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Replace BitUtils with C++20: RotateLeft/RotateRight

Browse Source 
Now that we've flipped the C++20 switch, let's start making use of
the nice new <bit> header.

I'm planning on handling this move away from BitUtils.h incrementally
in a series of PRs. There may be a few functions remaining in
BitUtils.h by the end that C++20 doesn't have any equivalents for.
This commit is contained in:
JosJuice 2022-08-05 15:39:00 +02:00
parent 48ce5318e1
commit 454537d53e
11 changed files with 63 additions and 141 deletions
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11
Source/Core/Common/Arm64Emitter.h
View File

@ -3,6 +3,7 @@
#pragma once
#include <bit>
#include <cstring>
#include <functional>
#include <optional>
@ -558,15 +559,15 @@ struct LogicalImm
// pick the next sequence of ones. This ensures we get a complete element
// that has not been cut-in-half due to rotation across the word boundary.
const size_t rotation = Common::CountTrailingZeros(value & (value + 1));
const u64 normalized = Common::RotateRight(value, rotation);
const int rotation = Common::CountTrailingZeros(value & (value + 1));
const u64 normalized = std::rotr(value, rotation);
const size_t element_size = Common::CountTrailingZeros(normalized & (normalized + 1));
const size_t ones = Common::CountTrailingZeros(~normalized);
const int element_size = Common::CountTrailingZeros(normalized & (normalized + 1));
const int ones = Common::CountTrailingZeros(~normalized);
// Check the value is repeating; also ensures element size is a power of two.
if (Common::RotateRight(value, element_size) != value)
if (std::rotr(value, element_size) != value)
{
valid = false;
return;

44
Source/Core/Common/BitUtils.h
View File

@ -107,50 +107,6 @@ constexpr Result ExtractBits(const T src) noexcept
return ExtractBits<T, Result>(src, begin, end);
}
///
/// Rotates a value left (ROL).
///
/// @param value The value to rotate.
/// @param amount The number of bits to rotate the value.
/// @tparam T An unsigned type.
///
/// @return The rotated value.
///
template <typename T>
constexpr T RotateLeft(const T value, size_t amount) noexcept
{
static_assert(std::is_unsigned<T>(), "Can only rotate unsigned types left.");
amount %= BitSize<T>();
if (amount == 0)
return value;
return static_cast<T>((value << amount) | (value >> (BitSize<T>() - amount)));
}
///
/// Rotates a value right (ROR).
///
/// @param value The value to rotate.
/// @param amount The number of bits to rotate the value.
/// @tparam T An unsigned type.
///
/// @return The rotated value.
///
template <typename T>
constexpr T RotateRight(const T value, size_t amount) noexcept
{
static_assert(std::is_unsigned<T>(), "Can only rotate unsigned types right.");
amount %= BitSize<T>();
if (amount == 0)
return value;
return static_cast<T>((value >> amount) | (value << (BitSize<T>() - amount)));
}
///
/// Verifies whether the supplied value is a valid bit mask of the form 0b00...0011...11.
/// Both edge cases of all zeros and all ones are considered valid masks, too.

4
Source/Core/Common/Crypto/AES.cpp
View File

@ -2,12 +2,12 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <array>
#include <bit>
#include <memory>
#include <mbedtls/aes.h>
#include "Common/Assert.h"
#include "Common/BitUtils.h"
#include "Common/CPUDetect.h"
#include "Common/Crypto/AES.h"
@ -294,7 +294,7 @@ public:
{
const uint8x16_t enc = vaeseq_u8(vreinterpretq_u8_u32(vmovq_n_u32(rk[i + 3])), vmovq_n_u8(0));
const u32 temp = vgetq_lane_u32(vreinterpretq_u32_u8(enc), 0);
rk[i + 4] = rk[i + 0] ^ Common::RotateRight(temp, 8) ^ rcon[i / Nk];
rk[i + 4] = rk[i + 0] ^ std::rotr(temp, 8) ^ rcon[i / Nk];
rk[i + 5] = rk[i + 4] ^ rk[i + 1];
rk[i + 6] = rk[i + 5] ^ rk[i + 2];
rk[i + 7] = rk[i + 6] ^ rk[i + 3];

8
Source/Core/Common/Hash.cpp
View File

@ -4,7 +4,9 @@
#include "Common/Hash.h"
#include <algorithm>
#include <bit>
#include <cstring>
#include <zlib.h>
#include "Common/BitUtils.h"
@ -60,15 +62,15 @@ static u64 getblock(const u64* p, int i)
static void bmix64(u64& h1, u64& h2, u64& k1, u64& k2, u64& c1, u64& c2)
{
k1 *= c1;
k1 = Common::RotateLeft(k1, 23);
k1 = std::rotl(k1, 23);
k1 *= c2;
h1 ^= k1;
h1 += h2;
h2 = Common::RotateLeft(h2, 41);
h2 = std::rotl(h2, 41);
k2 *= c2;
k2 = Common::RotateLeft(k2, 23);
k2 = std::rotl(k2, 23);
k2 *= c1;
h2 ^= k2;
h2 += h1;

30
Source/Core/Core/ARDecrypt.cpp
View File

@ -9,6 +9,7 @@
#include <algorithm>
#include <array>
#include <bit>
#include <cstring>
#include <string>
#include <vector>
@ -17,7 +18,6 @@
#include <windows.h>
#endif
#include "Common/BitUtils.h"
#include "Common/CommonTypes.h"
#include "Common/MsgHandler.h"
#include "Common/StringUtil.h"
@ -249,26 +249,26 @@ static void unscramble1(u32* addr, u32* val)
{
u32 tmp;
*val = Common::RotateLeft(*val, 4);
*val = std::rotl(*val, 4);
tmp = ((*addr ^ *val) & 0xF0F0F0F0);
*addr ^= tmp;
*val = Common::RotateRight((*val ^ tmp), 0x14);
*val = std::rotr((*val ^ tmp), 0x14);
tmp = ((*addr ^ *val) & 0xFFFF0000);
*addr ^= tmp;
*val = Common::RotateRight((*val ^ tmp), 0x12);
*val = std::rotr((*val ^ tmp), 0x12);
tmp = ((*addr ^ *val) & 0x33333333);
*addr ^= tmp;
*val = Common::RotateRight((*val ^ tmp), 6);
*val = std::rotr((*val ^ tmp), 6);
tmp = ((*addr ^ *val) & 0x00FF00FF);
*addr ^= tmp;
*val = Common::RotateLeft((*val ^ tmp), 9);
*val = std::rotl((*val ^ tmp), 9);
tmp = ((*addr ^ *val) & 0xAAAAAAAA);
*addr = Common::RotateLeft((*addr ^ tmp), 1);
*addr = std::rotl((*addr ^ tmp), 1);
*val ^= tmp;
}
@ -276,27 +276,27 @@ static void unscramble2(u32* addr, u32* val)
{
u32 tmp;
*val = Common::RotateRight(*val, 1);
*val = std::rotr(*val, 1);
tmp = ((*addr ^ *val) & 0xAAAAAAAA);
*val ^= tmp;
*addr = Common::RotateRight((*addr ^ tmp), 9);
*addr = std::rotr((*addr ^ tmp), 9);
tmp = ((*addr ^ *val) & 0x00FF00FF);
*val ^= tmp;
*addr = Common::RotateLeft((*addr ^ tmp), 6);
*addr = std::rotl((*addr ^ tmp), 6);
tmp = ((*addr ^ *val) & 0x33333333);
*val ^= tmp;
*addr = Common::RotateLeft((*addr ^ tmp), 0x12);
*addr = std::rotl((*addr ^ tmp), 0x12);
tmp = ((*addr ^ *val) & 0xFFFF0000);
*val ^= tmp;
*addr = Common::RotateLeft((*addr ^ tmp), 0x14);
*addr = std::rotl((*addr ^ tmp), 0x14);
tmp = ((*addr ^ *val) & 0xF0F0F0F0);
*val ^= tmp;
*addr = Common::RotateRight((*addr ^ tmp), 4);
*addr = std::rotr((*addr ^ tmp), 4);
}
static void decryptcode(const u32* seeds, u32* code)
@ -309,13 +309,13 @@ static void decryptcode(const u32* seeds, u32* code)
unscramble1(&addr, &val);
while (i < 32)
{
tmp = (Common::RotateRight(val, 4) ^ seeds[i++]);
tmp = (std::rotr(val, 4) ^ seeds[i++]);
tmp2 = (val ^ seeds[i++]);
addr ^= (table6[tmp & 0x3F] ^ table4[(tmp >> 8) & 0x3F] ^ table2[(tmp >> 16) & 0x3F] ^
table0[(tmp >> 24) & 0x3F] ^ table7[tmp2 & 0x3F] ^ table5[(tmp2 >> 8) & 0x3F] ^
table3[(tmp2 >> 16) & 0x3F] ^ table1[(tmp2 >> 24) & 0x3F]);
tmp = (Common::RotateRight(addr, 4) ^ seeds[i++]);
tmp = (std::rotr(addr, 4) ^ seeds[i++]);
tmp2 = (addr ^ seeds[i++]);
val ^= (table6[tmp & 0x3F] ^ table4[(tmp >> 8) & 0x3F] ^ table2[(tmp >> 16) & 0x3F] ^
table0[(tmp >> 24) & 0x3F] ^ table7[tmp2 & 0x3F] ^ table5[(tmp2 >> 8) & 0x3F] ^

30
Source/Core/Core/HW/WiimoteEmu/Encryption.cpp
View File

@ -6,8 +6,8 @@
#include "Core/HW/WiimoteEmu/Encryption.h"
#include <algorithm>
#include <bit>
#include "Common/BitUtils.h"
#include "Common/Logging/Log.h"
namespace
{
@ -520,15 +520,13 @@ EncryptionKey::KeyData KeyGen1stParty::GenerateKeyData(const EncryptionKey::Rand
for (std::size_t i = 0; i != t0.size(); ++i)
t0[i] = keygen_sbox_1st_party[rand[i]];
auto& ror8 = Common::RotateRight<u8>;
return {
u8((ror8(ans[0] ^ t0[5], t0[2]) - t0[9]) ^ t0[4]),
u8((ror8(ans[1] ^ t0[1], t0[0]) - t0[5]) ^ t0[7]),
u8((ror8(ans[2] ^ t0[6], t0[8]) - t0[2]) ^ t0[0]),
u8((ror8(ans[3] ^ t0[4], t0[7]) - t0[3]) ^ t0[2]),
u8((ror8(ans[4] ^ t0[1], t0[6]) - t0[3]) ^ t0[4]),
u8((ror8(ans[5] ^ t0[7], t0[8]) - t0[5]) ^ t0[9]),
u8((std::rotr<u8>(ans[0] ^ t0[5], t0[2]) - t0[9]) ^ t0[4]),
u8((std::rotr<u8>(ans[1] ^ t0[1], t0[0]) - t0[5]) ^ t0[7]),
u8((std::rotr<u8>(ans[2] ^ t0[6], t0[8]) - t0[2]) ^ t0[0]),
u8((std::rotr<u8>(ans[3] ^ t0[4], t0[7]) - t0[3]) ^ t0[2]),
u8((std::rotr<u8>(ans[4] ^ t0[1], t0[6]) - t0[3]) ^ t0[4]),
u8((std::rotr<u8>(ans[5] ^ t0[7], t0[8]) - t0[5]) ^ t0[9]),
};
}
@ -548,15 +546,13 @@ EncryptionKey::KeyData KeyGen3rdParty::GenerateKeyData(const EncryptionKey::Rand
for (std::size_t i = 0; i != t0.size(); ++i)
t0[i] = keygen_sbox_3rd_party[rand[i]];
auto& rol8 = Common::RotateLeft<u8>;
return {
u8(t0[7] ^ (t0[6] + rol8(ans[0] ^ t0[0], t0[1]))),
u8(t0[1] ^ (t0[3] + rol8(ans[1] ^ t0[4], t0[2]))),
u8(t0[5] ^ (t0[4] + rol8(ans[2] ^ t0[2], t0[8]))),
u8(t0[0] ^ (t0[7] + rol8(ans[3] ^ t0[6], t0[9]))),
u8(t0[1] ^ (t0[8] + rol8(ans[4] ^ t0[5], t0[4]))),
u8(t0[5] ^ (t0[8] + rol8(ans[5] ^ t0[9], t0[3]))),
u8(t0[7] ^ (t0[6] + std::rotl<u8>(ans[0] ^ t0[0], t0[1]))),
u8(t0[1] ^ (t0[3] + std::rotl<u8>(ans[1] ^ t0[4], t0[2]))),
u8(t0[5] ^ (t0[4] + std::rotl<u8>(ans[2] ^ t0[2], t0[8]))),
u8(t0[0] ^ (t0[7] + std::rotl<u8>(ans[3] ^ t0[6], t0[9]))),
u8(t0[1] ^ (t0[8] + std::rotl<u8>(ans[4] ^ t0[5], t0[4]))),
u8(t0[5] ^ (t0[8] + std::rotl<u8>(ans[5] ^ t0[9], t0[3]))),
};
}

8
Source/Core/Core/PowerPC/Interpreter/Interpreter_Integer.cpp
View File

@ -3,6 +3,8 @@
#include "Core/PowerPC/Interpreter/Interpreter.h"
#include <bit>
#include "Common/BitUtils.h"
#include "Common/CommonTypes.h"
#include "Common/Logging/Log.h"
@ -151,7 +153,7 @@ void Interpreter::xoris(UGeckoInstruction inst)
void Interpreter::rlwimix(UGeckoInstruction inst)
{
const u32 mask = MakeRotationMask(inst.MB, inst.ME);
rGPR[inst.RA] = (rGPR[inst.RA] & ~mask) | (Common::RotateLeft(rGPR[inst.RS], inst.SH) & mask);
rGPR[inst.RA] = (rGPR[inst.RA] & ~mask) | (std::rotl(rGPR[inst.RS], inst.SH) & mask);
if (inst.Rc)
Helper_UpdateCR0(rGPR[inst.RA]);
@ -160,7 +162,7 @@ void Interpreter::rlwimix(UGeckoInstruction inst)
void Interpreter::rlwinmx(UGeckoInstruction inst)
{
const u32 mask = MakeRotationMask(inst.MB, inst.ME);
rGPR[inst.RA] = Common::RotateLeft(rGPR[inst.RS], inst.SH) & mask;
rGPR[inst.RA] = std::rotl(rGPR[inst.RS], inst.SH) & mask;
if (inst.Rc)
Helper_UpdateCR0(rGPR[inst.RA]);
@ -169,7 +171,7 @@ void Interpreter::rlwinmx(UGeckoInstruction inst)
void Interpreter::rlwnmx(UGeckoInstruction inst)
{
const u32 mask = MakeRotationMask(inst.MB, inst.ME);
rGPR[inst.RA] = Common::RotateLeft(rGPR[inst.RS], rGPR[inst.RB] & 0x1F) & mask;
rGPR[inst.RA] = std::rotl(rGPR[inst.RS], rGPR[inst.RB] & 0x1F) & mask;
if (inst.Rc)
Helper_UpdateCR0(rGPR[inst.RA]);

14
Source/Core/Core/PowerPC/Jit64/Jit_Integer.cpp
View File

@ -4,6 +4,7 @@
#include "Core/PowerPC/Jit64/Jit.h"
#include <array>
#include <bit>
#include <limits>
#include <vector>
@ -2005,7 +2006,7 @@ void Jit64::rlwinmx(UGeckoInstruction inst)
{
u32 result = gpr.Imm32(s);
if (inst.SH != 0)
result = Common::RotateLeft(result, inst.SH);
result = std::rotl(result, inst.SH);
result &= MakeRotationMask(inst.MB, inst.ME);
gpr.SetImmediate32(a, result);
if (inst.Rc)
@ -2017,7 +2018,7 @@ void Jit64::rlwinmx(UGeckoInstruction inst)
const bool right_shift = inst.SH && inst.ME == 31 && inst.MB == 32 - inst.SH;
const bool field_extract = inst.SH && inst.ME == 31 && inst.MB > 32 - inst.SH;
const u32 mask = MakeRotationMask(inst.MB, inst.ME);
const u32 prerotate_mask = Common::RotateRight(mask, inst.SH);
const u32 prerotate_mask = std::rotr(mask, inst.SH);
const bool simple_mask = mask == 0xff || mask == 0xffff;
const bool simple_prerotate_mask = prerotate_mask == 0xff || prerotate_mask == 0xffff;
// In case of a merged branch, track whether or not we've set flags.
@ -2106,14 +2107,13 @@ void Jit64::rlwimix(UGeckoInstruction inst)
if (gpr.IsImm(a, s))
{
gpr.SetImmediate32(a,
(gpr.Imm32(a) & ~mask) | (Common::RotateLeft(gpr.Imm32(s), inst.SH) & mask));
gpr.SetImmediate32(a, (gpr.Imm32(a) & ~mask) | (std::rotl(gpr.Imm32(s), inst.SH) & mask));
if (inst.Rc)
ComputeRC(a);
}
else if (gpr.IsImm(s) && mask == 0xFFFFFFFF)
{
gpr.SetImmediate32(a, Common::RotateLeft(gpr.Imm32(s), inst.SH));
gpr.SetImmediate32(a, std::rotl(gpr.Imm32(s), inst.SH));
if (inst.Rc)
ComputeRC(a);
@ -2141,7 +2141,7 @@ void Jit64::rlwimix(UGeckoInstruction inst)
RCX64Reg Ra = gpr.Bind(a, RCMode::ReadWrite);
RegCache::Realize(Ra);
AndWithMask(Ra, ~mask);
OR(32, Ra, Imm32(Common::RotateLeft(gpr.Imm32(s), inst.SH) & mask));
OR(32, Ra, Imm32(std::rotl(gpr.Imm32(s), inst.SH) & mask));
}
else if (gpr.IsImm(a))
{
@ -2244,7 +2244,7 @@ void Jit64::rlwnmx(UGeckoInstruction inst)
const u32 mask = MakeRotationMask(inst.MB, inst.ME);
if (gpr.IsImm(b, s))
{
gpr.SetImmediate32(a, Common::RotateLeft(gpr.Imm32(s), gpr.Imm32(b) & 0x1F) & mask);
gpr.SetImmediate32(a, std::rotl(gpr.Imm32(s), gpr.Imm32(b) & 0x1F) & mask);
}
else if (gpr.IsImm(b))
{

8
Source/Core/Core/PowerPC/JitArm64/JitArm64_Integer.cpp
View File

@ -3,6 +3,8 @@
#include "Core/PowerPC/JitArm64/Jit.h"
#include <bit>
#include "Common/Arm64Emitter.h"
#include "Common/Assert.h"
#include "Common/BitUtils.h"
@ -700,7 +702,7 @@ void JitArm64::rlwinmx(UGeckoInstruction inst)
const u32 mask = MakeRotationMask(inst.MB, inst.ME);
if (gpr.IsImm(inst.RS))
{
gpr.SetImmediate(a, Common::RotateLeft(gpr.GetImm(s), inst.SH) & mask);
gpr.SetImmediate(a, std::rotl(gpr.GetImm(s), inst.SH) & mask);
if (inst.Rc)
ComputeRC0(gpr.GetImm(a));
return;
@ -749,7 +751,7 @@ void JitArm64::rlwnmx(UGeckoInstruction inst)
if (gpr.IsImm(b) && gpr.IsImm(s))
{
gpr.SetImmediate(a, Common::RotateLeft(gpr.GetImm(s), gpr.GetImm(b) & 0x1F) & mask);
gpr.SetImmediate(a, std::rotl(gpr.GetImm(s), gpr.GetImm(b) & 0x1F) & mask);
if (inst.Rc)
ComputeRC0(gpr.GetImm(a));
}
@ -1924,7 +1926,7 @@ void JitArm64::rlwimix(UGeckoInstruction inst)
if (gpr.IsImm(a) && gpr.IsImm(s))
{
u32 res = (gpr.GetImm(a) & ~mask) | (Common::RotateLeft(gpr.GetImm(s), inst.SH) & mask);
u32 res = (gpr.GetImm(a) & ~mask) | (std::rotl(gpr.GetImm(s), inst.SH) & mask);
gpr.SetImmediate(a, res);
if (inst.Rc)
ComputeRC0(res);

9
Source/Core/Core/PowerPC/MMU.cpp
View File

@ -3,6 +3,7 @@
#include "Core/PowerPC/MMU.h"
#include <bit>
#include <cstddef>
#include <cstring>
#include <string>
@ -267,8 +268,8 @@ static void WriteToHardware(Memory::MemoryManager& memory, u32 em_address, const
// Note that "word" means 32-bit, so paired singles or doubles might still be 32-bit aligned!
const u32 first_half_size = em_address_end_page - em_address;
const u32 second_half_size = size - first_half_size;
WriteToHardware<flag, never_translate>(
memory, em_address, Common::RotateRight(data, second_half_size * 8), first_half_size);
WriteToHardware<flag, never_translate>(memory, em_address,
std::rotr(data, second_half_size * 8), first_half_size);
WriteToHardware<flag, never_translate>(memory, em_address_end_page, data, second_half_size);
return;
}
@ -353,7 +354,7 @@ static void WriteToHardware(Memory::MemoryManager& memory, u32 em_address, const
}
}
const u32 swapped_data = Common::swap32(Common::RotateRight(data, size * 8));
const u32 swapped_data = Common::swap32(std::rotr(data, size * 8));
// Locked L1 technically doesn't have a fixed address, but games all use 0xE0000000.
if (memory.GetL1Cache() && (em_address >> 28 == 0xE) &&
@ -376,7 +377,7 @@ static void WriteToHardware(Memory::MemoryManager& memory, u32 em_address, const
// (https://github.com/dolphin-emu/hwtests/pull/42)
ProcessorInterface::SetInterrupt(ProcessorInterface::INT_CAUSE_PI);
const u32 rotated_data = Common::RotateRight(data, ((em_address & 0x3) + size) * 8);
const u32 rotated_data = std::rotr(data, ((em_address & 0x3) + size) * 8);
for (u32 addr = em_address & ~0x7; addr < em_address + size; addr += 8)
{

38
Source/UnitTests/Common/BitUtilsTest.cpp
View File

@ -57,44 +57,6 @@ TEST(BitUtils, ExtractBits)
EXPECT_EQ((Common::ExtractBits<0, 31, s32, s32>(negative_one)), -1);
}
TEST(BitUtils, RotateLeft)
{
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0, 0), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0, 4), 0x0F0F0F0FU);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0, 8), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0F0F0F0F0, 0), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0F0F0F0F0, 4), 0x0F0F0F0F0F0F0F0FU);
EXPECT_EQ(Common::RotateLeft(0xF0F0F0F0F0F0F0F0, 8), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 1), 0xE3E3E3E3U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 2), 0xC7C7C7C7U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 3), 0x8F8F8F8FU);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1, 4), 0x1F1F1F1FU);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 1), 0xE3E3E3E3E3E3E3E3U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 2), 0xC7C7C7C7C7C7C7C7U);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 3), 0x8F8F8F8F8F8F8F8FU);
EXPECT_EQ(Common::RotateLeft(0xF1F1F1F1F1F1F1F1, 4), 0x1F1F1F1F1F1F1F1FU);
}
TEST(BitUtils, RotateRight)
{
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0, 0), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0, 4), 0x0F0F0F0FU);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0, 8), 0xF0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0F0F0F0F0, 0), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0F0F0F0F0, 4), 0x0F0F0F0F0F0F0F0FU);
EXPECT_EQ(Common::RotateRight(0xF0F0F0F0F0F0F0F0, 8), 0xF0F0F0F0F0F0F0F0U);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 1), 0xF8F8F8F8U);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 2), 0x7C7C7C7CU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 3), 0x3E3E3E3EU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1, 4), 0x1F1F1F1FU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 1), 0xF8F8F8F8F8F8F8F8U);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 2), 0x7C7C7C7C7C7C7C7CU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 3), 0x3E3E3E3E3E3E3E3EU);
EXPECT_EQ(Common::RotateRight(0xF1F1F1F1F1F1F1F1, 4), 0x1F1F1F1F1F1F1F1FU);
}
TEST(BitUtils, IsValidLowMask)
{
EXPECT_TRUE(Common::IsValidLowMask(0b0u));