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