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//===---- AlignmentFromAssumptions.h ----------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/Analysis/ScalarEvolution.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/PassManager.h"
namespace llvm {
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_);
// For memory transfers, we need a common alignment for both the source and
// destination. If we have a new alignment for only one operand of a transfer
// instruction, save it in these maps. If we reach the other operand through
// another assumption later, then we may change the alignment at that point.
DenseMap<MemTransferInst *, unsigned> NewDestAlignments, NewSrcAlignments;
ScalarEvolution *SE = nullptr;
DominatorTree *DT = nullptr;
bool extractAlignmentInfo(CallInst *I, Value *&AAPtr, const SCEV *&AlignSCEV,
const SCEV *&OffSCEV);
bool processAssumption(CallInst *I);
};
}
#endif // LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
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