lapacke_dtgexc_work.c

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* Contents: Native middle-level C interface to LAPACK function dtgexc
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dtgexc_work( 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, double* work,
                                lapack_int lwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dtgexc( &wantq, &wantz, &n, a, &lda, b, &ldb, q, &ldq, z, &ldz,
                       ifst, ilst, work, &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        lapack_int ldb_t = MAX(1,n);
        lapack_int ldq_t = MAX(1,n);
        lapack_int ldz_t = MAX(1,n);
        double* a_t = NULL;
        double* b_t = NULL;
        double* q_t = NULL;
        double* z_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -6;
            LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
            return info;
        }
        if( ldq < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
            return info;
        }
        if( ldz < n ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_dtgexc( &wantq, &wantz, &n, a, &lda_t, b, &ldb_t, q, &ldq_t,
                           z, &ldz_t, ifst, ilst, work, &lwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        if( wantq ) {
            q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
            if( q_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        if( wantz ) {
            z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,n) );
            if( z_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_3;
            }
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
        LAPACKE_dge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
        if( wantq ) {
            LAPACKE_dge_trans( matrix_layout, n, n, q, ldq, q_t, ldq_t );
        }
        if( wantz ) {
            LAPACKE_dge_trans( matrix_layout, n, n, z, ldz, z_t, ldz_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_dtgexc( &wantq, &wantz, &n, a_t, &lda_t, b_t, &ldb_t, q_t,
                       &ldq_t, z_t, &ldz_t, ifst, ilst, work, &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, b_t, ldb_t, b, ldb );
        if( wantq ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
        }
        if( wantz ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
        }
        /* Release memory and exit */
        if( wantz ) {
            LAPACKE_free( z_t );
        }
exit_level_3:
        if( wantq ) {
            LAPACKE_free( q_t );
        }
exit_level_2:
        LAPACKE_free( b_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dtgexc_work", info );
    }
    return info;
}