lapacke_zupgtr_work.c

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* Contents: Native middle-level C interface to LAPACK function zupgtr
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zupgtr_work( int matrix_layout, char uplo, lapack_int n,
                                const lapack_complex_double* ap,
                                const lapack_complex_double* tau,
                                lapack_complex_double* q, lapack_int ldq,
                                lapack_complex_double* work )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_zupgtr( &uplo, &n, ap, tau, q, &ldq, work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldq_t = MAX(1,n);
        lapack_complex_double* q_t = NULL;
        lapack_complex_double* ap_t = NULL;
        /* Check leading dimension(s) */
        if( ldq < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_zupgtr_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        q_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) * ldq_t * MAX(1,n) );
        if( q_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        ap_t = (lapack_complex_double*)
            LAPACKE_malloc( sizeof(lapack_complex_double) *
                            ( MAX(1,n) * MAX(2,n+1) ) / 2 );
        if( ap_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_zpp_trans( matrix_layout, uplo, n, ap, ap_t );
        /* Call LAPACK function and adjust info */
        LAPACK_zupgtr( &uplo, &n, ap_t, tau, q_t, &ldq_t, work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_zge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
        /* Release memory and exit */
        LAPACKE_free( ap_t );
exit_level_1:
        LAPACKE_free( q_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_zupgtr_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_zupgtr_work", info );
    }
    return info;
}