text: //===-- SystemZSubtarget.cpp - SystemZ 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
  //
  //===----------------------------------------------------------------------===//
  
  #include "SystemZSubtarget.h"
  #include "MCTargetDesc/SystemZMCTargetDesc.h"
  #include "llvm/IR/GlobalValue.h"
  #include "llvm/Target/TargetMachine.h"
  
  using namespace llvm;
  
  #define DEBUG_TYPE "systemz-subtarget"
  
  #define GET_SUBTARGETINFO_TARGET_DESC
  #define GET_SUBTARGETINFO_CTOR
  #include "SystemZGenSubtargetInfo.inc"
  
  static cl::opt<bool> UseSubRegLiveness(
      "systemz-subreg-liveness",
      cl::desc("Enable subregister liveness tracking for SystemZ (experimental)"),
      cl::Hidden);
  
  // Pin the vtable to this file.
  void SystemZSubtarget::anchor() {}
  
  SystemZSubtarget &
  SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
    StringRef CPUName = CPU;
    if (CPUName.empty())
      CPUName = "generic";
    // Parse features string.
    ParseSubtargetFeatures(CPUName, /*TuneCPU*/ CPUName, FS);
  
    // -msoft-float implies -mno-vx.
    if (HasSoftFloat)
      HasVector = false;
  
    // -mno-vx implicitly disables all vector-related features.
    if (!HasVector) {
      HasVectorEnhancements1 = false;
      HasVectorEnhancements2 = false;
      HasVectorPackedDecimal = false;
      HasVectorPackedDecimalEnhancement = false;
    }
  
    return *this;
  }
  
  SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
                                     const std::string &FS,
                                     const TargetMachine &TM)
      : SystemZGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS),
        HasDistinctOps(false), HasLoadStoreOnCond(false), HasHighWord(false),
        HasFPExtension(false), HasPopulationCount(false),
        HasMessageSecurityAssist3(false), HasMessageSecurityAssist4(false),
        HasResetReferenceBitsMultiple(false), HasFastSerialization(false),
        HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
        HasExecutionHint(false), HasLoadAndTrap(false),
        HasTransactionalExecution(false), HasProcessorAssist(false),
        HasDFPZonedConversion(false), HasEnhancedDAT2(false),
        HasVector(false), HasLoadStoreOnCond2(false),
        HasLoadAndZeroRightmostByte(false), HasMessageSecurityAssist5(false),
        HasDFPPackedConversion(false),
        HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
        HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
        HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
        HasInsertReferenceBitsMultiple(false),
        HasMiscellaneousExtensions3(false), HasMessageSecurityAssist9(false),
        HasVectorEnhancements2(false), HasVectorPackedDecimalEnhancement(false),
        HasEnhancedSort(false), HasDeflateConversion(false), HasSoftFloat(false),
        TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
        TLInfo(TM, *this), TSInfo(), FrameLowering() {}
  
  
  bool SystemZSubtarget::enableSubRegLiveness() const {
    return UseSubRegLiveness;
  }
  
  bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
                                         CodeModel::Model CM) const {
    // PC32DBL accesses require the low bit to be clear.
    //
    // FIXME: Explicitly check for functions: the datalayout is currently
    // missing information about function pointers.
    const DataLayout &DL = GV->getParent()->getDataLayout();
    if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy())
      return false;
  
    // For the small model, all locally-binding symbols are in range.
    if (CM == CodeModel::Small)
      return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
  
    // For Medium and above, assume that the symbol is not within the 4GB range.
    // Taking the address of locally-defined text would be OK, but that
    // case isn't easy to detect.
    return false;
  }
  