Bump up MAX_SUBTARGET_FEATURES

[oota-llvm.git] / include / llvm / MC / SubtargetFeature.h

diff --git a/include/llvm/MC/SubtargetFeature.h b/include/llvm/MC/SubtargetFeature.h
index cc56576c74a4b0abb63db3a257cc0a37958c5837..0d97b226d7283210fd10557518f32d88e57dedd0 100644 (file)
--- a/include/llvm/MC/SubtargetFeature.h
+++ b/include/llvm/MC/SubtargetFeature.h
@@ -18,14 +18,32 @@
 #ifndef LLVM_MC_SUBTARGETFEATURE_H
 #define LLVM_MC_SUBTARGETFEATURE_H
 
-#include <string>
-#include <vector>
+#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
@@ -34,15 +52,15 @@ namespace llvm {
 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
-  
-  // Compare routine for std binary search
-  bool operator<(const SubtargetFeatureKV &S) const {
-    return strcmp(Key, S.Key) < 0;
+  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
@@ -50,22 +68,20 @@ struct SubtargetFeatureKV {
 //
 struct SubtargetInfoKV {
   const char *Key;                      // K-V key string
-  void *Value;                          // K-V pointer value
-  
-  // Compare routine for std binary search
-  bool operator<(const SubtargetInfoKV &S) const {
-    return strcmp(Key, S.Key) < 0;
+  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 
+/// SubtargetFeatures - Manages the enabling and disabling of subtarget
 /// specific features.  Features are encoded as a string of the form
-///   "cpu,+attr1,+attr2,-attr3,...,+attrN"
+///   "+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.
@@ -74,43 +90,36 @@ struct SubtargetInfoKV {
 class SubtargetFeatures {
   std::vector<std::string> Features;    // Subtarget features as a vector
 public:
-  explicit SubtargetFeatures(const std::string &Initial = std::string());
+  explicit SubtargetFeatures(StringRef Initial = "");
 
   /// Features string accessors.
   std::string getString() const;
-  void setString(const std::string &Initial);
 
-  /// Set the CPU string.  Replaces previous setting.  Setting to "" clears CPU.
-  void setCPU(const std::string &String);
+  /// Adding Features.
+  void AddFeature(StringRef String, bool Enable = true);
 
-  /// Setting CPU string only if no string is set.
-  void setCPUIfNone(const std::string &String);
+  /// ToggleFeature - Toggle a feature and returns the newly updated feature
+  /// bits.
+  FeatureBitset ToggleFeature(FeatureBitset Bits, StringRef String,
+                         ArrayRef<SubtargetFeatureKV> FeatureTable);
 
-  /// Returns current CPU string.
-  const std::string & getCPU() const;
+  /// 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);
 
-  /// Adding Features.
-  void AddFeature(const std::string &String, bool IsEnabled = true);
-           
-  /// Get feature bits.
-  uint64_t getBits(const SubtargetFeatureKV *CPUTable,
-                         size_t CPUTableSize,
-                   const SubtargetFeatureKV *FeatureTable,
-                         size_t FeatureTableSize);
-                         
-  /// Get info pointer
-  void *getInfo(const SubtargetInfoKV *Table, size_t TableSize);
-  
   /// Print feature string.
   void print(raw_ostream &OS) const;
-  
+
   // Dump feature info.
   void dump() const;
 
-  /// Retrieve a formatted string of the default features for the specified
-  /// target triple.
-  void getDefaultSubtargetFeatures(const std::string &CPU,
-                                   const Triple& Triple);
+  /// Adds the default features for the specified target triple.
+  void getDefaultSubtargetFeatures(const Triple& Triple);
 };
 
 } // End namespace llvm