mirrors/Atmosphere
1
0
Fork 0
mirror of https://github.com/Atmosphere-NX/Atmosphere.git synced 2025-05-23 11:16:57 -04:00
Code Issues Projects Releases Packages Wiki Activity

util: update some bit utility logic

Browse source
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
Download patch file Download diff file Expand all files Collapse all files

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);
}