#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 <vector>
+#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 = 64;
+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
struct SubtargetFeatureKV {
const char *Key; // K-V key string
const char *Desc; // Help descriptor
- uint64_t Value; // K-V integer value
- uint64_t Implies; // K-V bit mask
+ FeatureBitset Value; // K-V integer value
+ FeatureBitset Implies; // K-V bit mask
// Compare routine for std::lower_bound
bool operator<(StringRef S) const {
class SubtargetFeatures {
std::vector<std::string> Features; // Subtarget features as a vector
public:
- explicit SubtargetFeatures(const StringRef Initial = "");
+ explicit SubtargetFeatures(StringRef Initial = "");
/// Features string accessors.
std::string getString() const;
/// Adding Features.
- void AddFeature(const StringRef String);
+ void AddFeature(StringRef String, bool Enable = true);
/// ToggleFeature - Toggle a feature and returns the newly updated feature
/// bits.
- uint64_t ToggleFeature(uint64_t Bits, const StringRef String,
- const SubtargetFeatureKV *FeatureTable,
- size_t FeatureTableSize);
+ 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.
- uint64_t getFeatureBits(const StringRef CPU,
- const SubtargetFeatureKV *CPUTable,
- size_t CPUTableSize,
- const SubtargetFeatureKV *FeatureTable,
- size_t FeatureTableSize);
+ FeatureBitset getFeatureBits(StringRef CPU,
+ ArrayRef<SubtargetFeatureKV> CPUTable,
+ ArrayRef<SubtargetFeatureKV> FeatureTable);
/// Print feature string.
void print(raw_ostream &OS) const;