lapacke_dsbgst_work.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_dsbgst_work (int matrix_layout, char vect, char uplo, lapack_int n, lapack_int ka, lapack_int kb, double *ab, lapack_int ldab, const double *bb, lapack_int ldbb, double *x, lapack_int ldx, double *work)

Function Documentation

LAPACKE_dsbgst_work()

lapack_int LAPACKE_dsbgst_work	(	int	matrix_layout,
		char	vect,
		char	uplo,
		lapack_int	n,
		lapack_int	ka,
		lapack_int	kb,
		double *	ab,
		lapack_int	ldab,
		const double *	bb,
		lapack_int	ldbb,
		double *	x,
		lapack_int	ldx,
		double *	work )

Definition at line 35 of file lapacke_dsbgst_work.c.

{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_dsbgst( &vect, &uplo, &n, &ka, &kb, ab, &ldab, bb, &ldbb, x,
                       &ldx, work, &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 ldx_t = MAX(1,n);
        double* ab_t = NULL;
        double* bb_t = NULL;
        double* x_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_dsbgst_work", info );
            return info;
        }
        if( ldbb < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_dsbgst_work", info );
            return info;
        }
        if( ldx < n ) {
            info = -12;
            LAPACKE_xerbla( "LAPACKE_dsbgst_work", info );
            return 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( vect, 'v' ) ) {
            x_t = (double*)LAPACKE_malloc( sizeof(double) * ldx_t * MAX(1,n) );
            if( x_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_dsbgst( &vect, &uplo, &n, &ka, &kb, ab_t, &ldab_t, bb_t, &ldbb_t,
                       x_t, &ldx_t, work, &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 );
        if( LAPACKE_lsame( vect, 'v' ) ) {
            LAPACKE_dge_trans( LAPACK_COL_MAJOR, n, n, x_t, ldx_t, x, ldx );
        }
        /* Release memory and exit */
        if( LAPACKE_lsame( vect, 'v' ) ) {
            LAPACKE_free( x_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_dsbgst_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_dsbgst_work", info );
    }
    return info;
}