lapacke_ssyevr.c

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* Contents: Native high-level C interface to LAPACK function ssyevr
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_ssyevr( int matrix_layout, char jobz, char range, char uplo,
                           lapack_int n, float* a, lapack_int lda, float vl,
                           float vu, lapack_int il, lapack_int iu, float abstol,
                           lapack_int* m, float* w, float* z, lapack_int ldz,
                           lapack_int* isuppz )
{
    lapack_int info = 0;
    lapack_int liwork = -1;
    lapack_int lwork = -1;
    lapack_int* iwork = NULL;
    float* work = NULL;
    lapack_int iwork_query;
    float work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_ssyevr", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_ssy_nancheck( matrix_layout, uplo, n, a, lda ) ) {
            return -6;
        }
        if( LAPACKE_s_nancheck( 1, &abstol, 1 ) ) {
            return -12;
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_s_nancheck( 1, &vl, 1 ) ) {
                return -8;
            }
        }
        if( LAPACKE_lsame( range, 'v' ) ) {
            if( LAPACKE_s_nancheck( 1, &vu, 1 ) ) {
                return -9;
            }
        }
    }
#endif
    /* Query optimal working array(s) size */
    info = LAPACKE_ssyevr_work( matrix_layout, jobz, range, uplo, n, a, lda, vl,
                                vu, il, iu, abstol, m, w, z, ldz, isuppz,
                                &work_query, lwork, &iwork_query, liwork );
    if( info != 0 ) {
        goto exit_level_0;
    }
    liwork = iwork_query;
    lwork = (lapack_int)work_query;
    /* Allocate memory for work arrays */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * liwork );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work = (float*)LAPACKE_malloc( sizeof(float) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_ssyevr_work( matrix_layout, jobz, range, uplo, n, a, lda, vl,
                                vu, il, iu, abstol, m, w, z, ldz, isuppz, work,
                                lwork, iwork, liwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_ssyevr", info );
    }
    return info;
}