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

#include "lapacke_utils.h"

lapack_int LAPACKE_zgemqrt_work( int matrix_layout, char side, char trans,
                                 lapack_int m, lapack_int n, lapack_int k,
                                 lapack_int nb, const lapack_complex_double* v,
                                 lapack_int ldv, const lapack_complex_double* t,
                                 lapack_int ldt, lapack_complex_double* c,
                                 lapack_int ldc, lapack_complex_double* work )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zgemqrt( &side, &trans, &m, &n, &k, &nb, v, &ldv, t, &ldt, c,
                        &ldc, work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldc_t = MAX(1,m);
        lapack_int ldt_t = MAX(1,ldt);
        lapack_int ldv_t = MAX(1,ldv);
        lapack_complex_double* v_t = NULL;
        lapack_complex_double* t_t = NULL;
        lapack_complex_double* c_t = NULL;
        /* Check leading dimension(s) */
        if( ldc < n ) {
            info = -13;
            LAPACKE_xerbla( "LAPACKE_zgemqrt_work", info );
            return info;
        }
        if( ldt < nb ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_zgemqrt_work", info );
            return info;
        }
        if( ldv < k ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_zgemqrt_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        v_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldv_t * MAX(1,k) );
        if( v_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        t_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldt_t * MAX(1,nb) );
        if( t_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        c_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldc_t * MAX(1,n) );
        if( c_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, ldv, k, v, ldv, v_t, ldv_t );
        LAPACKE_zge_trans( matrix_layout, ldt, nb, t, ldt, t_t, ldt_t );
        LAPACKE_zge_trans( matrix_layout, m, n, c, ldc, c_t, ldc_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zgemqrt( &side, &trans, &m, &n, &k, &nb, v_t, &ldv_t, t_t,
                        &ldt_t, c_t, &ldc_t, work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, m, n, c_t, ldc_t, c, ldc );
        /* Release memory and exit */
        LAPACKE_free( c_t );
exit_level_2:
        LAPACKE_free( t_t );
exit_level_1:
        LAPACKE_free( v_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zgemqrt_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zgemqrt_work", info );
    }
    return info;
}
