lapacke_sgbtrs_work.c

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* Contents: Native middle-level C interface to LAPACK function sgbtrs
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sgbtrs_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 lapack_int* ipiv, float* b,
                                lapack_int ldb )
{
    lapack_int info = 0;
    if( matrix_layout == LAPACK_COL_MAJOR ) {
        /* Call LAPACK function and adjust info */
        LAPACK_sgbtrs( &trans, &n, &kl, &ku, &nrhs, ab, &ldab, ipiv, b, &ldb,
                       &info );
        if( info < 0 ) {
            info = info - 1;
        }
    } else if( matrix_layout == LAPACK_ROW_MAJOR ) {
        lapack_int ldab_t = MAX(1,2*kl+ku+1);
        lapack_int ldb_t = MAX(1,n);
        float* ab_t = NULL;
        float* b_t = NULL;
        /* Check leading dimension(s) */
        if( ldab < n ) {
            info = -8;
            LAPACKE_xerbla( "LAPACKE_sgbtrs_work", info );
            return info;
        }
        if( ldb < nrhs ) {
            info = -11;
            LAPACKE_xerbla( "LAPACKE_sgbtrs_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;
        }
        b_t = (float*)LAPACKE_malloc( sizeof(float) * ldb_t * MAX(1,nrhs) );
        if( b_t == NULL ) {
            info = LAPACK_TRANSPOSE_MEMORY_ERROR;
            goto exit_level_1;
        }
        /* Transpose input matrices */
        LAPACKE_sgb_trans( matrix_layout, n, n, kl, kl+ku, ab, ldab, ab_t,
                           ldab_t );
        LAPACKE_sge_trans( matrix_layout, n, nrhs, b, ldb, b_t, ldb_t );
        /* Call LAPACK function and adjust info */
        LAPACK_sgbtrs( &trans, &n, &kl, &ku, &nrhs, ab_t, &ldab_t, ipiv, b_t,
                       &ldb_t, &info );
        if( info < 0 ) {
            info = info - 1;
        }
        /* Transpose output matrices */
        LAPACKE_sge_trans( LAPACK_COL_MAJOR, n, nrhs, b_t, ldb_t, b, ldb );
        /* Release memory and exit */
        LAPACKE_free( b_t );
exit_level_1:
        LAPACKE_free( ab_t );
exit_level_0:
        if( info == LAPACK_TRANSPOSE_MEMORY_ERROR ) {
            LAPACKE_xerbla( "LAPACKE_sgbtrs_work", info );
        }
    } else {
        info = -1;
        LAPACKE_xerbla( "LAPACKE_sgbtrs_work", info );
    }
    return info;
}