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/*********************************************************************/
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/* Copyright 2009, 2010 The University of Texas at Austin.           */
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/* All rights reserved.                                              */
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/*                                                                   */
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/* Redistribution and use in source and binary forms, with or        */
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/* without modification, are permitted provided that the following   */
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/* conditions are met:                                               */
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/*                                                                   */
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/*   1. Redistributions of source code must retain the above         */
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/*      copyright notice, this list of conditions and the following  */
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/*      disclaimer.                                                  */
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/*                                                                   */
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/*   2. Redistributions in binary form must reproduce the above      */
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/*      copyright notice, this list of conditions and the following  */
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/*      disclaimer in the documentation and/or other materials       */
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/*      provided with the distribution.                              */
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/*                                                                   */
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/*    THIS  SOFTWARE IS PROVIDED  BY THE  UNIVERSITY OF  TEXAS AT    */
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/*    AUSTIN  ``AS IS''  AND ANY  EXPRESS OR  IMPLIED WARRANTIES,    */
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/*    INCLUDING, BUT  NOT LIMITED  TO, THE IMPLIED  WARRANTIES OF    */
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/*    MERCHANTABILITY  AND FITNESS FOR  A PARTICULAR  PURPOSE ARE    */
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/*    DISCLAIMED.  IN  NO EVENT SHALL THE UNIVERSITY  OF TEXAS AT    */
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/*    AUSTIN OR CONTRIBUTORS BE  LIABLE FOR ANY DIRECT, INDIRECT,    */
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/*    INCIDENTAL,  SPECIAL, EXEMPLARY,  OR  CONSEQUENTIAL DAMAGES    */
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/*    (INCLUDING, BUT  NOT LIMITED TO,  PROCUREMENT OF SUBSTITUTE    */
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/*    GOODS  OR  SERVICES; LOSS  OF  USE,  DATA,  OR PROFITS;  OR    */
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/*    BUSINESS INTERRUPTION) HOWEVER CAUSED  AND ON ANY THEORY OF    */
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/*    LIABILITY, WHETHER  IN CONTRACT, STRICT  LIABILITY, OR TORT    */
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/*    (INCLUDING NEGLIGENCE OR OTHERWISE)  ARISING IN ANY WAY OUT    */
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/*    OF  THE  USE OF  THIS  SOFTWARE,  EVEN  IF ADVISED  OF  THE    */
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/*    POSSIBILITY OF SUCH DAMAGE.                                    */
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/*                                                                   */
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/* The views and conclusions contained in the software and           */
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/* documentation are those of the authors and should not be          */
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/* interpreted as representing official policies, either expressed   */
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/* or implied, of The University of Texas at Austin.                 */
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/*********************************************************************/
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#include <stdio.h></stdio.h>
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#include "common.h"
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#ifdef FUNCTION_PROFILE
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#include "functable.h"
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#endif
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#ifndef CBLAS
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void NAME(blasint *N, FLOAT *ALPHA, FLOAT *x, blasint *INCX, FLOAT *y, blasint *INCY){
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  BLASLONG n    = *N;
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  BLASLONG incx = *INCX;
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  BLASLONG incy = *INCY;
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  FLOAT alpha = *ALPHA;
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#else
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void CNAME(blasint n, FLOAT alpha, FLOAT *x, blasint incx, FLOAT *y, blasint incy){
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#endif
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#ifdef SMP
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  int mode, nthreads;
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#endif
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#ifndef CBLAS
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  PRINT_DEBUG_NAME;
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#else
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  PRINT_DEBUG_CNAME;
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#endif
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  if (n <= 0) return;
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  if (alpha == ZERO) return;
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  IDEBUG_START;
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  FUNCTION_PROFILE_START();
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  if (incx < 0) x -= (n - 1) * incx;
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  if (incy < 0) y -= (n - 1) * incy;
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#ifdef SMP
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  nthreads = num_cpu_avail(1);
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  //disable multi-thread when incx==0 or incy==0
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  //In that case, the threads would be dependent.
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  if (incx == 0 || incy == 0)
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	  nthreads = 1;
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  //Temporarily walk around the low performance issue with small imput size & multithreads.
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  if (n <= 10000)
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	  nthreads = 1;
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  if (nthreads == 1) {
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#endif
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  AXPYU_K(n, 0, 0, alpha, x, incx, y, incy, NULL, 0);
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#ifdef SMP
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  } else {
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#ifdef XDOUBLE
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    mode  =  BLAS_XDOUBLE | BLAS_REAL;
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#elif defined(DOUBLE)
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    mode  =  BLAS_DOUBLE  | BLAS_REAL;
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#else
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    mode  =  BLAS_SINGLE  | BLAS_REAL;
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#endif  
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    blas_level1_thread(mode, n, 0, 0, &alpha, 
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		       x, incx, y, incy, NULL, 0, (void *)AXPYU_K, nthreads);
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  }
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#endif
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  FUNCTION_PROFILE_END(1, 2 * n, 2 * n);
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  IDEBUG_END;
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  return;
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}