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util: update some bit utility logic

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This commit is contained in:
Michael Scire 2022-04-03 10:51:46 -07:00
parent d7f89a0c31
commit 442656899f
3 changed files with 102 additions and 130 deletions
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24
libraries/libstratosphere/source/socket/impl/socket_api.os.horizon.cpp
View file

@ -113,35 +113,19 @@ namespace ams::socket::impl {
}
u32 InetHtonl(u32 host) {
if constexpr (util::IsBigEndian()) {
return host;
} else {
return util::SwapBytes(host);
}
return util::ConvertToBigEndian(host);
}
u16 InetHtons(u16 host) {
if constexpr (util::IsBigEndian()) {
return host;
} else {
return util::SwapBytes(host);
}
return util::ConvertToBigEndian(host);
}
u32 InetNtohl(u32 net) {
if constexpr (util::IsBigEndian()) {
return net;
} else {
return util::SwapBytes(net);
}
return util::ConvertFromBigEndian(net);
}
u16 InetNtohs(u16 net) {
if constexpr (util::IsBigEndian()) {
return net;
} else {
return util::SwapBytes(net);
}
return util::ConvertFromBigEndian(net);
}
namespace {

131
libraries/libvapours/include/vapours/util/util_bitutil.hpp
View file

@ -30,108 +30,91 @@ namespace ams::util {
}
template <typename T> requires std::integral<T>
class BitsOf {
private:
static constexpr ALWAYS_INLINE int GetLsbPos(T v) {
return __builtin_ctzll(static_cast<u64>(v));
}
template<std::integral T>
constexpr inline T ReverseBits(T x, int sw_bits = 1, int swar_words = 1) {
/* Check pre-conditions. */
AMS_ASSERT(0 <= swar_words && swar_words < (BITSIZEOF(T) + 1));
AMS_ASSERT(BITSIZEOF(T) % swar_words == 0);
AMS_ASSERT(0 <= sw_bits && sw_bits < ((BITSIZEOF(T) / swar_words) + 1));
AMS_ASSERT((BITSIZEOF(T) / swar_words) % sw_bits == 0);
T m_value;
public:
/* Note: GCC has a bug in constant-folding here. Workaround: wrap entire caller with constexpr. */
constexpr ALWAYS_INLINE BitsOf(T value = T(0u)) : m_value(value) {
/* ... */
}
using U = typename std::make_unsigned<T>::type;
const int word_size = BITSIZEOF(T) / swar_words;
const int k = word_size - sw_bits;
constexpr ALWAYS_INLINE bool operator==(const BitsOf &other) const {
return m_value == other.m_value;
}
U u = std::bit_cast<U, T>(x);
for (int i = 1; i < BITSIZEOF(T); i <<= 1) {
const U mask = static_cast<U>(static_cast<U>(-1) / ((static_cast<U>(1) << i) + 1));
constexpr ALWAYS_INLINE bool operator!=(const BitsOf &other) const {
return m_value != other.m_value;
if (k & i) {
u = static_cast<U>(((u & mask) << i) | ((u & static_cast<U>(~mask)) >> i));
}
}
constexpr ALWAYS_INLINE int operator*() const {
return GetLsbPos(m_value);
}
return std::bit_cast<T, U>(u);
}
constexpr ALWAYS_INLINE BitsOf &operator++() {
m_value &= ~(T(1u) << GetLsbPos(m_value));
return *this;
}
constexpr ALWAYS_INLINE BitsOf &operator++(int) {
BitsOf ret(m_value);
++(*this);
return ret;
}
constexpr ALWAYS_INLINE BitsOf begin() const {
return *this;
}
constexpr ALWAYS_INLINE BitsOf end() const {
return BitsOf(T(0u));
}
};
template<std::integral T>
constexpr ALWAYS_INLINE T ReverseBytes(T x, int sw_bytes = 1, int swar_words = 1) {
return ReverseBits(x, sw_bytes * BITSIZEOF(u8), swar_words);
}
template<typename T = u64, typename ...Args> requires std::integral<T>
constexpr ALWAYS_INLINE T CombineBits(Args... args) {
return (... | (T(1u) << args));
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T ResetLeastSignificantOneBit(T x) {
return x & (x - 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T SetLeastSignificantZeroBit(T x) {
return x | (x + 1);
}
template<typename T> requires std::integral<T>
constexpr ALWAYS_INLINE T LeastSignificantOneBit(T x) {
return x & ~(x - 1);
}
template<typename T> requires std::integral<T>
constexpr ALWAYS_INLINE T LeastSignificantZeroBit(T x) {
return ~x & (x + 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T ResetTrailingOnes(T x) {
return x & (x + 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T SetTrailingZeros(T x) {
return x | (x - 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T LeastSignificantOneBit(T x) {
return x & ~(x - 1);
}
template<std::integral T>
constexpr ALWAYS_INLINE T LeastSignificantZeroBit(T x) {
return ~x & (x + 1);
}
template<std::integral T>
constexpr ALWAYS_INLINE T MaskTrailingZeros(T x) {
return (~x) & (x - 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T MaskTrailingOnes(T x) {
return ~((~x) | (x + 1));
return x & ~(x + 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T MaskTrailingZerosAndLeastSignificantOneBit(T x) {
return x ^ (x - 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T MaskTrailingOnesAndLeastSignificantZeroBit(T x) {
return x ^ (x + 1);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE int PopCount(T x) {
using U = typename std::make_unsigned<T>::type;
U u = static_cast<U>(x);
@ -164,7 +147,7 @@ namespace ams::util {
}
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE int CountLeadingZeros(T x) {
if (std::is_constant_evaluated()) {
for (size_t i = 0; i < impl::Log2<BITSIZEOF(T)>; ++i) {
@ -174,9 +157,8 @@ namespace ams::util {
return PopCount(static_cast<T>(~x));
} else {
using U = typename std::make_unsigned<T>::type;
const U u = static_cast<U>(x);
if (u != 0) {
if (const U u = static_cast<U>(x); u != 0) {
if constexpr (std::is_same<U, unsigned long long>::value) {
return __builtin_clzll(u);
} else if constexpr (std::is_same<U, unsigned long>::value) {
@ -198,7 +180,7 @@ namespace ams::util {
static_assert(CountLeadingZeros(static_cast<u64>(1) << 5) == BITSIZEOF(u64) - 1 - 5);
static_assert(CountLeadingZeros(static_cast<u64>(0)) == BITSIZEOF(u64));
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE int CountTrailingZeros(T x) {
if (std::is_constant_evaluated()) {
auto count = 0;
@ -209,8 +191,7 @@ namespace ams::util {
return count;
} else {
using U = typename std::make_unsigned<T>::type;
const U u = static_cast<U>(x);
if (u != 0) {
if (const U u = static_cast<U>(x); u != 0) {
if constexpr (std::is_same<U, unsigned long long>::value) {
return __builtin_ctzll(u);
} else if constexpr (std::is_same<U, unsigned long>::value) {
@ -231,31 +212,39 @@ namespace ams::util {
static_assert(CountTrailingZeros(static_cast<u64>(1) << 5) == 5);
static_assert(CountTrailingZeros(static_cast<u64>(0)) == BITSIZEOF(u64));
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE bool IsPowerOfTwo(T x) {
return x > 0 && ResetLeastSignificantOneBit(x) == 0;
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T CeilingPowerOfTwo(T x) {
AMS_ASSERT(x > 0);
return T(1) << (BITSIZEOF(T) - CountLeadingZeros(T(x - 1)));
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T FloorPowerOfTwo(T x) {
AMS_ASSERT(x > 0);
return T(1) << (BITSIZEOF(T) - CountLeadingZeros(x) - 1);
}
template<typename T, typename U>
template<std::integral T, std::integral U>
constexpr ALWAYS_INLINE T DivideUp(T v, U d) {
using Unsigned = typename std::make_unsigned<U>::type;
using Sum = decltype(T{0} + U{0});
#if defined(ATMOSPHERE_IS_STRATOSPHERE)
AMS_ASSERT(v >= 0);
AMS_ASSERT(d > 0);
AMS_ASSERT(static_cast<Sum>(v) <= (std::numeric_limits<Sum>::max() - static_cast<Sum>(d) + static_cast<Sum>(1)));
#endif
const Unsigned add = static_cast<Unsigned>(d) - 1;
return static_cast<T>((v + add) / d);
return static_cast<T>((static_cast<Sum>(v) + static_cast<Sum>(add)) / static_cast<Sum>(d));
}
template<typename T, T N, T D>
template<std::integral T, T N, T D>
constexpr ALWAYS_INLINE T ScaleByConstantFactorUp(const T V) {
/* Multiplying and dividing by large numerator/denominator can cause error to be introduced. */
/* This algorithm multiples/divides in stages, so as to mitigate this (particularly with large denominator). */

77
libraries/libvapours/include/vapours/util/util_endian.hpp
View file

@ -30,38 +30,27 @@ namespace ams::util {
static_assert(IsLittleEndian() ^ IsBigEndian());
template<typename U> requires std::unsigned_integral<U>
constexpr ALWAYS_INLINE U SwapBytes(const U u) {
template<std::unsigned_integral U>
constexpr ALWAYS_INLINE U SwapEndian(const U u) {
static_assert(BITSIZEOF(u8) == 8);
constexpr U ByteMask = 0xFFu;
if constexpr (std::is_same<U, u64>::value) {
return ((u & (ByteMask << 56)) >> 56) |
((u & (ByteMask << 48)) >> 40) |
((u & (ByteMask << 40)) >> 24) |
((u & (ByteMask << 32)) >> 8) |
((u & (ByteMask << 24)) << 8) |
((u & (ByteMask << 16)) << 24) |
((u & (ByteMask << 8)) << 40) |
((u & (ByteMask << 0)) << 56);
} else if constexpr (std::is_same<U, u32>::value) {
return ((u & (ByteMask << 24)) >> 24) |
((u & (ByteMask << 16)) >> 8) |
((u & (ByteMask << 8)) << 8) |
((u & (ByteMask << 0)) << 24);
} else if constexpr (std::is_same<U, u16>::value) {
return ((u & (ByteMask << 8)) >> 8) |
((u & (ByteMask << 0)) << 8);
} else if constexpr (std::is_same<U, u8>::value) {
AMS_UNUSED(ByteMask);
if constexpr (sizeof(U) * BITSIZEOF(u8) == 64) {
static_assert(__builtin_bswap64(UINT64_C(0x0123456789ABCDEF)) == UINT64_C(0xEFCDAB8967452301));
return __builtin_bswap64(u);
} else if constexpr (sizeof(U) * BITSIZEOF(u8) == 32) {
static_assert(__builtin_bswap32(0x01234567u) == 0x67452301u);
return __builtin_bswap32(u);
} else if constexpr (sizeof(U) * BITSIZEOF(u8) == 16) {
static_assert(__builtin_bswap16(0x0123u) == 0x2301u);
return __builtin_bswap16(u);
} else if constexpr (sizeof(U) * BITSIZEOF(u8) == 8) {
return u;
} else {
static_assert(!std::is_same<U, U>::value);
}
}
constexpr ALWAYS_INLINE u64 SwapBytes48(const u64 u) {
constexpr ALWAYS_INLINE u64 SwapEndian48(const u64 u) {
using U = u64;
static_assert(BITSIZEOF(u8) == 8);
constexpr U ByteMask = 0xFFu;
@ -74,14 +63,14 @@ namespace ams::util {
((u & (ByteMask << 0)) << 40);
}
template<typename T> requires std::integral<T>
constexpr ALWAYS_INLINE void SwapBytes(T *ptr) {
template<std::integral T>
constexpr ALWAYS_INLINE void SwapEndian(T *ptr) {
using U = typename std::make_unsigned<T>::type;
*ptr = static_cast<T>(SwapBytes<U>(static_cast<U>(*ptr)));
*ptr = static_cast<T>(SwapEndian<U>(static_cast<U>(*ptr)));
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T ConvertToBigEndian(const T val) {
using U = typename std::make_unsigned<T>::type;
@ -89,23 +78,33 @@ namespace ams::util {
return static_cast<T>(static_cast<U>(val));
} else {
static_assert(IsLittleEndian());
return static_cast<T>(SwapBytes<U>(static_cast<U>(val)));
return static_cast<T>(SwapEndian<U>(static_cast<U>(val)));
}
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T ConvertToLittleEndian(const T val) {
using U = typename std::make_unsigned<T>::type;
if constexpr (IsBigEndian()) {
return static_cast<T>(SwapBytes<U>(static_cast<U>(val)));
return static_cast<T>(SwapEndian<U>(static_cast<U>(val)));
} else {
static_assert(IsLittleEndian());
return static_cast<T>(static_cast<U>(val));
}
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T ConvertFromBigEndian(const T val) {
return ConvertToBigEndian(val);
}
template<std::integral T>
constexpr ALWAYS_INLINE T ConvertFromLittleEndian(const T val) {
return ConvertToLittleEndian(val);
}
template<std::integral T>
constexpr ALWAYS_INLINE T ConvertToBigEndian48(const T val) {
using U = typename std::make_unsigned<T>::type;
static_assert(sizeof(T) == sizeof(u64));
@ -115,17 +114,17 @@ namespace ams::util {
return static_cast<T>(static_cast<U>(val));
} else {
static_assert(IsLittleEndian());
return static_cast<T>(SwapBytes48(static_cast<U>(val)));
return static_cast<T>(SwapEndian48(static_cast<U>(val)));
}
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T ConvertToLittleEndian48(const T val) {
using U = typename std::make_unsigned<T>::type;
static_assert(sizeof(T) == sizeof(u64));
if constexpr (IsBigEndian()) {
return static_cast<T>(SwapBytes48(static_cast<U>(val)));
return static_cast<T>(SwapEndian48(static_cast<U>(val)));
} else {
static_assert(IsLittleEndian());
AMS_ASSERT((static_cast<U>(val) & UINT64_C(0xFFFF000000000000)) == 0);
@ -133,22 +132,22 @@ namespace ams::util {
}
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T LoadBigEndian(const T *ptr) {
return ConvertToBigEndian<T>(*ptr);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE T LoadLittleEndian(const T *ptr) {
return ConvertToLittleEndian<T>(*ptr);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE void StoreBigEndian(T *ptr, T val) {
*ptr = ConvertToBigEndian<T>(val);
}
template<typename T> requires std::integral<T>
template<std::integral T>
constexpr ALWAYS_INLINE void StoreLittleEndian(T *ptr, T val) {
*ptr = ConvertToLittleEndian<T>(val);
}