| //===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===// | |
| // | |
| // The LLVM Compiler Infrastructure | |
| // | |
| // This file is distributed under the University of Illinois Open Source | |
| // License. See LICENSE.TXT for details. | |
| // | |
| //===----------------------------------------------------------------------===// | |
| // | |
| // This file implements the Mips specific subclass of TargetSubtargetInfo. | |
| // | |
| //===----------------------------------------------------------------------===// | |
| #include "MipsSubtarget.h" | |
| #include "Mips.h" | |
| #include "MipsMachineFunction.h" | |
| #include "MipsRegisterInfo.h" | |
| #include "MipsTargetMachine.h" | |
| #include "MipsCallLowering.h" | |
| #include "MipsLegalizerInfo.h" | |
| #include "MipsRegisterBankInfo.h" | |
| #include "llvm/IR/Attributes.h" | |
| #include "llvm/IR/Function.h" | |
| #include "llvm/Support/CommandLine.h" | |
| #include "llvm/Support/Debug.h" | |
| #include "llvm/Support/TargetRegistry.h" | |
| #include "llvm/Support/raw_ostream.h" | |
| using namespace llvm; | |
| #define DEBUG_TYPE "mips-subtarget" | |
| #define GET_SUBTARGETINFO_TARGET_DESC | |
| #define GET_SUBTARGETINFO_CTOR | |
| #include "MipsGenSubtargetInfo.inc" | |
| // FIXME: Maybe this should be on by default when Mips16 is specified | |
| // | |
| static cl::opt<bool> | |
| Mixed16_32("mips-mixed-16-32", cl::init(false), | |
| cl::desc("Allow for a mixture of Mips16 " | |
| "and Mips32 code in a single output file"), | |
| cl::Hidden); | |
| static cl::opt<bool> Mips_Os16("mips-os16", cl::init(false), | |
| cl::desc("Compile all functions that don't use " | |
| "floating point as Mips 16"), | |
| cl::Hidden); | |
| static cl::opt<bool> Mips16HardFloat("mips16-hard-float", cl::NotHidden, | |
| cl::desc("Enable mips16 hard float."), | |
| cl::init(false)); | |
| static cl::opt<bool> | |
| Mips16ConstantIslands("mips16-constant-islands", cl::NotHidden, | |
| cl::desc("Enable mips16 constant islands."), | |
| cl::init(true)); | |
| static cl::opt<bool> | |
| GPOpt("mgpopt", cl::Hidden, | |
| cl::desc("Enable gp-relative addressing of mips small data items")); | |
| bool MipsSubtarget::DspWarningPrinted = false; | |
| bool MipsSubtarget::MSAWarningPrinted = false; | |
| bool MipsSubtarget::VirtWarningPrinted = false; | |
| bool MipsSubtarget::CRCWarningPrinted = false; | |
| bool MipsSubtarget::GINVWarningPrinted = false; | |
| void MipsSubtarget::anchor() {} | |
| MipsSubtarget::MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS, | |
| bool little, const MipsTargetMachine &TM, | |
| unsigned StackAlignOverride) | |
| : MipsGenSubtargetInfo(TT, CPU, FS), MipsArchVersion(MipsDefault), | |
| IsLittle(little), IsSoftFloat(false), IsSingleFloat(false), IsFPXX(false), | |
| NoABICalls(false), IsFP64bit(false), UseOddSPReg(true), | |
| IsNaN2008bit(false), IsGP64bit(false), HasVFPU(false), HasCnMips(false), | |
| HasMips3_32(false), HasMips3_32r2(false), HasMips4_32(false), | |
| HasMips4_32r2(false), HasMips5_32r2(false), InMips16Mode(false), | |
| InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false), | |
| HasDSPR2(false), HasDSPR3(false), AllowMixed16_32(Mixed16_32 | Mips_Os16), | |
| Os16(Mips_Os16), HasMSA(false), UseTCCInDIV(false), HasSym32(false), | |
| HasEVA(false), DisableMadd4(false), HasMT(false), HasCRC(false), | |
| HasVirt(false), HasGINV(false), UseIndirectJumpsHazard(false), | |
| StackAlignOverride(StackAlignOverride), | |
| TM(TM), TargetTriple(TT), TSInfo(), | |
| InstrInfo( | |
| MipsInstrInfo::create(initializeSubtargetDependencies(CPU, FS, TM))), | |
| FrameLowering(MipsFrameLowering::create(*this)), | |
| TLInfo(MipsTargetLowering::create(TM, *this)) { | |
| if (MipsArchVersion == MipsDefault) | |
| MipsArchVersion = Mips32; | |
| // Don't even attempt to generate code for MIPS-I and MIPS-V. They have not | |
| // been tested and currently exist for the integrated assembler only. | |
| if (MipsArchVersion == Mips1) | |
| report_fatal_error("Code generation for MIPS-I is not implemented", false); | |
| if (MipsArchVersion == Mips5) | |
| report_fatal_error("Code generation for MIPS-V is not implemented", false); | |
| // Check if Architecture and ABI are compatible. | |
| assert(((!isGP64bit() && isABI_O32()) || | |
| (isGP64bit() && (isABI_N32() || isABI_N64()))) && | |
| "Invalid Arch & ABI pair."); | |
| if (hasMSA() && !isFP64bit()) | |
| report_fatal_error("MSA requires a 64-bit FPU register file (FR=1 mode). " | |
| "See -mattr=+fp64.", | |
| false); | |
| if (!isABI_O32() && !useOddSPReg()) | |
| report_fatal_error("-mattr=+nooddspreg requires the O32 ABI.", false); | |
| if (IsFPXX && (isABI_N32() || isABI_N64())) | |
| report_fatal_error("FPXX is not permitted for the N32/N64 ABI's.", false); | |
| if (hasMips64r6() && InMicroMipsMode) | |
| report_fatal_error("microMIPS64R6 is not supported", false); | |
| if (!isABI_O32() && InMicroMipsMode) | |
| report_fatal_error("microMIPS64 is not supported.", false); | |
| if (UseIndirectJumpsHazard) { | |
| if (InMicroMipsMode) | |
| report_fatal_error( | |
| "cannot combine indirect jumps with hazard barriers and microMIPS"); | |
| if (!hasMips32r2()) | |
| report_fatal_error( | |
| "indirect jumps with hazard barriers requires MIPS32R2 or later"); | |
| } | |
| if (hasMips32r6()) { | |
| StringRef ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6"; | |
| assert(isFP64bit()); | |
| assert(isNaN2008()); | |
| if (hasDSP()) | |
| report_fatal_error(ISA + " is not compatible with the DSP ASE", false); | |
| } | |
| if (NoABICalls && TM.isPositionIndependent()) | |
| report_fatal_error("position-independent code requires '-mabicalls'"); | |
| if (isABI_N64() && !TM.isPositionIndependent() && !hasSym32()) | |
| NoABICalls = true; | |
| // Set UseSmallSection. | |
| UseSmallSection = GPOpt; | |
| if (!NoABICalls && GPOpt) { | |
| errs() << "warning: cannot use small-data accesses for '-mabicalls'" | |
| << "\n"; | |
| UseSmallSection = false; | |
| } | |
| if (hasDSPR2() && !DspWarningPrinted) { | |
| if (hasMips64() && !hasMips64r2()) { | |
| errs() << "warning: the 'dspr2' ASE requires MIPS64 revision 2 or " | |
| << "greater\n"; | |
| DspWarningPrinted = true; | |
| } else if (hasMips32() && !hasMips32r2()) { | |
| errs() << "warning: the 'dspr2' ASE requires MIPS32 revision 2 or " | |
| << "greater\n"; | |
| DspWarningPrinted = true; | |
| } | |
| } else if (hasDSP() && !DspWarningPrinted) { | |
| if (hasMips64() && !hasMips64r2()) { | |
| errs() << "warning: the 'dsp' ASE requires MIPS64 revision 2 or " | |
| << "greater\n"; | |
| DspWarningPrinted = true; | |
| } else if (hasMips32() && !hasMips32r2()) { | |
| errs() << "warning: the 'dsp' ASE requires MIPS32 revision 2 or " | |
| << "greater\n"; | |
| DspWarningPrinted = true; | |
| } | |
| } | |
| StringRef ArchName = hasMips64() ? "MIPS64" : "MIPS32"; | |
| if (!hasMips32r5() && hasMSA() && !MSAWarningPrinted) { | |
| errs() << "warning: the 'msa' ASE requires " << ArchName | |
| << " revision 5 or greater\n"; | |
| MSAWarningPrinted = true; | |
| } | |
| if (!hasMips32r5() && hasVirt() && !VirtWarningPrinted) { | |
| errs() << "warning: the 'virt' ASE requires " << ArchName | |
| << " revision 5 or greater\n"; | |
| VirtWarningPrinted = true; | |
| } | |
| if (!hasMips32r6() && hasCRC() && !CRCWarningPrinted) { | |
| errs() << "warning: the 'crc' ASE requires " << ArchName | |
| << " revision 6 or greater\n"; | |
| CRCWarningPrinted = true; | |
| } | |
| if (!hasMips32r6() && hasGINV() && !GINVWarningPrinted) { | |
| errs() << "warning: the 'ginv' ASE requires " << ArchName | |
| << " revision 6 or greater\n"; | |
| GINVWarningPrinted = true; | |
| } | |
| CallLoweringInfo.reset(new MipsCallLowering(*getTargetLowering())); | |
| Legalizer.reset(new MipsLegalizerInfo(*this)); | |
| auto *RBI = new MipsRegisterBankInfo(*getRegisterInfo()); | |
| RegBankInfo.reset(RBI); | |
| InstSelector.reset(createMipsInstructionSelector( | |
| *static_cast<const MipsTargetMachine *>(&TM), *this, *RBI)); | |
| } | |
| bool MipsSubtarget::isPositionIndependent() const { | |
| return TM.isPositionIndependent(); | |
| } | |
| /// This overrides the PostRAScheduler bit in the SchedModel for any CPU. | |
| bool MipsSubtarget::enablePostRAScheduler() const { return true; } | |
| void MipsSubtarget::getCriticalPathRCs(RegClassVector &CriticalPathRCs) const { | |
| CriticalPathRCs.clear(); | |
| CriticalPathRCs.push_back(isGP64bit() ? &Mips::GPR64RegClass | |
| : &Mips::GPR32RegClass); | |
| } | |
| CodeGenOpt::Level MipsSubtarget::getOptLevelToEnablePostRAScheduler() const { | |
| return CodeGenOpt::Aggressive; | |
| } | |
| MipsSubtarget & | |
| MipsSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS, | |
| const TargetMachine &TM) { | |
| std::string CPUName = MIPS_MC::selectMipsCPU(TM.getTargetTriple(), CPU); | |
| // Parse features string. | |
| ParseSubtargetFeatures(CPUName, FS); | |
| // Initialize scheduling itinerary for the specified CPU. | |
| InstrItins = getInstrItineraryForCPU(CPUName); | |
| if (InMips16Mode && !IsSoftFloat) | |
| InMips16HardFloat = true; | |
| if (StackAlignOverride) | |
| stackAlignment = StackAlignOverride; | |
| else if (isABI_N32() || isABI_N64()) | |
| stackAlignment = 16; | |
| else { | |
| assert(isABI_O32() && "Unknown ABI for stack alignment!"); | |
| stackAlignment = 8; | |
| } | |
| return *this; | |
| } | |
| bool MipsSubtarget::useConstantIslands() { | |
| LLVM_DEBUG(dbgs() << "use constant islands " << Mips16ConstantIslands | |
| << "\n"); | |
| return Mips16ConstantIslands; | |
| } | |
| Reloc::Model MipsSubtarget::getRelocationModel() const { | |
| return TM.getRelocationModel(); | |
| } | |
| bool MipsSubtarget::isABI_N64() const { return getABI().IsN64(); } | |
| bool MipsSubtarget::isABI_N32() const { return getABI().IsN32(); } | |
| bool MipsSubtarget::isABI_O32() const { return getABI().IsO32(); } | |
| const MipsABIInfo &MipsSubtarget::getABI() const { return TM.getABI(); } | |
| const CallLowering *MipsSubtarget::getCallLowering() const { | |
| return CallLoweringInfo.get(); | |
| } | |
| const LegalizerInfo *MipsSubtarget::getLegalizerInfo() const { | |
| return Legalizer.get(); | |
| } | |
| const RegisterBankInfo *MipsSubtarget::getRegBankInfo() const { | |
| return RegBankInfo.get(); | |
| } | |
| const InstructionSelector *MipsSubtarget::getInstructionSelector() const { | |
| return InstSelector.get(); | |
| } |