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d52ffcd830
Rename unsigned_int generator to number_u32. Add generators: - number_u64 - number_f64 - percentage
105 lines
4.0 KiB
C++
105 lines
4.0 KiB
C++
/*
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* Copyright (c) 2018-2020, Nick Johnson <sylvyrfysh@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibTest/TestCase.h>
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#include <AK/BuiltinWrappers.h>
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#include <AK/Types.h>
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using namespace Test::Randomized;
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TEST_CASE(wrapped_popcount)
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{
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EXPECT_EQ(popcount(NumericLimits<u8>::max()), 8);
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EXPECT_EQ(popcount(NumericLimits<u16>::max()), 16);
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EXPECT_EQ(popcount(NumericLimits<u32>::max()), 32);
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EXPECT_EQ(popcount(NumericLimits<u64>::max()), 64);
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EXPECT_EQ(popcount(NumericLimits<size_t>::max()), static_cast<int>(8 * sizeof(size_t)));
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EXPECT_EQ(popcount(0u), 0);
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EXPECT_EQ(popcount(0b01010101ULL), 4);
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}
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TEST_CASE(wrapped_count_leading_zeroes)
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{
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EXPECT_EQ(count_leading_zeroes(NumericLimits<u8>::max()), 0);
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EXPECT_EQ(count_leading_zeroes(static_cast<u8>(0x20)), 2);
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EXPECT_EQ(count_leading_zeroes_safe(static_cast<u8>(0)), 8);
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EXPECT_EQ(count_leading_zeroes(NumericLimits<u16>::max()), 0);
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EXPECT_EQ(count_leading_zeroes(static_cast<u16>(0x20)), 10);
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EXPECT_EQ(count_leading_zeroes_safe(static_cast<u16>(0)), 16);
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EXPECT_EQ(count_leading_zeroes(NumericLimits<u32>::max()), 0);
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EXPECT_EQ(count_leading_zeroes(static_cast<u32>(0x20)), 26);
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EXPECT_EQ(count_leading_zeroes_safe(static_cast<u32>(0)), 32);
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EXPECT_EQ(count_leading_zeroes(NumericLimits<u64>::max()), 0);
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}
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TEST_CASE(wrapped_count_trailing_zeroes)
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{
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EXPECT_EQ(count_trailing_zeroes(NumericLimits<u8>::max()), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u8>(1)), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u8>(2)), 1);
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EXPECT_EQ(count_trailing_zeroes_safe(static_cast<u8>(0)), 8);
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EXPECT_EQ(count_trailing_zeroes(NumericLimits<u16>::max()), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u16>(1)), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u16>(2)), 1);
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EXPECT_EQ(count_trailing_zeroes_safe(static_cast<u16>(0)), 16);
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EXPECT_EQ(count_trailing_zeroes(NumericLimits<u32>::max()), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u32>(1)), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u32>(2)), 1);
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EXPECT_EQ(count_trailing_zeroes_safe(static_cast<u32>(0)), 32);
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EXPECT_EQ(count_trailing_zeroes(NumericLimits<u64>::max()), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u64>(1)), 0);
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EXPECT_EQ(count_trailing_zeroes(static_cast<u64>(2)), 1);
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}
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TEST_CASE(wrapped_count_required_bits)
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{
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EXPECT_EQ(count_required_bits(0b0u), 1ul);
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EXPECT_EQ(count_required_bits(0b1u), 1ul);
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EXPECT_EQ(count_required_bits(0b10u), 2ul);
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EXPECT_EQ(count_required_bits(0b11u), 2ul);
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EXPECT_EQ(count_required_bits(0b100u), 3ul);
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EXPECT_EQ(count_required_bits(0b111u), 3ul);
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EXPECT_EQ(count_required_bits(0b1000u), 4ul);
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EXPECT_EQ(count_required_bits(0b1111u), 4ul);
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EXPECT_EQ(count_required_bits(NumericLimits<u32>::max()), sizeof(u32) * 8);
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}
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RANDOMIZED_TEST_CASE(count_leading_zeroes)
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{
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// count_leading_zeroes(0b000...0001000...000)
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// == count_leading_zeroes(0b000...0001___...___) (where _ is 0 or 1)
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GEN(e, Gen::number_u64(0, 63));
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auto power_of_two = 1ULL << e;
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// We add random one-bits below the leftmost (and only) one-bit.
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// This shouldn't change the output of count_leading_zeroes because
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// the function should only care about the most significant one.
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GEN(below, Gen::number_u64(0, power_of_two - 1));
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auto n = power_of_two + below;
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EXPECT_EQ(count_leading_zeroes(n), count_leading_zeroes(power_of_two));
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}
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RANDOMIZED_TEST_CASE(count_required_bits)
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{
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// count_required_bits(n) == log2(n) + 1
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// log2(0) is -infinity, we don't care about that
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GEN(n, Gen::number_u32(1, NumericLimits<u32>::max()));
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size_t expected = AK::log2(static_cast<double>(n)) + 1;
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EXPECT_EQ(count_required_bits(n), expected);
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}
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RANDOMIZED_TEST_CASE(bit_scan_forward_count_trailing_zeroes)
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{
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// Behaviour for 0 differs, so we skip it.
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GEN(n, Gen::number_u32(1, 1 << 31));
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EXPECT_EQ(bit_scan_forward(n), count_trailing_zeroes(n) + 1);
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}
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