/* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */

/*
  Bug#68477    Suboptimal code in skip_trailing_space()
  Bug#16395778 SUBOPTIMAL CODE IN SKIP_TRAILING_SPACE()

  Below we test some alternative implementations for skip_trailing_space.
  In order to do benchmarking, configure in optimized mode, and
  generate a separate executable for this file:
    cmake -DMERGE_UNITTESTS=0
  You may want to tweak some constants below:
   - experiment with num_iterations
   - experiment with inserting something in front of the whitespace
   - experiment with different test_values
  run 'strings-t --disable-tap-output' to see timing reports for your platform.
 */

// First include (the generated) my_config.h, to get correct platform defines.
#include "my_config.h"
#include <gtest/gtest.h>
#include <string>

#include "skip_trailing.h"

namespace skip_trailing_space_unittest {

#if defined(GTEST_HAS_PARAM_TEST)

#if !defined(DBUG_OFF)
// There is no point in benchmarking anything in debug mode.
const size_t num_iterations= 1ULL;
#else
// Set this so that each test case takes a few seconds.
// And set it back to a small value before pushing!!
// const size_t num_iterations= 200000000ULL;
const size_t num_iterations= 2ULL;
#endif

class SkipTrailingSpaceTest : public ::testing::TestWithParam<int>
{
protected:
  virtual void SetUp()
  {
    int num_spaces= GetParam();
    // Insert something else (or nothing) here,
    //   to see effects of alignment of data:
    m_string.append("1");
    for (int ix= 0 ; ix < num_spaces; ++ix)
      m_string.append(" ");
    m_length= m_string.length();
  }
  size_t m_length;
  std::string m_string;
};

int test_values[]= {0, 24, 100, 150};

INSTANTIATE_TEST_CASE_P(Skip, SkipTrailingSpaceTest,
                        ::testing::ValuesIn(test_values));

TEST_P(SkipTrailingSpaceTest, Unaligned)
{
  for (size_t ix= 0; ix < num_iterations; ++ix)
    skip_trailing_unalgn(reinterpret_cast<const uchar*>(m_string.c_str()),
                         m_length);
}

TEST_P(SkipTrailingSpaceTest, Original)
{
  for (size_t ix= 0; ix < num_iterations; ++ix)
    skip_trailing_orig(reinterpret_cast<const uchar*>(m_string.c_str()),
                       m_length);
}

TEST_P(SkipTrailingSpaceTest, FourByte)
{
  for (size_t ix= 0; ix < num_iterations; ++ix)
    skip_trailing_4byte(reinterpret_cast<const uchar*>(m_string.c_str()),
                        m_length);
}

TEST_P(SkipTrailingSpaceTest, EightByte)
{
  for (size_t ix= 0; ix < num_iterations; ++ix)
    skip_trailing_8byte(reinterpret_cast<const uchar*>(m_string.c_str()),
                        m_length);
}

#endif  // GTEST_HAS_PARAM_TEST

}