1 files changed, 236 insertions, 0 deletions
diff --git a/third_party/llvm-project/include/llvm/MC/SubtargetFeature.h b/third_party/llvm-project/include/llvm/MC/SubtargetFeature.h
new file mode 100644
index 000000000..defbc3c64
--- /dev/null
+++ b/third_party/llvm-project/include/llvm/MC/SubtargetFeature.h
@@ -0,0 +1,236 @@
+//===- llvm/MC/SubtargetFeature.h - CPU characteristics ---------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file Defines and manages user or tool specified CPU characteristics.
+/// The intent is to be able to package specific features that should or should
+/// not be used on a specific target processor.  A tool, such as llc, could, as
+/// as example, gather chip info from the command line, a long with features
+/// that should be used on that chip.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_SUBTARGETFEATURE_H
+#define LLVM_MC_SUBTARGETFEATURE_H
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/MathExtras.h"
+#include <array>
+#include <bitset>
+#include <initializer_list>
+#include <string>
+#include <vector>
+
+namespace llvm {
+
+class raw_ostream;
+class Triple;
+
+const unsigned MAX_SUBTARGET_WORDS = 3;
+const unsigned MAX_SUBTARGET_FEATURES = MAX_SUBTARGET_WORDS * 64;
+
+/// Container class for subtarget features.
+/// This is a constexpr reimplementation of a subset of std::bitset. It would be
+/// nice to use std::bitset directly, but it doesn't support constant
+/// initialization.
+class FeatureBitset {
+  static_assert((MAX_SUBTARGET_FEATURES % 64) == 0,
+                "Should be a multiple of 64!");
+  // This cannot be a std::array, operator[] is not constexpr until C++17.
+  uint64_t Bits[MAX_SUBTARGET_WORDS] = {};
+
+protected:
+  constexpr FeatureBitset(const std::array<uint64_t, MAX_SUBTARGET_WORDS> &B) {
+    for (unsigned I = 0; I != B.size(); ++I)
+      Bits[I] = B[I];
+  }
+
+public:
+  constexpr FeatureBitset() = default;
+  constexpr FeatureBitset(std::initializer_list<unsigned> Init) {
+    for (auto I : Init)
+      set(I);
+  }
+
+  FeatureBitset &set() {
+    std::fill(std::begin(Bits), std::end(Bits), -1ULL);
+    return *this;
+  }
+
+  constexpr FeatureBitset &set(unsigned I) {
+    // GCC <6.2 crashes if this is written in a single statement.
+    uint64_t NewBits = Bits[I / 64] | (uint64_t(1) << (I % 64));
+    Bits[I / 64] = NewBits;
+    return *this;
+  }
+
+  constexpr FeatureBitset &reset(unsigned I) {
+    // GCC <6.2 crashes if this is written in a single statement.
+    uint64_t NewBits = Bits[I / 64] & ~(uint64_t(1) << (I % 64));
+    Bits[I / 64] = NewBits;
+    return *this;
+  }
+
+  constexpr FeatureBitset &flip(unsigned I) {
+    // GCC <6.2 crashes if this is written in a single statement.
+    uint64_t NewBits = Bits[I / 64] ^ (uint64_t(1) << (I % 64));
+    Bits[I / 64] = NewBits;
+    return *this;
+  }
+
+  constexpr bool operator[](unsigned I) const {
+    uint64_t Mask = uint64_t(1) << (I % 64);
+    return (Bits[I / 64] & Mask) != 0;
+  }
+
+  constexpr bool test(unsigned I) const { return (*this)[I]; }
+
+  constexpr size_t size() const { return MAX_SUBTARGET_FEATURES; }
+
+  bool any() const {
+    return llvm::any_of(Bits, [](uint64_t I) { return I != 0; });
+  }
+  bool none() const { return !any(); }
+  size_t count() const {
+    size_t Count = 0;
+    for (auto B : Bits)
+      Count += countPopulation(B);
+    return Count;
+  }
+
+  constexpr FeatureBitset &operator^=(const FeatureBitset &RHS) {
+    for (unsigned I = 0, E = array_lengthof(Bits); I != E; ++I) {
+      Bits[I] ^= RHS.Bits[I];
+    }
+    return *this;
+  }
+  constexpr FeatureBitset operator^(const FeatureBitset &RHS) const {
+    FeatureBitset Result = *this;
+    Result ^= RHS;
+    return Result;
+  }
+
+  constexpr FeatureBitset &operator&=(const FeatureBitset &RHS) {
+    for (unsigned I = 0, E = array_lengthof(Bits); I != E; ++I) {
+      Bits[I] &= RHS.Bits[I];
+    }
+    return *this;
+  }
+  constexpr FeatureBitset operator&(const FeatureBitset &RHS) const {
+    FeatureBitset Result = *this;
+    Result &= RHS;
+    return Result;
+  }
+
+  constexpr FeatureBitset &operator|=(const FeatureBitset &RHS) {
+    for (unsigned I = 0, E = array_lengthof(Bits); I != E; ++I) {
+      Bits[I] |= RHS.Bits[I];
+    }
+    return *this;
+  }
+  constexpr FeatureBitset operator|(const FeatureBitset &RHS) const {
+    FeatureBitset Result = *this;
+    Result |= RHS;
+    return Result;
+  }
+
+  constexpr FeatureBitset operator~() const {
+    FeatureBitset Result = *this;
+    for (auto &B : Result.Bits)
+      B = ~B;
+    return Result;
+  }
+
+  bool operator==(const FeatureBitset &RHS) const {
+    return std::equal(std::begin(Bits), std::end(Bits), std::begin(RHS.Bits));
+  }
+
+  bool operator!=(const FeatureBitset &RHS) const { return !(*this == RHS); }
+
+  bool operator < (const FeatureBitset &Other) const {
+    for (unsigned I = 0, E = size(); I != E; ++I) {
+      bool LHS = test(I), RHS = Other.test(I);
+      if (LHS != RHS)
+        return LHS < RHS;
+    }
+    return false;
+  }
+};
+
+/// Class used to store the subtarget bits in the tables created by tablegen.
+class FeatureBitArray : public FeatureBitset {
+public:
+  constexpr FeatureBitArray(const std::array<uint64_t, MAX_SUBTARGET_WORDS> &B)
+      : FeatureBitset(B) {}
+
+  const FeatureBitset &getAsBitset() const { return *this; }
+};
+
+//===----------------------------------------------------------------------===//
+
+/// Manages the enabling and disabling of subtarget specific features.
+///
+/// Features are encoded as a string of the form
+///   "+attr1,+attr2,-attr3,...,+attrN"
+/// A comma separates each feature from the next (all lowercase.)
+/// Each of the remaining features is prefixed with + or - indicating whether
+/// that feature should be enabled or disabled contrary to the cpu
+/// specification.
+class SubtargetFeatures {
+  std::vector<std::string> Features;    ///< Subtarget features as a vector
+
+public:
+  explicit SubtargetFeatures(StringRef Initial = "");
+
+  /// Returns features as a string.
+  std::string getString() const;
+
+  /// Adds Features.
+  void AddFeature(StringRef String, bool Enable = true);
+
+  /// Returns the vector of individual subtarget features.
+  const std::vector<std::string> &getFeatures() const { return Features; }
+
+  /// Prints feature string.
+  void print(raw_ostream &OS) const;
+
+  // Dumps feature info.
+  void dump() const;
+
+  /// Adds the default features for the specified target triple.
+  void getDefaultSubtargetFeatures(const Triple& Triple);
+
+  /// Determine if a feature has a flag; '+' or '-'
+  static bool hasFlag(StringRef Feature) {
+    assert(!Feature.empty() && "Empty string");
+    // Get first character
+    char Ch = Feature[0];
+    // Check if first character is '+' or '-' flag
+    return Ch == '+' || Ch =='-';
+  }
+
+  /// Return string stripped of flag.
+  static std::string StripFlag(StringRef Feature) {
+    return hasFlag(Feature) ? Feature.substr(1) : Feature;
+  }
+
+  /// Return true if enable flag; '+'.
+  static inline bool isEnabled(StringRef Feature) {
+    assert(!Feature.empty() && "Empty string");
+    // Get first character
+    char Ch = Feature[0];
+    // Check if first character is '+' for enabled
+    return Ch == '+';
+  }
+
+  /// Splits a string of comma separated items in to a vector of strings.
+  static void Split(std::vector<std::string> &V, StringRef S);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_MC_SUBTARGETFEATURE_H