1 //===-- LanaiTargetMachine.cpp - Define TargetMachine for Lanai ---------===//
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 // Implements the info about Lanai target spec.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "LanaiTargetMachine.h"
14 
15 #include "Lanai.h"
16 #include "LanaiMachineFunctionInfo.h"
17 #include "LanaiTargetObjectFile.h"
18 #include "LanaiTargetTransformInfo.h"
19 #include "TargetInfo/LanaiTargetInfo.h"
20 #include "llvm/Analysis/TargetTransformInfo.h"
21 #include "llvm/CodeGen/Passes.h"
22 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
23 #include "llvm/CodeGen/TargetPassConfig.h"
24 #include "llvm/MC/TargetRegistry.h"
25 #include "llvm/Support/FormattedStream.h"
26 #include "llvm/Target/TargetOptions.h"
27 #include <optional>
28 
29 using namespace llvm;
30 
31 namespace llvm {
32 void initializeLanaiMemAluCombinerPass(PassRegistry &);
33 } // namespace llvm
34 
35 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeLanaiTarget() {
36   // Register the target.
37   RegisterTargetMachine<LanaiTargetMachine> registered_target(
38       getTheLanaiTarget());
39   PassRegistry &PR = *PassRegistry::getPassRegistry();
40   initializeLanaiDAGToDAGISelPass(PR);
41 }
42 
43 static std::string computeDataLayout() {
44   // Data layout (keep in sync with clang/lib/Basic/Targets.cpp)
45   return "E"        // Big endian
46          "-m:e"     // ELF name manging
47          "-p:32:32" // 32-bit pointers, 32 bit aligned
48          "-i64:64"  // 64 bit integers, 64 bit aligned
49          "-a:0:32"  // 32 bit alignment of objects of aggregate type
50          "-n32"     // 32 bit native integer width
51          "-S64";    // 64 bit natural stack alignment
52 }
53 
54 static Reloc::Model getEffectiveRelocModel(std::optional<Reloc::Model> RM) {
55   return RM.value_or(Reloc::PIC_);
56 }
57 
58 LanaiTargetMachine::LanaiTargetMachine(
59     const Target &T, const Triple &TT, StringRef Cpu, StringRef FeatureString,
60     const TargetOptions &Options, std::optional<Reloc::Model> RM,
61     std::optional<CodeModel::Model> CodeModel, CodeGenOpt::Level OptLevel,
62     bool JIT)
63     : LLVMTargetMachine(T, computeDataLayout(), TT, Cpu, FeatureString, Options,
64                         getEffectiveRelocModel(RM),
65                         getEffectiveCodeModel(CodeModel, CodeModel::Medium),
66                         OptLevel),
67       Subtarget(TT, Cpu, FeatureString, *this, Options, getCodeModel(),
68                 OptLevel),
69       TLOF(new LanaiTargetObjectFile()) {
70   initAsmInfo();
71 }
72 
73 TargetTransformInfo
74 LanaiTargetMachine::getTargetTransformInfo(const Function &F) const {
75   return TargetTransformInfo(LanaiTTIImpl(this, F));
76 }
77 
78 MachineFunctionInfo *LanaiTargetMachine::createMachineFunctionInfo(
79     BumpPtrAllocator &Allocator, const Function &F,
80     const TargetSubtargetInfo *STI) const {
81   return LanaiMachineFunctionInfo::create<LanaiMachineFunctionInfo>(Allocator,
82                                                                     F, STI);
83 }
84 
85 namespace {
86 // Lanai Code Generator Pass Configuration Options.
87 class LanaiPassConfig : public TargetPassConfig {
88 public:
89   LanaiPassConfig(LanaiTargetMachine &TM, PassManagerBase *PassManager)
90       : TargetPassConfig(TM, *PassManager) {}
91 
92   LanaiTargetMachine &getLanaiTargetMachine() const {
93     return getTM<LanaiTargetMachine>();
94   }
95 
96   bool addInstSelector() override;
97   void addPreSched2() override;
98   void addPreEmitPass() override;
99 };
100 } // namespace
101 
102 TargetPassConfig *
103 LanaiTargetMachine::createPassConfig(PassManagerBase &PassManager) {
104   return new LanaiPassConfig(*this, &PassManager);
105 }
106 
107 // Install an instruction selector pass.
108 bool LanaiPassConfig::addInstSelector() {
109   addPass(createLanaiISelDag(getLanaiTargetMachine()));
110   return false;
111 }
112 
113 // Implemented by targets that want to run passes immediately before
114 // machine code is emitted.
115 void LanaiPassConfig::addPreEmitPass() {
116   addPass(createLanaiDelaySlotFillerPass(getLanaiTargetMachine()));
117 }
118 
119 // Run passes after prolog-epilog insertion and before the second instruction
120 // scheduling pass.
121 void LanaiPassConfig::addPreSched2() {
122   addPass(createLanaiMemAluCombinerPass());
123 }
124