lapacke_cstedc.c

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* Contents: Native high-level C interface to LAPACK function cstedc
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_cstedc( int matrix_layout, char compz, lapack_int n, float* d,
                           float* e, lapack_complex_float* z, lapack_int ldz )
{
    lapack_int info = 0;
    lapack_int liwork = -1;
    lapack_int lrwork = -1;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    float* rwork = NULL;
    lapack_complex_float* work = NULL;
    lapack_int iwork_query;
    float rwork_query;
    lapack_complex_float work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_cstedc", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_s_nancheck( n, d, 1 ) ) {
            return -4;
        }
        if( LAPACKE_s_nancheck( n-1, e, 1 ) ) {
            return -5;
        }
        if( LAPACKE_lsame( compz, 'v' ) ) {
            if( LAPACKE_cge_nancheck( matrix_layout, n, n, z, ldz ) ) {
                return -6;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_cstedc_work( matrix_layout, compz, n, d, e, z, ldz,
                                &work_query, lwork, &rwork_query, lrwork,
                                &iwork_query, liwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    liwork = iwork_query;
    lrwork = (lapack_int)rwork_query;
    lwork = LAPACK_C2INT( work_query );
    /* Allocate memory for work arrays */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    rwork = (float*)LAPACKE_malloc( sizeof(float) * lrwork );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    work = (lapack_complex_float*)
        LAPACKE_malloc( sizeof(lapack_complex_float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_2;
    }
    /* Call middle-level interface */
    info = LAPACKE_cstedc_work( matrix_layout, compz, n, d, e, z, ldz, work,
                                lwork, rwork, lrwork, iwork, liwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_2:
    LAPACKE_free( rwork );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_cstedc", info );
    }
    return info;
}