lapacke_zgesvd.c

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* Contents: Native high-level C interface to LAPACK function zgesvd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zgesvd( int matrix_layout, char jobu, char jobvt,
                           lapack_int m, lapack_int n, lapack_complex_double* a,
                           lapack_int lda, double* s, lapack_complex_double* u,
                           lapack_int ldu, lapack_complex_double* vt,
                           lapack_int ldvt, double* superb )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    double* rwork = NULL;
    lapack_complex_double* work = NULL;
    lapack_complex_double work_query;
    lapack_int i;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zgesvd", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_zge_nancheck( matrix_layout, m, n, a, lda ) ) {
            return -6;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    rwork = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,5*MIN(m,n)) );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_zgesvd_work( matrix_layout, jobu, jobvt, m, n, a, lda, s, u,
                                ldu, vt, ldvt, &work_query, lwork, rwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    lwork = LAPACK_Z2INT( work_query );
    /* Allocate memory for work arrays */
    work = (lapack_complex_double*)
        LAPACKE_malloc( sizeof(lapack_complex_double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_zgesvd_work( matrix_layout, jobu, jobvt, m, n, a, lda, s, u,
                                ldu, vt, ldvt, work, lwork, rwork );
    /* Backup significant data from working array(s) */
    for( i=0; i<MIN(m,n)-1; i++ ) {
        superb[i] = rwork[i];
    }
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( rwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_zgesvd", info );
    }
    return info;
}