1 //===---- Canonicalization.cpp - Run canonicalization passes --------------===//
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 // Run the set of default canonicalization passes.
10 //
11 // This pass is mainly used for debugging.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "polly/Canonicalization.h"
16 #include "polly/LinkAllPasses.h"
17 #include "polly/Options.h"
18 #include "llvm/IR/LegacyPassManager.h"
19 #include "llvm/Transforms/IPO.h"
20 #include "llvm/Transforms/InstCombine/InstCombine.h"
21 #include "llvm/Transforms/Scalar.h"
22 #include "llvm/Transforms/Utils.h"
23 
24 using namespace llvm;
25 using namespace polly;
26 
27 static cl::opt<bool>
28     PollyInliner("polly-run-inliner",
29                  cl::desc("Run an early inliner pass before Polly"), cl::Hidden,
30                  cl::init(false), cl::ZeroOrMore, cl::cat(PollyCategory));
31 
32 void polly::registerCanonicalicationPasses(llvm::legacy::PassManagerBase &PM) {
33   bool UseMemSSA = true;
34   PM.add(polly::createRewriteByrefParamsPass());
35   PM.add(llvm::createPromoteMemoryToRegisterPass());
36   PM.add(llvm::createEarlyCSEPass(UseMemSSA));
37   PM.add(llvm::createInstructionCombiningPass());
38   PM.add(llvm::createCFGSimplificationPass());
39   PM.add(llvm::createTailCallEliminationPass());
40   PM.add(llvm::createCFGSimplificationPass());
41   PM.add(llvm::createReassociatePass());
42   PM.add(llvm::createLoopRotatePass());
43   if (PollyInliner) {
44     PM.add(llvm::createFunctionInliningPass(200));
45     PM.add(llvm::createPromoteMemoryToRegisterPass());
46     PM.add(llvm::createCFGSimplificationPass());
47     PM.add(llvm::createInstructionCombiningPass());
48     PM.add(createBarrierNoopPass());
49   }
50   PM.add(llvm::createInstructionCombiningPass());
51   PM.add(llvm::createIndVarSimplifyPass());
52   PM.add(polly::createCodePreparationPass());
53 }
54 
55 namespace {
56 class PollyCanonicalize : public ModulePass {
57   PollyCanonicalize(const PollyCanonicalize &) = delete;
58   const PollyCanonicalize &operator=(const PollyCanonicalize &) = delete;
59 
60 public:
61   static char ID;
62 
63   explicit PollyCanonicalize() : ModulePass(ID) {}
64   ~PollyCanonicalize();
65 
66   /// @name FunctionPass interface.
67   //@{
68   void getAnalysisUsage(AnalysisUsage &AU) const override;
69   void releaseMemory() override;
70   bool runOnModule(Module &M) override;
71   void print(raw_ostream &OS, const Module *) const override;
72   //@}
73 };
74 } // namespace
75 
76 PollyCanonicalize::~PollyCanonicalize() {}
77 
78 void PollyCanonicalize::getAnalysisUsage(AnalysisUsage &AU) const {}
79 
80 void PollyCanonicalize::releaseMemory() {}
81 
82 bool PollyCanonicalize::runOnModule(Module &M) {
83   legacy::PassManager PM;
84   registerCanonicalicationPasses(PM);
85   PM.run(M);
86 
87   return true;
88 }
89 
90 void PollyCanonicalize::print(raw_ostream &OS, const Module *) const {}
91 
92 char PollyCanonicalize::ID = 0;
93 
94 Pass *polly::createPollyCanonicalizePass() { return new PollyCanonicalize(); }
95 
96 INITIALIZE_PASS_BEGIN(PollyCanonicalize, "polly-canonicalize",
97                       "Polly - Run canonicalization passes", false, false)
98 INITIALIZE_PASS_END(PollyCanonicalize, "polly-canonicalize",
99                     "Polly - Run canonicalization passes", false, false)
100