Subzero: Add rudimentary statistics on generated code.

src/IceGlobalContext.h

 //===- subzero/src/IceGlobalContext.h - Global context defs -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares aspects of the compilation that persist across
@@ skipping 10 matching lines @@
 
 #include "IceDefs.h"
 #include "IceIntrinsics.h"
 #include "IceRNG.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class ClFlags;
 
+// This class collects rudimentary statistics during translation.
+class CodeStats {
+public:
+  CodeStats()
+      : InstructionsEmitted(0), RegistersSaved(0), FrameBytes(0), Spills(0),
+        Fills(0), SpillsPlusFills(0) {}
+  void reset() { *this = CodeStats(); }
+  void updateEmitted(uint32_t InstCount) { InstructionsEmitted += InstCount; }
+  void updateRegistersSaved(uint32_t Num) { RegistersSaved += Num; }
+  void updateFrameBytes(uint32_t Bytes) { FrameBytes += Bytes; }
+  void updateSpills() {
+    ++Spills;
+    ++SpillsPlusFills;
+  }
+  void updateFills() {
+    ++Fills;
+    ++SpillsPlusFills;
+  }
+  void dump(const IceString &Name, Ostream &Str) {
+    Str << "|" << Name << "|Inst Count  |" << InstructionsEmitted << "\n";
+    Str << "|" << Name << "|Regs Saved  |" << RegistersSaved << "\n";
+    Str << "|" << Name << "|Frame Bytes |" << FrameBytes << "\n";
+    Str << "|" << Name << "|Spills      |" << Spills << "\n";
+    Str << "|" << Name << "|Fills       |" << Fills << "\n";
+    Str << "|" << Name << "|Spills+Fills|" << SpillsPlusFills << "\n";

[jvoung (off chromium), 2014/09/17 01:21:12]

nit: Seems like this could have been Spills + Fills w/out an extra field to
track the total?

[Jim Stichnoth, 2014/09/17 02:57:06]

True!  Done.

+  }
+
+private:
+  uint32_t InstructionsEmitted;
+  uint32_t RegistersSaved;
+  uint32_t FrameBytes;
+  uint32_t Spills;
+  uint32_t Fills;
+  uint32_t SpillsPlusFills;
+};
+
 // TODO: Accesses to all non-const fields of GlobalContext need to
 // be synchronized, especially the constant pool, the allocator, and
 // the output streams.
 class GlobalContext {
 public:
   GlobalContext(llvm::raw_ostream *OsDump, llvm::raw_ostream *OsEmit,
                 VerboseMask Mask, TargetArch Arch, OptLevel Opt,
                 IceString TestPrefix, const ClFlags &Flags);
   ~GlobalContext();
 
@@ skipping 52 matching lines @@
 
   // Allocate data of type T using the global allocator.
   template <typename T> T *allocate() { return Allocator.Allocate<T>(); }
 
   const Intrinsics &getIntrinsicsInfo() const { return IntrinsicsInfo; }
 
   // TODO(wala,stichnot): Make the RNG play nicely with multithreaded
   // translation.
   RandomNumberGenerator &getRNG() { return RNG; }
 
+  // Reset stats at the beginning of a function.
+  void resetStats() { StatsFunction.reset(); }
+  void dumpStats(const IceString &Name);
+  void statsUpdateEmitted(uint32_t InstCount) {
+    StatsFunction.updateEmitted(InstCount);
+    StatsCumulative.updateEmitted(InstCount);
+  }
+  void statsUpdateRegistersSaved(uint32_t Num) {
+    StatsFunction.updateRegistersSaved(Num);
+    StatsCumulative.updateRegistersSaved(Num);
+  }
+  void statsUpdateFrameBytes(uint32_t Bytes) {
+    StatsFunction.updateFrameBytes(Bytes);
+    StatsCumulative.updateFrameBytes(Bytes);
+  }
+  void statsUpdateSpills() {
+    StatsFunction.updateSpills();
+    StatsCumulative.updateSpills();
+  }
+  void statsUpdateFills() {
+    StatsFunction.updateFills();
+    StatsCumulative.updateFills();
+  }
+
 private:
   Ostream *StrDump; // Stream for dumping / diagnostics
   Ostream *StrEmit; // Stream for code emission
 
   llvm::BumpPtrAllocator Allocator;
   VerboseMask VMask;
   llvm::OwningPtr<class ConstantPool> ConstPool;
   Intrinsics IntrinsicsInfo;
   const TargetArch Arch;
   const OptLevel Opt;
   const IceString TestPrefix;
   const ClFlags &Flags;
   bool HasEmittedFirstMethod;
   RandomNumberGenerator RNG;
+  CodeStats StatsFunction;
+  CodeStats StatsCumulative;
   GlobalContext(const GlobalContext &) LLVM_DELETED_FUNCTION;
   GlobalContext &operator=(const GlobalContext &) LLVM_DELETED_FUNCTION;
 
   // Private helpers for mangleName()
   typedef llvm::SmallVector<char, 32> ManglerVector;
   void incrementSubstitutions(ManglerVector &OldName) const;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEGLOBALCONTEXT_H