1 files changed, 201 insertions, 0 deletions
diff --git a/clang-r353983/include/llvm/Analysis/IVUsers.h b/clang-r353983/include/llvm/Analysis/IVUsers.h
new file mode 100644
index 00000000..f8ea3bcc
--- /dev/null
+++ b/clang-r353983/include/llvm/Analysis/IVUsers.h
@@ -0,0 +1,201 @@
+//===- llvm/Analysis/IVUsers.h - Induction Variable Users -------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements bookkeeping for "interesting" users of expressions
+// computed from induction variables.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_ANALYSIS_IVUSERS_H
+#define LLVM_ANALYSIS_IVUSERS_H
+
+#include "llvm/Analysis/LoopAnalysisManager.h"
+#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Analysis/ScalarEvolutionNormalization.h"
+#include "llvm/IR/ValueHandle.h"
+
+namespace llvm {
+
+class AssumptionCache;
+class DominatorTree;
+class Instruction;
+class Value;
+class ScalarEvolution;
+class SCEV;
+class IVUsers;
+class DataLayout;
+
+/// IVStrideUse - Keep track of one use of a strided induction variable.
+/// The Expr member keeps track of the expression, User is the actual user
+/// instruction of the operand, and 'OperandValToReplace' is the operand of
+/// the User that is the use.
+class IVStrideUse final : public CallbackVH, public ilist_node<IVStrideUse> {
+  friend class IVUsers;
+public:
+  IVStrideUse(IVUsers *P, Instruction* U, Value *O)
+    : CallbackVH(U), Parent(P), OperandValToReplace(O) {
+  }
+
+  /// getUser - Return the user instruction for this use.
+  Instruction *getUser() const {
+    return cast<Instruction>(getValPtr());
+  }
+
+  /// setUser - Assign a new user instruction for this use.
+  void setUser(Instruction *NewUser) {
+    setValPtr(NewUser);
+  }
+
+  /// getOperandValToReplace - Return the Value of the operand in the user
+  /// instruction that this IVStrideUse is representing.
+  Value *getOperandValToReplace() const {
+    return OperandValToReplace;
+  }
+
+  /// setOperandValToReplace - Assign a new Value as the operand value
+  /// to replace.
+  void setOperandValToReplace(Value *Op) {
+    OperandValToReplace = Op;
+  }
+
+  /// getPostIncLoops - Return the set of loops for which the expression has
+  /// been adjusted to use post-inc mode.
+  const PostIncLoopSet &getPostIncLoops() const {
+    return PostIncLoops;
+  }
+
+  /// transformToPostInc - Transform the expression to post-inc form for the
+  /// given loop.
+  void transformToPostInc(const Loop *L);
+
+private:
+  /// Parent - a pointer to the IVUsers that owns this IVStrideUse.
+  IVUsers *Parent;
+
+  /// OperandValToReplace - The Value of the operand in the user instruction
+  /// that this IVStrideUse is representing.
+  WeakTrackingVH OperandValToReplace;
+
+  /// PostIncLoops - The set of loops for which Expr has been adjusted to
+  /// use post-inc mode. This corresponds with SCEVExpander's post-inc concept.
+  PostIncLoopSet PostIncLoops;
+
+  /// Deleted - Implementation of CallbackVH virtual function to
+  /// receive notification when the User is deleted.
+  void deleted() override;
+};
+
+class IVUsers {
+  friend class IVStrideUse;
+  Loop *L;
+  AssumptionCache *AC;
+  LoopInfo *LI;
+  DominatorTree *DT;
+  ScalarEvolution *SE;
+  SmallPtrSet<Instruction*, 16> Processed;
+
+  /// IVUses - A list of all tracked IV uses of induction variable expressions
+  /// we are interested in.
+  ilist<IVStrideUse> IVUses;
+
+  // Ephemeral values used by @llvm.assume in this function.
+  SmallPtrSet<const Value *, 32> EphValues;
+
+public:
+  IVUsers(Loop *L, AssumptionCache *AC, LoopInfo *LI, DominatorTree *DT,
+          ScalarEvolution *SE);
+
+  IVUsers(IVUsers &&X)
+      : L(std::move(X.L)), AC(std::move(X.AC)), DT(std::move(X.DT)),
+        SE(std::move(X.SE)), Processed(std::move(X.Processed)),
+        IVUses(std::move(X.IVUses)), EphValues(std::move(X.EphValues)) {
+    for (IVStrideUse &U : IVUses)
+      U.Parent = this;
+  }
+  IVUsers(const IVUsers &) = delete;
+  IVUsers &operator=(IVUsers &&) = delete;
+  IVUsers &operator=(const IVUsers &) = delete;
+
+  Loop *getLoop() const { return L; }
+
+  /// AddUsersIfInteresting - Inspect the specified Instruction.  If it is a
+  /// reducible SCEV, recursively add its users to the IVUsesByStride set and
+  /// return true.  Otherwise, return false.
+  bool AddUsersIfInteresting(Instruction *I);
+
+  IVStrideUse &AddUser(Instruction *User, Value *Operand);
+
+  /// getReplacementExpr - Return a SCEV expression which computes the
+  /// value of the OperandValToReplace of the given IVStrideUse.
+  const SCEV *getReplacementExpr(const IVStrideUse &IU) const;
+
+  /// getExpr - Return the expression for the use.
+  const SCEV *getExpr(const IVStrideUse &IU) const;
+
+  const SCEV *getStride(const IVStrideUse &IU, const Loop *L) const;
+
+  typedef ilist<IVStrideUse>::iterator iterator;
+  typedef ilist<IVStrideUse>::const_iterator const_iterator;
+  iterator begin() { return IVUses.begin(); }
+  iterator end()   { return IVUses.end(); }
+  const_iterator begin() const { return IVUses.begin(); }
+  const_iterator end() const   { return IVUses.end(); }
+  bool empty() const { return IVUses.empty(); }
+
+  bool isIVUserOrOperand(Instruction *Inst) const {
+    return Processed.count(Inst);
+  }
+
+  void releaseMemory();
+
+  void print(raw_ostream &OS, const Module * = nullptr) const;
+
+  /// dump - This method is used for debugging.
+  void dump() const;
+
+protected:
+  bool AddUsersImpl(Instruction *I, SmallPtrSetImpl<Loop*> &SimpleLoopNests);
+};
+
+Pass *createIVUsersPass();
+
+class IVUsersWrapperPass : public LoopPass {
+  std::unique_ptr<IVUsers> IU;
+
+public:
+  static char ID;
+
+  IVUsersWrapperPass();
+
+  IVUsers &getIU() { return *IU; }
+  const IVUsers &getIU() const { return *IU; }
+
+  void getAnalysisUsage(AnalysisUsage &AU) const override;
+
+  bool runOnLoop(Loop *L, LPPassManager &LPM) override;
+
+  void releaseMemory() override;
+
+  void print(raw_ostream &OS, const Module * = nullptr) const override;
+};
+
+/// Analysis pass that exposes the \c IVUsers for a loop.
+class IVUsersAnalysis : public AnalysisInfoMixin<IVUsersAnalysis> {
+  friend AnalysisInfoMixin<IVUsersAnalysis>;
+  static AnalysisKey Key;
+
+public:
+  typedef IVUsers Result;
+
+  IVUsers run(Loop &L, LoopAnalysisManager &AM,
+              LoopStandardAnalysisResults &AR);
+};
+
+}
+
+#endif