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

#include "lapacke_utils.h"

lapack_int LAPACKE_dtgsyl_work( int matrix_layout, char trans, lapack_int ijob,
                                lapack_int m, lapack_int n, const double* a,
                                lapack_int lda, const double* b, lapack_int ldb,
                                double* c, lapack_int ldc, const double* d,
                                lapack_int ldd, const double* e, lapack_int lde,
                                double* f, lapack_int ldf, double* scale,
                                double* dif, double* work, lapack_int lwork,
                                lapack_int* iwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dtgsyl( &trans, &ijob, &m, &n, a, &lda, b, &ldb, c, &ldc, d,
                       &ldd, e, &lde, f, &ldf, scale, dif, work, &lwork, iwork,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,m);
        lapack_int ldb_t = MAX(1,n);
        lapack_int ldc_t = MAX(1,m);
        lapack_int ldd_t = MAX(1,m);
        lapack_int lde_t = MAX(1,n);
        lapack_int ldf_t = MAX(1,m);
        double* a_t = NULL;
        double* b_t = NULL;
        double* c_t = NULL;
        double* d_t = NULL;
        double* e_t = NULL;
        double* f_t = NULL;
        /* Check leading dimension(s) */
        if( lda < m ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dtgsyl_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_dtgsyl_work", info );
            return info;
        }
        if( ldc < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_dtgsyl_work", info );
            return info;
        }
        if( ldd < m ) {
            info = -13;
            LAPACKE_xerbla( "LAPACKE_dtgsyl_work", info );
            return info;
        }
        if( lde < n ) {
            info = -15;
            LAPACKE_xerbla( "LAPACKE_dtgsyl_work", info );
            return info;
        }
        if( ldf < n ) {
            info = -17;
            LAPACKE_xerbla( "LAPACKE_dtgsyl_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_dtgsyl( &trans, &ijob, &m, &n, a, &lda_t, b, &ldb_t, c,
                           &ldc_t, d, &ldd_t, e, &lde_t, f, &ldf_t, scale, dif,
                           work, &lwork, iwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,m) );
        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;
        }
        c_t = (double*)LAPACKE_malloc( sizeof(double) * ldc_t * MAX(1,n) );
        if( c_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        d_t = (double*)LAPACKE_malloc( sizeof(double) * ldd_t * MAX(1,m) );
        if( d_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_3;
        }
        e_t = (double*)LAPACKE_malloc( sizeof(double) * lde_t * MAX(1,n) );
        if( e_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_4;
        }
        f_t = (double*)LAPACKE_malloc( sizeof(double) * ldf_t * MAX(1,n) );
        if( f_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_5;
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, m, m, a, lda, a_t, lda_t );
        LAPACKE_dge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
        LAPACKE_dge_trans( matrix_layout, m, n, c, ldc, c_t, ldc_t );
        LAPACKE_dge_trans( matrix_layout, m, m, d, ldd, d_t, ldd_t );
        LAPACKE_dge_trans( matrix_layout, n, n, e, lde, e_t, lde_t );
        LAPACKE_dge_trans( matrix_layout, m, n, f, ldf, f_t, ldf_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dtgsyl( &trans, &ijob, &m, &n, a_t, &lda_t, b_t, &ldb_t, c_t,
                       &ldc_t, d_t, &ldd_t, e_t, &lde_t, f_t, &ldf_t, scale,
                       dif, work, &lwork, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, c_t, ldc_t, c, ldc );
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, m, n, f_t, ldf_t, f, ldf );
        /* Release memory and exit */
        LAPACKE_free( f_t );
exit_level_5:
        LAPACKE_free( e_t );
exit_level_4:
        LAPACKE_free( d_t );
exit_level_3:
        LAPACKE_free( c_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_dtgsyl_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dtgsyl_work", info );
    }
    return info;
}
