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https://github.com/SerenityOS/serenity
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548529ace4
The goal of this file is to enable C++ overloaded functions for standard builtin functions that we use. It contains fallback implementations for systems that do not have the builtins available.
55 lines
2.3 KiB
C++
55 lines
2.3 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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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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