lib/Target/SystemZ/SystemZSubtarget.cpp

   1 //===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "SystemZSubtarget.h"
  11 #include "MCTargetDesc/SystemZMCTargetDesc.h"
  12 #include "llvm/IR/GlobalValue.h"
  13
  14 using namespace llvm;
  15
  16 #define DEBUG_TYPE "systemz-subtarget"
  17
  18 #define GET_SUBTARGETINFO_TARGET_DESC
  19 #define GET_SUBTARGETINFO_CTOR
  20 #include "SystemZGenSubtargetInfo.inc"
  21
  22 static cl::opt<bool> UseSubRegLiveness(
  23     "systemz-subreg-liveness",
  24     cl::desc("Enable subregister liveness tracking for SystemZ (experimental)"),
  25     cl::Hidden);
  26
  27 // Pin the vtable to this file.
  28 void SystemZSubtarget::anchor() {}
  29
  30 SystemZSubtarget &
  31 SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
  32   std::string CPUName = CPU;
  33   if (CPUName.empty())
  34     CPUName = "generic";
  35   // Parse features string.
  36   ParseSubtargetFeatures(CPUName, FS);
  37   return *this;
  38 }
  39
  40 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
  41                                    const std::string &FS,
  42                                    const TargetMachine &TM)
  43     : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
  44       HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
  45       HasPopulationCount(false), HasMessageSecurityAssist3(false),
  46       HasMessageSecurityAssist4(false), HasResetReferenceBitsMultiple(false),
  47       HasFastSerialization(false), HasInterlockedAccess1(false),
  48       HasMiscellaneousExtensions(false),
  49       HasExecutionHint(false), HasLoadAndTrap(false),
  50       HasTransactionalExecution(false), HasProcessorAssist(false),
  51       HasDFPZonedConversion(false), HasEnhancedDAT2(false),
  52       HasVector(false), HasLoadStoreOnCond2(false),
  53       HasLoadAndZeroRightmostByte(false), HasMessageSecurityAssist5(false),
  54       HasDFPPackedConversion(false),
  55       HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
  56       HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
  57       HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
  58       HasInsertReferenceBitsMultiple(false),
  59       TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
  60       TLInfo(TM, *this), TSInfo(), FrameLowering() {}
  61
  62
  63 bool SystemZSubtarget::enableSubRegLiveness() const {
  64   return UseSubRegLiveness;
  65 }
  66
  67 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
  68                                        CodeModel::Model CM) const {
  69   // PC32DBL accesses require the low bit to be clear.  Note that a zero
  70   // value selects the default alignment and is therefore OK.
  71   if (GV->getAlignment() == 1)
  72     return false;
  73
  74   // For the small model, all locally-binding symbols are in range.
  75   if (CM == CodeModel::Small)
  76     return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
  77
  78   // For Medium and above, assume that the symbol is not within the 4GB range.
  79   // Taking the address of locally-defined text would be OK, but that
  80   // case isn't easy to detect.
  81   return false;
  82 }