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