sgebak_1.c

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/*  Contents: test routine for C interface to LAPACK
*   Author: Intel Corporation
*   Created in March, 2010
*
* Purpose
*
* sgebak_1 is the test program for the C interface to LAPACK
* routine sgebak
* 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_sgebak( char *job, char *side, lapack_int *n,
                                 lapack_int *ilo, lapack_int *ihi,
                                 lapack_int *m, lapack_int *ldv );
static void init_scale( lapack_int size, float *scale );
static void init_v( lapack_int size, float *v );
static int compare_sgebak( float *v, float *v_i, lapack_int info,
                           lapack_int info_i, lapack_int ldv, lapack_int m );

int main(void)
{
    /* Local scalars */
    char job, job_i;
    char side, side_i;
    lapack_int n, n_i;
    lapack_int ilo, ilo_i;
    lapack_int ihi, ihi_i;
    lapack_int m, m_i;
    lapack_int ldv, ldv_i;
    lapack_int ldv_r;
    lapack_int info, info_i;
    lapack_int i;
    int failed;

    /* Local arrays */
    float *scale = NULL, *scale_i = NULL;
    float *v = NULL, *v_i = NULL;
    float *v_save = NULL;
    float *v_r = NULL;

    /* Iniitialize the scalar parameters */
    init_scalars_sgebak( &job, &side, &n, &ilo, &ihi, &m, &ldv );
    ldv_r = m+2;
    job_i = job;
    side_i = side;
    n_i = n;
    ilo_i = ilo;
    ihi_i = ihi;
    m_i = m;
    ldv_i = ldv;

    /* Allocate memory for the LAPACK routine arrays */
    scale = (float *)LAPACKE_malloc( n * sizeof(float) );
    v = (float *)LAPACKE_malloc( ldv*m * sizeof(float) );

    /* Allocate memory for the C interface function arrays */
    scale_i = (float *)LAPACKE_malloc( n * sizeof(float) );
    v_i = (float *)LAPACKE_malloc( ldv*m * sizeof(float) );

    /* Allocate memory for the backup arrays */
    v_save = (float *)LAPACKE_malloc( ldv*m * sizeof(float) );

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

    /* Initialize input arrays */
    init_scale( n, scale );
    init_v( ldv*m, v );

    /* Backup the ouptut arrays */
    for( i = 0; i < ldv*m; i++ ) {
        v_save[i] = v[i];
    }

    /* Call the LAPACK routine */
    sgebak_( &job, &side, &n, &ilo, &ihi, scale, &m, v, &ldv, &info );

    /* Initialize input data, call the column-major middle-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < n; i++ ) {
        scale_i[i] = scale[i];
    }
    for( i = 0; i < ldv*m; i++ ) {
        v_i[i] = v_save[i];
    }
    info_i = LAPACKE_sgebak_work( LAPACK_COL_MAJOR, job_i, side_i, n_i, ilo_i,
                                  ihi_i, scale_i, m_i, v_i, ldv_i );

    failed = compare_sgebak( v, v_i, info, info_i, ldv, m );
    if( failed == 0 ) {
        printf( "PASSED: column-major middle-level interface to sgebak\n" );
    } else {
        printf( "FAILED: column-major middle-level interface to sgebak\n" );
    }

    /* Initialize input data, call the column-major high-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < n; i++ ) {
        scale_i[i] = scale[i];
    }
    for( i = 0; i < ldv*m; i++ ) {
        v_i[i] = v_save[i];
    }
    info_i = LAPACKE_sgebak( LAPACK_COL_MAJOR, job_i, side_i, n_i, ilo_i, ihi_i,
                             scale_i, m_i, v_i, ldv_i );

    failed = compare_sgebak( v, v_i, info, info_i, ldv, m );
    if( failed == 0 ) {
        printf( "PASSED: column-major high-level interface to sgebak\n" );
    } else {
        printf( "FAILED: column-major high-level interface to sgebak\n" );
    }

    /* Initialize input data, call the row-major middle-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < n; i++ ) {
        scale_i[i] = scale[i];
    }
    for( i = 0; i < ldv*m; i++ ) {
        v_i[i] = v_save[i];
    }

    LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, m, v_i, ldv, v_r, m+2 );
    info_i = LAPACKE_sgebak_work( LAPACK_ROW_MAJOR, job_i, side_i, n_i, ilo_i,
                                  ihi_i, scale_i, m_i, v_r, ldv_r );

    LAPACKE_sge_trans( LAPACK_ROW_MAJOR, n, m, v_r, m+2, v_i, ldv );

    failed = compare_sgebak( v, v_i, info, info_i, ldv, m );
    if( failed == 0 ) {
        printf( "PASSED: row-major middle-level interface to sgebak\n" );
    } else {
        printf( "FAILED: row-major middle-level interface to sgebak\n" );
    }

    /* Initialize input data, call the row-major high-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < n; i++ ) {
        scale_i[i] = scale[i];
    }
    for( i = 0; i < ldv*m; i++ ) {
        v_i[i] = v_save[i];
    }

    /* Init row_major arrays */
    LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, m, v_i, ldv, v_r, m+2 );
    info_i = LAPACKE_sgebak( LAPACK_ROW_MAJOR, job_i, side_i, n_i, ilo_i, ihi_i,
                             scale_i, m_i, v_r, ldv_r );

    LAPACKE_sge_trans( LAPACK_ROW_MAJOR, n, m, v_r, m+2, v_i, ldv );

    failed = compare_sgebak( v, v_i, info, info_i, ldv, m );
    if( failed == 0 ) {
        printf( "PASSED: row-major high-level interface to sgebak\n" );
    } else {
        printf( "FAILED: row-major high-level interface to sgebak\n" );
    }

    /* Release memory */
    if( scale != NULL ) {
        LAPACKE_free( scale );
    }
    if( scale_i != NULL ) {
        LAPACKE_free( scale_i );
    }
    if( v != NULL ) {
        LAPACKE_free( v );
    }
    if( v_i != NULL ) {
        LAPACKE_free( v_i );
    }
    if( v_r != NULL ) {
        LAPACKE_free( v_r );
    }
    if( v_save != NULL ) {
        LAPACKE_free( v_save );
    }

    return 0;
}

/* Auxiliary function: sgebak scalar parameters initialization */
static void init_scalars_sgebak( char *job, char *side, lapack_int *n,
                                 lapack_int *ilo, lapack_int *ihi,
                                 lapack_int *m, lapack_int *ldv )
{
    *job = 'B';
    *side = 'R';
    *n = 4;
    *ilo = 2;
    *ihi = 4;
    *m = 4;
    *ldv = 8;

    return;
}

/* Auxiliary functions: sgebak array parameters initialization */
static void init_scale( lapack_int size, float *scale ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        scale[i] = 0;
    }
    scale[0] = 3.000000000e+000;
    scale[1] = 4.000000000e+000;
    scale[2] = 4.000000000e+000;
    scale[3] = 5.000000000e-001;
}
static void init_v( lapack_int size, float *v ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        v[i] = 0;
    }
    v[0] = 1.000000000e+000;  /* v[0,0] */
    v[8] = 2.157093138e-001;  /* v[0,1] */
    v[16] = 1.000000000e+000;  /* v[0,2] */
    v[24] = -9.999999404e-001;  /* v[0,3] */
    v[1] = 0.000000000e+000;  /* v[1,0] */
    v[9] = -1.000000000e+000;  /* v[1,1] */
    v[17] = 4.953082502e-001;  /* v[1,2] */
    v[25] = 1.718333215e-001;  /* v[1,3] */
    v[2] = 0.000000000e+000;  /* v[2,0] */
    v[10] = 4.910063446e-001;  /* v[2,1] */
    v[18] = 2.922107875e-001;  /* v[2,2] */
    v[26] = -9.537314773e-001;  /* v[2,3] */
    v[3] = 0.000000000e+000;  /* v[3,0] */
    v[11] = 8.751223683e-001;  /* v[3,1] */
    v[19] = 2.614878118e-001;  /* v[3,2] */
    v[27] = 4.724877477e-001;  /* v[3,3] */
}

/* Auxiliary function: C interface to sgebak results check */
/* Return value: 0 - test is passed, non-zero - test is failed */
static int compare_sgebak( float *v, float *v_i, lapack_int info,
                           lapack_int info_i, lapack_int ldv, lapack_int m )
{
    lapack_int i;
    int failed = 0;
    for( i = 0; i < ldv*m; i++ ) {
        failed += compare_floats(v[i],v_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;
}