#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 (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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