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//===- InstCombineWorklist.h - Worklist for InstCombine pass ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_INSTCOMBINE_INSTCOMBINEWORKLIST_H
#define LLVM_TRANSFORMS_INSTCOMBINE_INSTCOMBINEWORKLIST_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/Instruction.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#define DEBUG_TYPE "instcombine"
namespace llvm {
/// InstCombineWorklist - This is the worklist management logic for
/// InstCombine.
class InstCombineWorklist {
SmallVector<Instruction*, 256> Worklist;
DenseMap<Instruction*, unsigned> WorklistMap;
public:
InstCombineWorklist() = default;
InstCombineWorklist(InstCombineWorklist &&) = default;
InstCombineWorklist &operator=(InstCombineWorklist &&) = default;
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(dbgs() << "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(ArrayRef<Instruction *> List) {
assert(Worklist.empty() && "Worklist must be empty to add initial group");
Worklist.reserve(List.size()+16);
WorklistMap.reserve(List.size());
DEBUG(dbgs() << "IC: ADDING: " << List.size() << " instrs to worklist\n");
unsigned Idx = 0;
for (Instruction *I : reverse(List)) {
WorklistMap.insert(std::make_pair(I, Idx++));
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] = nullptr;
WorklistMap.erase(It);
}
Instruction *RemoveOne() {
Instruction *I = Worklist.pop_back_val();
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 (User *U : I.users())
Add(cast<Instruction>(U));
}
/// 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.
#undef DEBUG_TYPE
#endif
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