stbcon_1.c

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/*  Contents: test routine for C interface to LAPACK
*   Author: Intel Corporation
*   Created in March, 2010
*
* Purpose
*
* stbcon_1 is the test program for the C interface to LAPACK
* routine stbcon
* 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_stbcon( char *norm, char *uplo, char *diag,
                                 lapack_int *n, lapack_int *kd,
                                 lapack_int *ldab );
static void init_ab( lapack_int size, float *ab );
static void init_work( lapack_int size, float *work );
static void init_iwork( lapack_int size, lapack_int *iwork );
static int compare_stbcon( float rcond, float rcond_i, lapack_int info,
                           lapack_int info_i );

int main(void)
{
    /* Local scalars */
    char norm, norm_i;
    char uplo, uplo_i;
    char diag, diag_i;
    lapack_int n, n_i;
    lapack_int kd, kd_i;
    lapack_int ldab, ldab_i;
    lapack_int ldab_r;
    float rcond, rcond_i;
    lapack_int info, info_i;
    lapack_int i;
    int failed;

    /* Local arrays */
    float *ab = NULL, *ab_i = NULL;
    float *work = NULL, *work_i = NULL;
    lapack_int *iwork = NULL, *iwork_i = NULL;
    float *ab_r = NULL;

    /* Iniitialize the scalar parameters */
    init_scalars_stbcon( &norm, &uplo, &diag, &n, &kd, &ldab );
    ldab_r = n+2;
    norm_i = norm;
    uplo_i = uplo;
    diag_i = diag;
    n_i = n;
    kd_i = kd;
    ldab_i = ldab;

    /* Allocate memory for the LAPACK routine arrays */
    ab = (float *)LAPACKE_malloc( ldab*n * sizeof(float) );
    work = (float *)LAPACKE_malloc( 3*n * sizeof(float) );
    iwork = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );

    /* Allocate memory for the C interface function arrays */
    ab_i = (float *)LAPACKE_malloc( ldab*n * sizeof(float) );
    work_i = (float *)LAPACKE_malloc( 3*n * sizeof(float) );
    iwork_i = (lapack_int *)LAPACKE_malloc( n * sizeof(lapack_int) );

    /* Allocate memory for the row-major arrays */
    ab_r = (float *)LAPACKE_malloc( (kd+1)*(n+2) * sizeof(float) );

    /* Initialize input arrays */
    init_ab( ldab*n, ab );
    init_work( 3*n, work );
    init_iwork( n, iwork );

    /* Call the LAPACK routine */
    stbcon_( &norm, &uplo, &diag, &n, &kd, ab, &ldab, &rcond, work, iwork,
             &info );

    /* Initialize input data, call the column-major middle-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < ldab*n; i++ ) {
        ab_i[i] = ab[i];
    }
    for( i = 0; i < 3*n; i++ ) {
        work_i[i] = work[i];
    }
    for( i = 0; i < n; i++ ) {
        iwork_i[i] = iwork[i];
    }
    info_i = LAPACKE_stbcon_work( LAPACK_COL_MAJOR, norm_i, uplo_i, diag_i, n_i,
                                  kd_i, ab_i, ldab_i, &rcond_i, work_i,
                                  iwork_i );

    failed = compare_stbcon( rcond, rcond_i, info, info_i );
    if( failed == 0 ) {
        printf( "PASSED: column-major middle-level interface to stbcon\n" );
    } else {
        printf( "FAILED: column-major middle-level interface to stbcon\n" );
    }

    /* Initialize input data, call the column-major high-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < ldab*n; i++ ) {
        ab_i[i] = ab[i];
    }
    for( i = 0; i < 3*n; i++ ) {
        work_i[i] = work[i];
    }
    for( i = 0; i < n; i++ ) {
        iwork_i[i] = iwork[i];
    }
    info_i = LAPACKE_stbcon( LAPACK_COL_MAJOR, norm_i, uplo_i, diag_i, n_i,
                             kd_i, ab_i, ldab_i, &rcond_i );

    failed = compare_stbcon( rcond, rcond_i, info, info_i );
    if( failed == 0 ) {
        printf( "PASSED: column-major high-level interface to stbcon\n" );
    } else {
        printf( "FAILED: column-major high-level interface to stbcon\n" );
    }

    /* Initialize input data, call the row-major middle-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < ldab*n; i++ ) {
        ab_i[i] = ab[i];
    }
    for( i = 0; i < 3*n; i++ ) {
        work_i[i] = work[i];
    }
    for( i = 0; i < n; i++ ) {
        iwork_i[i] = iwork[i];
    }

    LAPACKE_sge_trans( LAPACK_COL_MAJOR, kd+1, n, ab_i, ldab, ab_r, n+2 );
    info_i = LAPACKE_stbcon_work( LAPACK_ROW_MAJOR, norm_i, uplo_i, diag_i, n_i,
                                  kd_i, ab_r, ldab_r, &rcond_i, work_i,
                                  iwork_i );

    failed = compare_stbcon( rcond, rcond_i, info, info_i );
    if( failed == 0 ) {
        printf( "PASSED: row-major middle-level interface to stbcon\n" );
    } else {
        printf( "FAILED: row-major middle-level interface to stbcon\n" );
    }

    /* Initialize input data, call the row-major high-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < ldab*n; i++ ) {
        ab_i[i] = ab[i];
    }
    for( i = 0; i < 3*n; i++ ) {
        work_i[i] = work[i];
    }
    for( i = 0; i < n; i++ ) {
        iwork_i[i] = iwork[i];
    }

    /* Init row_major arrays */
    LAPACKE_sge_trans( LAPACK_COL_MAJOR, kd+1, n, ab_i, ldab, ab_r, n+2 );
    info_i = LAPACKE_stbcon( LAPACK_ROW_MAJOR, norm_i, uplo_i, diag_i, n_i,
                             kd_i, ab_r, ldab_r, &rcond_i );

    failed = compare_stbcon( rcond, rcond_i, info, info_i );
    if( failed == 0 ) {
        printf( "PASSED: row-major high-level interface to stbcon\n" );
    } else {
        printf( "FAILED: row-major high-level interface to stbcon\n" );
    }

    /* Release memory */
    if( ab != NULL ) {
        LAPACKE_free( ab );
    }
    if( ab_i != NULL ) {
        LAPACKE_free( ab_i );
    }
    if( ab_r != NULL ) {
        LAPACKE_free( ab_r );
    }
    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: stbcon scalar parameters initialization */
static void init_scalars_stbcon( char *norm, char *uplo, char *diag,
                                 lapack_int *n, lapack_int *kd,
                                 lapack_int *ldab )
{
    *norm = '1';
    *uplo = 'L';
    *diag = 'N';
    *n = 4;
    *kd = 1;
    *ldab = 9;

    return;
}

/* Auxiliary functions: stbcon array parameters initialization */
static void init_ab( lapack_int size, float *ab ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        ab[i] = 0;
    }
    ab[0] = -4.159999847e+000;  /* ab[0,0] */
    ab[9] = 4.780000210e+000;  /* ab[0,1] */
    ab[18] = 6.320000172e+000;  /* ab[0,2] */
    ab[27] = 1.599999964e-001;  /* ab[0,3] */
    ab[1] = -2.250000000e+000;  /* ab[1,0] */
    ab[10] = 5.860000134e+000;  /* ab[1,1] */
    ab[19] = -4.820000172e+000;  /* ab[1,2] */
    ab[28] = 0.000000000e+000;  /* ab[1,3] */
}
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 stbcon results check */
/* Return value: 0 - test is passed, non-zero - test is failed */
static int compare_stbcon( float rcond, float rcond_i, lapack_int info,
                           lapack_int info_i )
{
    int failed = 0;
    failed += compare_floats(rcond,rcond_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;
}