lapacke_zgtrfs_work.c

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* Contents: Native middle-level C interface to LAPACK function zgtrfs
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zgtrfs_work( int matrix_layout, char trans, lapack_int n,
                                lapack_int nrhs,
                                const lapack_complex_double* dl,
                                const lapack_complex_double* d,
                                const lapack_complex_double* du,
                                const lapack_complex_double* dlf,
                                const lapack_complex_double* df,
                                const lapack_complex_double* duf,
                                const lapack_complex_double* du2,
                                const lapack_int* ipiv,
                                const lapack_complex_double* b, lapack_int ldb,
                                lapack_complex_double* x, lapack_int ldx,
                                double* ferr, double* berr,
                                lapack_complex_double* work, double* rwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zgtrfs( &trans, &n, &nrhs, dl, d, du, dlf, df, duf, du2, ipiv, b,
                       &ldb, x, &ldx, ferr, berr, work, rwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldb_t = MAX(1,n);
        lapack_int ldx_t = MAX(1,n);
        lapack_complex_double* b_t = NULL;
        lapack_complex_double* x_t = NULL;
        /* Check leading dimension(s) */
        if( ldb < nrhs ) {
            info = -14;
            LAPACKE_xerbla( "LAPACKE_zgtrfs_work", info );
            return info;
        }
        if( ldx < nrhs ) {
            info = -16;
            LAPACKE_xerbla( "LAPACKE_zgtrfs_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        b_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ldb_t * MAX(1,nrhs) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        x_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ldx_t * MAX(1,nrhs) );
        if( x_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_zge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
        LAPACKE_zge_trans( matrix_layout, n, nrhs, x, ldx, x_t, ldx_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zgtrfs( &trans, &n, &nrhs, dl, d, du, dlf, df, duf, du2, ipiv,
                       b_t, &ldb_t, x_t, &ldx_t, ferr, berr, work, rwork,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, nrhs, x_t, ldx_t, x, ldx );
        /* Release memory and exit */
        LAPACKE_free( x_t );
exit_level_1:
        LAPACKE_free( b_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zgtrfs_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zgtrfs_work", info );
    }
    return info;
}