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