lapacke_sgtrfs.c

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* Contents: Native high-level C interface to LAPACK function sgtrfs
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_sgtrfs( int matrix_layout, char trans, lapack_int n,
                           lapack_int nrhs, const float* dl, const float* d,
                           const float* du, const float* dlf, const float* df,
                           const float* duf, const float* du2,
                           const lapack_int* ipiv, const float* b,
                           lapack_int ldb, float* x, lapack_int ldx,
                           float* ferr, float* berr )
{
    lapack_int info = 0;
    lapack_int* iwork = NULL;
    float* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_sgtrfs", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_sge_nancheck( matrix_layout, n, nrhs, b, ldb ) ) {
            return -13;
        }
        if( LAPACKE_s_nancheck( n, d, 1 ) ) {
            return -6;
        }
        if( LAPACKE_s_nancheck( n, df, 1 ) ) {
            return -9;
        }
        if( LAPACKE_s_nancheck( n-1, dl, 1 ) ) {
            return -5;
        }
        if( LAPACKE_s_nancheck( n-1, dlf, 1 ) ) {
            return -8;
        }
        if( LAPACKE_s_nancheck( n-1, du, 1 ) ) {
            return -7;
        }
        if( LAPACKE_s_nancheck( n-2, du2, 1 ) ) {
            return -11;
        }
        if( LAPACKE_s_nancheck( n-1, duf, 1 ) ) {
            return -10;
        }
        if( LAPACKE_sge_nancheck( matrix_layout, n, nrhs, x, ldx ) ) {
            return -15;
        }
    }
#endif
    /* Allocate memory for working array(s) */
    iwork = (lapack_int*)LAPACKE_malloc( sizeof(lapack_int) * MAX(1,n) );
    if( iwork == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_0;
    }
    work = (float*)LAPACKE_malloc( sizeof(float) * MAX(1,3*n) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_sgtrfs_work( matrix_layout, trans, n, nrhs, dl, d, du, dlf,
                                df, duf, du2, ipiv, b, ldb, x, ldx, ferr, berr,
                                work, iwork );
    /* Release memory and exit */
    LAPACKE_free( work );
exit_level_1:
    LAPACKE_free( iwork );
exit_level_0:
    if( info == LAPACK_WORK_MEMORY_ERROR ) {
        LAPACKE_xerbla( "LAPACKE_sgtrfs", info );
    }
    return info;
}