lapacke_shseqr.c

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* Contents: Native high-level C interface to LAPACK function shseqr
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_shseqr( int matrix_layout, char job, char compz, lapack_int n,
                           lapack_int ilo, lapack_int ihi, float* h,
                           lapack_int ldh, float* wr, float* wi, float* z,
                           lapack_int ldz )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    float* work = NULL;
    float work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_shseqr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_sge_nancheck( matrix_layout, n, n, h, ldh ) ) {
            return -7;
        }
        if( LAPACKE_lsame( compz, 'i' ) || LAPACKE_lsame( compz, 'v' ) ) {
            if( LAPACKE_sge_nancheck( matrix_layout, n, n, z, ldz ) ) {
                return -11;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_shseqr_work( matrix_layout, job, compz, n, ilo, ihi, h, ldh,
                                wr, wi, z, ldz, &work_query, lwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Call middle-level interface */
    info = LAPACKE_shseqr_work( matrix_layout, job, compz, n, ilo, ihi, h, ldh,
                                wr, wi, z, ldz, work, lwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_shseqr", info );
    }
    return info;
}