Add missing newlines at EOF (for clang++).

[oota-llvm.git] / lib / Transforms / Scalar / SimplifyCFGPass.cpp

diff --git a/lib/Transforms/Scalar/SimplifyCFGPass.cpp b/lib/Transforms/Scalar/SimplifyCFGPass.cpp
index 29712b3c13de82d9c025f9f30ea08b684f0530e1..e905952c5db76b14c1153c4fcdbcc452b21161ce 100644 (file)
--- a/lib/Transforms/Scalar/SimplifyCFGPass.cpp
+++ b/lib/Transforms/Scalar/SimplifyCFGPass.cpp
@@ -26,7 +26,6 @@
 #include "llvm/Transforms/Utils/Local.h"
 #include "llvm/Constants.h"
 #include "llvm/Instructions.h"
-#include "llvm/LLVMContext.h"
 #include "llvm/Module.h"
 #include "llvm/Attributes.h"
 #include "llvm/Support/CFG.h"
@@ -57,7 +56,7 @@ FunctionPass *llvm::createCFGSimplificationPass() {
 
 /// ChangeToUnreachable - Insert an unreachable instruction before the specified
 /// instruction, making it and the rest of the code in the block dead.
-static void ChangeToUnreachable(Instruction *I, LLVMContext &Context) {
+static void ChangeToUnreachable(Instruction *I) {
   BasicBlock *BB = I->getParent();
   // Loop over all of the successors, removing BB's entry from any PHI
   // nodes.
@@ -95,8 +94,7 @@ static void ChangeToCall(InvokeInst *II) {
 }
 
 static bool MarkAliveBlocks(BasicBlock *BB,
-                            SmallPtrSet<BasicBlock*, 128> &Reachable,
-                            LLVMContext &Context) {
+                            SmallPtrSet<BasicBlock*, 128> &Reachable) {
   
   SmallVector<BasicBlock*, 128> Worklist;
   Worklist.push_back(BB);
@@ -119,20 +117,23 @@ static bool MarkAliveBlocks(BasicBlock *BB,
           // though.
           ++BBI;
           if (!isa<UnreachableInst>(BBI)) {
-            ChangeToUnreachable(BBI, Context);
+            ChangeToUnreachable(BBI);
             Changed = true;
           }
           break;
         }
       }
       
+      // Store to undef and store to null are undefined and used to signal that
+      // they should be changed to unreachable by passes that can't modify the
+      // CFG.
       if (StoreInst *SI = dyn_cast<StoreInst>(BBI)) {
         Value *Ptr = SI->getOperand(1);
         
         if (isa<UndefValue>(Ptr) ||
             (isa<ConstantPointerNull>(Ptr) &&
              SI->getPointerAddressSpace() == 0)) {
-          ChangeToUnreachable(SI, Context);
+          ChangeToUnreachable(SI);
           Changed = true;
           break;
         }
@@ -158,7 +159,7 @@ static bool MarkAliveBlocks(BasicBlock *BB,
 /// otherwise.
 static bool RemoveUnreachableBlocksFromFn(Function &F) {
   SmallPtrSet<BasicBlock*, 128> Reachable;
-  bool Changed = MarkAliveBlocks(F.begin(), Reachable, F.getContext());
+  bool Changed = MarkAliveBlocks(F.begin(), Reachable);
   
   // If there are unreachable blocks in the CFG...
   if (Reachable.size() == F.size())