lapacke_cheevd_2stage_work.c

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* Contents: Native middle-level C interface to LAPACK function cheevd_2stage
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_cheevd_2stage_work( int matrix_layout, char jobz, char uplo,
                                lapack_int n, lapack_complex_float* a,
                                lapack_int lda, float* w,
                                lapack_complex_float* work, lapack_int lwork,
                                float* rwork, lapack_int lrwork,
                                lapack_int* iwork, lapack_int liwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_cheevd_2stage( &jobz, &uplo, &n, a, &lda, w, work, &lwork, rwork,
                       &lrwork, iwork, &liwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        lapack_complex_float* a_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -6;
            LAPACKE_xerbla( "LAPACKE_cheevd_2stage_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( liwork == -1 || lrwork == -1 || lwork == -1 ) {
            LAPACK_cheevd_2stage( &jobz, &uplo, &n, a, &lda_t, w, work, &lwork, rwork,
                           &lrwork, iwork, &liwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (lapack_complex_float*)
            LAPACKE_malloc( sizeof(lapack_complex_float) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        /* Transpose input matrices */
        LAPACKE_che_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
        /* Call LAPACK function and adjust info */
        LAPACK_cheevd_2stage( &jobz, &uplo, &n, a_t, &lda_t, w, work, &lwork, rwork,
                       &lrwork, iwork, &liwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if ( jobz == 'V' || jobz == 'v' ) {
            LAPACKE_cge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
        } else {
            LAPACKE_che_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda ); 
        }
        /* Release memory and exit */
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_cheevd_2stage_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_cheevd_2stage_work", info );
    }
    return info;
}