1 files changed, 105 insertions, 0 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineWorklist.h b/lib/Transforms/InstCombine/InstCombineWorklist.h
new file mode 100644
index 0000000..9d88621
--- /dev/null
+++ b/lib/Transforms/InstCombine/InstCombineWorklist.h
@@ -0,0 +1,105 @@
+//===- InstCombineWorklist.h - Worklist for the InstCombine pass ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef INSTCOMBINE_WORKLIST_H
+#define INSTCOMBINE_WORKLIST_H
+
+#define DEBUG_TYPE "instcombine"
+#include "llvm/Instruction.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+  
+/// InstCombineWorklist - This is the worklist management logic for
+/// InstCombine.
+class VISIBILITY_HIDDEN InstCombineWorklist {
+  SmallVector<Instruction*, 256> Worklist;
+  DenseMap<Instruction*, unsigned> WorklistMap;
+  
+  void operator=(const InstCombineWorklist&RHS);   // DO NOT IMPLEMENT
+  InstCombineWorklist(const InstCombineWorklist&); // DO NOT IMPLEMENT
+public:
+  InstCombineWorklist() {}
+  
+  bool isEmpty() const { return Worklist.empty(); }
+  
+  /// Add - Add the specified instruction to the worklist if it isn't already
+  /// in it.
+  void Add(Instruction *I) {
+    if (WorklistMap.insert(std::make_pair(I, Worklist.size())).second) {
+      DEBUG(errs() << "IC: ADD: " << *I << '\n');
+      Worklist.push_back(I);
+    }
+  }
+  
+  void AddValue(Value *V) {
+    if (Instruction *I = dyn_cast<Instruction>(V))
+      Add(I);
+  }
+  
+  /// AddInitialGroup - Add the specified batch of stuff in reverse order.
+  /// which should only be done when the worklist is empty and when the group
+  /// has no duplicates.
+  void AddInitialGroup(Instruction *const *List, unsigned NumEntries) {
+    assert(Worklist.empty() && "Worklist must be empty to add initial group");
+    Worklist.reserve(NumEntries+16);
+    DEBUG(errs() << "IC: ADDING: " << NumEntries << " instrs to worklist\n");
+    for (; NumEntries; --NumEntries) {
+      Instruction *I = List[NumEntries-1];
+      WorklistMap.insert(std::make_pair(I, Worklist.size()));
+      Worklist.push_back(I);
+    }
+  }
+  
+  // Remove - remove I from the worklist if it exists.
+  void Remove(Instruction *I) {
+    DenseMap<Instruction*, unsigned>::iterator It = WorklistMap.find(I);
+    if (It == WorklistMap.end()) return; // Not in worklist.
+    
+    // Don't bother moving everything down, just null out the slot.
+    Worklist[It->second] = 0;
+    
+    WorklistMap.erase(It);
+  }
+  
+  Instruction *RemoveOne() {
+    Instruction *I = Worklist.back();
+    Worklist.pop_back();
+    WorklistMap.erase(I);
+    return I;
+  }
+  
+  /// AddUsersToWorkList - When an instruction is simplified, add all users of
+  /// the instruction to the work lists because they might get more simplified
+  /// now.
+  ///
+  void AddUsersToWorkList(Instruction &I) {
+    for (Value::use_iterator UI = I.use_begin(), UE = I.use_end();
+         UI != UE; ++UI)
+      Add(cast<Instruction>(*UI));
+  }
+  
+  
+  /// Zap - check that the worklist is empty and nuke the backing store for
+  /// the map if it is large.
+  void Zap() {
+    assert(WorklistMap.empty() && "Worklist empty, but map not?");
+    
+    // Do an explicit clear, this shrinks the map if needed.
+    WorklistMap.clear();
+  }
+};
+  
+} // end namespace llvm.
+
+#endif