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+// AsmJit - Machine code generation for C++
+//
+//  * Official AsmJit Home Page: https://asmjit.com
+//  * Official Github Repository: https://github.com/asmjit/asmjit
+//
+// Copyright (c) 2008-2020 The AsmJit Authors
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+
+#ifndef ASMJIT_CORE_FEATURES_H_INCLUDED
+#define ASMJIT_CORE_FEATURES_H_INCLUDED
+
+#include "../core/globals.h"
+#include "../core/support.h"
+
+ASMJIT_BEGIN_NAMESPACE
+
+//! \addtogroup asmjit_core
+//! \{
+
+// ============================================================================
+// [asmjit::BaseFeatures]
+// ============================================================================
+
+//! Base class that provides information about CPU features.
+//!
+//! Internally each feature is repreesnted by a single bit in an embedded
+//! bit-array, however, feature bits are defined by an architecture specific
+//! implementations, like \ref x86::Features.
+class BaseFeatures {
+public:
+  typedef Support::BitWord BitWord;
+  typedef Support::BitVectorIterator<BitWord> Iterator;
+
+  enum : uint32_t {
+    kMaxFeatures = 128,
+    kNumBitWords = kMaxFeatures / Support::kBitWordSizeInBits
+  };
+
+  BitWord _bits[kNumBitWords];
+
+  //! \name Construction & Destruction
+  //! \{
+
+  inline BaseFeatures() noexcept { reset(); }
+  inline BaseFeatures(const BaseFeatures& other) noexcept = default;
+  inline explicit BaseFeatures(Globals::NoInit_) noexcept {}
+
+  inline void reset() noexcept {
+    for (size_t i = 0; i < kNumBitWords; i++)
+      _bits[i] = 0;
+  }
+
+  //! \}
+
+  //! \name Overloaded Operators
+  //! \{
+
+  inline BaseFeatures& operator=(const BaseFeatures& other) noexcept = default;
+
+  inline bool operator==(const BaseFeatures& other) noexcept { return  eq(other); }
+  inline bool operator!=(const BaseFeatures& other) noexcept { return !eq(other); }
+
+  //! \}
+
+  //! \name Cast
+  //! \{
+
+  //! Casts this base class into a derived type `T`.
+  template<typename T>
+  inline T& as() noexcept { return static_cast<T&>(*this); }
+
+  //! Casts this base class into a derived type `T` (const).
+  template<typename T>
+  inline const T& as() const noexcept { return static_cast<const T&>(*this); }
+
+  //! \}
+
+  //! \name Accessors
+  //! \{
+
+  inline bool empty() const noexcept {
+    for (uint32_t i = 0; i < kNumBitWords; i++)
+      if (_bits[i])
+        return false;
+    return true;
+  }
+
+  //! Returns all features as array of bitwords (see \ref Support::BitWord).
+  inline BitWord* bits() noexcept { return _bits; }
+  //! Returns all features as array of bitwords (const).
+  inline const BitWord* bits() const noexcept { return _bits; }
+
+  //! Returns the number of BitWords returned by \ref bits().
+  inline size_t bitWordCount() const noexcept { return kNumBitWords; }
+
+  //! Returns \ref Support::BitVectorIterator, that can be used to iterate
+  //! all features efficiently
+  inline Iterator iterator() const noexcept {
+    return Iterator(_bits, kNumBitWords);
+  }
+
+  //! Tests whether the feature `featureId` is present.
+  inline bool has(uint32_t featureId) const noexcept {
+    ASMJIT_ASSERT(featureId < kMaxFeatures);
+
+    uint32_t idx = featureId / Support::kBitWordSizeInBits;
+    uint32_t bit = featureId % Support::kBitWordSizeInBits;
+
+    return bool((_bits[idx] >> bit) & 0x1);
+  }
+
+  //! Tests whether all features as defined by `other` are present.
+  inline bool hasAll(const BaseFeatures& other) const noexcept {
+    for (uint32_t i = 0; i < kNumBitWords; i++)
+      if ((_bits[i] & other._bits[i]) != other._bits[i])
+        return false;
+    return true;
+  }
+
+  //! \}
+
+  //! \name Utilities
+  //! \{
+
+  //! Adds the given CPU `featureId` to the list of features.
+  inline void add(uint32_t featureId) noexcept {
+    ASMJIT_ASSERT(featureId < kMaxFeatures);
+
+    uint32_t idx = featureId / Support::kBitWordSizeInBits;
+    uint32_t bit = featureId % Support::kBitWordSizeInBits;
+
+    _bits[idx] |= BitWord(1) << bit;
+  }
+
+  template<typename... Args>
+  inline void add(uint32_t featureId, Args... otherIds) noexcept {
+    add(featureId);
+    add(otherIds...);
+  }
+
+  //! Removes the given CPU `featureId` from the list of features.
+  inline void remove(uint32_t featureId) noexcept {
+    ASMJIT_ASSERT(featureId < kMaxFeatures);
+
+    uint32_t idx = featureId / Support::kBitWordSizeInBits;
+    uint32_t bit = featureId % Support::kBitWordSizeInBits;
+
+    _bits[idx] &= ~(BitWord(1) << bit);
+  }
+
+  template<typename... Args>
+  inline void remove(uint32_t featureId, Args... otherIds) noexcept {
+    remove(featureId);
+    remove(otherIds...);
+  }
+
+  inline bool eq(const BaseFeatures& other) const noexcept {
+    for (size_t i = 0; i < kNumBitWords; i++)
+      if (_bits[i] != other._bits[i])
+        return false;
+    return true;
+  }
+
+  //! \}
+};
+
+//! \}
+
+ASMJIT_END_NAMESPACE
+
+#endif // ASMJIT_CORE_FEATURES_H_INCLUDED