sstebz_1.c

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/*  Contents: test routine for C interface to LAPACK
*   Author: Intel Corporation
*   Created in March, 2010
*
* Purpose
*
* sstebz_1 is the test program for the C interface to LAPACK
* routine sstebz
* The program doesn't require an input, the input data is hardcoded in the
* test program.
* The program tests the C interface in the four combinations:
*   1) column-major layout, middle-level interface
*   2) column-major layout, high-level interface
*   3) row-major layout, middle-level interface
*   4) row-major layout, high-level interface
* The output of the C interface function is compared to those obtained from
* the corresponiding LAPACK routine with the same input data, and the
* comparison diagnostics is then printed on the standard output having PASSED
* keyword if the test is passed, and FAILED keyword if the test isn't passed.
*****************************************************************************/
#include <stdio.h>
#include "lapacke.h"
#include "lapacke_utils.h"
#include "test_utils.h"

static void init_scalars_sstebz( char *range, char *order, lapack_int *n,
                                 float *vl, float *vu, lapack_int *il,
                                 lapack_int *iu, float *abstol );
static void init_d( lapack_int size, float *d );
static void init_e( lapack_int size, float *e );
static void init_w( lapack_int size, float *w );
static void init_iblock( lapack_int size, lapack_int *iblock );
static void init_isplit( lapack_int size, lapack_int *isplit );
static void init_work( lapack_int size, float *work );
static void init_iwork( lapack_int size, lapack_int *iwork );
static int compare_sstebz( lapack_int m, lapack_int m_i, lapack_int nsplit,
                           lapack_int nsplit_i, float *w, float *w_i,
                           lapack_int *iblock, lapack_int *iblock_i,
                           lapack_int *isplit, lapack_int *isplit_i,
                           lapack_int info, lapack_int info_i, lapack_int n );

int main(void)
{
    /* Local scalars */
    char range, range_i;
    char order, order_i;
    lapack_int n, n_i;
    float vl, vl_i;
    float vu, vu_i;
    lapack_int il, il_i;
    lapack_int iu, iu_i;
    float abstol, abstol_i;
    lapack_int m, m_i;
    lapack_int nsplit, nsplit_i;
    lapack_int info, info_i;
    lapack_int i;
    int failed;

    /* Local arrays */
    float *d = NULL, *d_i = NULL;
    float *e = NULL, *e_i = NULL;
    float *w = NULL, *w_i = NULL;
    lapack_int *iblock = NULL, *iblock_i = NULL;
    lapack_int *isplit = NULL, *isplit_i = NULL;
    float *work = NULL, *work_i = NULL;
    lapack_int *iwork = NULL, *iwork_i = NULL;
    float *w_save = NULL;
    lapack_int *iblock_save = NULL;
    lapack_int *isplit_save = NULL;

    /* Iniitialize the scalar parameters */
    init_scalars_sstebz( &range, &order, &n, &vl, &vu, &il, &iu, &abstol );
    range_i = range;
    order_i = order;
    n_i = n;
    vl_i = vl;
    vu_i = vu;
    il_i = il;
    iu_i = iu;
    abstol_i = abstol;

    /* Allocate memory for the LAPACK routine arrays */
    d = (float *)LAPACKE_malloc( n * sizeof(float) );
    e = (float *)LAPACKE_malloc( (n-1) * sizeof(float) );
    w = (float *)LAPACKE_malloc( n * sizeof(float) );
    iblock = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );
    isplit = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );
    work = (float *)LAPACKE_malloc( 4*n * sizeof(float) );
    iwork = (lapack_int *)LAPACKE_malloc( 3*n * sizeof(lapack_int) );

    /* Allocate memory for the C interface function arrays */
    d_i = (float *)LAPACKE_malloc( n * sizeof(float) );
    e_i = (float *)LAPACKE_malloc( (n-1) * sizeof(float) );
    w_i = (float *)LAPACKE_malloc( n * sizeof(float) );
    iblock_i = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );
    isplit_i = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );
    work_i = (float *)LAPACKE_malloc( 4*n * sizeof(float) );
    iwork_i = (lapack_int *)LAPACKE_malloc( 3*n * sizeof(lapack_int) );

    /* Allocate memory for the backup arrays */
    w_save = (float *)LAPACKE_malloc( n * sizeof(float) );
    iblock_save = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );
    isplit_save = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );

    /* Allocate memory for the row-major arrays */

    /* Initialize input arrays */
    init_d( n, d );
    init_e( (n-1), e );
    init_w( n, w );
    init_iblock( n, iblock );
    init_isplit( n, isplit );
    init_work( 4*n, work );
    init_iwork( 3*n, iwork );

    /* Backup the ouptut arrays */
    for( i = 0; i < n; i++ ) {
        w_save[i] = w[i];
    }
    for( i = 0; i < n; i++ ) {
        iblock_save[i] = iblock[i];
    }
    for( i = 0; i < n; i++ ) {
        isplit_save[i] = isplit[i];
    }

    /* Call the LAPACK routine */
    sstebz_( &range, &order, &n, &vl, &vu, &il, &iu, &abstol, d, e, &m, &nsplit,
             w, iblock, isplit, work, iwork, &info );

    /* Initialize input data, call the column-major middle-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < n; i++ ) {
        d_i[i] = d[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        e_i[i] = e[i];
    }
    for( i = 0; i < n; i++ ) {
        w_i[i] = w_save[i];
    }
    for( i = 0; i < n; i++ ) {
        iblock_i[i] = iblock_save[i];
    }
    for( i = 0; i < n; i++ ) {
        isplit_i[i] = isplit_save[i];
    }
    for( i = 0; i < 4*n; i++ ) {
        work_i[i] = work[i];
    }
    for( i = 0; i < 3*n; i++ ) {
        iwork_i[i] = iwork[i];
    }
    info_i = LAPACKE_sstebz_work( range_i, order_i, n_i, vl_i, vu_i, il_i, iu_i,
                                  abstol_i, d_i, e_i, &m_i, &nsplit_i, w_i,
                                  iblock_i, isplit_i, work_i, iwork_i );

    failed = compare_sstebz( m, m_i, nsplit, nsplit_i, w, w_i, iblock, iblock_i,
                             isplit, isplit_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major middle-level interface to sstebz\n" );
    } else {
        printf( "FAILED: column-major middle-level interface to sstebz\n" );
    }

    /* Initialize input data, call the column-major high-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < n; i++ ) {
        d_i[i] = d[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        e_i[i] = e[i];
    }
    for( i = 0; i < n; i++ ) {
        w_i[i] = w_save[i];
    }
    for( i = 0; i < n; i++ ) {
        iblock_i[i] = iblock_save[i];
    }
    for( i = 0; i < n; i++ ) {
        isplit_i[i] = isplit_save[i];
    }
    for( i = 0; i < 4*n; i++ ) {
        work_i[i] = work[i];
    }
    for( i = 0; i < 3*n; i++ ) {
        iwork_i[i] = iwork[i];
    }
    info_i = LAPACKE_sstebz( range_i, order_i, n_i, vl_i, vu_i, il_i, iu_i,
                             abstol_i, d_i, e_i, &m_i, &nsplit_i, w_i, iblock_i,
                             isplit_i );

    failed = compare_sstebz( m, m_i, nsplit, nsplit_i, w, w_i, iblock, iblock_i,
                             isplit, isplit_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major high-level interface to sstebz\n" );
    } else {
        printf( "FAILED: column-major high-level interface to sstebz\n" );
    }

    failed = compare_sstebz( m, m_i, nsplit, nsplit_i, w, w_i, iblock, iblock_i,
                             isplit, isplit_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major middle-level interface to sstebz\n" );
    } else {
        printf( "FAILED: row-major middle-level interface to sstebz\n" );
    }

    failed = compare_sstebz( m, m_i, nsplit, nsplit_i, w, w_i, iblock, iblock_i,
                             isplit, isplit_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major high-level interface to sstebz\n" );
    } else {
        printf( "FAILED: row-major high-level interface to sstebz\n" );
    }

    /* Release memory */
    if( d != NULL ) {
        LAPACKE_free( d );
    }
    if( d_i != NULL ) {
        LAPACKE_free( d_i );
    }
    if( e != NULL ) {
        LAPACKE_free( e );
    }
    if( e_i != NULL ) {
        LAPACKE_free( e_i );
    }
    if( w != NULL ) {
        LAPACKE_free( w );
    }
    if( w_i != NULL ) {
        LAPACKE_free( w_i );
    }
    if( w_save != NULL ) {
        LAPACKE_free( w_save );
    }
    if( iblock != NULL ) {
        LAPACKE_free( iblock );
    }
    if( iblock_i != NULL ) {
        LAPACKE_free( iblock_i );
    }
    if( iblock_save != NULL ) {
        LAPACKE_free( iblock_save );
    }
    if( isplit != NULL ) {
        LAPACKE_free( isplit );
    }
    if( isplit_i != NULL ) {
        LAPACKE_free( isplit_i );
    }
    if( isplit_save != NULL ) {
        LAPACKE_free( isplit_save );
    }
    if( work != NULL ) {
        LAPACKE_free( work );
    }
    if( work_i != NULL ) {
        LAPACKE_free( work_i );
    }
    if( iwork != NULL ) {
        LAPACKE_free( iwork );
    }
    if( iwork_i != NULL ) {
        LAPACKE_free( iwork_i );
    }

    return 0;
}

/* Auxiliary function: sstebz scalar parameters initialization */
static void init_scalars_sstebz( char *range, char *order, lapack_int *n,
                                 float *vl, float *vu, lapack_int *il,
                                 lapack_int *iu, float *abstol )
{
    *range = 'I';
    *order = 'B';
    *n = 4;
    *vl = 0.000000000e+000;
    *vu = 0.000000000e+000;
    *il = 1;
    *iu = 2;
    *abstol = 0.000000000e+000;

    return;
}

/* Auxiliary functions: sstebz array parameters initialization */
static void init_d( lapack_int size, float *d ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        d[i] = 0;
    }
    d[0] = -2.279999971e+000;
    d[1] = -1.284568310e-001;
    d[2] = -1.665935516e-001;
    d[3] = -1.924949646e+000;
}
static void init_e( lapack_int size, float *e ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        e[i] = 0;
    }
    e[0] = -4.338455677e+000;
    e[1] = -2.022594690e+000;
    e[2] = -1.802322745e+000;
}
static void init_w( lapack_int size, float *w ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        w[i] = 0;
    }
}
static void init_iblock( lapack_int size, lapack_int *iblock ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        iblock[i] = 0;
    }
}
static void init_isplit( lapack_int size, lapack_int *isplit ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        isplit[i] = 0;
    }
}
static void init_work( lapack_int size, float *work ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        work[i] = 0;
    }
}
static void init_iwork( lapack_int size, lapack_int *iwork ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        iwork[i] = 0;
    }
}

/* Auxiliary function: C interface to sstebz results check */
/* Return value: 0 - test is passed, non-zero - test is failed */
static int compare_sstebz( lapack_int m, lapack_int m_i, lapack_int nsplit,
                           lapack_int nsplit_i, float *w, float *w_i,
                           lapack_int *iblock, lapack_int *iblock_i,
                           lapack_int *isplit, lapack_int *isplit_i,
                           lapack_int info, lapack_int info_i, lapack_int n )
{
    lapack_int i;
    int failed = 0;
    failed += (m == m_i) ? 0 : 1;
    failed += (nsplit == nsplit_i) ? 0 : 1;
    for( i = 0; i < n; i++ ) {
        failed += compare_floats(w[i],w_i[i]);
    }
    for( i = 0; i < n; i++ ) {
        failed += (iblock[i] == iblock_i[i]) ? 0 : 1;
    }
    for( i = 0; i < n; i++ ) {
        failed += (isplit[i] == isplit_i[i]) ? 0 : 1;
    }
    failed += (info == info_i) ? 0 : 1;
    if( info != 0 || info_i != 0 ) {
        printf( "info=%d, info_i=%d\n",(int)info,(int)info_i );
    }

    return failed;
}