lapacke_sbdsdc.c

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* Contents: Native high-level C interface to LAPACK function sbdsdc
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sbdsdc( int matrix_layout, char uplo, char compq,
                           lapack_int n, float* d, float* e, float* u,
                           lapack_int ldu, float* vt, lapack_int ldvt, float* q,
                           lapack_int* iq )
{
    lapack_int info = 0;
    /* Additional scalars declarations for work arrays */
    size_t lwork;
    lapack_int* iwork = NULL;
    float* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_sbdsdc", -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 -5;
        }
        if( LAPACKE_s_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 = (float*)LAPACKE_malloc( sizeof(float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_sbdsdc_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_sbdsdc", info );
    }
    return info;
}