/*! \file
Copyright (c) 2003, The Regents of the University of California, through
Lawrence Berkeley National Laboratory (subject to receipt of any required
approvals from U.S. Dept. of Energy)

All rights reserved.

The source code is distributed under BSD license, see the file License.txt
at the top-level directory.
*/
#include "slu_scomplex.h"
#include "slu_mt_Cnames.h"

double scsum1_(int* n, complex* cx, int* incx) {
    /*  -- LAPACK auxiliary routine (version 2.0) --
           Univ. of Tennessee, Univ. of California Berkeley, NAG Ltd.,
           Courant Institute, Argonne National Lab, and Rice University
           October 31, 1992


        Purpose
        =======

        SCSUM1 takes the sum of the absolute values of a complex
        vector and returns a single precision result.

        Based on SCASUM from the Level 1 BLAS.
        The change is to use the 'genuine' absolute value.

        Contributed by Nick Higham for use with CLACON.

        Arguments
        =========

        N       (input) INT
                The number of elements in the vector CX.

        CX      (input) COMPLEX array, dimension (N)
                The vector whose elements will be summed.

        INCX    (input) INT
                The spacing between successive values of CX.  INCX > 0.

        =====================================================================




       Parameter adjustments
           Function Body */
    /* System generated locals */
    int i__1, i__2;
    float ret_val;
    /* Builtin functions */
    double c_abs(complex*);
    /* Local variables */
    static int i, nincx;
    static float stemp;

#define CX(I) cx[(I) - 1]

    ret_val = 0.f;
    stemp = 0.f;
    if(*n <= 0) {
        return ret_val;
    }
    if(*incx == 1) {
        goto L20;
    }

    /*     CODE FOR INCREMENT NOT EQUAL TO 1 */

    nincx = *n * *incx;
    i__1 = nincx;
    i__2 = *incx;
    for(i = 1; *incx < 0 ? i >= nincx : i <= nincx; i += *incx) {
        /*        NEXT LINE MODIFIED. */

        stemp += c_abs(&CX(i));
        /* L10: */
    }
    ret_val = stemp;
    return ret_val;

    /*     CODE FOR INCREMENT EQUAL TO 1 */

L20:
    i__2 = *n;
    for(i = 1; i <= *n; ++i) {
        /*        NEXT LINE MODIFIED. */

        stemp += c_abs(&CX(i));
        /* L30: */
    }
    ret_val = stemp;
    return ret_val;

    /*     End of SCSUM1 */

} /* scsum1_ */
