lapacke_zgesdd.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_zgesdd (int matrix_layout, char jobz, 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)

Function Documentation

LAPACKE_zgesdd()

lapack_int LAPACKE_zgesdd	(	int	matrix_layout,
		char	jobz,
		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 )

Definition at line 35 of file lapacke_zgesdd.c.

{
    lapack_int info = 0;
    lapack_int lwork = -1;
    /* Additional scalars declarations for work arrays */
    size_t lrwork;
    lapack_int* iwork = NULL;
    double* rwork = NULL;
    lapack_complex_double* work = NULL;
    lapack_complex_double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zgesdd", -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 -5;
        }
    }
#endif
    /* Additional scalars initializations for work arrays */
    if( LAPACKE_lsame( jobz, 'n' ) ) {
        lrwork = MAX(1,7*MIN(m,n));
    } else {
        lrwork = (size_t)MAX(1,MIN(m,n)*MAX(5*MIN(m,n)+7,2*MAX(m,n)+2*MIN(m,n)+1));
    }
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)
        LAPACKE_malloc( sizeof(lapack_int) * MAX(1,8*MIN(m,n)) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    rwork = (double*)LAPACKE_malloc( sizeof(double) * lrwork );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_zgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
                                ldvt, &work_query, lwork, rwork, iwork );
    if( info != 0 ) {
        goto exit_level_2;
    }
    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_2;
    }
    /* Call middle-level interface */
    info = LAPACKE_zgesdd_work( matrix_layout, jobz, m, n, a, lda, s, u, ldu, vt,
                                ldvt, work, lwork, rwork, iwork );
    /* 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_zgesdd", info );
    }
    return info;
}