1 //===---- AlignmentFromAssumptions.h ----------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file implements a ScalarEvolution-based transformation to set
10 // the alignments of load, stores and memory intrinsics based on the truth
11 // expressions of assume intrinsics. The primary motivation is to handle
12 // complex alignment assumptions that apply to vector loads and stores that
13 // appear after vectorization and unrolling.
14 //
15 //===----------------------------------------------------------------------===//
16 
17 #ifndef LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
18 #define LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
19 
20 #include "llvm/Analysis/ScalarEvolution.h"
21 #include "llvm/IR/Function.h"
22 #include "llvm/IR/IntrinsicInst.h"
23 #include "llvm/IR/PassManager.h"
24 
25 namespace llvm {
26 
27 struct AlignmentFromAssumptionsPass
28     : public PassInfoMixin<AlignmentFromAssumptionsPass> {
29   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
30 
31   // Glue for old PM.
32   bool runImpl(Function &F, AssumptionCache &AC, ScalarEvolution *SE_,
33                DominatorTree *DT_);
34 
35   ScalarEvolution *SE = nullptr;
36   DominatorTree *DT = nullptr;
37 
38   bool extractAlignmentInfo(CallInst *I, Value *&AAPtr, const SCEV *&AlignSCEV,
39                             const SCEV *&OffSCEV);
40   bool processAssumption(CallInst *I);
41 };
42 }
43 
44 #endif // LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
45