lapacke_cheevx_work.c

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* Contents: Native middle-level C interface to LAPACK function cheevx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_cheevx_work( int matrix_layout, char jobz, char range,
                                char uplo, lapack_int n,
                                lapack_complex_float* a, lapack_int lda,
                                float vl, float vu, lapack_int il,
                                lapack_int iu, float abstol, lapack_int* m,
                                float* w, lapack_complex_float* z,
                                lapack_int ldz, lapack_complex_float* work,
                                lapack_int lwork, float* rwork,
                                lapack_int* iwork, lapack_int* ifail )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_cheevx( &jobz, &range, &uplo, &n, a, &lda, &vl, &vu, &il, &iu,
                       &abstol, m, w, z, &ldz, work, &lwork, rwork, iwork,
                       ifail, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ncols_z = ( !LAPACKE_lsame( jobz, 'v' ) ) ? 1 :
                             ( LAPACKE_lsame( range, 'a' ) ||
                               LAPACKE_lsame( range, 'v' ) ) ? n :
                             ( LAPACKE_lsame( range, 'i' ) ? (iu-il+1) : 1);
        lapack_int lda_t = MAX(1,n);
        lapack_int ldz_t = MAX(1,n);
        lapack_complex_float* a_t = NULL;
        lapack_complex_float* z_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_cheevx_work", info );
            return info;
        }
        if( ldz < ncols_z ) {
            info = -16;
            LAPACKE_xerbla( "LAPACKE_cheevx_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( lwork == -1 ) {
            LAPACK_cheevx( &jobz, &range, &uplo, &n, a, &lda_t, &vl, &vu, &il,
                           &iu, &abstol, m, w, z, &ldz_t, work, &lwork, rwork,
                           iwork, ifail, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (lapack_complex_float*)
            LAPACKE_malloc( sizeof(lapack_complex_float) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            z_t = (lapack_complex_float*)
                LAPACKE_malloc( sizeof(lapack_complex_float) *
                                ldz_t * MAX(1,ncols_z) );
            if( z_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_1;
            }
        }
        /* Transpose input matrices */
        LAPACKE_che_trans( matrix_layout, uplo, n, a, lda, a_t, lda_t );
        /* Call LAPACK function and adjust info */
        LAPACK_cheevx( &jobz, &range, &uplo, &n, a_t, &lda_t, &vl, &vu, &il,
                       &iu, &abstol, m, w, z_t, &ldz_t, work, &lwork, rwork,
                       iwork, ifail, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_che_trans( LAPACK_COL_MAJOR, uplo, n, a_t, lda_t, a, lda );
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_cge_trans( LAPACK_COL_MAJOR, n, ncols_z, z_t, ldz_t, z,
                               ldz );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_free( z_t );
        }
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_cheevx_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_cheevx_work", info );
    }
    return info;
}