| //===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // 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, |
| MaybeAlign StackAlignOverride) |
| : MipsGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS), |
| MipsArchVersion(MipsDefault), IsLittle(little), IsSoftFloat(false), |
| IsSingleFloat(false), IsFPXX(false), NoABICalls(false), Abs2008(false), |
| IsFP64bit(false), UseOddSPReg(true), IsNaN2008bit(false), |
| IsGP64bit(false), HasVFPU(false), HasCnMips(false), HasCnMipsP(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 (isFP64bit() && !hasMips64() && hasMips32() && !hasMips32r2()) |
| report_fatal_error( |
| "FPU with 64-bit registers is not available on MIPS32 pre revision 2. " |
| "Use -mcpu=mips32r2 or greater."); |
| |
| 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 (inAbs2008Mode() && hasMips32() && !hasMips32r2()) { |
| report_fatal_error("IEEE 754-2008 abs.fmt is not supported for the given " |
| "architecture.", |
| false); |
| } |
| |
| if (hasMips32r6()) { |
| StringRef ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6"; |
| |
| assert(isFP64bit()); |
| assert(isNaN2008()); |
| assert(inAbs2008Mode()); |
| 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) { |
| StringRef CPUName = MIPS_MC::selectMipsCPU(TM.getTargetTriple(), CPU); |
| |
| // Parse features string. |
| ParseSubtargetFeatures(CPUName, /*TuneCPU*/ 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 = Align(16); |
| else { |
| assert(isABI_O32() && "Unknown ABI for stack alignment!"); |
| stackAlignment = Align(8); |
| } |
| |
| if ((isABI_N32() || isABI_N64()) && !isGP64bit()) |
| report_fatal_error("64-bit code requested on a subtarget that doesn't " |
| "support it!"); |
| |
| 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(); |
| } |
| |
| InstructionSelector *MipsSubtarget::getInstructionSelector() const { |
| return InstSelector.get(); |
| } |
