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 14using 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. 23void SystemZSubtarget::anchor() {} 24 25SystemZSubtarget & 26SystemZSubtarget::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 35SystemZSubtarget::SystemZSubtarget(const std::string &TT, 36 const std::string &CPU, 37 const std::string &FS, 38 const TargetMachine &TM) 39 : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false), 40 HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false), 41 HasPopulationCount(false), HasFastSerialization(false), 42 HasInterlockedAccess1(false), HasMiscellaneousExtensions(false), 43 HasTransactionalExecution(false), HasProcessorAssist(false), 44 TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)), 45 TLInfo(TM, *this), TSInfo(*TM.getDataLayout()), FrameLowering() {} 46 47// Return true if GV binds locally under reloc model RM. 48static 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 56bool 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