1 files changed, 72 insertions, 0 deletions
diff --git a/contrib/llvm/utils/TableGen/SubtargetFeatureInfo.h b/contrib/llvm/utils/TableGen/SubtargetFeatureInfo.h
new file mode 100644
index 000000000000..99f380f2a1d7
--- /dev/null
+++ b/contrib/llvm/utils/TableGen/SubtargetFeatureInfo.h
@@ -0,0 +1,72 @@
+//===- SubtargetFeatureInfo.h - Helpers for subtarget features ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_UTIL_TABLEGEN_SUBTARGETFEATUREINFO_H
+#define LLVM_UTIL_TABLEGEN_SUBTARGETFEATUREINFO_H
+
+#include "llvm/TableGen/Error.h"
+#include "llvm/TableGen/Record.h"
+
+#include <map>
+#include <string>
+#include <vector>
+
+namespace llvm {
+class Record;
+class RecordKeeper;
+
+/// Helper class for storing information on a subtarget feature which
+/// participates in instruction matching.
+struct SubtargetFeatureInfo {
+  /// \brief The predicate record for this feature.
+  Record *TheDef;
+
+  /// \brief An unique index assigned to represent this feature.
+  uint64_t Index;
+
+  SubtargetFeatureInfo(Record *D, uint64_t Idx) : TheDef(D), Index(Idx) {}
+
+  /// \brief The name of the enumerated constant identifying this feature.
+  std::string getEnumName() const {
+    return "Feature_" + TheDef->getName().str();
+  }
+
+  void dump() const;
+  static std::vector<std::pair<Record *, SubtargetFeatureInfo>>
+  getAll(const RecordKeeper &Records);
+
+  /// Emit the subtarget feature flag definitions.
+  static void emitSubtargetFeatureFlagEnumeration(
+      std::map<Record *, SubtargetFeatureInfo, LessRecordByID>
+          &SubtargetFeatures,
+      raw_ostream &OS);
+
+  static void emitNameTable(std::map<Record *, SubtargetFeatureInfo,
+                                     LessRecordByID> &SubtargetFeatures,
+                            raw_ostream &OS);
+
+  /// Emit the function to compute the list of available features given a
+  /// subtarget.
+  ///
+  /// \param TargetName The name of the target as used in class prefixes (e.g.
+  ///                   <TargetName>Subtarget)
+  /// \param ClassName  The name of the class (without the <Target> prefix)
+  ///                   that will contain the generated functions.
+  /// \param FuncName   The name of the function to emit.
+  /// \param SubtargetFeatures A map of TableGen records to the
+  ///                          SubtargetFeatureInfo equivalent.
+  static void emitComputeAvailableFeatures(
+      StringRef TargetName, StringRef ClassName, StringRef FuncName,
+      std::map<Record *, SubtargetFeatureInfo, LessRecordByID>
+          &SubtargetFeatures,
+      raw_ostream &OS);
+};
+} // end namespace llvm
+
+#endif // LLVM_UTIL_TABLEGEN_SUBTARGETFEATUREINFO_H