lapacke_dgtsvx.c

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* Contents: Native high-level C interface to LAPACK function dgtsvx
* Author: Intel Corporation
*****************************************************************************/
 
#include "lapacke_utils.h"
 
lapack_int LAPACKE_dgtsvx( int matrix_layout, char fact, char trans,
                           lapack_int n, lapack_int nrhs, const double* dl,
                           const double* d, const double* du, double* dlf,
                           double* df, double* duf, double* du2,
                           lapack_int* ipiv, const double* b, lapack_int ldb,
                           double* x, lapack_int ldx, double* rcond,
                           double* ferr, double* berr )
{
    lapack_int info = 0;
    lapack_int* iwork = NULL;
    double* work = NULL;
    if( matrix_layout != LAPACK_COL_MAJOR && matrix_layout != LAPACK_ROW_MAJOR ) {
        LAPACKE_xerbla( "LAPACKE_dgtsvx", -1 );
        return -1;
    }
#ifndef LAPACK_DISABLE_NAN_CHECK
    if( LAPACKE_get_nancheck() ) {
        /* Optionally check input matrices for NaNs */
        if( LAPACKE_dge_nancheck( matrix_layout, n, nrhs, b, ldb ) ) {
            return -14;
        }
        if( LAPACKE_d_nancheck( n, d, 1 ) ) {
            return -7;
        }
        if( LAPACKE_lsame( fact, 'f' ) ) {
            if( LAPACKE_d_nancheck( n, df, 1 ) ) {
                return -10;
            }
        }
        if( LAPACKE_d_nancheck( n-1, dl, 1 ) ) {
            return -6;
        }
        if( LAPACKE_lsame( fact, 'f' ) ) {
            if( LAPACKE_d_nancheck( n-1, dlf, 1 ) ) {
                return -9;
            }
        }
        if( LAPACKE_d_nancheck( n-1, du, 1 ) ) {
            return -8;
        }
        if( LAPACKE_lsame( fact, 'f' ) ) {
            if( LAPACKE_d_nancheck( n-2, du2, 1 ) ) {
                return -12;
            }
        }
        if( LAPACKE_lsame( fact, 'f' ) ) {
            if( LAPACKE_d_nancheck( n-1, duf, 1 ) ) {
                return -11;
            }
        }
    }
#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 = (double*)LAPACKE_malloc( sizeof(double) * MAX(1,3*n) );
    if( work == NULL ) {
        info = LAPACK_WORK_MEMORY_ERROR;
        goto exit_level_1;
    }
    /* Call middle-level interface */
    info = LAPACKE_dgtsvx_work( matrix_layout, fact, trans, n, nrhs, dl, d, du,
                                dlf, df, duf, du2, ipiv, b, ldb, x, ldx, rcond,
                                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_dgtsvx", info );
    }
    return info;
}