#ifndef LLVM_SUPPORT_MATHEXTRAS_H
#define LLVM_SUPPORT_MATHEXTRAS_H
-#include "llvm/System/DataTypes.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/SwapByteOrder.h"
+#include <cassert>
+#include <cstring>
+#include <type_traits>
+
+#ifdef _MSC_VER
+#include <intrin.h>
+#include <limits>
+#endif
namespace llvm {
+/// \brief The behavior an operation has on an input of 0.
+enum ZeroBehavior {
+ /// \brief The returned value is undefined.
+ ZB_Undefined,
+ /// \brief The returned value is numeric_limits<T>::max()
+ ZB_Max,
+ /// \brief The returned value is numeric_limits<T>::digits
+ ZB_Width
+};
+
+/// \brief 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>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, std::size_t>::type
+countTrailingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
+ (void)ZB;
+
+ if (!Val)
+ return std::numeric_limits<T>::digits;
+ if (Val & 0x1)
+ return 0;
+
+ // Bisection method.
+ std::size_t 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;
+}
+
+// Disable signed.
+template <typename T>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, std::size_t>::type
+countTrailingZeros(T Val, ZeroBehavior ZB = ZB_Width) LLVM_DELETED_FUNCTION;
+
+#if __GNUC__ >= 4 || _MSC_VER
+template <>
+inline std::size_t countTrailingZeros<uint32_t>(uint32_t Val, ZeroBehavior ZB) {
+ if (ZB != ZB_Undefined && Val == 0)
+ return 32;
+
+#if __has_builtin(__builtin_ctz) || __GNUC_PREREQ(4, 0)
+ return __builtin_ctz(Val);
+#elif _MSC_VER
+ unsigned long Index;
+ _BitScanForward(&Index, Val);
+ return Index;
+#endif
+}
+
+#if !defined(_MSC_VER) || defined(_M_X64)
+template <>
+inline std::size_t countTrailingZeros<uint64_t>(uint64_t Val, ZeroBehavior ZB) {
+ if (ZB != ZB_Undefined && Val == 0)
+ return 64;
+
+#if __has_builtin(__builtin_ctzll) || __GNUC_PREREQ(4, 0)
+ return __builtin_ctzll(Val);
+#elif _MSC_VER
+ unsigned long Index;
+ _BitScanForward64(&Index, Val);
+ return Index;
+#endif
+}
+#endif
+#endif
+
+/// \brief 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>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, std::size_t>::type
+countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) {
+ (void)ZB;
+
+ if (!Val)
+ return std::numeric_limits<T>::digits;
+
+ // Bisection method.
+ std::size_t 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;
+}
+
+// Disable signed.
+template <typename T>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, std::size_t>::type
+countLeadingZeros(T Val, ZeroBehavior ZB = ZB_Width) LLVM_DELETED_FUNCTION;
+
+#if __GNUC__ >= 4 || _MSC_VER
+template <>
+inline std::size_t countLeadingZeros<uint32_t>(uint32_t Val, ZeroBehavior ZB) {
+ if (ZB != ZB_Undefined && Val == 0)
+ return 32;
+
+#if __has_builtin(__builtin_clz) || __GNUC_PREREQ(4, 0)
+ return __builtin_clz(Val);
+#elif _MSC_VER
+ unsigned long Index;
+ _BitScanReverse(&Index, Val);
+ return Index ^ 31;
+#endif
+}
+
+#if !defined(_MSC_VER) || defined(_M_X64)
+template <>
+inline std::size_t countLeadingZeros<uint64_t>(uint64_t Val, ZeroBehavior ZB) {
+ if (ZB != ZB_Undefined && Val == 0)
+ return 64;
+
+#if __has_builtin(__builtin_clzll) || __GNUC_PREREQ(4, 0)
+ return __builtin_clzll(Val);
+#elif _MSC_VER
+ unsigned long Index;
+ _BitScanReverse64(&Index, Val);
+ return Index ^ 63;
+#endif
+}
+#endif
+#endif
+
+/// \brief Get the index of the first set bit starting from the least
+/// significant bit.
+///
+/// Only unsigned integral types are allowed.
+///
+/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
+/// valid arguments.
+template <typename T>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, T>::type
+findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) {
+ if (ZB == ZB_Max && Val == 0)
+ return std::numeric_limits<T>::max();
+
+ return countTrailingZeros(Val, ZB_Undefined);
+}
+
+// Disable signed.
+template <typename T>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, T>::type
+findFirstSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
+
+/// \brief Get the index of the last set bit starting from the least
+/// significant bit.
+///
+/// Only unsigned integral types are allowed.
+///
+/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
+/// valid arguments.
+template <typename T>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ !std::numeric_limits<T>::is_signed, T>::type
+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);
+}
+
+// Disable signed.
+template <typename T>
+typename std::enable_if<std::numeric_limits<T>::is_integer &&
+ std::numeric_limits<T>::is_signed, T>::type
+findLastSet(T Val, ZeroBehavior ZB = ZB_Max) LLVM_DELETED_FUNCTION;
+
+/// \brief Macro compressed bit reversal table for 256 bits.
+///
+/// http://graphics.stanford.edu/~seander/bithacks.html#BitReverseTable
+static const unsigned char BitReverseTable256[256] = {
+#define R2(n) n, n + 2 * 64, n + 1 * 64, n + 3 * 64
+#define R4(n) R2(n), R2(n + 2 * 16), R2(n + 1 * 16), R2(n + 3 * 16)
+#define R6(n) R4(n), R4(n + 2 * 4), R4(n + 1 * 4), R4(n + 3 * 4)
+ R6(0), R6(2), R6(1), R6(3)
+#undef R2
+#undef R4
+#undef R6
+};
+
+/// \brief Reverse the bits in \p Val.
+template <typename T>
+T reverseBits(T Val) {
+ unsigned char in[sizeof(Val)];
+ unsigned char out[sizeof(Val)];
+ std::memcpy(in, &Val, sizeof(Val));
+ for (unsigned i = 0; i < sizeof(Val); ++i)
+ out[(sizeof(Val) - i) - 1] = BitReverseTable256[in[i]];
+ std::memcpy(&Val, out, sizeof(Val));
+ return Val;
+}
// NOTE: The following support functions use the _32/_64 extensions instead of
// type overloading so that signed and unsigned integers can be used without
return static_cast<uint32_t>(Value);
}
+/// Make_64 - This functions makes a 64-bit integer from a high / low pair of
+/// 32-bit integers.
+inline uint64_t Make_64(uint32_t High, uint32_t Low) {
+ return ((uint64_t)High << 32) | (uint64_t)Low;
+}
+
/// isInt - Checks if an integer fits into the given bit width.
template<unsigned N>
inline bool isInt(int64_t x) {
return static_cast<int32_t>(x) == x;
}
+/// isShiftedInt<N,S> - Checks if a signed integer is an N bit number shifted
+/// left by S.
+template<unsigned N, unsigned S>
+inline bool isShiftedInt(int64_t x) {
+ return isInt<N+S>(x) && (x % (1<<S) == 0);
+}
+
/// isUInt - Checks if an unsigned integer fits into the given bit width.
template<unsigned N>
inline bool isUInt(uint64_t x) {
- return N >= 64 || x < (UINT64_C(1)<<N);
+ return N >= 64 || x < (UINT64_C(1)<<(N));
}
// Template specializations to get better code for common cases.
template<>
return static_cast<uint32_t>(x) == x;
}
+/// isShiftedUInt<N,S> - Checks if a unsigned integer is an N bit number shifted
+/// left by S.
+template<unsigned N, unsigned S>
+inline bool isShiftedUInt(uint64_t x) {
+ return isUInt<N+S>(x) && (x % (1<<S) == 0);
+}
+
+/// isUIntN - Checks if an unsigned integer fits into the given (dynamic)
+/// bit width.
+inline bool isUIntN(unsigned N, uint64_t x) {
+ return x == (x & (~0ULL >> (64 - N)));
+}
+
+/// isIntN - Checks if an signed integer fits into the given (dynamic)
+/// bit width.
+inline bool isIntN(unsigned N, int64_t x) {
+ return N >= 64 || (-(INT64_C(1)<<(N-1)) <= x && x < (INT64_C(1)<<(N-1)));
+}
+
/// isMask_32 - This function returns true if the argument is a sequence of ones
/// starting at the least significant bit with the remainder zero (32 bit
/// version). Ex. isMask_32(0x0000FFFFU) == true.
/// ByteSwap_16 - This function returns a byte-swapped representation of the
/// 16-bit argument, Value.
inline uint16_t ByteSwap_16(uint16_t Value) {
-#if defined(_MSC_VER) && !defined(_DEBUG)
- // The DLL version of the runtime lacks these functions (bug!?), but in a
- // release build they're replaced with BSWAP instructions anyway.
- return _byteswap_ushort(Value);
-#else
- uint16_t Hi = Value << 8;
- uint16_t Lo = Value >> 8;
- return Hi | Lo;
-#endif
+ return sys::SwapByteOrder_16(Value);
}
/// ByteSwap_32 - This function returns a byte-swapped representation of the
/// 32-bit argument, Value.
inline uint32_t ByteSwap_32(uint32_t Value) {
-#if defined(__llvm__) || \
- (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
- return __builtin_bswap32(Value);
-#elif defined(_MSC_VER) && !defined(_DEBUG)
- return _byteswap_ulong(Value);
-#else
- uint32_t Byte0 = Value & 0x000000FF;
- uint32_t Byte1 = Value & 0x0000FF00;
- uint32_t Byte2 = Value & 0x00FF0000;
- uint32_t Byte3 = Value & 0xFF000000;
- return (Byte0 << 24) | (Byte1 << 8) | (Byte2 >> 8) | (Byte3 >> 24);
-#endif
+ return sys::SwapByteOrder_32(Value);
}
/// ByteSwap_64 - This function returns a byte-swapped representation of the
/// 64-bit argument, Value.
inline uint64_t ByteSwap_64(uint64_t Value) {
-#if defined(__llvm__) || \
- (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)) && !defined(__ICC)
- return __builtin_bswap64(Value);
-#elif defined(_MSC_VER) && !defined(_DEBUG)
- return _byteswap_uint64(Value);
-#else
- uint64_t Hi = ByteSwap_32(uint32_t(Value));
- uint32_t Lo = ByteSwap_32(uint32_t(Value >> 32));
- return (Hi << 32) | Lo;
-#endif
-}
-
-/// CountLeadingZeros_32 - this function performs the platform optimal form of
-/// counting the number of zeros from the most significant bit to the first one
-/// bit. Ex. CountLeadingZeros_32(0x00F000FF) == 8.
-/// Returns 32 if the word is zero.
-inline unsigned CountLeadingZeros_32(uint32_t Value) {
- unsigned Count; // result
-#if __GNUC__ >= 4
- // PowerPC is defined for __builtin_clz(0)
-#if !defined(__ppc__) && !defined(__ppc64__)
- if (!Value) return 32;
-#endif
- Count = __builtin_clz(Value);
-#else
- if (!Value) return 32;
- Count = 0;
- // bisection method for count leading zeros
- for (unsigned Shift = 32 >> 1; Shift; Shift >>= 1) {
- uint32_t Tmp = Value >> Shift;
- if (Tmp) {
- Value = Tmp;
- } else {
- Count |= Shift;
- }
- }
-#endif
- return Count;
+ return sys::SwapByteOrder_64(Value);
}
/// CountLeadingOnes_32 - this function performs the operation of
/// bit. Ex. CountLeadingOnes_32(0xFF0FFF00) == 8.
/// Returns 32 if the word is all ones.
inline unsigned CountLeadingOnes_32(uint32_t Value) {
- return CountLeadingZeros_32(~Value);
-}
-
-/// CountLeadingZeros_64 - This function performs the platform optimal form
-/// of counting the number of zeros from the most significant bit to the first
-/// one bit (64 bit edition.)
-/// Returns 64 if the word is zero.
-inline unsigned CountLeadingZeros_64(uint64_t Value) {
- unsigned Count; // result
-#if __GNUC__ >= 4
- // PowerPC is defined for __builtin_clzll(0)
-#if !defined(__ppc__) && !defined(__ppc64__)
- if (!Value) return 64;
-#endif
- Count = __builtin_clzll(Value);
-#else
- if (sizeof(long) == sizeof(int64_t)) {
- if (!Value) return 64;
- Count = 0;
- // bisection method for count leading zeros
- for (unsigned Shift = 64 >> 1; Shift; Shift >>= 1) {
- uint64_t Tmp = Value >> Shift;
- if (Tmp) {
- Value = Tmp;
- } else {
- Count |= Shift;
- }
- }
- } else {
- // get hi portion
- uint32_t Hi = Hi_32(Value);
-
- // if some bits in hi portion
- if (Hi) {
- // leading zeros in hi portion plus all bits in lo portion
- Count = CountLeadingZeros_32(Hi);
- } else {
- // get lo portion
- uint32_t Lo = Lo_32(Value);
- // same as 32 bit value
- Count = CountLeadingZeros_32(Lo)+32;
- }
- }
-#endif
- return Count;
+ return countLeadingZeros(~Value);
}
/// CountLeadingOnes_64 - This function performs the operation
/// zero bit (64 bit edition.)
/// Returns 64 if the word is all ones.
inline unsigned CountLeadingOnes_64(uint64_t Value) {
- return CountLeadingZeros_64(~Value);
-}
-
-/// CountTrailingZeros_32 - this function performs the platform optimal form of
-/// counting the number of zeros from the least significant bit to the first one
-/// bit. Ex. CountTrailingZeros_32(0xFF00FF00) == 8.
-/// Returns 32 if the word is zero.
-inline unsigned CountTrailingZeros_32(uint32_t Value) {
-#if __GNUC__ >= 4
- return Value ? __builtin_ctz(Value) : 32;
-#else
- static const unsigned Mod37BitPosition[] = {
- 32, 0, 1, 26, 2, 23, 27, 0, 3, 16, 24, 30, 28, 11, 0, 13,
- 4, 7, 17, 0, 25, 22, 31, 15, 29, 10, 12, 6, 0, 21, 14, 9,
- 5, 20, 8, 19, 18
- };
- return Mod37BitPosition[(-Value & Value) % 37];
-#endif
+ return countLeadingZeros(~Value);
}
/// CountTrailingOnes_32 - this function performs the operation of
/// bit. Ex. CountTrailingOnes_32(0x00FF00FF) == 8.
/// Returns 32 if the word is all ones.
inline unsigned CountTrailingOnes_32(uint32_t Value) {
- return CountTrailingZeros_32(~Value);
-}
-
-/// CountTrailingZeros_64 - This function performs the platform optimal form
-/// of counting the number of zeros from the least significant bit to the first
-/// one bit (64 bit edition.)
-/// Returns 64 if the word is zero.
-inline unsigned CountTrailingZeros_64(uint64_t Value) {
-#if __GNUC__ >= 4
- return Value ? __builtin_ctzll(Value) : 64;
-#else
- static const unsigned Mod67Position[] = {
- 64, 0, 1, 39, 2, 15, 40, 23, 3, 12, 16, 59, 41, 19, 24, 54,
- 4, 64, 13, 10, 17, 62, 60, 28, 42, 30, 20, 51, 25, 44, 55,
- 47, 5, 32, 65, 38, 14, 22, 11, 58, 18, 53, 63, 9, 61, 27,
- 29, 50, 43, 46, 31, 37, 21, 57, 52, 8, 26, 49, 45, 36, 56,
- 7, 48, 35, 6, 34, 33, 0
- };
- return Mod67Position[(-Value & Value) % 67];
-#endif
+ return countTrailingZeros(~Value);
}
/// CountTrailingOnes_64 - This function performs the operation
/// zero bit (64 bit edition.)
/// Returns 64 if the word is all ones.
inline unsigned CountTrailingOnes_64(uint64_t Value) {
- return CountTrailingZeros_64(~Value);
+ return countTrailingZeros(~Value);
}
/// CountPopulation_32 - this function counts the number of set bits in a 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 31 - CountLeadingZeros_32(Value);
+ return 31 - countLeadingZeros(Value);
}
/// Log2_64 - This function returns 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 63 - CountLeadingZeros_64(Value);
+ return 63 - countLeadingZeros(Value);
}
/// Log2_32_Ceil - This function returns 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 32-CountLeadingZeros_32(Value-1);
+ return 32 - countLeadingZeros(Value - 1);
}
/// Log2_64_Ceil - This function returns 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 64-CountLeadingZeros_64(Value-1);
+ return 64 - countLeadingZeros(Value - 1);
}
/// GreatestCommonDivisor64 - Return the greatest common divisor of the two
/// MinAlign - A and B are either alignments or offsets. Return the minimum
/// alignment that may be assumed after adding the two together.
-static inline uint64_t MinAlign(uint64_t A, uint64_t B) {
+inline uint64_t MinAlign(uint64_t A, uint64_t B) {
// The largest power of 2 that divides both A and B.
- return (A | B) & -(A | B);
+ //
+ // Replace "-Value" by "1+~Value" in the following commented code to avoid
+ // MSVC warning C4146
+ // return (A | B) & -(A | B);
+ return (A | B) & (1 + ~(A | B));
+}
+
+/// \brief Aligns \c Addr to \c Alignment bytes, rounding up.
+///
+/// Alignment should be a power of two. This method rounds up, so
+/// alignAddr(7, 4) == 8 and alignAddr(8, 4) == 8.
+inline uintptr_t alignAddr(void *Addr, size_t Alignment) {
+ assert(Alignment && isPowerOf2_64((uint64_t)Alignment) &&
+ "Alignment is not a power of two!");
+
+ assert((uintptr_t)Addr + Alignment - 1 >= (uintptr_t)Addr);
+
+ return (((uintptr_t)Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1));
+}
+
+/// \brief Returns the necessary adjustment for aligning \c Ptr to \c Alignment
+/// bytes, rounding up.
+inline size_t alignmentAdjustment(void *Ptr, size_t Alignment) {
+ return alignAddr(Ptr, Alignment) - (uintptr_t)Ptr;
}
/// NextPowerOf2 - Returns the next power of two (in 64-bits)
/// that is strictly greater than A. Returns zero on overflow.
-static inline uint64_t NextPowerOf2(uint64_t A) {
+inline uint64_t NextPowerOf2(uint64_t A) {
A |= (A >> 1);
A |= (A >> 2);
A |= (A >> 4);
return A + 1;
}
-/// RoundUpToAlignment - Returns the next integer (mod 2**64) that is
-/// greater than or equal to \arg Value and is a multiple of \arg
-/// Align. Align must be non-zero.
+/// 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));
+}
+
+/// 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.
///
/// Examples:
-/// RoundUpToAlignment(5, 8) = 8
-/// RoundUpToAlignment(17, 8) = 24
-/// RoundUpToAlignment(~0LL, 8) = 0
+/// \code
+/// RoundUpToAlignment(5, 8) = 8
+/// RoundUpToAlignment(17, 8) = 24
+/// RoundUpToAlignment(~0LL, 8) = 0
+/// \endcode
inline uint64_t RoundUpToAlignment(uint64_t Value, uint64_t Align) {
return ((Value + Align - 1) / Align) * Align;
}
-/// OffsetToAlignment - Return the offset to the next integer (mod 2**64) that
-/// is greater than or equal to \arg Value and is a multiple of \arg
-/// Align. Align must be non-zero.
+/// Returns the offset to 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.
inline uint64_t OffsetToAlignment(uint64_t Value, uint64_t Align) {
return RoundUpToAlignment(Value, Align) - Value;
}
return int32_t(x << (32 - B)) >> (32 - B);
}
+/// \brief Sign extend number in the bottom B bits of X to a 32-bit int.
+/// Requires 0 < B <= 32.
+inline int32_t SignExtend32(uint32_t X, unsigned B) {
+ return int32_t(X << (32 - B)) >> (32 - B);
+}
+
/// SignExtend64 - Sign extend B-bit number x to 64-bit int.
/// Usage int64_t r = SignExtend64<5>(x);
template <unsigned B> inline int64_t SignExtend64(uint64_t x) {
return int64_t(x << (64 - B)) >> (64 - B);
}
+/// \brief Sign extend number in the bottom B bits of X to a 64-bit int.
+/// Requires 0 < B <= 64.
+inline int64_t SignExtend64(uint64_t X, unsigned B) {
+ return int64_t(X << (64 - B)) >> (64 - B);
+}
+
+#if defined(_MSC_VER)
+ // Visual Studio defines the HUGE_VAL class of macros using purposeful
+ // constant arithmetic overflow, which it then warns on when encountered.
+ const float huge_valf = std::numeric_limits<float>::infinity();
+#else
+ const float huge_valf = HUGE_VALF;
+#endif
} // End llvm namespace
#endif
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