lapacke_dsbtrd_work.c

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* Contents: Native middle-level C interface to LAPACK function dsbtrd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dsbtrd_work( int matrix_layout, char vect, char uplo,
                                lapack_int n, lapack_int kd, double* ab,
                                lapack_int ldab, double* d, double* e,
                                double* q, lapack_int ldq, double* work )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dsbtrd( &vect, &uplo, &n, &kd, ab, &ldab, d, e, q, &ldq, work,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,kd+1);
        lapack_int ldq_t = MAX(1,n);
        double* ab_t = NULL;
        double* q_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
            return info;
        }
        if( ldq < n ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
        if( ab_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
            q_t = (double*)LAPACKE_malloc( sizeof(double) * ldq_t * MAX(1,n) );
            if( q_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        /* Transpose input matrices */
        LAPACKE_dsb_trans( matrix_layout, uplo, n, kd, ab, ldab, ab_t, ldab_t );
        if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
            LAPACKE_dge_trans( matrix_layout, n, n, q, ldq, q_t, ldq_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_dsbtrd( &vect, &uplo, &n, &kd, ab_t, &ldab_t, d, e, q_t, &ldq_t,
                       work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dsb_trans( LAPACK_COL_MAJOR, uplo, n, kd, ab_t, ldab_t, ab,
                           ldab );
        if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, q_t, ldq_t, q, ldq );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( vect, 'u' ) || LAPACKE_lsame( vect, 'v' ) ) {
            LAPACKE_free( q_t );
        }
exit_level_1:
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dsbtrd_work", info );
    }
    return info;
}