//===-- llvm/MC/SubtargetFeature.h - CPU characteristics --------*- C++ -*-===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This 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/ArrayRef.h" #include "llvm/ADT/Triple.h" #include "llvm/Support/DataTypes.h" #include namespace llvm { class raw_ostream; class StringRef; // A container class for subtarget features. // This is convenient because std::bitset does not have a constructor // with an initializer list of set bits. const unsigned MAX_SUBTARGET_FEATURES = 64; class FeatureBitset : public std::bitset { public: // Cannot inherit constructors because it's not supported by VC++.. FeatureBitset() : bitset() {} FeatureBitset(const bitset& B) : bitset(B) {} FeatureBitset(std::initializer_list Init) : bitset() { for (auto I = Init.begin() , E = Init.end(); I != E; ++I) set(*I); } }; //===----------------------------------------------------------------------===// /// /// SubtargetFeatureKV - Used to provide key value pairs for feature and /// CPU bit flags. // struct SubtargetFeatureKV { const char *Key; // K-V key string const char *Desc; // Help descriptor FeatureBitset Value; // K-V integer value FeatureBitset Implies; // K-V bit mask // Compare routine for std::lower_bound bool operator<(StringRef S) const { return StringRef(Key) < S; } }; //===----------------------------------------------------------------------===// /// /// SubtargetInfoKV - Used to provide key value pairs for CPU and arbitrary /// pointers. // struct SubtargetInfoKV { const char *Key; // K-V key string const void *Value; // K-V pointer value // Compare routine for std::lower_bound bool operator<(StringRef S) const { return StringRef(Key) < S; } }; //===----------------------------------------------------------------------===// /// /// SubtargetFeatures - 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 Features; // Subtarget features as a vector public: explicit SubtargetFeatures(StringRef Initial = ""); /// Features string accessors. std::string getString() const; /// Adding Features. void AddFeature(StringRef String, bool Enable = true); /// ToggleFeature - Toggle a feature and returns the newly updated feature /// bits. FeatureBitset ToggleFeature(FeatureBitset Bits, StringRef String, ArrayRef FeatureTable); /// Apply the feature flag and return the newly updated feature bits. FeatureBitset ApplyFeatureFlag(FeatureBitset Bits, StringRef Feature, ArrayRef FeatureTable); /// Get feature bits of a CPU. FeatureBitset getFeatureBits(StringRef CPU, ArrayRef CPUTable, ArrayRef FeatureTable); /// Print feature string. void print(raw_ostream &OS) const; // Dump feature info. void dump() const; /// Adds the default features for the specified target triple. void getDefaultSubtargetFeatures(const Triple& Triple); }; } // End namespace llvm #endif