lapacke_dsygvd_work.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_dsygvd_work (int matrix_layout, lapack_int itype, char jobz, char uplo, lapack_int n, double *a, lapack_int lda, double *b, lapack_int ldb, double *w, double *work, lapack_int lwork, lapack_int *iwork, lapack_int liwork)

Function Documentation

LAPACKE_dsygvd_work()

lapack_int LAPACKE_dsygvd_work	(	int	matrix_layout,
		lapack_int	itype,
		char	jobz,
		char	uplo,
		lapack_int	n,
		double *	a,
		lapack_int	lda,
		double *	b,
		lapack_int	ldb,
		double *	w,
		double *	work,
		lapack_int	lwork,
		lapack_int *	iwork,
		lapack_int	liwork )

Definition at line 35 of file lapacke_dsygvd_work.c.

{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dsygvd( &itype, &jobz, &uplo, &n, a, &lda, b, &ldb, w, work,
                       &lwork, iwork, &liwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int lda_t = MAX(1,n);
        lapack_int ldb_t = MAX(1,n);
        double* a_t = NULL;
        double* b_t = NULL;
        /* Check leading dimension(s) */
        if( lda < n ) {
            info = -7;
            LAPACKE_xerbla( "LAPACKE_dsygvd_work", info );
            return info;
        }
        if( ldb < n ) {
            info = -9;
            LAPACKE_xerbla( "LAPACKE_dsygvd_work", info );
            return info;
        }
        /* Query optimal working array(s) size if requested */
        if( liwork == -1 || lwork == -1 ) {
            LAPACK_dsygvd( &itype, &jobz, &uplo, &n, a, &lda_t, b, &ldb_t, w,
                           work, &lwork, iwork, &liwork, &info );
            return (info < 0) ? (info - 1) : info;
        }
        /* Allocate memory for temporary array(s) */
        a_t = (double*)LAPACKE_malloc( sizeof(double) * lda_t * MAX(1,n) );
        if( a_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        b_t = (double*)LAPACKE_malloc( sizeof(double) * ldb_t * MAX(1,n) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_dge_trans( matrix_layout, n, n, a, lda, a_t, lda_t );
        LAPACKE_dge_trans( matrix_layout, n, n, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_dsygvd( &itype, &jobz, &uplo, &n, a_t, &lda_t, b_t, &ldb_t, w,
                       work, &lwork, iwork, &liwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, a_t, lda_t, a, lda );
        LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, b_t, ldb_t, b, ldb );
        /* Release memory and exit */
        LAPACKE_free( b_t );
exit_level_1:
        LAPACKE_free( a_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_dsygvd_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dsygvd_work", info );
    }
    return info;
}