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AK: Add count_required_bits

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This commit is contained in:
Tim Schumacher 2023-05-13 20:04:00 +02:00 • committed by Andreas Kling
parent 8434d76027
commit d194011570
2 changed files with 24 additions and 0 deletions
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13
Tests/AK/TestBuiltinWrappers.cpp
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@ -52,3 +52,16 @@ TEST_CASE(wrapped_count_trailing_zeroes)
EXPECT_EQ(count_trailing_zeroes(static_cast<u64>(1)), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u64>(2)), 1);
}
TEST_CASE(wrapped_count_required_bits)
{
EXPECT_EQ(count_required_bits(0b0u), 1ul);
EXPECT_EQ(count_required_bits(0b1u), 1ul);
EXPECT_EQ(count_required_bits(0b10u), 2ul);
EXPECT_EQ(count_required_bits(0b11u), 2ul);
EXPECT_EQ(count_required_bits(0b100u), 3ul);
EXPECT_EQ(count_required_bits(0b111u), 3ul);
EXPECT_EQ(count_required_bits(0b1000u), 4ul);
EXPECT_EQ(count_required_bits(0b1111u), 4ul);
EXPECT_EQ(count_required_bits(NumericLimits<u32>::max()), sizeof(u32) * 8);
}