105 lines
3.3 KiB
C++
105 lines
3.3 KiB
C++
/* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/*
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Bug#68477 Suboptimal code in skip_trailing_space()
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Bug#16395778 SUBOPTIMAL CODE IN SKIP_TRAILING_SPACE()
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Below we test some alternative implementations for skip_trailing_space.
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In order to do benchmarking, configure in optimized mode, and
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generate a separate executable for this file:
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cmake -DMERGE_UNITTESTS=0
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You may want to tweak some constants below:
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- experiment with num_iterations
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- experiment with inserting something in front of the whitespace
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- experiment with different test_values
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run 'strings-t --disable-tap-output' to see timing reports for your platform.
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*/
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// First include (the generated) my_config.h, to get correct platform defines.
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#include "my_config.h"
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#include <gtest/gtest.h>
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#include <string>
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#include "skip_trailing.h"
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namespace skip_trailing_space_unittest {
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#if defined(GTEST_HAS_PARAM_TEST)
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#if !defined(DBUG_OFF)
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// There is no point in benchmarking anything in debug mode.
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const size_t num_iterations= 1ULL;
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#else
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// Set this so that each test case takes a few seconds.
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// And set it back to a small value before pushing!!
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// const size_t num_iterations= 200000000ULL;
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const size_t num_iterations= 2ULL;
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#endif
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class SkipTrailingSpaceTest : public ::testing::TestWithParam<int>
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{
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protected:
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virtual void SetUp()
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{
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int num_spaces= GetParam();
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// Insert something else (or nothing) here,
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// to see effects of alignment of data:
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m_string.append("1");
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for (int ix= 0 ; ix < num_spaces; ++ix)
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m_string.append(" ");
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m_length= m_string.length();
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}
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size_t m_length;
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std::string m_string;
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};
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int test_values[]= {0, 24, 100, 150};
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INSTANTIATE_TEST_CASE_P(Skip, SkipTrailingSpaceTest,
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::testing::ValuesIn(test_values));
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TEST_P(SkipTrailingSpaceTest, Unaligned)
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{
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for (size_t ix= 0; ix < num_iterations; ++ix)
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skip_trailing_unalgn(reinterpret_cast<const uchar*>(m_string.c_str()),
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m_length);
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}
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TEST_P(SkipTrailingSpaceTest, Original)
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{
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for (size_t ix= 0; ix < num_iterations; ++ix)
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skip_trailing_orig(reinterpret_cast<const uchar*>(m_string.c_str()),
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m_length);
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}
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TEST_P(SkipTrailingSpaceTest, FourByte)
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{
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for (size_t ix= 0; ix < num_iterations; ++ix)
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skip_trailing_4byte(reinterpret_cast<const uchar*>(m_string.c_str()),
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m_length);
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}
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TEST_P(SkipTrailingSpaceTest, EightByte)
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{
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for (size_t ix= 0; ix < num_iterations; ++ix)
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skip_trailing_8byte(reinterpret_cast<const uchar*>(m_string.c_str()),
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m_length);
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}
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#endif // GTEST_HAS_PARAM_TEST
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}
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