instcombine: Migrate fwrite optimizations

[oota-llvm.git] / lib / Transforms / Utils / Mem2Reg.cpp

diff --git a/lib/Transforms/Utils/Mem2Reg.cpp b/lib/Transforms/Utils/Mem2Reg.cpp
index e0f79dd36c0959151cea522fa94e505fe18e63fb..f4ca81af6d87d6314ea5f2f41a8c52bff0a8d51c 100644 (file)
--- a/lib/Transforms/Utils/Mem2Reg.cpp
+++ b/lib/Transforms/Utils/Mem2Reg.cpp
@@ -2,8 +2,8 @@
 //
 //                     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 file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
@@ -12,55 +12,56 @@
 //
 //===----------------------------------------------------------------------===//
 
+#define DEBUG_TYPE "mem2reg"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/PromoteMemToReg.h"
 #include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
 #include "llvm/Analysis/Dominators.h"
 #include "llvm/Instructions.h"
 #include "llvm/Function.h"
-#include "llvm/Target/TargetData.h"
 #include "llvm/ADT/Statistic.h"
-#include "llvm/Support/Compiler.h"
 using namespace llvm;
 
+STATISTIC(NumPromoted, "Number of alloca's promoted");
+
 namespace {
-  Statistic NumPromoted("mem2reg", "Number of alloca's promoted");
+  struct PromotePass : public FunctionPass {
+    static char ID; // Pass identification, replacement for typeid
+    PromotePass() : FunctionPass(ID) {
+      initializePromotePassPass(*PassRegistry::getPassRegistry());
+    }
 
-  struct VISIBILITY_HIDDEN PromotePass : public FunctionPass {
     // runOnFunction - To run this pass, first we calculate the alloca
     // instructions that are safe for promotion, then we promote each one.
     //
     virtual bool runOnFunction(Function &F);
 
-    // getAnalysisUsage - We need dominance frontiers
-    //
     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
       AU.addRequired<DominatorTree>();
-      AU.addRequired<DominanceFrontier>();
-      AU.addRequired<TargetData>();
       AU.setPreservesCFG();
-      // This is a cluster of orthogonal Transforms    
+      // This is a cluster of orthogonal Transforms
       AU.addPreserved<UnifyFunctionExitNodes>();
-      AU.addPreservedID(LowerSelectID);
       AU.addPreservedID(LowerSwitchID);
       AU.addPreservedID(LowerInvokePassID);
-      AU.addPreservedID(LowerAllocationsID);
     }
   };
-
-  RegisterPass<PromotePass> X("mem2reg", "Promote Memory to Register");
 }  // end of anonymous namespace
 
+char PromotePass::ID = 0;
+INITIALIZE_PASS_BEGIN(PromotePass, "mem2reg", "Promote Memory to Register",
+                false, false)
+INITIALIZE_PASS_DEPENDENCY(DominatorTree)
+INITIALIZE_PASS_END(PromotePass, "mem2reg", "Promote Memory to Register",
+                false, false)
+
 bool PromotePass::runOnFunction(Function &F) {
   std::vector<AllocaInst*> Allocas;
-  const TargetData &TD = getAnalysis<TargetData>();
 
   BasicBlock &BB = F.getEntryBlock();  // Get the entry node for the function
 
   bool Changed  = false;
 
-  DominatorTree     &DT = getAnalysis<DominatorTree>();
-  DominanceFrontier &DF = getAnalysis<DominanceFrontier>();
+  DominatorTree &DT = getAnalysis<DominatorTree>();
 
   while (1) {
     Allocas.clear();
@@ -69,12 +70,12 @@ bool PromotePass::runOnFunction(Function &F) {
     // the entry node
     for (BasicBlock::iterator I = BB.begin(), E = --BB.end(); I != E; ++I)
       if (AllocaInst *AI = dyn_cast<AllocaInst>(I))       // Is it an alloca?
-        if (isAllocaPromotable(AI, TD))
+        if (isAllocaPromotable(AI))
           Allocas.push_back(AI);
 
     if (Allocas.empty()) break;
 
-    PromoteMemToReg(Allocas, DT, DF, TD);
+    PromoteMemToReg(Allocas, DT);
     NumPromoted += Allocas.size();
     Changed = true;
   }
@@ -82,8 +83,6 @@ bool PromotePass::runOnFunction(Function &F) {
   return Changed;
 }
 
-// Publically exposed interface to pass...
-const PassInfo *llvm::PromoteMemoryToRegisterID = X.getPassInfo();
 // createPromoteMemoryToRegister - Provide an entry point to create this pass.
 //
 FunctionPass *llvm::createPromoteMemoryToRegisterPass() {