lapacke_dbdsdc.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_dbdsdc (int matrix_layout, char uplo, char compq, lapack_int n, double *d, double *e, double *u, lapack_int ldu, double *vt, lapack_int ldvt, double *q, lapack_int *iq)

Function Documentation

LAPACKE_dbdsdc()

lapack_int LAPACKE_dbdsdc	(	int	matrix_layout,
		char	uplo,
		char	compq,
		lapack_int	n,
		double *	d,
		double *	e,
		double *	u,
		lapack_int	ldu,
		double *	vt,
		lapack_int	ldvt,
		double *	q,
		lapack_int *	iq )

Definition at line 35 of file lapacke_dbdsdc.c.

{
    lapack_int info = 0;
    /* Additional scalars declarations for work arrays */
    size_t lwork;
    lapack_int* iwork = NULL;
    double* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dbdsdc", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_d_nancheck( n, d, 1 ) ) {
            return -5;
        }
        if( LAPACKE_d_nancheck( n-1, e, 1 ) ) {
            return -6;
        }
    }
#endif
    /* Additional scalars initializations for work arrays */
    if( LAPACKE_lsame( compq, 'i' ) ) {
        lwork = (size_t)3*MAX(1,n)*MAX(1,n)+4*MAX(1,n);
    } else if( LAPACKE_lsame( compq, 'p' ) ) {
        lwork = MAX(1,6*n);
    } else if( LAPACKE_lsame( compq, 'n' ) ) {
        lwork = MAX(1,4*n);
    } else {
        lwork = 1; /* Any value */
    }
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,8*n) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_dbdsdc_work( matrix_layout, uplo, compq, n, d, e, u, ldu, vt,
                                ldvt, q, iq, work, iwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dbdsdc", info );
    }
    return info;
}