AlignmentFromAssumptions.h

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//===---- AlignmentFromAssumptions.h ----------------------------*- 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 a ScalarEvolution-based transformation to set
// the alignments of load, stores and memory intrinsics based on the truth
// expressions of assume intrinsics. The primary motivation is to handle
// complex alignment assumptions that apply to vector loads and stores that
// appear after vectorization and unrolling.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
#define LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
 
#include "llvm/IR/PassManager.h"
 
namespace llvm {
 
class AssumptionCache;
class CallInst;
class DominatorTree;
class ScalarEvolution;
class SCEV;
class Value;
 
struct AlignmentFromAssumptionsPass
    : public PassInfoMixin<AlignmentFromAssumptionsPass> {
  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
 
  // Glue for old PM.
  bool runImpl(Function &F, AssumptionCache &AC, ScalarEvolution *SE_,
               DominatorTree *DT_);
 
  ScalarEvolution *SE = nullptr;
  DominatorTree *DT = nullptr;
 
  bool extractAlignmentInfo(CallInst *I, unsigned Idx, Value *&AAPtr,
                            const SCEV *&AlignSCEV, const SCEV *&OffSCEV);
  bool processAssumption(CallInst *I, unsigned Idx);
};
}
 
#endif // LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H