86 lines
2.9 KiB
C++
86 lines
2.9 KiB
C++
//===-- llvm/Transforms/Utils/SimplifyIndVar.h - Indvar Utils ---*- 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 defines in interface for induction variable simplification. It does
|
|
// not define any actual pass or policy, but provides a single function to
|
|
// simplify a loop's induction variables based on ScalarEvolution.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_TRANSFORMS_UTILS_SIMPLIFYINDVAR_H
|
|
#define LLVM_TRANSFORMS_UTILS_SIMPLIFYINDVAR_H
|
|
|
|
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
|
|
#include "llvm/IR/ConstantRange.h"
|
|
#include "llvm/IR/ValueHandle.h"
|
|
|
|
namespace llvm {
|
|
|
|
class CastInst;
|
|
class DominatorTree;
|
|
class Loop;
|
|
class LoopInfo;
|
|
class PHINode;
|
|
class ScalarEvolution;
|
|
class SCEVExpander;
|
|
class TargetTransformInfo;
|
|
|
|
/// Interface for visiting interesting IV users that are recognized but not
|
|
/// simplified by this utility.
|
|
class IVVisitor {
|
|
protected:
|
|
const DominatorTree *DT = nullptr;
|
|
|
|
virtual void anchor();
|
|
|
|
public:
|
|
IVVisitor() = default;
|
|
virtual ~IVVisitor() = default;
|
|
|
|
const DominatorTree *getDomTree() const { return DT; }
|
|
virtual void visitCast(CastInst *Cast) = 0;
|
|
};
|
|
|
|
/// simplifyUsersOfIV - Simplify instructions that use this induction variable
|
|
/// by using ScalarEvolution to analyze the IV's recurrence.
|
|
bool simplifyUsersOfIV(PHINode *CurrIV, ScalarEvolution *SE, DominatorTree *DT,
|
|
LoopInfo *LI, const TargetTransformInfo *TTI,
|
|
SmallVectorImpl<WeakTrackingVH> &Dead,
|
|
SCEVExpander &Rewriter, IVVisitor *V = nullptr);
|
|
|
|
/// SimplifyLoopIVs - Simplify users of induction variables within this
|
|
/// loop. This does not actually change or add IVs.
|
|
bool simplifyLoopIVs(Loop *L, ScalarEvolution *SE, DominatorTree *DT,
|
|
LoopInfo *LI, const TargetTransformInfo *TTI,
|
|
SmallVectorImpl<WeakTrackingVH> &Dead);
|
|
|
|
/// Collect information about induction variables that are used by sign/zero
|
|
/// extend operations. This information is recorded by CollectExtend and provides
|
|
/// the input to WidenIV.
|
|
struct WideIVInfo {
|
|
PHINode *NarrowIV = nullptr;
|
|
|
|
// Widest integer type created [sz]ext
|
|
Type *WidestNativeType = nullptr;
|
|
|
|
// Was a sext user seen before a zext?
|
|
bool IsSigned = false;
|
|
};
|
|
|
|
/// Widen Induction Variables - Extend the width of an IV to cover its
|
|
/// widest uses.
|
|
PHINode *createWideIV(const WideIVInfo &WI,
|
|
LoopInfo *LI, ScalarEvolution *SE, SCEVExpander &Rewriter,
|
|
DominatorTree *DT, SmallVectorImpl<WeakTrackingVH> &DeadInsts,
|
|
unsigned &NumElimExt, unsigned &NumWidened,
|
|
bool HasGuards, bool UsePostIncrementRanges);
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_TRANSFORMS_UTILS_SIMPLIFYINDVAR_H
|