llvm/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 #include "llvm/Target/TargetMachine.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   StringRef CPUName = CPU;
  33   if (CPUName.empty())
  34     CPUName = "generic";
  35   // Parse features string.
  36   ParseSubtargetFeatures(CPUName, /*TuneCPU*/ CPUName, FS);
  37
  38   // -msoft-float implies -mno-vx.
  39   if (HasSoftFloat)
  40     HasVector = false;
  41
  42   // -mno-vx implicitly disables all vector-related features.
  43   if (!HasVector) {
  44     HasVectorEnhancements1 = false;
  45     HasVectorEnhancements2 = false;
  46     HasVectorPackedDecimal = false;
  47     HasVectorPackedDecimalEnhancement = false;
  48     HasVectorPackedDecimalEnhancement2 = false;
  49   }
  50
  51   return *this;
  52 }
  53
  54 SystemZCallingConventionRegisters *
  55 SystemZSubtarget::initializeSpecialRegisters() {
  56   if (isTargetXPLINK64())
  57     return new SystemZXPLINK64Registers;
  58   else if (isTargetELF())
  59     return new SystemZELFRegisters;
  60   else {
  61     llvm_unreachable("Invalid Calling Convention. Cannot initialize Special "
  62                      "Call Registers!");
  63   }
  64 }
  65
  66 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
  67                                    const std::string &FS,
  68                                    const TargetMachine &TM)
  69     : SystemZGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS),
  70       HasDistinctOps(false), HasLoadStoreOnCond(false), HasHighWord(false),
  71       HasFPExtension(false), HasPopulationCount(false),
  72       HasMessageSecurityAssist3(false), HasMessageSecurityAssist4(false),
  73       HasResetReferenceBitsMultiple(false), HasFastSerialization(false),
  74       HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
  75       HasExecutionHint(false), HasLoadAndTrap(false),
  76       HasTransactionalExecution(false), HasProcessorAssist(false),
  77       HasDFPZonedConversion(false), HasEnhancedDAT2(false), HasVector(false),
  78       HasLoadStoreOnCond2(false), HasLoadAndZeroRightmostByte(false),
  79       HasMessageSecurityAssist5(false), HasDFPPackedConversion(false),
  80       HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
  81       HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
  82       HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
  83       HasInsertReferenceBitsMultiple(false), HasMiscellaneousExtensions3(false),
  84       HasMessageSecurityAssist9(false), HasVectorEnhancements2(false),
  85       HasVectorPackedDecimalEnhancement(false), HasEnhancedSort(false),
  86       HasDeflateConversion(false), HasVectorPackedDecimalEnhancement2(false),
  87       HasNNPAssist(false), HasBEAREnhancement(false),
  88       HasResetDATProtection(false), HasProcessorActivityInstrumentation(false),
  89       HasSoftFloat(false), TargetTriple(TT),
  90       SpecialRegisters(initializeSpecialRegisters()),
  91       InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
  92       TSInfo(), FrameLowering() {}
  93
  94 SystemZSubtarget::~SystemZSubtarget() { delete getSpecialRegisters(); }
  95
  96 bool SystemZSubtarget::enableSubRegLiveness() const {
  97   return UseSubRegLiveness;
  98 }
  99
 100 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
 101                                        CodeModel::Model CM) const {
 102   // PC32DBL accesses require the low bit to be clear.
 103   //
 104   // FIXME: Explicitly check for functions: the datalayout is currently
 105   // missing information about function pointers.
 106   const DataLayout &DL = GV->getParent()->getDataLayout();
 107   if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy())
 108     return false;
 109
 110   // For the small model, all locally-binding symbols are in range.
 111   if (CM == CodeModel::Small)
 112     return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
 113
 114   // For Medium and above, assume that the symbol is not within the 4GB range.
 115   // Taking the address of locally-defined text would be OK, but that
 116   // case isn't easy to detect.
 117   return false;
 118 }