lapacke_dsbgvd_work.c

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* Contents: Native middle-level C interface to LAPACK function dsbgvd
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dsbgvd_work( int matrix_layout, char jobz, char uplo,
                                lapack_int n, lapack_int ka, lapack_int kb,
                                double* ab, lapack_int ldab, double* bb,
                                lapack_int ldbb, double* w, double* z,
                                lapack_int ldz, double* work, lapack_int lwork,
                                lapack_int* iwork, lapack_int liwork )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dsbgvd( &jobz, &uplo, &n, &ka, &kb, ab, &ldab, bb, &ldbb, w, z,
                       &ldz, work, &lwork, iwork, &liwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,ka+1);
        lapack_int ldbb_t = MAX(1,kb+1);
        lapack_int ldz_t = MAX(1,n);
        double* ab_t = NULL;
        double* bb_t = NULL;
        double* z_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
            return info;
        }
        if( ldbb < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
            return info;
        }
        if( ldz < n ) {
            info = -13;
            LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( liwork == -1 || lwork == -1 ) {
            LAPACK_dsbgvd( &jobz, &uplo, &n, &ka, &kb, ab, &ldab_t, bb, &ldbb_t,
                           w, z, &ldz_t, work, &lwork, iwork, &liwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        ab_t = (double*)LAPACKE_malloc( sizeof(double) * ldab_t * MAX(1,n) );
        if( ab_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        bb_t = (double*)LAPACKE_malloc( sizeof(double) * ldbb_t * MAX(1,n) );
        if( bb_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        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_2;
            }
        }
        /* Transpose input matrices */
        LAPACKE_dsb_trans( matrix_layout, uplo, n, ka, ab, ldab, ab_t, ldab_t );
        LAPACKE_dsb_trans( matrix_layout, uplo, n, kb, bb, ldbb, bb_t, ldbb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dsbgvd( &jobz, &uplo, &n, &ka, &kb, ab_t, &ldab_t, bb_t, &ldbb_t,
                       w, z_t, &ldz_t, work, &lwork, iwork, &liwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dsb_trans( LAPACK_COL_MAJOR, uplo, n, ka, ab_t, ldab_t, ab,
                           ldab );
        LAPACKE_dsb_trans( LAPACK_COL_MAJOR, uplo, n, kb, bb_t, ldbb_t, bb,
                           ldbb );
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, z_t, ldz_t, z, ldz );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( jobz, 'v' ) ) {
            LAPACKE_free( z_t );
        }
exit_level_2:
        LAPACKE_free( bb_t );
exit_level_1:
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dsbgvd_work", info );
    }
    return info;
}