mirror of
https://github.com/arvidn/libtorrent.git
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arvidn
117 lines
3.8 KiB
C++
117 lines
3.8 KiB
C++
/*
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Copyright (c) 2016, Alden Torres
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Copyright (c) 2016-2017, 2019-2020, 2022, Arvid Norberg
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All rights reserved.
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You may use, distribute and modify this code under the terms of the BSD license,
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see LICENSE file.
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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 lt;
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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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#if TORRENT_HAS_BUILTIN_CLZ || defined _MSC_VER
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TEST_EQUAL(aux::count_leading_zeros_hw({buf, 5}), t.second);
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#endif
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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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#if TORRENT_HAS_BUILTIN_CTZ || defined _MSC_VER
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 0);
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#endif
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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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#if TORRENT_HAS_BUILTIN_CTZ || defined _MSC_VER
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 32);
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#endif
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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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#if TORRENT_HAS_BUILTIN_CTZ || defined _MSC_VER
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 0);
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#endif
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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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#if TORRENT_HAS_BUILTIN_CTZ || defined _MSC_VER
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 0);
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#endif
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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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#if TORRENT_HAS_BUILTIN_CTZ || defined _MSC_VER
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 8);
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#endif
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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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#if TORRENT_HAS_BUILTIN_CTZ || defined _MSC_VER
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TEST_EQUAL(aux::count_trailing_ones_hw(v), 12);
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#endif
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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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#if TORRENT_HAS_BUILTIN_CTZ || defined _MSC_VER
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TEST_EQUAL(aux::count_trailing_ones_hw(arr), 44);
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#endif
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TEST_EQUAL(aux::count_trailing_ones(arr), 44);
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}
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