lapacke_dspgv_work.c

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* Contents: Native middle-level C interface to LAPACK function dspgv
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dspgv_work( int matrix_layout, lapack_int itype, char jobz,
                               char uplo, lapack_int n, double* ap, double* bp,
                               double* w, double* z, lapack_int ldz,
                               double* work )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dspgv( &itype, &jobz, &uplo, &n, ap, bp, w, z, &ldz, work,
                      &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldz_t = MAX(1,n);
        double* z_t = NULL;
        double* ap_t = NULL;
        double* bp_t = NULL;
        /* Check leading dimension(s) */
        if( ldz < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_dspgv_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            z_t = (double*)LAPACKE_malloc( sizeof(double) * ldz_t * MAX(1,n) );
            if( z_t == NULL ) {
                info = LAPACK_TRANSPOSE_MEMORY_ERROR;
                goto exit_level_0;
            }
        }
        ap_t = (double*)
            LAPACKE_malloc( sizeof(double) * ( MAX(1,n) * MAX(2,n+1) ) / 2 );
        if( ap_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        bp_t = (double*)
            LAPACKE_malloc( sizeof(double) * ( MAX(1,n) * MAX(2,n+1) ) / 2 );
        if( bp_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        /* Transpose input matrices */
        LAPACKE_dsp_trans( matrix_layout, uplo, n, ap, ap_t );
        LAPACKE_dsp_trans( matrix_layout, uplo, n, bp, bp_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dspgv( &itype, &jobz, &uplo, &n, ap_t, bp_t, w, z_t, &ldz_t,
                      work, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
        }
        LAPACKE_dsp_trans( LAPACK_COL_MAJOR, uplo, n, ap_t, ap );
        LAPACKE_dsp_trans( LAPACK_COL_MAJOR, uplo, n, bp_t, bp );
        /* Release memory and exit */
        LAPACKE_free( bp_t );
exit_level_2:
        LAPACKE_free( ap_t );
exit_level_1:
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_free( z_t );
        }
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dspgv_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dspgv_work", info );
    }
    return info;
}