1 //===---- AlignmentFromAssumptions.h ----------------------------*- C++ -*-===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements a ScalarEvolution-based transformation to set
11 // the alignments of load, stores and memory intrinsics based on the truth
12 // expressions of assume intrinsics. The primary motivation is to handle
13 // complex alignment assumptions that apply to vector loads and stores that
14 // appear after vectorization and unrolling.
15 //
16 //===----------------------------------------------------------------------===//
17 
18 #ifndef LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
19 #define LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
20 
21 #include "llvm/Analysis/ScalarEvolution.h"
22 #include "llvm/IR/Function.h"
23 #include "llvm/IR/IntrinsicInst.h"
24 #include "llvm/IR/PassManager.h"
25 
26 namespace llvm {
27 
28 struct AlignmentFromAssumptionsPass
29     : public PassInfoMixin<AlignmentFromAssumptionsPass> {
30   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
31 
32   // Glue for old PM.
33   bool runImpl(Function &F, AssumptionCache &AC, ScalarEvolution *SE_,
34                DominatorTree *DT_);
35 
36   ScalarEvolution *SE = nullptr;
37   DominatorTree *DT = nullptr;
38 
39   bool extractAlignmentInfo(CallInst *I, Value *&AAPtr, const SCEV *&AlignSCEV,
40                             const SCEV *&OffSCEV);
41   bool processAssumption(CallInst *I);
42 };
43 }
44 
45 #endif // LLVM_TRANSFORMS_SCALAR_ALIGNMENTFROMASSUMPTIONS_H
46