lapacke_shsein_work.c

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* Contents: Native middle-level C interface to LAPACK function shsein
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_shsein_work( int matrix_layout, char job, char eigsrc,
                                char initv, lapack_logical* select,
                                lapack_int n, const float* h, lapack_int ldh,
                                float* wr, const float* wi, float* vl,
                                lapack_int ldvl, float* vr, lapack_int ldvr,
                                lapack_int mm, lapack_int* m, float* work,
                                lapack_int* ifaill, lapack_int* ifailr )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_shsein( &job, &eigsrc, &initv, select, &n, h, &ldh, wr, wi, vl,
                       &ldvl, vr, &ldvr, &mm, m, work, ifaill, ifailr, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldh_t = MAX(1,n);
        lapack_int ldvl_t = MAX(1,n);
        lapack_int ldvr_t = MAX(1,n);
        float* h_t = NULL;
        float* vl_t = NULL;
        float* vr_t = NULL;
        /* Check leading dimension(s) */
        if( ldh < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_shsein_work", info );
            return info;
        }
        if( ldvl < mm ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_shsein_work", info );
            return info;
        }
        if( ldvr < mm ) {
            info = -14;
            LAPACKE_xerbla( "LAPACKE_shsein_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        h_t = (float*)LAPACKE_malloc( sizeof(float) * ldh_t * MAX(1,n) );
        if( h_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'l' ) ) {
            vl_t = (float*)LAPACKE_malloc( sizeof(float) * ldvl_t * MAX(1,mm) );
            if( vl_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'r' ) ) {
            vr_t = (float*)LAPACKE_malloc( sizeof(float) * ldvr_t * MAX(1,mm) );
            if( vr_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_2;
            }
        }
        /* Transpose input matrices */
        LAPACKE_sge_trans( matrix_layout, n, n, h, ldh, h_t, ldh_t );
        if( ( LAPACKE_lsame( job, 'l' ) || LAPACKE_lsame( job, 'b' ) ) &&
            LAPACKE_lsame( initv, 'v' ) ) {
            LAPACKE_sge_trans( matrix_layout, n, mm, vl, ldvl, vl_t, ldvl_t );
        }
        if( ( LAPACKE_lsame( job, 'r' ) || LAPACKE_lsame( job, 'b' ) ) &&
            LAPACKE_lsame( initv, 'v' ) ) {
            LAPACKE_sge_trans( matrix_layout, n, mm, vr, ldvr, vr_t, ldvr_t );
        }
        /* Call LAPACK function and adjust info */
        LAPACK_shsein( &job, &eigsrc, &initv, select, &n, h_t, &ldh_t, wr, wi,
                       vl_t, &ldvl_t, vr_t, &ldvr_t, &mm, m, work, ifaill,
                       ifailr, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'l' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, mm, vl_t, ldvl_t, vl,
                               ldvl );
        }
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'r' ) ) {
            LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, mm, vr_t, ldvr_t, vr,
                               ldvr );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'r' ) ) {
            LAPACKE_free( vr_t );
        }
exit_level_2:
        if( LAPACKE_lsame( job, 'b' ) || LAPACKE_lsame( job, 'l' ) ) {
            LAPACKE_free( vl_t );
        }
exit_level_1:
        LAPACKE_free( h_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_shsein_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_shsein_work", info );
    }
    return info;
}