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