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[wpiutil] Upgrade to LLVM 16.0.6 (#5435)

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Fixes #5332.
This commit is contained in:
Tyler Veness
2023-07-12 22:50:13 -07:00
committed by GitHub
parent 701df9eb87
commit 828bc5276f
77 changed files with 3798 additions and 1879 deletions
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455
wpiutil/src/main/native/thirdparty/llvm/include/wpi/MathExtras.h vendored
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@@ -13,31 +13,16 @@
#ifndef WPIUTIL_WPI_MATHEXTRAS_H
#define WPIUTIL_WPI_MATHEXTRAS_H
#include "wpi/bit.h"
#include "wpi/Compiler.h"
#include <bit>
#include <cassert>
#include <climits>
#include <cmath>
#include <cstdint>
#include <cstring>
#include <limits>
#include <type_traits>
#ifdef __ANDROID_NDK__
#include <android/api-level.h>
#endif
#ifdef _MSC_VER
// Declare these intrinsics manually rather including intrin.h. It's very
// expensive, and MathExtras.h is popular.
// #include <intrin.h>
extern "C" {
unsigned char _BitScanForward(unsigned long *_Index, unsigned long _Mask);
unsigned char _BitScanForward64(unsigned long *_Index, unsigned __int64 _Mask);
unsigned char _BitScanReverse(unsigned long *_Index, unsigned long _Mask);
unsigned char _BitScanReverse64(unsigned long *_Index, unsigned __int64 _Mask);
}
#endif
namespace wpi {
/// The behavior an operation has on an input of 0.
@@ -45,152 +30,31 @@ enum ZeroBehavior {
/// The returned value is undefined.
ZB_Undefined,
/// The returned value is numeric_limits<T>::max()
ZB_Max,
/// The returned value is numeric_limits<T>::digits
ZB_Width
ZB_Max
};
namespace detail {
template <typename T, std::size_t SizeOfT> struct TrailingZerosCounter {
static unsigned count(T Val, ZeroBehavior) {
if (!Val)
return std::numeric_limits<T>::digits;
if (Val & 0x1)
return 0;
// Bisection method.
unsigned ZeroBits = 0;
T Shift = std::numeric_limits<T>::digits >> 1;
T Mask = (std::numeric_limits<T>::max)() >> Shift;
while (Shift) {
if ((Val & Mask) == 0) {
Val >>= Shift;
ZeroBits |= Shift;
}
Shift >>= 1;
Mask >>= Shift;
}
return ZeroBits;
}
};
#if defined(__GNUC__) || defined(_MSC_VER)
template <typename T> struct TrailingZerosCounter<T, 4> {
static unsigned count(T Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 32;
#if __has_builtin(__builtin_ctz) || defined(__GNUC__)
return __builtin_ctz(Val);
#elif defined(_MSC_VER)
unsigned long Index;
_BitScanForward(&Index, Val);
return Index;
#endif
}
};
#if !defined(_MSC_VER) || defined(_M_X64)
template <typename T> struct TrailingZerosCounter<T, 8> {
static unsigned count(T Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 64;
#if __has_builtin(__builtin_ctzll) || defined(__GNUC__)
return __builtin_ctzll(Val);
#elif defined(_MSC_VER)
unsigned long Index;
_BitScanForward64(&Index, Val);
return Index;
#endif
}
};
#endif
#endif
} // namespace detail
/// Count number of 0's from the least significant bit to the most
/// stopping at the first 1.
///
/// Only unsigned integral types are allowed.
///
/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
/// valid arguments.
template <typename T>
unsigned countTrailingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
static_assert(std::numeric_limits<T>::is_integer &&
!std::numeric_limits<T>::is_signed,
/// Returns std::numeric_limits<T>::digits on an input of 0.
template <typename T> unsigned countTrailingZeros(T Val) {
static_assert(std::is_unsigned_v<T>,
"Only unsigned integral types are allowed.");
return wpi::detail::TrailingZerosCounter<T, sizeof(T)>::count(Val, ZB);
return std::countr_zero(Val);
}
namespace detail {
template <typename T, std::size_t SizeOfT> struct LeadingZerosCounter {
static unsigned count(T Val, ZeroBehavior) {
if (!Val)
return std::numeric_limits<T>::digits;
// Bisection method.
unsigned ZeroBits = 0;
for (T Shift = std::numeric_limits<T>::digits >> 1; Shift; Shift >>= 1) {
T Tmp = Val >> Shift;
if (Tmp)
Val = Tmp;
else
ZeroBits |= Shift;
}
return ZeroBits;
}
};
#if defined(__GNUC__) || defined(_MSC_VER)
template <typename T> struct LeadingZerosCounter<T, 4> {
static unsigned count(T Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 32;
#if __has_builtin(__builtin_clz) || defined(__GNUC__)
return __builtin_clz(Val);
#elif defined(_MSC_VER)
unsigned long Index;
_BitScanReverse(&Index, Val);
return Index ^ 31;
#endif
}
};
#if !defined(_MSC_VER) || defined(_M_X64)
template <typename T> struct LeadingZerosCounter<T, 8> {
static unsigned count(T Val, ZeroBehavior ZB) {
if (ZB != ZB_Undefined && Val == 0)
return 64;
#if __has_builtin(__builtin_clzll) || defined(__GNUC__)
return __builtin_clzll(Val);
#elif defined(_MSC_VER)
unsigned long Index;
_BitScanReverse64(&Index, Val);
return Index ^ 63;
#endif
}
};
#endif
#endif
} // namespace detail
/// Count number of 0's from the most significant bit to the least
/// stopping at the first 1.
///
/// Only unsigned integral types are allowed.
///
/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
/// valid arguments.
template <typename T>
unsigned countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
static_assert(std::numeric_limits<T>::is_integer &&
!std::numeric_limits<T>::is_signed,
/// Returns std::numeric_limits<T>::digits on an input of 0.
template <typename T> unsigned countLeadingZeros(T Val) {
static_assert(std::is_unsigned_v<T>,
"Only unsigned integral types are allowed.");
return wpi::detail::LeadingZerosCounter<T, sizeof(T)>::count(Val, ZB);
return std::countl_zero(Val);
}
/// Get the index of the first set bit starting from the least
@@ -198,13 +62,12 @@ unsigned countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
///
/// Only unsigned integral types are allowed.
///
/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
/// valid arguments.
/// \param ZB the behavior on an input of 0.
template <typename T> T findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
if (ZB == ZB_Max && Val == 0)
return (std::numeric_limits<T>::max)();
return countTrailingZeros(Val, ZB_Undefined);
return std::countr_zero(Val);
}
/// Create a bitmask with the N right-most bits set to 1, and all other
@@ -239,16 +102,14 @@ template <typename T> T maskLeadingZeros(unsigned N) {
///
/// Only unsigned integral types are allowed.
///
/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
/// valid arguments.
/// \param ZB the behavior on an input of 0.
template <typename T> T findLastSet(T Val, ZeroBehavior ZB = ZB_Max) {
if (ZB == ZB_Max && Val == 0)
return (std::numeric_limits<T>::max)();
// Use ^ instead of - because both gcc and llvm can remove the associated ^
// in the __builtin_clz intrinsic on x86.
return countLeadingZeros(Val, ZB_Undefined) ^
(std::numeric_limits<T>::digits - 1);
return std::countl_zero(Val) ^ (std::numeric_limits<T>::digits - 1);
}
/// Macro compressed bit reversal table for 256 bits.
@@ -265,8 +126,24 @@ static const unsigned char BitReverseTable256[256] = {
};
/// Reverse the bits in \p Val.
template <typename T>
T reverseBits(T Val) {
template <typename T> T reverseBits(T Val) {
#if __has_builtin(__builtin_bitreverse8)
if constexpr (std::is_same_v<T, uint8_t>)
return __builtin_bitreverse8(Val);
#endif
#if __has_builtin(__builtin_bitreverse16)
if constexpr (std::is_same_v<T, uint16_t>)
return __builtin_bitreverse16(Val);
#endif
#if __has_builtin(__builtin_bitreverse32)
if constexpr (std::is_same_v<T, uint32_t>)
return __builtin_bitreverse32(Val);
#endif
#if __has_builtin(__builtin_bitreverse64)
if constexpr (std::is_same_v<T, uint64_t>)
return __builtin_bitreverse64(Val);
#endif
unsigned char in[sizeof(Val)];
unsigned char out[sizeof(Val)];
std::memcpy(in, &Val, sizeof(Val));
@@ -276,34 +153,6 @@ T reverseBits(T Val) {
return Val;
}
#if __has_builtin(__builtin_bitreverse8)
template<>
inline uint8_t reverseBits<uint8_t>(uint8_t Val) {
return __builtin_bitreverse8(Val);
}
#endif
#if __has_builtin(__builtin_bitreverse16)
template<>
inline uint16_t reverseBits<uint16_t>(uint16_t Val) {
return __builtin_bitreverse16(Val);
}
#endif
#if __has_builtin(__builtin_bitreverse32)
template<>
inline uint32_t reverseBits<uint32_t>(uint32_t Val) {
return __builtin_bitreverse32(Val);
}
#endif
#if __has_builtin(__builtin_bitreverse64)
template<>
inline uint64_t reverseBits<uint64_t>(uint64_t Val) {
return __builtin_bitreverse64(Val);
}
#endif
// NOTE: The following support functions use the _32/_64 extensions instead of
// type overloading so that signed and unsigned integers can be used without
// ambiguity.
@@ -325,17 +174,16 @@ constexpr inline uint64_t Make_64(uint32_t High, uint32_t Low) {
/// Checks if an integer fits into the given bit width.
template <unsigned N> constexpr inline bool isInt(int64_t x) {
return N >= 64 || (-(INT64_C(1)<<(N-1)) <= x && x < (INT64_C(1)<<(N-1)));
}
// Template specializations to get better code for common cases.
template <> constexpr inline bool isInt<8>(int64_t x) {
return static_cast<int8_t>(x) == x;
}
template <> constexpr inline bool isInt<16>(int64_t x) {
return static_cast<int16_t>(x) == x;
}
template <> constexpr inline bool isInt<32>(int64_t x) {
return static_cast<int32_t>(x) == x;
if constexpr (N == 8)
return static_cast<int8_t>(x) == x;
if constexpr (N == 16)
return static_cast<int16_t>(x) == x;
if constexpr (N == 32)
return static_cast<int32_t>(x) == x;
if constexpr (N < 64)
return -(INT64_C(1) << (N - 1)) <= x && x < (INT64_C(1) << (N - 1));
(void)x; // MSVC v19.25 warns that x is unused.
return true;
}
/// Checks if a signed integer is an N bit number shifted left by S.
@@ -348,34 +196,20 @@ constexpr inline bool isShiftedInt(int64_t x) {
}
/// Checks if an unsigned integer fits into the given bit width.
///
/// This is written as two functions rather than as simply
///
/// return N >= 64 || X < (UINT64_C(1) << N);
///
/// to keep MSVC from (incorrectly) warning on isUInt<64> that we're shifting
/// left too many places.
template <unsigned N>
constexpr inline std::enable_if_t<(N < 64), bool> isUInt(uint64_t X) {
template <unsigned N> constexpr inline bool isUInt(uint64_t x) {
static_assert(N > 0, "isUInt<0> doesn't make sense");
return X < (UINT64_C(1) << (N));
}
template <unsigned N>
constexpr inline std::enable_if_t<N >= 64, bool> isUInt(uint64_t) {
if constexpr (N == 8)
return static_cast<uint8_t>(x) == x;
if constexpr (N == 16)
return static_cast<uint16_t>(x) == x;
if constexpr (N == 32)
return static_cast<uint32_t>(x) == x;
if constexpr (N < 64)
return x < (UINT64_C(1) << (N));
(void)x; // MSVC v19.25 warns that x is unused.
return true;
}
// Template specializations to get better code for common cases.
template <> constexpr inline bool isUInt<8>(uint64_t x) {
return static_cast<uint8_t>(x) == x;
}
template <> constexpr inline bool isUInt<16>(uint64_t x) {
return static_cast<uint16_t>(x) == x;
}
template <> constexpr inline bool isUInt<32>(uint64_t x) {
return static_cast<uint32_t>(x) == x;
}
/// Checks if a unsigned integer is an N bit number shifted left by S.
template <unsigned N, unsigned S>
constexpr inline bool isShiftedUInt(uint64_t x) {
@@ -462,12 +296,12 @@ constexpr inline bool isShiftedMask_64(uint64_t Value) {
/// Return true if the argument is a power of two > 0.
/// Ex. isPowerOf2_32(0x00100000U) == true (32 bit edition.)
constexpr inline bool isPowerOf2_32(uint32_t Value) {
return Value && !(Value & (Value - 1));
return std::has_single_bit(Value);
}
/// Return true if the argument is a power of two > 0 (64 bit edition.)
constexpr inline bool isPowerOf2_64(uint64_t Value) {
return Value && !(Value & (Value - 1));
return std::has_single_bit(Value);
}
/// Count the number of ones from the most significant bit to the first
@@ -476,14 +310,11 @@ constexpr inline bool isPowerOf2_64(uint64_t Value) {
/// Ex. countLeadingOnes(0xFF0FFF00) == 8.
/// Only unsigned integral types are allowed.
///
/// \param ZB the behavior on an input of all ones. Only ZB_Width and
/// ZB_Undefined are valid arguments.
template <typename T>
unsigned countLeadingOnes(T Value, ZeroBehavior ZB = ZB_Width) {
static_assert(std::numeric_limits<T>::is_integer &&
!std::numeric_limits<T>::is_signed,
/// Returns std::numeric_limits<T>::digits on an input of all ones.
template <typename T> unsigned countLeadingOnes(T Value) {
static_assert(std::is_unsigned_v<T>,
"Only unsigned integral types are allowed.");
return countLeadingZeros<T>(~Value, ZB);
return std::countl_one<T>(Value);
}
/// Count the number of ones from the least significant bit to the first
@@ -492,56 +323,48 @@ unsigned countLeadingOnes(T Value, ZeroBehavior ZB = ZB_Width) {
/// Ex. countTrailingOnes(0x00FF00FF) == 8.
/// Only unsigned integral types are allowed.
///
/// \param ZB the behavior on an input of all ones. Only ZB_Width and
/// ZB_Undefined are valid arguments.
template <typename T>
unsigned countTrailingOnes(T Value, ZeroBehavior ZB = ZB_Width) {
static_assert(std::numeric_limits<T>::is_integer &&
!std::numeric_limits<T>::is_signed,
/// Returns std::numeric_limits<T>::digits on an input of all ones.
template <typename T> unsigned countTrailingOnes(T Value) {
static_assert(std::is_unsigned_v<T>,
"Only unsigned integral types are allowed.");
return countTrailingZeros<T>(~Value, ZB);
return std::countr_one<T>(Value);
}
namespace detail {
template <typename T, std::size_t SizeOfT> struct PopulationCounter {
static unsigned count(T Value) {
// Generic version, forward to 32 bits.
static_assert(SizeOfT <= 4, "Not implemented!");
#if defined(__GNUC__)
return __builtin_popcount(Value);
#else
uint32_t v = Value;
v = v - ((v >> 1) & 0x55555555);
v = (v & 0x33333333) + ((v >> 2) & 0x33333333);
return ((v + (v >> 4) & 0xF0F0F0F) * 0x1010101) >> 24;
#endif
}
};
template <typename T> struct PopulationCounter<T, 8> {
static unsigned count(T Value) {
#if defined(__GNUC__)
return __builtin_popcountll(Value);
#else
uint64_t v = Value;
v = v - ((v >> 1) & 0x5555555555555555ULL);
v = (v & 0x3333333333333333ULL) + ((v >> 2) & 0x3333333333333333ULL);
v = (v + (v >> 4)) & 0x0F0F0F0F0F0F0F0FULL;
return unsigned((uint64_t)(v * 0x0101010101010101ULL) >> 56);
#endif
}
};
} // namespace detail
/// Count the number of set bits in a value.
/// Ex. countPopulation(0xF000F000) = 8
/// Returns 0 if the word is zero.
template <typename T>
inline unsigned countPopulation(T Value) {
static_assert(std::numeric_limits<T>::is_integer &&
!std::numeric_limits<T>::is_signed,
static_assert(std::is_unsigned_v<T>,
"Only unsigned integral types are allowed.");
return detail::PopulationCounter<T, sizeof(T)>::count(Value);
return (unsigned)std::popcount(Value);
}
/// Return true if the argument contains a non-empty sequence of ones with the
/// remainder zero (32 bit version.) Ex. isShiftedMask_32(0x0000FF00U) == true.
/// If true, \p MaskIdx will specify the index of the lowest set bit and \p
/// MaskLen is updated to specify the length of the mask, else neither are
/// updated.
inline bool isShiftedMask_32(uint32_t Value, unsigned &MaskIdx,
unsigned &MaskLen) {
if (!isShiftedMask_32(Value))
return false;
MaskIdx = std::countr_zero(Value);
MaskLen = std::popcount(Value);
return true;
}
/// Return true if the argument contains a non-empty sequence of ones with the
/// remainder zero (64 bit version.) If true, \p MaskIdx will specify the index
/// of the lowest set bit and \p MaskLen is updated to specify the length of the
/// mask, else neither are updated.
inline bool isShiftedMask_64(uint64_t Value, unsigned &MaskIdx,
unsigned &MaskLen) {
if (!isShiftedMask_64(Value))
return false;
MaskIdx = std::countr_zero(Value);
MaskLen = std::popcount(Value);
return true;
}
/// Compile time Log2.
@@ -554,90 +377,58 @@ template <size_t kValue> constexpr inline size_t CTLog2() {
template <> constexpr inline size_t CTLog2<1>() { return 0; }
/// Return the log base 2 of the specified value.
inline double Log2(double Value) {
#if defined(__ANDROID_API__) && __ANDROID_API__ < 18
return __builtin_log(Value) / __builtin_log(2.0);
#else
return std::log2(Value);
#endif
}
/// Return the floor log base 2 of the specified value, -1 if the value is zero.
/// (32 bit edition.)
/// Ex. Log2_32(32) == 5, Log2_32(1) == 0, Log2_32(0) == -1, Log2_32(6) == 2
inline unsigned Log2_32(uint32_t Value) {
return static_cast<unsigned>(31 - countLeadingZeros(Value));
return static_cast<unsigned>(31 - std::countl_zero(Value));
}
/// Return the floor log base 2 of the specified value, -1 if the value is zero.
/// (64 bit edition.)
inline unsigned Log2_64(uint64_t Value) {
return static_cast<unsigned>(63 - countLeadingZeros(Value));
return static_cast<unsigned>(63 - std::countl_zero(Value));
}
/// Return the ceil log base 2 of the specified value, 32 if the value is zero.
/// (32 bit edition).
/// Ex. Log2_32_Ceil(32) == 5, Log2_32_Ceil(1) == 0, Log2_32_Ceil(6) == 3
inline unsigned Log2_32_Ceil(uint32_t Value) {
return static_cast<unsigned>(32 - countLeadingZeros(Value - 1));
return static_cast<unsigned>(32 - std::countl_zero(Value - 1));
}
/// Return the ceil log base 2 of the specified value, 64 if the value is zero.
/// (64 bit edition.)
inline unsigned Log2_64_Ceil(uint64_t Value) {
return static_cast<unsigned>(64 - countLeadingZeros(Value - 1));
}
/// Return the greatest common divisor of the values using Euclid's algorithm.
template <typename T>
inline T greatestCommonDivisor(T A, T B) {
while (B) {
T Tmp = B;
B = A % B;
A = Tmp;
}
return A;
}
inline uint64_t GreatestCommonDivisor64(uint64_t A, uint64_t B) {
return greatestCommonDivisor<uint64_t>(A, B);
return static_cast<unsigned>(64 - std::countl_zero(Value - 1));
}
/// This function takes a 64-bit integer and returns the bit equivalent double.
inline double BitsToDouble(uint64_t Bits) {
double D;
static_assert(sizeof(uint64_t) == sizeof(double), "Unexpected type sizes");
memcpy(&D, &Bits, sizeof(Bits));
return D;
return wpi::bit_cast<double>(Bits);
}
/// This function takes a 32-bit integer and returns the bit equivalent float.
inline float BitsToFloat(uint32_t Bits) {
float F;
static_assert(sizeof(uint32_t) == sizeof(float), "Unexpected type sizes");
memcpy(&F, &Bits, sizeof(Bits));
return F;
return wpi::bit_cast<float>(Bits);
}
/// This function takes a double and returns the bit equivalent 64-bit integer.
/// Note that copying doubles around changes the bits of NaNs on some hosts,
/// notably x86, so this routine cannot be used if these bits are needed.
inline uint64_t DoubleToBits(double Double) {
uint64_t Bits;
static_assert(sizeof(uint64_t) == sizeof(double), "Unexpected type sizes");
memcpy(&Bits, &Double, sizeof(Double));
return Bits;
return wpi::bit_cast<uint64_t>(Double);
}
/// This function takes a float and returns the bit equivalent 32-bit integer.
/// Note that copying floats around changes the bits of NaNs on some hosts,
/// notably x86, so this routine cannot be used if these bits are needed.
inline uint32_t FloatToBits(float Float) {
uint32_t Bits;
static_assert(sizeof(uint32_t) == sizeof(float), "Unexpected type sizes");
memcpy(&Bits, &Float, sizeof(Float));
return Bits;
return wpi::bit_cast<uint32_t>(Float);
}
/// A and B are either alignments or offsets. Return the minimum alignment that
@@ -653,7 +444,7 @@ constexpr inline uint64_t MinAlign(uint64_t A, uint64_t B) {
/// Returns the next power of two (in 64-bits) that is strictly greater than A.
/// Returns zero on overflow.
inline uint64_t NextPowerOf2(uint64_t A) {
constexpr inline uint64_t NextPowerOf2(uint64_t A) {
A |= (A >> 1);
A |= (A >> 2);
A |= (A >> 4);
@@ -666,8 +457,7 @@ inline uint64_t NextPowerOf2(uint64_t A) {
/// Returns the power of two which is less than or equal to the given value.
/// Essentially, it is a floor operation across the domain of powers of two.
inline uint64_t PowerOf2Floor(uint64_t A) {
if (!A) return 0;
return 1ull << (63 - countLeadingZeros(A, ZB_Undefined));
return std::bit_floor(A);
}
/// Returns the power of two which is greater than or equal to the given value.
@@ -681,27 +471,40 @@ inline uint64_t PowerOf2Ceil(uint64_t A) {
/// Returns the next integer (mod 2**64) that is greater than or equal to
/// \p Value and is a multiple of \p Align. \p Align must be non-zero.
///
/// If non-zero \p Skew is specified, the return value will be a minimal
/// integer that is greater than or equal to \p Value and equal to
/// \p Align * N + \p Skew for some integer N. If \p Skew is larger than
/// \p Align, its value is adjusted to '\p Skew mod \p Align'.
///
/// Examples:
/// \code
/// alignTo(5, 8) = 8
/// alignTo(17, 8) = 24
/// alignTo(~0LL, 8) = 0
/// alignTo(321, 255) = 510
/// \endcode
inline uint64_t alignTo(uint64_t Value, uint64_t Align) {
assert(Align != 0u && "Align can't be 0.");
return (Value + Align - 1) / Align * Align;
}
inline uint64_t alignToPowerOf2(uint64_t Value, uint64_t Align) {
assert(Align != 0 && (Align & (Align - 1)) == 0 &&
"Align must be a power of 2");
return (Value + Align - 1) & -Align;
}
/// If non-zero \p Skew is specified, the return value will be a minimal integer
/// that is greater than or equal to \p Size and equal to \p A * N + \p Skew for
/// some integer N. If \p Skew is larger than \p A, its value is adjusted to '\p
/// Skew mod \p A'. \p Align must be non-zero.
///
/// Examples:
/// \code
/// alignTo(5, 8, 7) = 7
/// alignTo(17, 8, 1) = 17
/// alignTo(~0LL, 8, 3) = 3
/// alignTo(321, 255, 42) = 552
/// \endcode
inline uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew = 0) {
inline uint64_t alignTo(uint64_t Value, uint64_t Align, uint64_t Skew) {
assert(Align != 0u && "Align can't be 0.");
Skew %= Align;
return (Value + Align - 1 - Skew) / Align * Align + Skew;
return alignTo(Value - Skew, Align) + Skew;
}
/// Returns the next integer (mod 2**64) that is greater than or equal to
@@ -785,6 +588,18 @@ SaturatingAdd(T X, T Y, bool *ResultOverflowed = nullptr) {
return Z;
}
/// Add multiple unsigned integers of type T. Clamp the result to the
/// maximum representable value of T on overflow.
template <class T, class... Ts>
std::enable_if_t<std::is_unsigned_v<T>, T> SaturatingAdd(T X, T Y, T Z,
Ts... Args) {
bool Overflowed = false;
T XY = SaturatingAdd(X, Y, &Overflowed);
if (Overflowed)
return SaturatingAdd((std::numeric_limits<T>::max)(), T(1), Args...);
return SaturatingAdd(XY, Z, Args...);
}
/// Multiply two unsigned integers, X and Y, of type T. Clamp the result to the
/// maximum representable value of T on overflow. ResultOverflowed indicates if
/// the result is larger than the maximum representable value of type T.
@@ -852,7 +667,7 @@ extern const float huge_valf;
/// Add two signed integers, computing the two's complement truncated result,
/// returning true if overflow occured.
/// returning true if overflow occurred.
template <typename T>
std::enable_if_t<std::is_signed<T>::value, T> AddOverflow(T X, T Y, T &Result) {
#if __has_builtin(__builtin_add_overflow)