xref: /freebsd/contrib/llvm-project/llvm/lib/Target/CSKY/CSKYTargetMachine.cpp (revision 5b56413d04e608379c9a306373554a8e4d321bc0)
1 //===--- CSKYTargetMachine.cpp - Define TargetMachine for CSKY ------------===//
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 CSKY target spec.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "CSKYTargetMachine.h"
14 #include "CSKY.h"
15 #include "CSKYMachineFunctionInfo.h"
16 #include "CSKYSubtarget.h"
17 #include "CSKYTargetObjectFile.h"
18 #include "TargetInfo/CSKYTargetInfo.h"
19 #include "llvm/CodeGen/MachineFrameInfo.h"
20 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
21 #include "llvm/CodeGen/TargetPassConfig.h"
22 #include "llvm/CodeGen/TargetSubtargetInfo.h"
23 #include "llvm/MC/TargetRegistry.h"
24 #include <optional>
25 
26 using namespace llvm;
27 
28 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeCSKYTarget() {
29   RegisterTargetMachine<CSKYTargetMachine> X(getTheCSKYTarget());
30 
31   PassRegistry *Registry = PassRegistry::getPassRegistry();
32   initializeCSKYConstantIslandsPass(*Registry);
33   initializeCSKYDAGToDAGISelPass(*Registry);
34 }
35 
36 static std::string computeDataLayout(const Triple &TT) {
37   std::string Ret;
38 
39   // Only support little endian for now.
40   // TODO: Add support for big endian.
41   Ret += "e";
42 
43   // CSKY is always 32-bit target with the CSKYv2 ABI as prefer now.
44   // It's a 4-byte aligned stack with ELF mangling only.
45   Ret += "-m:e-S32-p:32:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:32:32"
46          "-v128:32:32-a:0:32-Fi32-n32";
47 
48   return Ret;
49 }
50 
51 CSKYTargetMachine::CSKYTargetMachine(const Target &T, const Triple &TT,
52                                      StringRef CPU, StringRef FS,
53                                      const TargetOptions &Options,
54                                      std::optional<Reloc::Model> RM,
55                                      std::optional<CodeModel::Model> CM,
56                                      CodeGenOptLevel OL, bool JIT)
57     : LLVMTargetMachine(T, computeDataLayout(TT), TT, CPU, FS, Options,
58                         RM.value_or(Reloc::Static),
59                         getEffectiveCodeModel(CM, CodeModel::Small), OL),
60       TLOF(std::make_unique<CSKYELFTargetObjectFile>()) {
61   initAsmInfo();
62 }
63 
64 const CSKYSubtarget *
65 CSKYTargetMachine::getSubtargetImpl(const Function &F) const {
66   Attribute CPUAttr = F.getFnAttribute("target-cpu");
67   Attribute TuneAttr = F.getFnAttribute("tune-cpu");
68   Attribute FSAttr = F.getFnAttribute("target-features");
69 
70   std::string CPU =
71       CPUAttr.isValid() ? CPUAttr.getValueAsString().str() : TargetCPU;
72   std::string TuneCPU =
73       TuneAttr.isValid() ? TuneAttr.getValueAsString().str() : CPU;
74   std::string FS =
75       FSAttr.isValid() ? FSAttr.getValueAsString().str() : TargetFS;
76 
77   std::string Key = CPU + TuneCPU + FS;
78   auto &I = SubtargetMap[Key];
79   if (!I) {
80     // This needs to be done before we create a new subtarget since any
81     // creation will depend on the TM and the code generation flags on the
82     // function that reside in TargetOptions.
83     resetTargetOptions(F);
84     I = std::make_unique<CSKYSubtarget>(TargetTriple, CPU, TuneCPU, FS, *this);
85     if (I->useHardFloat() && !I->hasAnyFloatExt())
86       errs() << "Hard-float can't be used with current CPU,"
87                 " set to Soft-float\n";
88   }
89   return I.get();
90 }
91 
92 MachineFunctionInfo *CSKYTargetMachine::createMachineFunctionInfo(
93     BumpPtrAllocator &Allocator, const Function &F,
94     const TargetSubtargetInfo *STI) const {
95   return CSKYMachineFunctionInfo::create<CSKYMachineFunctionInfo>(Allocator, F,
96                                                                   STI);
97 }
98 
99 namespace {
100 class CSKYPassConfig : public TargetPassConfig {
101 public:
102   CSKYPassConfig(CSKYTargetMachine &TM, PassManagerBase &PM)
103       : TargetPassConfig(TM, PM) {}
104 
105   CSKYTargetMachine &getCSKYTargetMachine() const {
106     return getTM<CSKYTargetMachine>();
107   }
108 
109   void addIRPasses() override;
110   bool addInstSelector() override;
111   void addPreEmitPass() override;
112 };
113 
114 } // namespace
115 
116 TargetPassConfig *CSKYTargetMachine::createPassConfig(PassManagerBase &PM) {
117   return new CSKYPassConfig(*this, PM);
118 }
119 
120 void CSKYPassConfig::addIRPasses() {
121   addPass(createAtomicExpandPass());
122   TargetPassConfig::addIRPasses();
123 }
124 
125 bool CSKYPassConfig::addInstSelector() {
126   addPass(createCSKYISelDag(getCSKYTargetMachine(), getOptLevel()));
127 
128   return false;
129 }
130 
131 void CSKYPassConfig::addPreEmitPass() {
132   addPass(createCSKYConstantIslandPass());
133 }
134