dpbtrf_1.c

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/*  Contents: test routine for C interface to LAPACK
*   Author: Intel Corporation
*   Created in March, 2010
*
* Purpose
*
* dpbtrf_1 is the test program for the C interface to LAPACK
* routine dpbtrf
* 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_dpbtrf( char *uplo, lapack_int *n, lapack_int *kd,
                                 lapack_int *ldab );
static void init_ab( lapack_int size, double *ab );
static int compare_dpbtrf( double *ab, double *ab_i, lapack_int info,
                           lapack_int info_i, lapack_int ldab, lapack_int n );

int main(void)
{
    /* Local scalars */
    char uplo, uplo_i;
    lapack_int n, n_i;
    lapack_int kd, kd_i;
    lapack_int ldab, ldab_i;
    lapack_int ldab_r;
    lapack_int info, info_i;
    lapack_int i;
    int failed;

    /* Local arrays */
    double *ab = NULL, *ab_i = NULL;
    double *ab_save = NULL;
    double *ab_r = NULL;

    /* Iniitialize the scalar parameters */
    init_scalars_dpbtrf( &uplo, &n, &kd, &ldab );
    ldab_r = n+2;
    uplo_i = uplo;
    n_i = n;
    kd_i = kd;
    ldab_i = ldab;

    /* Allocate memory for the LAPACK routine arrays */
    ab = (double *)LAPACKE_malloc( ldab*n * sizeof(double) );

    /* Allocate memory for the C interface function arrays */
    ab_i = (double *)LAPACKE_malloc( ldab*n * sizeof(double) );

    /* Allocate memory for the backup arrays */
    ab_save = (double *)LAPACKE_malloc( ldab*n * sizeof(double) );

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

    /* Initialize input arrays */
    init_ab( ldab*n, ab );

    /* Backup the ouptut arrays */
    for( i = 0; i < ldab*n; i++ ) {
        ab_save[i] = ab[i];
    }

    /* Call the LAPACK routine */
    dpbtrf_( &uplo, &n, &kd, ab, &ldab, &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_save[i];
    }
    info_i = LAPACKE_dpbtrf_work( LAPACK_COL_MAJOR, uplo_i, n_i, kd_i, ab_i,
                                  ldab_i );

    failed = compare_dpbtrf( ab, ab_i, info, info_i, ldab, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major middle-level interface to dpbtrf\n" );
    } else {
        printf( "FAILED: column-major middle-level interface to dpbtrf\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_save[i];
    }
    info_i = LAPACKE_dpbtrf( LAPACK_COL_MAJOR, uplo_i, n_i, kd_i, ab_i,
                             ldab_i );

    failed = compare_dpbtrf( ab, ab_i, info, info_i, ldab, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major high-level interface to dpbtrf\n" );
    } else {
        printf( "FAILED: column-major high-level interface to dpbtrf\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_save[i];
    }

    LAPACKE_dge_trans( LAPACK_COL_MAJOR, kd+1, n, ab_i, ldab, ab_r, n+2 );
    info_i = LAPACKE_dpbtrf_work( LAPACK_ROW_MAJOR, uplo_i, n_i, kd_i, ab_r,
                                  ldab_r );

    LAPACKE_dge_trans( LAPACK_ROW_MAJOR, kd+1, n, ab_r, n+2, ab_i, ldab );

    failed = compare_dpbtrf( ab, ab_i, info, info_i, ldab, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major middle-level interface to dpbtrf\n" );
    } else {
        printf( "FAILED: row-major middle-level interface to dpbtrf\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_save[i];
    }

    /* Init row_major arrays */
    LAPACKE_dge_trans( LAPACK_COL_MAJOR, kd+1, n, ab_i, ldab, ab_r, n+2 );
    info_i = LAPACKE_dpbtrf( LAPACK_ROW_MAJOR, uplo_i, n_i, kd_i, ab_r,
                             ldab_r );

    LAPACKE_dge_trans( LAPACK_ROW_MAJOR, kd+1, n, ab_r, n+2, ab_i, ldab );

    failed = compare_dpbtrf( ab, ab_i, info, info_i, ldab, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major high-level interface to dpbtrf\n" );
    } else {
        printf( "FAILED: row-major high-level interface to dpbtrf\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( ab_save != NULL ) {
        LAPACKE_free( ab_save );
    }

    return 0;
}

/* Auxiliary function: dpbtrf scalar parameters initialization */
static void init_scalars_dpbtrf( char *uplo, lapack_int *n, lapack_int *kd,
                                 lapack_int *ldab )
{
    *uplo = 'L';
    *n = 4;
    *kd = 1;
    *ldab = 9;

    return;
}

/* Auxiliary functions: dpbtrf array parameters initialization */
static void init_ab( lapack_int size, double *ab ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        ab[i] = 0;
    }
    ab[0] = 5.49000000000000020e+000;  /* ab[0,0] */
    ab[9] = 5.62999999999999990e+000;  /* ab[0,1] */
    ab[18] = 2.60000000000000010e+000;  /* ab[0,2] */
    ab[27] = 5.16999999999999990e+000;  /* ab[0,3] */
    ab[1] = 2.68000000000000020e+000;  /* ab[1,0] */
    ab[10] = -2.39000000000000010e+000;  /* ab[1,1] */
    ab[19] = -2.22000000000000020e+000;  /* ab[1,2] */
    ab[28] = 0.00000000000000000e+000;  /* ab[1,3] */
}

/* Auxiliary function: C interface to dpbtrf results check */
/* Return value: 0 - test is passed, non-zero - test is failed */
static int compare_dpbtrf( double *ab, double *ab_i, lapack_int info,
                           lapack_int info_i, lapack_int ldab, lapack_int n )
{
    lapack_int i;
    int failed = 0;
    for( i = 0; i < ldab*n; i++ ) {
        failed += compare_doubles(ab[i],ab_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;
}