dgehrd_3.c

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/*  Contents: test routine for C interface to LAPACK
*   Author: Intel Corporation
*   Created in March, 2010
*
* Purpose
*
* dgehrd_3 is the test program for the C interface to LAPACK
* routine dgehrd
* 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_dgehrd( lapack_int *n, lapack_int *ilo,
                                 lapack_int *ihi, lapack_int *lda,
                                 lapack_int *lwork );
static void init_a( lapack_int size, double *a );
static void init_tau( lapack_int size, double *tau );
static void init_work( lapack_int size, double *work );
static int compare_dgehrd( double *a, double *a_i, double *tau, double *tau_i,
                           lapack_int info, lapack_int info_i, lapack_int lda,
                           lapack_int n );

int main(void)
{
    /* Local scalars */
    lapack_int n, n_i;
    lapack_int ilo, ilo_i;
    lapack_int ihi, ihi_i;
    lapack_int lda, lda_i;
    lapack_int lda_r;
    lapack_int lwork, lwork_i;
    lapack_int info, info_i;
    lapack_int i;
    int failed;

    /* Local arrays */
    double *a = NULL, *a_i = NULL;
    double *tau = NULL, *tau_i = NULL;
    double *work = NULL, *work_i = NULL;
    double *a_save = NULL;
    double *tau_save = NULL;
    double *a_r = NULL;

    /* Iniitialize the scalar parameters */
    init_scalars_dgehrd( &n, &ilo, &ihi, &lda, &lwork );
    lda_r = n+2;
    n_i = n;
    ilo_i = ilo;
    ihi_i = ihi;
    lda_i = lda;
    lwork_i = lwork;

    /* Allocate memory for the LAPACK routine arrays */
    a = (double *)LAPACKE_malloc( lda*n * sizeof(double) );
    tau = (double *)LAPACKE_malloc( (n-1) * sizeof(double) );
    work = (double *)LAPACKE_malloc( lwork * sizeof(double) );

    /* Allocate memory for the C interface function arrays */
    a_i = (double *)LAPACKE_malloc( lda*n * sizeof(double) );
    tau_i = (double *)LAPACKE_malloc( (n-1) * sizeof(double) );
    work_i = (double *)LAPACKE_malloc( lwork * sizeof(double) );

    /* Allocate memory for the backup arrays */
    a_save = (double *)LAPACKE_malloc( lda*n * sizeof(double) );
    tau_save = (double *)LAPACKE_malloc( (n-1) * sizeof(double) );

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

    /* Initialize input arrays */
    init_a( lda*n, a );
    init_tau( (n-1), tau );
    init_work( lwork, work );

    /* Backup the ouptut arrays */
    for( i = 0; i < lda*n; i++ ) {
        a_save[i] = a[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        tau_save[i] = tau[i];
    }

    /* Call the LAPACK routine */
    dgehrd_( &n, &ilo, &ihi, a, &lda, tau, work, &lwork, &info );

    /* Initialize input data, call the column-major middle-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < lda*n; i++ ) {
        a_i[i] = a_save[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        tau_i[i] = tau_save[i];
    }
    for( i = 0; i < lwork; i++ ) {
        work_i[i] = work[i];
    }
    info_i = LAPACKE_dgehrd_work( LAPACK_COL_MAJOR, n_i, ilo_i, ihi_i, a_i,
                                  lda_i, tau_i, work_i, lwork_i );

    failed = compare_dgehrd( a, a_i, tau, tau_i, info, info_i, lda, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major middle-level interface to dgehrd\n" );
    } else {
        printf( "FAILED: column-major middle-level interface to dgehrd\n" );
    }

    /* Initialize input data, call the column-major high-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < lda*n; i++ ) {
        a_i[i] = a_save[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        tau_i[i] = tau_save[i];
    }
    for( i = 0; i < lwork; i++ ) {
        work_i[i] = work[i];
    }
    info_i = LAPACKE_dgehrd( LAPACK_COL_MAJOR, n_i, ilo_i, ihi_i, a_i, lda_i,
                             tau_i );

    failed = compare_dgehrd( a, a_i, tau, tau_i, info, info_i, lda, n );
    if( failed == 0 ) {
        printf( "PASSED: column-major high-level interface to dgehrd\n" );
    } else {
        printf( "FAILED: column-major high-level interface to dgehrd\n" );
    }

    /* Initialize input data, call the row-major middle-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < lda*n; i++ ) {
        a_i[i] = a_save[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        tau_i[i] = tau_save[i];
    }
    for( i = 0; i < lwork; i++ ) {
        work_i[i] = work[i];
    }

    LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, a_i, lda, a_r, n+2 );
    info_i = LAPACKE_dgehrd_work( LAPACK_ROW_MAJOR, n_i, ilo_i, ihi_i, a_r,
                                  lda_r, tau_i, work_i, lwork_i );

    LAPACKE_dge_trans( LAPACK_ROW_MAJOR, n, n, a_r, n+2, a_i, lda );

    failed = compare_dgehrd( a, a_i, tau, tau_i, info, info_i, lda, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major middle-level interface to dgehrd\n" );
    } else {
        printf( "FAILED: row-major middle-level interface to dgehrd\n" );
    }

    /* Initialize input data, call the row-major high-level
     * interface to LAPACK routine and check the results */
    for( i = 0; i < lda*n; i++ ) {
        a_i[i] = a_save[i];
    }
    for( i = 0; i < (n-1); i++ ) {
        tau_i[i] = tau_save[i];
    }
    for( i = 0; i < lwork; i++ ) {
        work_i[i] = work[i];
    }

    /* Init row_major arrays */
    LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, a_i, lda, a_r, n+2 );
    info_i = LAPACKE_dgehrd( LAPACK_ROW_MAJOR, n_i, ilo_i, ihi_i, a_r, lda_r,
                             tau_i );

    LAPACKE_dge_trans( LAPACK_ROW_MAJOR, n, n, a_r, n+2, a_i, lda );

    failed = compare_dgehrd( a, a_i, tau, tau_i, info, info_i, lda, n );
    if( failed == 0 ) {
        printf( "PASSED: row-major high-level interface to dgehrd\n" );
    } else {
        printf( "FAILED: row-major high-level interface to dgehrd\n" );
    }

    /* Release memory */
    if( a != NULL ) {
        LAPACKE_free( a );
    }
    if( a_i != NULL ) {
        LAPACKE_free( a_i );
    }
    if( a_r != NULL ) {
        LAPACKE_free( a_r );
    }
    if( a_save != NULL ) {
        LAPACKE_free( a_save );
    }
    if( tau != NULL ) {
        LAPACKE_free( tau );
    }
    if( tau_i != NULL ) {
        LAPACKE_free( tau_i );
    }
    if( tau_save != NULL ) {
        LAPACKE_free( tau_save );
    }
    if( work != NULL ) {
        LAPACKE_free( work );
    }
    if( work_i != NULL ) {
        LAPACKE_free( work_i );
    }

    return 0;
}

/* Auxiliary function: dgehrd scalar parameters initialization */
static void init_scalars_dgehrd( lapack_int *n, lapack_int *ilo,
                                 lapack_int *ihi, lapack_int *lda,
                                 lapack_int *lwork )
{
    *n = 4;
    *ilo = 1;
    *ihi = 4;
    *lda = 8;
    *lwork = 448;

    return;
}

/* Auxiliary functions: dgehrd array parameters initialization */
static void init_a( lapack_int size, double *a ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        a[i] = 0;
    }
    a[0] = 3.49999999999999980e-001;  /* a[0,0] */
    a[8] = 4.50000000000000010e-001;  /* a[0,1] */
    a[16] = -1.40000000000000010e-001;  /* a[0,2] */
    a[24] = -1.70000000000000010e-001;  /* a[0,3] */
    a[1] = 8.99999999999999970e-002;  /* a[1,0] */
    a[9] = 7.00000000000000070e-002;  /* a[1,1] */
    a[17] = -5.40000000000000040e-001;  /* a[1,2] */
    a[25] = 3.49999999999999980e-001;  /* a[1,3] */
    a[2] = -4.40000000000000000e-001;  /* a[2,0] */
    a[10] = -3.30000000000000020e-001;  /* a[2,1] */
    a[18] = -2.99999999999999990e-002;  /* a[2,2] */
    a[26] = 1.70000000000000010e-001;  /* a[2,3] */
    a[3] = 2.50000000000000000e-001;  /* a[3,0] */
    a[11] = -3.20000000000000010e-001;  /* a[3,1] */
    a[19] = -1.30000000000000000e-001;  /* a[3,2] */
    a[27] = 1.10000000000000000e-001;  /* a[3,3] */
}
static void init_tau( lapack_int size, double *tau ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        tau[i] = 0;
    }
}
static void init_work( lapack_int size, double *work ) {
    lapack_int i;
    for( i = 0; i < size; i++ ) {
        work[i] = 0;
    }
}

/* Auxiliary function: C interface to dgehrd results check */
/* Return value: 0 - test is passed, non-zero - test is failed */
static int compare_dgehrd( double *a, double *a_i, double *tau, double *tau_i,
                           lapack_int info, lapack_int info_i, lapack_int lda,
                           lapack_int n )
{
    lapack_int i;
    int failed = 0;
    for( i = 0; i < lda*n; i++ ) {
        failed += compare_doubles(a[i],a_i[i]);
    }
    for( i = 0; i < (n-1); i++ ) {
        failed += compare_doubles(tau[i],tau_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;
}