#define DEBUG_TYPE "simplifycfg"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils/Local.h"
-#include "llvm/Constants.h"
-#include "llvm/Instructions.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/Module.h"
-#include "llvm/Attributes.h"
-#include "llvm/Support/CFG.h"
-#include "llvm/Pass.h"
-#include "llvm/DataLayout.h"
-#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
-#include "llvm/TargetTransformInfo.h"
+#include "llvm/Analysis/TargetTransformInfo.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Module.h"
+#include "llvm/Pass.h"
+#include "llvm/Support/CFG.h"
+#include "llvm/Transforms/Utils/Local.h"
using namespace llvm;
STATISTIC(NumSimpl, "Number of blocks simplified");
SmallVector<BasicBlock*, 128> Worklist;
Worklist.push_back(BB);
+ Reachable.insert(BB);
bool Changed = false;
do {
BB = Worklist.pop_back_val();
- if (!Reachable.insert(BB))
- continue;
-
// Do a quick scan of the basic block, turning any obviously unreachable
// instructions into LLVM unreachable insts. The instruction combining pass
// canonicalizes unreachable insts into stores to null or undef.
Changed |= ConstantFoldTerminator(BB, true);
for (succ_iterator SI = succ_begin(BB), SE = succ_end(BB); SI != SE; ++SI)
- Worklist.push_back(*SI);
+ if (Reachable.insert(*SI))
+ Worklist.push_back(*SI);
} while (!Worklist.empty());
return Changed;
}