lapacke_sgbrfs_work.c File Reference

#include "lapacke_utils.h"

Go to the source code of this file.

Functions
lapack_int	LAPACKE_sgbrfs_work (int matrix_layout, char trans, lapack_int n, lapack_int kl, lapack_int ku, lapack_int nrhs, const float *ab, lapack_int ldab, const float *afb, lapack_int ldafb, const lapack_int *ipiv, const float *b, lapack_int ldb, float *x, lapack_int ldx, float *ferr, float *berr, float *work, lapack_int *iwork)

Function Documentation

LAPACKE_sgbrfs_work()

lapack_int LAPACKE_sgbrfs_work	(	int	matrix_layout,
		char	trans,
		lapack_int	n,
		lapack_int	kl,
		lapack_int	ku,
		lapack_int	nrhs,
		const float *	ab,
		lapack_int	ldab,
		const float *	afb,
		lapack_int	ldafb,
		const lapack_int *	ipiv,
		const float *	b,
		lapack_int	ldb,
		float *	x,
		lapack_int	ldx,
		float *	ferr,
		float *	berr,
		float *	work,
		lapack_int *	iwork )

Definition at line 35 of file lapacke_sgbrfs_work.c.

{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sgbrfs( &trans, &n, &kl, &ku, &nrhs, ab, &ldab, afb, &ldafb,
                       ipiv, b, &ldb, x, &ldx, ferr, berr, work, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,kl+ku+1);
        lapack_int ldafb_t = MAX(1,2*kl+ku+1);
        lapack_int ldb_t = MAX(1,n);
        lapack_int ldx_t = MAX(1,n);
        float* ab_t = NULL;
        float* afb_t = NULL;
        float* b_t = NULL;
        float* x_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
            return info;
        }
        if( ldafb < n ) {
            info = -10;
            LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
            return info;
        }
        if( ldb < nrhs ) {
            info = -13;
            LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
            return info;
        }
        if( ldx < nrhs ) {
            info = -15;
            LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
            return info;
        }
        /* Allocate memory for temporary array(s) */
        ab_t = (float*)LAPACKE_malloc( sizeof(float) * ldab_t * MAX(1,n) );
        if( ab_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_0;
        }
        afb_t = (float*)LAPACKE_malloc( sizeof(float) * ldafb_t * MAX(1,n) );
        if( afb_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        b_t = (float*)LAPACKE_malloc( sizeof(float) * ldb_t * MAX(1,nrhs) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_2;
        }
        x_t = (float*)LAPACKE_malloc( sizeof(float) * ldx_t * MAX(1,nrhs) );
        if( x_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_3;
        }
        /* Transpose input matrices */
        LAPACKE_sgb_trans( matrix_layout, n, n, kl, ku, ab, ldab, ab_t, ldab_t );
        LAPACKE_sgb_trans( matrix_layout, n, n, kl, kl+ku, afb, ldafb, afb_t,
                           ldafb_t );
        LAPACKE_sge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
        LAPACKE_sge_trans( matrix_layout, n, nrhs, x, ldx, x_t, ldx_t );
        /* Call LAPACK function and adjust info */
        LAPACK_sgbrfs( &trans, &n, &kl, &ku, &nrhs, ab_t, &ldab_t, afb_t,
                       &ldafb_t, ipiv, b_t, &ldb_t, x_t, &ldx_t, ferr, berr,
                       work, iwork, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, nrhs, x_t, ldx_t, x, ldx );
        /* Release memory and exit */
        LAPACKE_free( x_t );
exit_level_3:
        LAPACKE_free( b_t );
exit_level_2:
        LAPACKE_free( afb_t );
exit_level_1:
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sgbrfs_work", info );
    }
    return info;
}