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, FS); 37 38 // -msoft-float implies -mno-vx. 39 if (HasSoftFloat) 40 HasVector = false; 41 42 return *this; 43 } 44 45 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU, 46 const std::string &FS, 47 const TargetMachine &TM) 48 : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false), 49 HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false), 50 HasPopulationCount(false), HasMessageSecurityAssist3(false), 51 HasMessageSecurityAssist4(false), HasResetReferenceBitsMultiple(false), 52 HasFastSerialization(false), HasInterlockedAccess1(false), 53 HasMiscellaneousExtensions(false), 54 HasExecutionHint(false), HasLoadAndTrap(false), 55 HasTransactionalExecution(false), HasProcessorAssist(false), 56 HasDFPZonedConversion(false), HasEnhancedDAT2(false), 57 HasVector(false), HasLoadStoreOnCond2(false), 58 HasLoadAndZeroRightmostByte(false), HasMessageSecurityAssist5(false), 59 HasDFPPackedConversion(false), 60 HasMiscellaneousExtensions2(false), HasGuardedStorage(false), 61 HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false), 62 HasVectorEnhancements1(false), HasVectorPackedDecimal(false), 63 HasInsertReferenceBitsMultiple(false), 64 HasMiscellaneousExtensions3(false), HasMessageSecurityAssist9(false), 65 HasVectorEnhancements2(false), HasVectorPackedDecimalEnhancement(false), 66 HasEnhancedSort(false), HasDeflateConversion(false), HasSoftFloat(false), 67 TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)), 68 TLInfo(TM, *this), TSInfo(), FrameLowering() {} 69 70 71 bool SystemZSubtarget::enableSubRegLiveness() const { 72 return UseSubRegLiveness; 73 } 74 75 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV, 76 CodeModel::Model CM) const { 77 // PC32DBL accesses require the low bit to be clear. 78 // 79 // FIXME: Explicitly check for functions: the datalayout is currently 80 // missing information about function pointers. 81 const DataLayout &DL = GV->getParent()->getDataLayout(); 82 if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy()) 83 return false; 84 85 // For the small model, all locally-binding symbols are in range. 86 if (CM == CodeModel::Small) 87 return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV); 88 89 // For Medium and above, assume that the symbol is not within the 4GB range. 90 // Taking the address of locally-defined text would be OK, but that 91 // case isn't easy to detect. 92 return false; 93 } 94