123 lines
4.7 KiB
C++
123 lines
4.7 KiB
C++
/*
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Copyright (c) 2015, Arvid Norberg, Alden Torres
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "test.hpp"
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#include "libtorrent/span.hpp"
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#include "libtorrent/hex.hpp" // from_hex
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#include "libtorrent/aux_/ffs.hpp"
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#include "libtorrent/aux_/byteswap.hpp"
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using namespace libtorrent;
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static void to_binary(char const* s, std::uint32_t* buf)
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{
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aux::from_hex({s, 40}, reinterpret_cast<char*>(&buf[0]));
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}
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TORRENT_TEST(count_leading_zeros)
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{
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std::vector<std::pair<char const*, int>> const tests = {
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{ "ffffffffffffffffffffffffffffffffffffffff", 0 },
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{ "0000000000000000000000000000000000000000", 160 },
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{ "fff0000000000000000000000000000000000000", 0 },
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{ "7ff0000000000000000000000000000000000000", 1 },
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{ "3ff0000000000000000000000000000000000000", 2 },
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{ "1ff0000000000000000000000000000000000000", 3 },
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{ "0ff0000000000000000000000000000000000000", 4 },
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{ "07f0000000000000000000000000000000000000", 5 },
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{ "03f0000000000000000000000000000000000000", 6 },
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{ "01f0000000000000000000000000000000000000", 7 },
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{ "00f0000000000000000000000000000000000000", 8 },
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{ "0070000000000000000000000000000000000000", 9 },
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{ "0030000000000000000000000000000000000000", 10 },
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{ "0010000000000000000000000000000000000000", 11 },
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{ "0000000ffff00000000000000000000000000000", 28 },
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{ "00000007fff00000000000000000000000000000", 29 },
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{ "00000003fff00000000000000000000000000000", 30 },
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{ "00000001fff00000000000000000000000000000", 31 },
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{ "00000000fff00000000000000000000000000000", 32 },
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{ "000000007ff00000000000000000000000000000", 33 },
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{ "000000003ff00000000000000000000000000000", 34 },
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{ "000000001ff00000000000000000000000000000", 35 },
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};
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for (auto const& t : tests)
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{
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std::printf("%s\n", t.first);
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std::uint32_t buf[5];
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to_binary(t.first, buf);
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TEST_EQUAL(aux::count_leading_zeros_sw({buf, 5}), t.second);
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TEST_EQUAL(aux::count_leading_zeros_hw({buf, 5}), t.second);
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TEST_EQUAL(aux::count_leading_zeros({buf, 5}), t.second);
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}
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}
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TORRENT_TEST(count_trailing_ones_u32)
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{
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std::uint32_t v = 0;
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TEST_EQUAL(aux::count_trailing_ones_sw(v), 0);
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 0);
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TEST_EQUAL(aux::count_trailing_ones(v), 0);
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v = 0xffffffff;
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TEST_EQUAL(aux::count_trailing_ones_sw(v), 32);
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 32);
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TEST_EQUAL(aux::count_trailing_ones(v), 32);
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v = aux::host_to_network(0xff00ff00);
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TEST_EQUAL(aux::count_trailing_ones_sw(v), 0);
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 0);
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TEST_EQUAL(aux::count_trailing_ones(v), 0);
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v = aux::host_to_network(0xff0fff00);
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TEST_EQUAL(aux::count_trailing_ones_sw(v), 0);
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 0);
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TEST_EQUAL(aux::count_trailing_ones(v), 0);
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v = aux::host_to_network(0xf0ff00ff);
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TEST_EQUAL(aux::count_trailing_ones_sw(v), 8);
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 8);
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TEST_EQUAL(aux::count_trailing_ones(v), 8);
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v = aux::host_to_network(0xf0ff0fff);
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TEST_EQUAL(aux::count_trailing_ones_sw(v), 12);
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 12);
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TEST_EQUAL(aux::count_trailing_ones(v), 12);
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std::uint32_t const arr[2] = {
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aux::host_to_network(0xf0ff0fff)
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, 0xffffffff};
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TEST_EQUAL(aux::count_trailing_ones_sw(arr), 44);
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TEST_EQUAL(aux::count_trailing_ones_hw(arr), 44);
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TEST_EQUAL(aux::count_trailing_ones(arr), 44);
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}
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