ssterf_2.c

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/*  Contents: test routine for C interface to LAPACK
*   Author: Intel Corporation
*   Created in March, 2010
*
* Purpose
*
* ssterf_2 is the test program for the C interface to LAPACK
* routine ssterf
* 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_ssterf( lapack_int *n );
static void init_d( lapack_int size, float *d );
static void init_e( lapack_int size, float *e );
static int compare_ssterf( float *d, float *d_i, float *e, float *e_i,
                           lapack_int info, lapack_int info_i, lapack_int n );

int main(void)
{
    /* Local scalars */
    lapack_int n, n_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 *d_save = NULL;
    float *e_save = NULL;

    /* Iniitialize the scalar parameters */
    init_scalars_ssterf( &n );
    n_i = n;

    /* Allocate memory for the LAPACK routine arrays */
    d = (float *)LAPACKE_malloc( n * sizeof(float) );
    e = (float *)LAPACKE_malloc( (n-1) * sizeof(float) );

    /* 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) );

    /* Allocate memory for the backup arrays */
    d_save = (float *)LAPACKE_malloc( n * sizeof(float) );
    e_save = (float *)LAPACKE_malloc( (n-1) * sizeof(float) );

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

    /* Initialize input arrays */
    init_d( n, d );
    init_e( (n-1), e );

    /* Backup the ouptut arrays */
    for( i = 0; i < n; i++ ) {
        d_save[i] = d[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        e_save[i] = e[i];
    }

    /* Call the LAPACK routine */
    ssterf_( &n, d, e, &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_save[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        e_i[i] = e_save[i];
    }
    info_i = LAPACKE_ssterf_work( n_i, d_i, e_i );

    failed = compare_ssterf( d, d_i, e, e_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major middle-level interface to ssterf\n" );
    } else {
        printf( "FAILED: column-major middle-level interface to ssterf\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_save[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        e_i[i] = e_save[i];
    }
    info_i = LAPACKE_ssterf( n_i, d_i, e_i );

    failed = compare_ssterf( d, d_i, e, e_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major high-level interface to ssterf\n" );
    } else {
        printf( "FAILED: column-major high-level interface to ssterf\n" );
    }

    failed = compare_ssterf( d, d_i, e, e_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major middle-level interface to ssterf\n" );
    } else {
        printf( "FAILED: row-major middle-level interface to ssterf\n" );
    }

    failed = compare_ssterf( d, d_i, e, e_i, info, info_i, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major high-level interface to ssterf\n" );
    } else {
        printf( "FAILED: row-major high-level interface to ssterf\n" );
    }

    /* Release memory */
    if( d != NULL ) {
        LAPACKE_free( d );
    }
    if( d_i != NULL ) {
        LAPACKE_free( d_i );
    }
    if( d_save != NULL ) {
        LAPACKE_free( d_save );
    }
    if( e != NULL ) {
        LAPACKE_free( e );
    }
    if( e_i != NULL ) {
        LAPACKE_free( e_i );
    }
    if( e_save != NULL ) {
        LAPACKE_free( e_save );
    }

    return 0;
}

/* Auxiliary function: ssterf scalar parameters initialization */
static void init_scalars_ssterf( lapack_int *n )
{
    *n = 4;

    return;
}

/* Auxiliary functions: ssterf 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] = -2.278637648e+000;
    d[1] = -1.334985495e-001;
    d[2] = -1.463528872e-001;
    d[3] = -1.930385590e+000;
}
static void init_e( lapack_int size, float *e ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        e[i] = 0;
    }
    e[0] = -4.337746620e+000;
    e[1] = -2.022518158e+000;
    e[2] = -1.792322278e+000;
}

/* Auxiliary function: C interface to ssterf results check */
/* Return value: 0 - test is passed, non-zero - test is failed */
static int compare_ssterf( float *d, float *d_i, float *e, float *e_i,
                           lapack_int info, lapack_int info_i, lapack_int n )
{
    lapack_int i;
    int failed = 0;
    for( i = 0; i < n; i++ ) {
        failed += compare_floats(d[i],d_i[i]);
    }
    for( i = 0; i < (n-1); i++ ) {
        failed += compare_floats(e[i],e_i[i]);
    }
    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;
}