lapacke_zhegv_2stage.c

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* Contents: Native high-level C interface to LAPACK function zhegv_2stage
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_zhegv_2stage( int matrix_layout, lapack_int itype, char jobz,
                          char uplo, lapack_int n, lapack_complex_double* a,
                          lapack_int lda, lapack_complex_double* b,
                          lapack_int ldb, double* w )
{
    lapack_int info = 0;
    lapack_int lwork = -1;
    double* rwork = NULL;
    lapack_complex_double* work = NULL;
    lapack_complex_double work_query;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_zhegv_2stage", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_zhe_nancheck( matrix_layout, uplo, n, a, lda ) ) {
            return -6;
        }
        if( LAPACKE_zhe_nancheck( matrix_layout, uplo, n, b, ldb ) ) {
            return -8;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    rwork = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,3*n-2) );
    if( rwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    /* Query optimal working array(s) size */
    info = LAPACKE_zhegv_2stage_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
                               ldb, w, &work_query, lwork, rwork );
    if( info != 0 ) {
        goto exit_level_1;
    }
    lwork = LAPACK_Z2INT( work_query );
    /* Allocate memory for work arrays */
    work = (lapack_complex_double*)
        LAPACKE_malloc( sizeof(lapack_complex_double) * lwork );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_zhegv_2stage_work( matrix_layout, itype, jobz, uplo, n, a, lda, b,
                               ldb, w, work, lwork, rwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( rwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_zhegv_2stage", info );
    }
    return info;
}