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AK: Add BuiltinWrappers.h

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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.
This commit is contained in:
Nick Johnson 2021-12-12 16:52:57 -06:00 • committed by Andreas Kling
parent 01eefc344a
commit 548529ace4
3 changed files with 165 additions and 0 deletions
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54
Tests/AK/TestBuiltinWrappers.cpp Normal file
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/*
* Copyright (c) 2018-2020, Nick Johnson <sylvyrfysh@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <AK/BuiltinWrappers.h>
#include <AK/Types.h>
TEST_CASE(wrapped_popcount)
{
EXPECT_EQ(popcount(NumericLimits<u8>::max()), 8);
EXPECT_EQ(popcount(NumericLimits<u16>::max()), 16);
EXPECT_EQ(popcount(NumericLimits<u32>::max()), 32);
EXPECT_EQ(popcount(NumericLimits<u64>::max()), 64);
EXPECT_EQ(popcount(NumericLimits<size_t>::max()), static_cast<int>(8 * sizeof(size_t)));
EXPECT_EQ(popcount(0u), 0);
EXPECT_EQ(popcount(0b01010101ULL), 4);
}
TEST_CASE(wrapped_count_leading_zeroes)
{
EXPECT_EQ(count_leading_zeroes(NumericLimits<u8>::max()), 0);
EXPECT_EQ(count_leading_zeroes(static_cast<u8>(0x20)), 2);
EXPECT_EQ(count_leading_zeroes_safe(static_cast<u8>(0)), 8);
EXPECT_EQ(count_leading_zeroes(NumericLimits<u16>::max()), 0);
EXPECT_EQ(count_leading_zeroes(static_cast<u16>(0x20)), 10);
EXPECT_EQ(count_leading_zeroes_safe(static_cast<u16>(0)), 16);
EXPECT_EQ(count_leading_zeroes(NumericLimits<u32>::max()), 0);
EXPECT_EQ(count_leading_zeroes(static_cast<u32>(0x20)), 26);
EXPECT_EQ(count_leading_zeroes_safe(static_cast<u32>(0)), 32);
EXPECT_EQ(count_leading_zeroes(NumericLimits<u64>::max()), 0);
}
TEST_CASE(wrapped_count_trailing_zeroes)
{
EXPECT_EQ(count_trailing_zeroes(NumericLimits<u8>::max()), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u8>(1)), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u8>(2)), 1);
EXPECT_EQ(count_trailing_zeroes_safe(static_cast<u8>(0)), 8);
EXPECT_EQ(count_trailing_zeroes(NumericLimits<u16>::max()), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u16>(1)), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u16>(2)), 1);
EXPECT_EQ(count_trailing_zeroes_safe(static_cast<u16>(0)), 16);
EXPECT_EQ(count_trailing_zeroes(NumericLimits<u32>::max()), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u32>(1)), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u32>(2)), 1);
EXPECT_EQ(count_trailing_zeroes_safe(static_cast<u32>(0)), 32);
EXPECT_EQ(count_trailing_zeroes(NumericLimits<u64>::max()), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u64>(1)), 0);
EXPECT_EQ(count_trailing_zeroes(static_cast<u64>(2)), 1);
}