lapacke_dtgexc.c

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* Contents: Native high-level C interface to LAPACK function dtgexc
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dtgexc( int matrix_layout, lapack_logical wantq,
                           lapack_logical wantz, lapack_int n, double* a,
                           lapack_int lda, double* b, lapack_int ldb, double* q,
                           lapack_int ldq, double* z, lapack_int ldz,
                           lapack_int* ifst, lapack_int* ilst )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    double* work = NULL;
    double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dtgexc", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dge_nancheck( matrix_layout, n, n, a, lda ) ) {
            return -5;
        }
        if( LAPACKE_dge_nancheck( matrix_layout, n, n, b, ldb ) ) {
            return -7;
        }
        if( wantq ) {
            if( LAPACKE_dge_nancheck( matrix_layout, n, n, q, ldq ) ) {
                return -9;
            }
        }
        if( wantz ) {
            if( LAPACKE_dge_nancheck( matrix_layout, n, n, z, ldz ) ) {
                return -11;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_dtgexc_work( matrix_layout, wantq, wantz, n, a, lda, b, ldb,
                                q, ldq, z, ldz, ifst, ilst, &work_query,
                                lwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    work = (double*)LAPACKE_malloc( sizeof(double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_dtgexc_work( matrix_layout, wantq, wantz, n, a, lda, b, ldb,
                                q, ldq, z, ldz, ifst, ilst, work, lwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_dtgexc", info );
    }
    return info;
}