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 } 85