libstdc++-v3/testsuite/23_containers/set/modifiers/16728.cc

   1 // Copyright (C) 2004-2025 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18
  19 /*
  20  * The goal with this application is to compare the performance
  21  * between different std::allocator implementations. The results are
  22  * influenced by the underlying allocator in the "C" library, malloc.
  23  */
  24
  25 #include <set>
  26 #include <sstream>
  27
  28 using namespace std;
  29
  30 typedef int test_type;
  31
  32 // This can take extremely long on simulators, timing out the test.
  33 // { dg-options "-DITERATIONS=10" { target simulator } }
  34 #ifndef ITERATIONS
  35 #define ITERATIONS 10000
  36 #endif
  37
  38 // The number of iterations to be performed.
  39 int iterations = ITERATIONS;
  40
  41 // The number of values to insert in the container, 32 will cause 5
  42 // (re)allocations to be performed (sizes 4, 8, 16, 32 and 64)
  43 // This means that all allocations are within _MAX_BYTES = 128 as
  44 // defined in stl_alloc.h for __pool_alloc.  Whether or not this
  45 // value is relevant in "the real world" or not I don't know and
  46 // should probably be investigated in more detail.
  47 int insert_values = 128;
  48
  49 template<typename TestType>
  50   struct value_type : public pair<TestType, TestType>
  51   {
  52     value_type() : pair<TestType, TestType>(0, 0) { }
  53
  54     inline value_type operator++() { return ++this->first, *this; }
  55     inline operator TestType() const { return this->first; }
  56   };
  57
  58 template<typename Container>
  59   void
  60   do_loop()
  61   {
  62     Container obj;
  63     int test_iterations = 0;
  64     value_type<test_type> test_value;
  65     while (test_iterations < iterations)
  66       {
  67         for (int j = 0; j < insert_values; ++j)
  68           obj.insert(obj.end(), ++test_value);
  69         ++test_iterations;
  70       }
  71   }
  72
  73 template<typename Container>
  74   void
  75   test_container(Container, bool run_threaded = false)
  76   {
  77     do_loop<Container>();
  78     std::ostringstream comment;
  79     if (run_threaded)
  80       comment << "4-way threaded iterations: " << iterations*4 << '\t';
  81     else
  82       comment << "iterations: " << iterations << '\t';
  83   }
  84
  85 // http://gcc.gnu.org/ml/libstdc++/2001-05/msg00105.html
  86 // http://gcc.gnu.org/ml/libstdc++/2003-05/msg00231.html
  87 int main(void)
  88 {
  89   typedef less<test_type> compare_type;
  90   test_container(set<test_type, compare_type>());
  91   return 0;
  92 }