1// { dg-options "-std=gnu++11" }
2// Use smaller statistics when running on simulators, so it takes less time.
3// For e.g. cris-elf, mipsisa32r2el-elf, powerpc-eabi and i386-linux-gnu,
4// this test fails for SAMPLES=30000.
5// { dg-options "-std=gnu++11 -DSAMPLES=35000" { target simulator } }
6
7// Copyright (C) 2010-2015 Free Software Foundation, Inc.
8//
9// This file is part of the GNU ISO C++ Library.  This library is free
10// software; you can redistribute it and/or modify it under the
11// terms of the GNU General Public License as published by the
12// Free Software Foundation; either version 3, or (at your option)
13// any later version.
14//
15// This library is distributed in the hope that it will be useful,
16// but WITHOUT ANY WARRANTY; without even the implied warranty of
17// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18// GNU General Public License for more details.
19//
20// You should have received a copy of the GNU General Public License
21// along with this library; see the file COPYING3.  If not see
22// <http://www.gnu.org/licenses/>.
23
24#include "chi2_quality.h"
25
26// Tests chi^2 for a set of strings that all consist of '1' and '0'.
27void
28test_bit_string_set()
29{
30  bool test __attribute__((unused)) = true;
31  const unsigned long N = SAMPLES;
32  const unsigned long k = N/100;
33  std::vector<std::string> set;
34  std::string s;
35  for (unsigned long i = 0; i < N; ++i)
36    {
37      s.clear();
38      for (unsigned int j = 0; j < sizeof(unsigned long) * 8; ++j)
39        {
40          const bool bit = (1UL << j) & i;
41          s.push_back(bit ? '1' : '0');
42        }
43      set.push_back(s);
44    }
45
46  double chi2 = chi2_hash(set, k);
47  VERIFY( chi2 < k*1.1 );
48}
49
50int
51main()
52{
53  test_bit_string_set();
54  return 0;
55}
56