1 files changed, 145 insertions, 0 deletions
diff --git a/llvm/include/llvm/Target/SubtargetFeature.h b/llvm/include/llvm/Target/SubtargetFeature.h
new file mode 100644
index 00000000000..43200a27a11
--- /dev/null
+++ b/llvm/include/llvm/Target/SubtargetFeature.h
@@ -0,0 +1,145 @@
+//===-- llvm/Target/SubtargetFeature.h - CPU characteristics ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by Jim Laskey and 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_TARGET_SUBTARGETFEATURE_H
+#define LLVM_TARGET_SUBTARGETFEATURE_H
+
+
+#include <string>
+#include <vector>
+#include <iostream>
+#include <cassert>
+
+namespace llvm {
+
+//===----------------------------------------------------------------------===//
+///
+/// SubtargetFeatureKV - Used to provide key value pairs for feature and
+/// CPU bit flags.
+//
+struct SubtargetFeatureKV {
+  const char *Key;                      // K-V key string
+  uint32_t Value;                       // K-V integer value
+  
+  // Compare routine for std binary search
+  bool operator<(const std::string &S) const {
+    return strcmp(Key, S.c_str()) < 0;
+  }
+};
+  
+//===----------------------------------------------------------------------===//
+///
+/// SubtargetFeatures - Manages the enabling and disabling of subtarget 
+/// specific features.  Features are encoded as a string of the form
+///   "cpu,+attr1,+attr2,-attr3,...,+attrN"
+/// A comma separates each feature from the next (all lowercase.)
+/// The first feature is always the CPU subtype (eg. pentiumm).  If the CPU
+/// value is "generic" then the CPU subtype should be generic for the target.
+/// 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 {
+private:
+  std::vector<std::string> Features;    // Subtarget features as a vector
+
+  // Determine if a feature has a flag; '+' or '-'
+  static inline bool hasFlag(const std::string &Feature) {
+    assert(!Feature.empty() && "Empty string");
+    // Get first character
+    char Ch = Feature[0];
+    // Check if first character is '+' or '-' flag
+    return Ch == '+' || Ch =='-';
+  }
+  
+  // Return true if enable flag; '+'.
+  static inline bool isEnabled(const std::string &Feature) {
+    assert(!Feature.empty() && "Empty string");
+    // Get first character
+    char Ch = Feature[0];
+    // Check if first character is '+' for enabled
+    return Ch == '+';
+  }
+  
+  // Return a string with a prepended flag; '+' or '-'.
+  static inline std::string PrependFlag(const std::string &Feature,
+                                        bool IsEnabled) {
+    assert(!Feature.empty() && "Empty string");
+    if (hasFlag(Feature)) return Feature;
+    return std::string(IsEnabled ? "+" : "-") + Feature;
+  }
+  
+  // Return string stripped of flag.
+  static inline std::string StripFlag(const std::string &Feature) {
+    return hasFlag(Feature) ? Feature.substr(1) : Feature;
+  }
+
+  /// Splits a string of comma separated items in to a vector of strings.
+  static void Split(std::vector<std::string> &V, const std::string &S);
+  
+  /// Join a vector of strings into a string with a comma separating each
+  /// item.
+  static std::string Join(const std::vector<std::string> &V);
+  
+  /// Convert a string to lowercase.
+  static std::string toLower(const std::string &S);
+  
+  /// Find item in array using binary search.
+  static const SubtargetFeatureKV *Find(const std::string &S,
+                                        const SubtargetFeatureKV *A, size_t L);
+
+public:
+  /// Ctor.
+  SubtargetFeatures(const std::string Initial = std::string()) {
+    // Break up string into separate features
+    Split(Features, Initial);
+  }
+
+  /// Features string accessors.
+  inline std::string getString() const { return Join(Features); }
+  void setString(const std::string &Initial) {
+    // Throw out old features
+    Features.clear();
+    // Break up string into separate features
+    Split(Features, toLower(Initial));
+  }
+
+  /// Setting CPU string.  Replaces previous setting.  Setting to "" clears CPU.
+  void setCPU(std::string String) { Features[0] = toLower(String); }
+  
+  /// Adding Features.
+  void AddFeature(const std::string &String, bool IsEnabled = true);
+
+  /// Parse feature string for quick usage.
+  static uint32_t Parse(const std::string &String,
+                        const std::string &DefaultCPU,
+                        const SubtargetFeatureKV *CPUTable,
+                        size_t CPUTableSize,
+                        const SubtargetFeatureKV *FeatureTable,
+                        size_t FeatureTableSize);
+  
+  /// Print feature string.
+  void print(std::ostream &OS) const;
+  
+  // Dump feature info.
+  void dump() const;
+};
+
+} // End namespace llvm
+
+#endif