lapacke_dgbtrf_work.c

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* Contents: Native middle-level C interface to LAPACK function dgbtrf
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dgbtrf_work( int matrix_layout, lapack_int m, lapack_int n,
                                lapack_int kl, lapack_int ku, double* ab,
                                lapack_int ldab, lapack_int* ipiv )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dgbtrf( &m, &n, &kl, &ku, ab, &ldab, ipiv, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,2*kl+ku+1);
        double* ab_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dgbtrf_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
        if( ab_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        /* Transpose input matrices */
        LAPACKE_dgb_trans( matrix_layout, m, n, kl, kl+ku, ab, ldab, ab_t,
                           ldab_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dgbtrf( &m, &n, &kl, &ku, ab_t, &ldab_t, ipiv, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dgb_trans( LAPACK_COL_MAJOR, m, n, kl, kl+ku, ab_t, ldab_t, ab,
                           ldab );
        /* Release memory and exit */
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dgbtrf_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dgbtrf_work", info );
    }
    return info;
}