lapacke_sgeev_work.c

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* Contents: Native middle-level C interface to LAPACK function sgeev
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sgeev_work( int matrix_layout, char jobvl, char jobvr,
                               lapack_int n, float* a, lapack_int lda,
                               float* wr, float* wi, float* vl, lapack_int ldvl,
                               float* vr, lapack_int ldvr, float* work,
                               lapack_int lwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sgeev( &jobvl, &jobvr, &n, a, &lda, wr, wi, vl, &ldvl, vr, &ldvr,
                      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 ldvl_t = MAX(1,n);
        lapack_int ldvr_t = MAX(1,n);
        float* a_t = NULL;
        float* vl_t = NULL;
        float* vr_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -6;
            LAPACKE_xerbla( "LAPACKE_sgeev_work", info );
            return info;
        }
        if( ldvl < 1 || ( LAPACKE_lsame( jobvl, 'v' ) && ldvl < n ) ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_sgeev_work", info );
            return info;
        }
        if( ldvr < 1 || ( LAPACKE_lsame( jobvr, 'v' ) && ldvr < n ) ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_sgeev_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_sgeev( &jobvl, &jobvr, &n, a, &lda_t, wr, wi, vl, &ldvl_t,
                          vr, &ldvr_t, work, &lwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (float*)LAPACKE_malloc( sizeof(float) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( jobvl, 'v' ) ) {
            vl_t = (float*)LAPACKE_malloc( sizeof(float) * ldvl_t * MAX(1,n) );
            if( vl_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        if( LAPACKE_lsame( jobvr, 'v' ) ) {
            vr_t = (float*)LAPACKE_malloc( sizeof(float) * ldvr_t * MAX(1,n) );
            if( vr_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        /* Transpose input matrices */
        LAPACKE_sge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
        /* Call LAPACK function and adjust info */
        LAPACK_sgeev( &jobvl, &jobvr, &n, a_t, &lda_t, wr, wi, vl_t, &ldvl_t,
                      vr_t, &ldvr_t, work, &lwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
        if( LAPACKE_lsame( jobvl, 'v' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, vl_t, ldvl_t, vl, ldvl );
        }
        if( LAPACKE_lsame( jobvr, 'v' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, n, vr_t, ldvr_t, vr, ldvr );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobvr, 'v' ) ) {
            LAPACKE_free( vr_t );
        }
exit_level_2:
        if( LAPACKE_lsame( jobvl, 'v' ) ) {
            LAPACKE_free( vl_t );
        }
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_sgeev_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sgeev_work", info );
    }
    return info;
}