lapacke_dstein_work.c

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* Contents: Native middle-level C interface to LAPACK function dstein
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dstein_work( int matrix_layout, lapack_int n, const double* d,
                                const double* e, lapack_int m, const double* w,
                                const lapack_int* iblock,
                                const lapack_int* isplit, double* z,
                                lapack_int ldz, double* work, lapack_int* iwork,
                                lapack_int* ifailv )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dstein( &n, d, e, &m, w, iblock, isplit, z, &ldz, work, iwork,
                       ifailv, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldz_t = MAX(1,n);
        double* z_t = NULL;
        /* Check leading dimension(s) */
        if( ldz < m ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_dstein_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,m) );
        if( z_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        /* Call LAPACK function and adjust info */
        LAPACK_dstein( &n, d, e, &m, w, iblock, isplit, z_t, &ldz_t, work,
                       iwork, ifailv, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, m, z_t, ldz_t, z, ldz );
        /* Release memory and exit */
        LAPACKE_free( z_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dstein_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dstein_work", info );
    }
    return info;
}