1 files changed, 76 insertions, 0 deletions
diff --git a/lib/Analysis/InstCount.cpp b/lib/Analysis/InstCount.cpp
new file mode 100644
index 0000000000..831cead4ce
--- /dev/null
+++ b/lib/Analysis/InstCount.cpp
@@ -0,0 +1,76 @@
+//===-- InstCount.cpp - Collects the count of all instructions ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This pass collects the count of all instructions and reports them
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/Passes.h"
+#include "llvm/Pass.h"
+#include "llvm/Function.h"
+#include "llvm/Support/InstVisitor.h"
+#include "llvm/ADT/Statistic.h"
+using namespace llvm;
+
+namespace {
+  Statistic<> TotalInsts ("instcount", "Number of instructions (of all types)");
+  Statistic<> TotalBlocks("instcount", "Number of basic blocks");
+  Statistic<> TotalFuncs ("instcount", "Number of non-external functions");
+  Statistic<> TotalMemInst("instcount", "Number of memory instructions");
+
+#define HANDLE_INST(N, OPCODE, CLASS) \
+    Statistic<> Num##OPCODE##Inst("instcount", "Number of " #OPCODE " insts");
+
+#include "llvm/Instruction.def"
+
+  class InstCount : public FunctionPass, public InstVisitor<InstCount> {
+    friend class InstVisitor<InstCount>;
+
+    void visitFunction  (Function &F) { ++TotalFuncs; }
+    void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
+
+#define HANDLE_INST(N, OPCODE, CLASS) \
+    void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
+
+#include "llvm/Instruction.def"
+
+    void visitInstruction(Instruction &I) {
+      std::cerr << "Instruction Count does not know about " << I;
+      abort();
+    }
+  public:
+    virtual bool runOnFunction(Function &F);
+
+    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+      AU.setPreservesAll();
+    }
+    virtual void print(std::ostream &O, const Module *M) const {}
+
+  };
+
+  RegisterAnalysis<InstCount> X("instcount",
+                                "Counts the various types of Instructions");
+}
+
+FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
+
+// InstCount::run - This is the main Analysis entry point for a
+// function.
+//
+bool InstCount::runOnFunction(Function &F) {
+  unsigned StartMemInsts =
+    NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
+    NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
+  visit(F);
+  unsigned EndMemInsts =
+    NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
+    NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
+  TotalMemInst += EndMemInsts-StartMemInsts;
+  return false;
+}