MachObjectWriter: optimize the string table for common suffices

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

diff --git a/include/llvm/MC/MCSubtargetInfo.h b/include/llvm/MC/MCSubtargetInfo.h
index 451f435fe399199bac4099c749f7d1ed3c972778..9d09bd8ed403258cd75df84c1cc495c37ae2cedc 100644 (file)
--- a/include/llvm/MC/MCSubtargetInfo.h
+++ b/include/llvm/MC/MCSubtargetInfo.h
@@ -11,11 +11,11 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_MC_MCSUBTARGET_H
-#define LLVM_MC_MCSUBTARGET_H
+#ifndef LLVM_MC_MCSUBTARGETINFO_H
+#define LLVM_MC_MCSUBTARGETINFO_H
 
-#include "llvm/MC/SubtargetFeature.h"
 #include "llvm/MC/MCInstrItineraries.h"
+#include "llvm/MC/SubtargetFeature.h"
 #include <string>
 
 namespace llvm {
@@ -28,34 +28,31 @@ class StringRef;
 ///
 class MCSubtargetInfo {
   std::string TargetTriple;            // Target triple
-  const SubtargetFeatureKV *ProcFeatures;  // Processor feature list
-  const SubtargetFeatureKV *ProcDesc;  // Processor descriptions
+  ArrayRef<SubtargetFeatureKV> ProcFeatures;  // Processor feature list
+  ArrayRef<SubtargetFeatureKV> ProcDesc;  // Processor descriptions
 
   // Scheduler machine model
   const SubtargetInfoKV *ProcSchedModels;
   const MCWriteProcResEntry *WriteProcResTable;
   const MCWriteLatencyEntry *WriteLatencyTable;
   const MCReadAdvanceEntry *ReadAdvanceTable;
-  const MCSchedModel *CPUSchedModel;
+  MCSchedModel CPUSchedModel;
 
   const InstrStage *Stages;            // Instruction itinerary stages
   const unsigned *OperandCycles;       // Itinerary operand cycles
   const unsigned *ForwardingPaths;     // Forwarding paths
-  unsigned NumFeatures;                // Number of processor features
-  unsigned NumProcs;                   // Number of processors
   uint64_t FeatureBits;                // Feature bits for current CPU + FS
 
 public:
   void InitMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS,
-                           const SubtargetFeatureKV *PF,
-                           const SubtargetFeatureKV *PD,
+                           ArrayRef<SubtargetFeatureKV> PF,
+                           ArrayRef<SubtargetFeatureKV> PD,
                            const SubtargetInfoKV *ProcSched,
                            const MCWriteProcResEntry *WPR,
                            const MCWriteLatencyEntry *WL,
                            const MCReadAdvanceEntry *RA,
                            const InstrStage *IS,
-                           const unsigned *OC, const unsigned *FP,
-                           unsigned NF, unsigned NP);
+                           const unsigned *OC, const unsigned *FP);
 
   /// getTargetTriple - Return the target triple string.
   StringRef getTargetTriple() const {
@@ -68,10 +65,17 @@ public:
     return FeatureBits;
   }
 
+  /// setFeatureBits - Set the feature bits.
+  ///
+  void setFeatureBits(uint64_t FeatureBits_) { FeatureBits = FeatureBits_; }
+
   /// InitMCProcessorInfo - Set or change the CPU (optionally supplemented with
   /// feature string). Recompute feature bits and scheduling model.
   void InitMCProcessorInfo(StringRef CPU, StringRef FS);
 
+  /// InitCPUSchedModel - Recompute scheduling model based on CPU.
+  void InitCPUSchedModel(StringRef CPU);
+
   /// ToggleFeature - Toggle a feature and returns the re-computed feature
   /// bits. This version does not change the implied bits.
   uint64_t ToggleFeature(uint64_t FB);
@@ -82,11 +86,11 @@ public:
 
   /// getSchedModelForCPU - Get the machine model of a CPU.
   ///
-  const MCSchedModel *getSchedModelForCPU(StringRef CPU) const;
+  MCSchedModel getSchedModelForCPU(StringRef CPU) const;
 
   /// getSchedModel - Get the machine model for this subtarget's CPU.
   ///
-  const MCSchedModel *getSchedModel() const { return CPUSchedModel; }
+  const MCSchedModel &getSchedModel() const { return CPUSchedModel; }
 
   /// Return an iterator at the first process resource consumed by the given
   /// scheduling class.
@@ -109,6 +113,9 @@ public:
 
   int getReadAdvanceCycles(const MCSchedClassDesc *SC, unsigned UseIdx,
                            unsigned WriteResID) const {
+    // TODO: The number of read advance entries in a class can be significant
+    // (~50). Consider compressing the WriteID into a dense ID of those that are
+    // used by ReadAdvance and representing them as a bitset.
     for (const MCReadAdvanceEntry *I = &ReadAdvanceTable[SC->ReadAdvanceIdx],
            *E = I + SC->NumReadAdvanceEntries; I != E; ++I) {
       if (I->UseIdx < UseIdx)