lib/Target/SystemZ/SystemZSubtarget.cpp

   1 //===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
   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 #include "SystemZSubtarget.h"
  10 #include "MCTargetDesc/SystemZMCTargetDesc.h"
  11 #include "llvm/IR/GlobalValue.h"
  12
  13 using namespace llvm;
  14
  15 #define DEBUG_TYPE "systemz-subtarget"
  16
  17 #define GET_SUBTARGETINFO_TARGET_DESC
  18 #define GET_SUBTARGETINFO_CTOR
  19 #include "SystemZGenSubtargetInfo.inc"
  20
  21 static cl::opt<bool> UseSubRegLiveness(
  22     "systemz-subreg-liveness",
  23     cl::desc("Enable subregister liveness tracking for SystemZ (experimental)"),
  24     cl::Hidden);
  25
  26 // Pin the vtable to this file.
  27 void SystemZSubtarget::anchor() {}
  28
  29 SystemZSubtarget &
  30 SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
  31   std::string CPUName = CPU;
  32   if (CPUName.empty())
  33     CPUName = "generic";
  34   // Parse features string.
  35   ParseSubtargetFeatures(CPUName, FS);
  36   return *this;
  37 }
  38
  39 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
  40                                    const std::string &FS,
  41                                    const TargetMachine &TM)
  42     : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
  43       HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
  44       HasPopulationCount(false), HasMessageSecurityAssist3(false),
  45       HasMessageSecurityAssist4(false), HasResetReferenceBitsMultiple(false),
  46       HasFastSerialization(false), HasInterlockedAccess1(false),
  47       HasMiscellaneousExtensions(false),
  48       HasExecutionHint(false), HasLoadAndTrap(false),
  49       HasTransactionalExecution(false), HasProcessorAssist(false),
  50       HasDFPZonedConversion(false), HasEnhancedDAT2(false),
  51       HasVector(false), HasLoadStoreOnCond2(false),
  52       HasLoadAndZeroRightmostByte(false), HasMessageSecurityAssist5(false),
  53       HasDFPPackedConversion(false),
  54       HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
  55       HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
  56       HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
  57       HasInsertReferenceBitsMultiple(false),
  58       HasMiscellaneousExtensions3(false), HasMessageSecurityAssist9(false),
  59       HasVectorEnhancements2(false), HasVectorPackedDecimalEnhancement(false),
  60       HasEnhancedSort(false), HasDeflateConversion(false),
  61       TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
  62       TLInfo(TM, *this), TSInfo(), FrameLowering() {}
  63
  64
  65 bool SystemZSubtarget::enableSubRegLiveness() const {
  66   return UseSubRegLiveness;
  67 }
  68
  69 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
  70                                        CodeModel::Model CM) const {
  71   // PC32DBL accesses require the low bit to be clear.  Note that a zero
  72   // value selects the default alignment and is therefore OK.
  73   if (GV->getAlignment() == 1)
  74     return false;
  75
  76   // For the small model, all locally-binding symbols are in range.
  77   if (CM == CodeModel::Small)
  78     return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
  79
  80   // For Medium and above, assume that the symbol is not within the 4GB range.
  81   // Taking the address of locally-defined text would be OK, but that
  82   // case isn't easy to detect.
  83   return false;
  84 }