source: CIVL/examples/omp/dataracebench-1.3.2/micro-benchmarks/original/DRB052-indirectaccesssharebase-orig-no.c

/*
Copyright (c) 2017, Lawrence Livermore National Security, LLC.
Produced at the Lawrence Livermore National Laboratory
Written by Chunhua Liao, Pei-Hung Lin, Joshua Asplund,
Markus Schordan, and Ian Karlin
(email: liao6@llnl.gov, lin32@llnl.gov, asplund1@llnl.gov,
schordan1@llnl.gov, karlin1@llnl.gov)
LLNL-CODE-732144
All rights reserved.

This file is part of DataRaceBench. For details, see
https://github.com/LLNL/dataracebench. Please also see the LICENSE file
for our additional BSD notice.

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or without modification, are permitted provided that the following
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* Redistributions in binary form must reproduce the above copyright
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  in the documentation and/or other materials provided with the
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  may be used to endorse or promote products derived from this
  software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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*/

/*
This example is to mimic a memory access pattern extracted from an LLNL proxy app.
Two pointers have distance of 12.
They are used as base addresses of two arrays, indexed through an index set.
The index set has no two indices with distance of 12.
So there is no loop carried dependence.
*/

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>

#define N 180
int indexSet[N] = {
521, 523, 525, 527, 529, 531,
547, 549, 551, 553, 555, 557,
573, 575, 577, 579, 581, 583,
599, 601, 603, 605, 607, 609,
625, 627, 629, 631, 633, 635,

651, 653, 655, 657, 659, 661,
859, 861, 863, 865, 867, 869,
885, 887, 889, 891, 893, 895,
911, 913, 915, 917, 919, 921, 
937, 939, 941, 943, 945, 947,

963, 965, 967, 969, 971, 973,
989, 991, 993, 995, 997, 999,
1197, 1199, 1201, 1203, 1205, 1207,
1223, 1225, 1227, 1229, 1231, 1233,
1249, 1251, 1253, 1255, 1257, 1259,

1275, 1277, 1279, 1281, 1283, 1285,
1301, 1303, 1305, 1307, 1309, 1311,
1327, 1329, 1331, 1333, 1335, 1337,
1535, 1537, 1539, 1541, 1543, 1545,
1561, 1563, 1565, 1567, 1569, 1571,

1587, 1589, 1591, 1593, 1595, 1597,
1613, 1615, 1617, 1619, 1621, 1623,
1639, 1641, 1643, 1645, 1647, 1649,
1665, 1667, 1669, 1671, 1673, 1675,
1873, 1875, 1877, 1879, 1881, 1883,

1899, 1901, 1903, 1905, 1907, 1909,
1925, 1927, 1929, 1931, 1933, 1935,
1951, 1953, 1955, 1957, 1959, 1961,
1977, 1979, 1981, 1983, 1985, 1987,
2003, 2005, 2007, 2009, 2011, 2013};

int main (int argc, char* argv[])
{
  double * base = (double*) malloc(sizeof(double)* (2013+12+1));
  if (base == 0)
  {
    printf("Error, malloc() returns NULL. End execution. \n");
    return 1;  
  }

  double * xa1 = base;
  double * xa2 = base + 12;
  int i;

  for (i =521; i<= 2025; ++i)
  {
    base[i]=0.0;
  }

#pragma omp parallel for
  for (i =0; i< N; ++i) // this level of loop has no loop carried dependence
  {
    int idx = indexSet[i];
    xa1[idx]+= 1.0;
    xa2[idx]+= 3.0;
  }

  // verify the results, no overlapping of xa1 vs. xa2, no addition happens to the same element twice
  for (i =521; i<= 2025; ++i)
  {
    //printf ("%f  ", base[i]);
    assert (base[i]!=4.0);
  }

  free (base);
  return  0;
}