#include "llvm/Support/Compiler.h"
#include "llvm/Support/SwapByteOrder.h"
-#include "llvm/Support/type_traits.h"
-
+#include <cassert>
#include <cstring>
+#include <type_traits>
#ifdef _MSC_VER
-# include <intrin.h>
+#include <intrin.h>
+#include <limits>
#endif
namespace llvm {
/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, std::size_t>::type
+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)
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, std::size_t>::type
+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
if (ZB != ZB_Undefined && Val == 0)
return 32;
-#if __GNUC__ >= 4
+#if __has_builtin(__builtin_ctz) || __GNUC_PREREQ(4, 0)
return __builtin_ctz(Val);
#elif _MSC_VER
unsigned long Index;
if (ZB != ZB_Undefined && Val == 0)
return 64;
-#if __GNUC__ >= 4
+#if __has_builtin(__builtin_ctzll) || __GNUC_PREREQ(4, 0)
return __builtin_ctzll(Val);
#elif _MSC_VER
unsigned long Index;
/// \param ZB the behavior on an input of 0. Only ZB_Width and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, std::size_t>::type
+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;
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, std::size_t>::type
+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
if (ZB != ZB_Undefined && Val == 0)
return 32;
-#if __GNUC__ >= 4
+#if __has_builtin(__builtin_clz) || __GNUC_PREREQ(4, 0)
return __builtin_clz(Val);
#elif _MSC_VER
unsigned long Index;
if (ZB != ZB_Undefined && Val == 0)
return 64;
-#if __GNUC__ >= 4
+#if __has_builtin(__builtin_clzll) || __GNUC_PREREQ(4, 0)
return __builtin_clzll(Val);
#elif _MSC_VER
unsigned long Index;
/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, T>::type
+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();
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, T>::type
+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
/// \param ZB the behavior on an input of 0. Only ZB_Max and ZB_Undefined are
/// valid arguments.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- !std::numeric_limits<T>::is_signed, T>::type
+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();
// Disable signed.
template <typename T>
-typename enable_if_c<std::numeric_limits<T>::is_integer &&
- std::numeric_limits<T>::is_signed, T>::type
+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.
#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.
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 sys::SwapByteOrder_64(Value);
}
-/// 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;
-}
-
/// CountLeadingOnes_32 - this function performs the operation of
/// counting the number of ones from the most significant bit to the first zero
/// 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
- };
- // Replace "-Value" by "1+~Value" in the following commented code to avoid
- // MSVC warning C4146
- // return Mod37BitPosition[(-Value & Value) % 37];
- return Mod37BitPosition[((1 + ~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
- };
- // Replace "-Value" by "1+~Value" in the following commented code to avoid
- // MSVC warning C4146
- // return Mod67Position[(-Value & Value) % 67];
- return Mod67Position[((1 + ~Value) & Value) % 67];
-#endif
+ return countTrailingZeros(~Value);
}
/// CountTrailingOnes_64 - This function performs the operation
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.
inline uint64_t NextPowerOf2(uint64_t A) {
return A + 1;
}
+/// 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.
///
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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