lapacke_dggsvp3.c

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* Contents: Native high-level C interface to LAPACK function dggsvp3
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dggsvp3( int matrix_layout, char jobu, char jobv, char jobq,
                            lapack_int m, lapack_int p, lapack_int n, double* a,
                            lapack_int lda, double* b, lapack_int ldb,
                            double tola, double tolb, lapack_int* k,
                            lapack_int* l, double* u, lapack_int ldu, double* v,
                            lapack_int ldv, double* q, lapack_int ldq )
{
    lapack_int info = 0;
    lapack_int* iwork = NULL;
    double* tau = NULL;
    double* work = NULL;
    lapack_int lwork = -1;
    double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dggsvp3", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dge_nancheck( matrix_layout, m, n, a, lda ) ) {
            return -8;
        }
        if( LAPACKE_dge_nancheck( matrix_layout, p, n, b, ldb ) ) {
            return -10;
        }
        if( LAPACKE_d_nancheck( 1, &tola, 1 ) ) {
            return -12;
        }
        if( LAPACKE_d_nancheck( 1, &tolb, 1 ) ) {
            return -13;
        }
    }
#endif
    /* Query optimal size for working array */
    info = LAPACKE_dggsvp3_work( matrix_layout, jobu, jobv, jobq, m, p, n,
                                 a, lda, b, ldb, tola, tolb, k, l, u, ldu,
                                 v, ldv, q, ldq, iwork, tau, &work_query,
                                 lwork );
    if( info != 0 )
      goto exit_level_0;
    lwork = work_query;
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,n) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    tau = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,n) );
    if( tau == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_2;
    }
    /* Call middle-level interface */
    info = LAPACKE_dggsvp3_work( matrix_layout, jobu, jobv, jobq, m, p, n, a, lda,
                                 b, ldb, tola, tolb, k, l, u, ldu, v, ldv, q,
                                 ldq, iwork, tau, work, lwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_2:
    LAPACKE_free( tau );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dggsvp3", info );
    }
    return info;
}