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//===-- 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 <bitset>
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 = 128;
class FeatureBitset : public std::bitset<MAX_SUBTARGET_FEATURES> {
public:
// Cannot inherit constructors because it's not supported by VC++..
FeatureBitset() : bitset() {}
FeatureBitset(const bitset<MAX_SUBTARGET_FEATURES>& B) : bitset(B) {}
FeatureBitset(std::initializer_list<unsigned> 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<std::string> 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<SubtargetFeatureKV> FeatureTable);
/// Apply the feature flag and return the newly updated feature bits.
FeatureBitset ApplyFeatureFlag(FeatureBitset Bits, StringRef Feature,
ArrayRef<SubtargetFeatureKV> FeatureTable);
/// Get feature bits of a CPU.
FeatureBitset getFeatureBits(StringRef CPU,
ArrayRef<SubtargetFeatureKV> CPUTable,
ArrayRef<SubtargetFeatureKV> 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
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