbdb_work", info );
            return info;
        }
        if( ldx12 < m-q ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_zunbdb_work", info );
            return info;
        }
        if( ldx21 < q ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_zunbdb_work", info );
            return info;
        }
        if( ldx22 < m-q ) {
            info = -14;
            LAPACKE_xerbla( "LAPACKE_zunbdb_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_zunbdb( &trans, &signs, &m, &p, &q, x11, &ldx11_t, x12,
                           &ldx12_t, x21, &ldx21_t, x22, &ldx22_t, theta, phi,
                           taup1, taup2, tauq1, tauq2, work, &lwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        x11_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ldx11_t * MAX(1,q) );
        if( x11_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        x12_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ldx12_t * MAX(1,m-q) );
        if( x12_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        x21_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ldx21_t * MAX(1,q) );
        if( x21_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        x22_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ldx22_t * MAX(1,m-q) );
        if( x22_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_3;
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, nrows_x11, q, x11, ldx11, x11_t,
                           ldx11_t );
        LAPACKE_zge_trans( matrix_layout, nrows_x12, m-q, x12, ldx12, x12_t,
                           ldx12_t );
        LAPACKE_zge_trans( matrix_layout, nrows_x21, q, x21, ldx21, x21_t,
                           ldx21_t );
        LAPACKE_zge_trans( matrix_layout, nrows_x22, m-q, x22, ldx22, x22_t,
                           ldx22_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zunbdb( &trans, &signs, &m, &p, &q, x11_t, &ldx11_t, x12_t,
                       &ldx12_t, x21_t, &ldx21_t, x22_t, &ldx22_t, theta, phi,
                       taup1, taup2, tauq1, tauq2, work, &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_x11, q, x11_t, ldx11_t, x11,
                           ldx11 );
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_x12, m-q, x12_t, ldx12_t,
                           x12, ldx12 );
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_x21, q, x21_t, ldx21_t, x21,
                           ldx21 );
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, nrows_x22, m-q, x22_t, ldx22_t,
                           x22, ldx22 );
        /* Release memory and exit */
        LAPACKE_free( x22_t );
exit_level_3:
        LAPACKE_free( x21_t );
exit_level_2:
        LAPACKE_free( x12_t );
exit_level_1:
        LAPACKE_free( x11_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zunbdb_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zunbdb_work", info );
    }
    return info;
}