ATL_flushcache.c (ulmBLAS/bench/ATL

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/*

 *             Automatically Tuned Linear Algebra Software v3.10.1

 *                    (C) Copyright 2000 R. Clint Whaley

 *

 * 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.

 *   3. The name of the ATLAS group or the names of its contributers may

 *      not be used to endorse or promote products derived from this

 *      software without specific written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * ``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 ATLAS GROUP OR ITS 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.

 *

 */

#include "atlas_misc.h"

double ATL_flushcache(long long size)

/*

 * flush cache by reading enough mem; note that if the compiler gets

 * really smart, may be necessary to make vp a global variable so it

 * can't figure out it's not being modified other than during setup;

 * the fact that ATL_dzero is external will confuse most compilers

 */

{

  static void *vp=NULL;

  static long long N = 0;

  double *cache;

  double dret=0.0;

  size_t i;

  if (size < 0) /* flush cache */

  {

     ATL_assert(vp);

     cache = ATL_AlignPtr(vp);

     if (N > 0) for (i=0; i != N; i++) dret += cache[i];

  }

  else if (size > 0) /* initialize */

  {

     vp = malloc(ATL_Cachelen + size);

     ATL_assert(vp);

     N = size / sizeof(double);

     cache = ATL_AlignPtr(vp);

     ATL_dzero(N, cache, 1);

  }

  else if (size == 0) /* free cache */

  {

     if (vp) free(vp);

     vp = NULL;

     N = 0;

  }

  return(dret);

}