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36b699f2b1
This requires a number of steps. 1) Move value_use_iterator into the Value class as an implementation detail 2) Change it to actually be a *Use* iterator rather than a *User* iterator. 3) Add an adaptor which is a User iterator that always looks through the Use to the User. 4) Wrap these in Value::use_iterator and Value::user_iterator typedefs. 5) Add the range adaptors as Value::uses() and Value::users(). 6) Update *all* of the callers to correctly distinguish between whether they wanted a use_iterator (and to explicitly dig out the User when needed), or a user_iterator which makes the Use itself totally opaque. Because #6 requires churning essentially everything that walked the Use-Def chains, I went ahead and added all of the range adaptors and switched them to range-based loops where appropriate. Also because the renaming requires at least churning every line of code, it didn't make any sense to split these up into multiple commits -- all of which would touch all of the same lies of code. The result is still not quite optimal. The Value::use_iterator is a nice regular iterator, but Value::user_iterator is an iterator over User*s rather than over the User objects themselves. As a consequence, it fits a bit awkwardly into the range-based world and it has the weird extra-dereferencing 'operator->' that so many of our iterators have. I think this could be fixed by providing something which transforms a range of T&s into a range of T*s, but that *can* be separated into another patch, and it isn't yet 100% clear whether this is the right move. However, this change gets us most of the benefit and cleans up a substantial amount of code around Use and User. =] git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203364 91177308-0d34-0410-b5e6-96231b3b80d8
105 lines
3.2 KiB
C++
105 lines
3.2 KiB
C++
//===- InstCombineWorklist.h - Worklist for InstCombine pass ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef INSTCOMBINE_WORKLIST_H
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#define INSTCOMBINE_WORKLIST_H
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#define DEBUG_TYPE "instcombine"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/IR/Instruction.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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namespace llvm {
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/// InstCombineWorklist - This is the worklist management logic for
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/// InstCombine.
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class LLVM_LIBRARY_VISIBILITY InstCombineWorklist {
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SmallVector<Instruction*, 256> Worklist;
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DenseMap<Instruction*, unsigned> WorklistMap;
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void operator=(const InstCombineWorklist&RHS) LLVM_DELETED_FUNCTION;
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InstCombineWorklist(const InstCombineWorklist&) LLVM_DELETED_FUNCTION;
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public:
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InstCombineWorklist() {}
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bool isEmpty() const { return Worklist.empty(); }
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/// Add - Add the specified instruction to the worklist if it isn't already
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/// in it.
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void Add(Instruction *I) {
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if (WorklistMap.insert(std::make_pair(I, Worklist.size())).second) {
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DEBUG(dbgs() << "IC: ADD: " << *I << '\n');
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Worklist.push_back(I);
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}
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}
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void AddValue(Value *V) {
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if (Instruction *I = dyn_cast<Instruction>(V))
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Add(I);
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}
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/// AddInitialGroup - Add the specified batch of stuff in reverse order.
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/// which should only be done when the worklist is empty and when the group
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/// has no duplicates.
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void AddInitialGroup(Instruction *const *List, unsigned NumEntries) {
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assert(Worklist.empty() && "Worklist must be empty to add initial group");
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Worklist.reserve(NumEntries+16);
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WorklistMap.resize(NumEntries);
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DEBUG(dbgs() << "IC: ADDING: " << NumEntries << " instrs to worklist\n");
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for (unsigned Idx = 0; NumEntries; --NumEntries) {
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Instruction *I = List[NumEntries-1];
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WorklistMap.insert(std::make_pair(I, Idx++));
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Worklist.push_back(I);
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}
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}
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// Remove - remove I from the worklist if it exists.
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void Remove(Instruction *I) {
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DenseMap<Instruction*, unsigned>::iterator It = WorklistMap.find(I);
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if (It == WorklistMap.end()) return; // Not in worklist.
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// Don't bother moving everything down, just null out the slot.
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Worklist[It->second] = 0;
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WorklistMap.erase(It);
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}
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Instruction *RemoveOne() {
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Instruction *I = Worklist.pop_back_val();
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WorklistMap.erase(I);
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return I;
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}
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/// AddUsersToWorkList - When an instruction is simplified, add all users of
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/// the instruction to the work lists because they might get more simplified
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/// now.
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///
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void AddUsersToWorkList(Instruction &I) {
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for (User *U : I.users())
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Add(cast<Instruction>(U));
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}
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/// Zap - check that the worklist is empty and nuke the backing store for
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/// the map if it is large.
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void Zap() {
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assert(WorklistMap.empty() && "Worklist empty, but map not?");
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// Do an explicit clear, this shrinks the map if needed.
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WorklistMap.clear();
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}
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};
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} // end namespace llvm.
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#endif
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