/*********************************************************************/

/* Copyright 2009, 2010 The University of Texas at Austin.           */

/* All rights reserved.                                              */

/*                                                                   */

/* Redistribution and use in source and binary forms, with or        */

/* without modification, are permitted provided that the following   */

/* conditions are met:                                               */

/*                                                                   */

/*   1. Redistributions of source code must retain the above         */

/*      copyright notice, this list of conditions and the following  */

/*      disclaimer.                                                  */

/*                                                                   */

/*   2. Redistributions in binary form must reproduce the above      */

/*      copyright notice, this list of conditions and the following  */

/*      disclaimer in the documentation and/or other materials       */

/*      provided with the distribution.                              */

/*                                                                   */

/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */

/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */

/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */

/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */

/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */

/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */

/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */

/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */

/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */

/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */

/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */

/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */

/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */

/*    POSSIBILITY OF SUCH DAMAGE.                                    */

/*                                                                   */

/* The views and conclusions contained in the software and           */

/* documentation are those of the authors and should not be          */

/* interpreted as representing official policies, either expressed   */

/* or implied, of The University of Texas at Austin.                 */

/*********************************************************************/

#include <stdio.h></stdio.h>

#include "common.h"

#ifdef FUNCTION_PROFILE

#include "functable.h"

#endif

#ifndef CBLAS

void NAME(blasint *N, FLOAT *x, blasint *INCX, FLOAT *y, blasint *INCY){

  blasint n    = *N;

  blasint incx = *INCX;

  blasint incy = *INCY;

#else

void CNAME(blasint n, FLOAT *x, blasint incx, FLOAT *y, blasint incy){

#endif

#ifdef SMP

  int mode, nthreads;

  FLOAT dummyalpha[2] = {ZERO, ZERO};

#endif

#ifndef CBLAS

  PRINT_DEBUG_NAME;

#else

  PRINT_DEBUG_CNAME;

#endif

  if (n <= 0) return;

  IDEBUG_START;

  FUNCTION_PROFILE_START();

  if (incx < 0) x -= (n - 1) * incx;

  if (incy < 0) y -= (n - 1) * incy;

#ifdef SMP

  nthreads = num_cpu_avail(1);

  //disable multi-thread when incx==0 or incy==0

  //In that case, the threads would be dependent.

  if (incx == 0 || incy == 0)

	  nthreads = 1;

  if (nthreads == 1) {

#endif

    SWAP_K(n, 0, 0, ZERO, x, incx, y, incy, NULL, 0);

#ifdef SMP

  } else {

#ifdef XDOUBLE

    mode  =  BLAS_XDOUBLE | BLAS_REAL;

#elif defined(DOUBLE)

    mode  =  BLAS_DOUBLE  | BLAS_REAL;

#else

    mode  =  BLAS_SINGLE  | BLAS_REAL;

#endif  

    blas_level1_thread(mode, n, 0, 0, dummyalpha,

		       x, incx, y, incy, NULL, 0, (void *)SWAP_K, nthreads);

  }

#endif

  FUNCTION_PROFILE_END(1, 2 * n, 0);

  IDEBUG_END;

  return;

}