#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)
+ 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 {
return StringRef(Key) < S;
}
+
+ // Compare routine for std::is_sorted.
+ bool operator<(const SubtargetFeatureKV &Other) const {
+ return StringRef(Key) < StringRef(Other.Key);
+ }
};
//===----------------------------------------------------------------------===//
/// ToggleFeature - Toggle a feature and returns the newly updated feature
/// bits.
- uint64_t ToggleFeature(uint64_t Bits, StringRef String,
+ 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(StringRef CPU,
+ FeatureBitset getFeatureBits(StringRef CPU,
ArrayRef<SubtargetFeatureKV> CPUTable,
ArrayRef<SubtargetFeatureKV> FeatureTable);