1 //===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "SystemZSubtarget.h" 11 #include "MCTargetDesc/SystemZMCTargetDesc.h" 12 #include "llvm/IR/GlobalValue.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 // Pin the vtable to this file. 23 void SystemZSubtarget::anchor() {} 24 25 SystemZSubtarget & 26 SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) { 27 std::string CPUName = CPU; 28 if (CPUName.empty()) 29 CPUName = "generic"; 30 // Parse features string. 31 ParseSubtargetFeatures(CPUName, FS); 32 return *this; 33 } 34 35 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU, 36 const std::string &FS, 37 const TargetMachine &TM) 38 : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false), 39 HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false), 40 HasPopulationCount(false), HasFastSerialization(false), 41 HasInterlockedAccess1(false), HasMiscellaneousExtensions(false), 42 HasTransactionalExecution(false), HasProcessorAssist(false), 43 HasVector(false), TargetTriple(TT), 44 InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this), 45 TSInfo(), FrameLowering() {} 46 47 // Return true if GV binds locally under reloc model RM. 48 static bool bindsLocally(const GlobalValue *GV, Reloc::Model RM) { 49 // For non-PIC, all symbols bind locally. 50 if (RM == Reloc::Static) 51 return true; 52 53 return GV->hasLocalLinkage() || !GV->hasDefaultVisibility(); 54 } 55 56 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV, 57 Reloc::Model RM, 58 CodeModel::Model CM) const { 59 // PC32DBL accesses require the low bit to be clear. Note that a zero 60 // value selects the default alignment and is therefore OK. 61 if (GV->getAlignment() == 1) 62 return false; 63 64 // For the small model, all locally-binding symbols are in range. 65 if (CM == CodeModel::Small) 66 return bindsLocally(GV, RM); 67 68 // For Medium and above, assume that the symbol is not within the 4GB range. 69 // Taking the address of locally-defined text would be OK, but that 70 // case isn't easy to detect. 71 return false; 72 } 73
