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