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AK+Tests: Replace years_to_days_since_epoch by near-instant function
This solves half the problem of #12729. Note that the inverse function time_to_tm() in LibC/time.cpp still uses a slow for-loop. See also #13138
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2 changed files with 103 additions and 8 deletions
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@ -317,8 +317,7 @@ TEST_CASE(years_to_days_since_epoch_points)
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BENCHMARK_CASE(years_to_days_since_epoch_benchmark)
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{
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// This benchmark takes consistently about 295±1 ms on Linux, and roughly 2300 ms on Serenity.
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// TODO: Computing the amount of days should never take dozens of milliseconds.
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// This benchmark takes consistently "0ms" on Linux, and "0ms" on Serenity.
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for (size_t i = 0; i < 100; ++i) {
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int actual_days = years_to_days_since_epoch(-5877640);
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(void)actual_days;
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@ -326,6 +325,70 @@ BENCHMARK_CASE(years_to_days_since_epoch_benchmark)
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}
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}
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TEST_CASE(div_floor_by)
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{
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EXPECT_EQ(AK::Detail::floor_div_by<4>(-5), -2);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(-4), -1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(-3), -1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(-2), -1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(-1), -1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+0), +0);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+1), +0);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+2), +0);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+3), +0);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+4), +1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+5), +1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+6), +1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+7), +1);
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EXPECT_EQ(AK::Detail::floor_div_by<4>(+8), +2);
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}
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TEST_CASE(mod_zeros_in_range)
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{
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(0, 0), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(0, 1), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(0, 2), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(0, 3), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(0, 4), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(0, 5), 2);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(0, 6), 2);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(1, 1), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(1, 2), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(1, 3), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(1, 4), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(1, 5), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(1, 6), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(2, 2), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(2, 3), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(2, 4), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(2, 5), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(2, 6), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(3, 3), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(3, 4), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(3, 5), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(3, 6), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(4, 4), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(4, 5), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(4, 6), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(5, 5), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(5, 6), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(6, 6), 0);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(-5, 3), 2);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(-4, 3), 2);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(-3, 3), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(-2, 3), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(-1, 3), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(-0, 3), 1);
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EXPECT_EQ(AK::Detail::mod_zeros_in_range<4>(+1, 3), 0);
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}
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TEST_CASE(years_to_days_since_epoch_span)
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{
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auto test_data_start_year = 1900;
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