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 FrameLowering(SystemZFrameLowering::create(*this)) {} 93 94 bool SystemZSubtarget::enableSubRegLiveness() const { 95 return UseSubRegLiveness; 96 } 97 98 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV, 99 CodeModel::Model CM) const { 100 // PC32DBL accesses require the low bit to be clear. 101 // 102 // FIXME: Explicitly check for functions: the datalayout is currently 103 // missing information about function pointers. 104 const DataLayout &DL = GV->getParent()->getDataLayout(); 105 if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy()) 106 return false; 107 108 // For the small model, all locally-binding symbols are in range. 109 if (CM == CodeModel::Small) 110 return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV); 111 112 // For Medium and above, assume that the symbol is not within the 4GB range. 113 // Taking the address of locally-defined text would be OK, but that 114 // case isn't easy to detect. 115 return false; 116 } 117