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 "llvm/IR/GlobalValue.h" 12 #include "llvm/Support/Host.h" 13 #include "MCTargetDesc/SystemZMCTargetDesc.h" 14 15 #define GET_SUBTARGETINFO_TARGET_DESC 16 #define GET_SUBTARGETINFO_CTOR 17 #include "SystemZGenSubtargetInfo.inc" 18 19 using namespace llvm; 20 21 // Pin the vtabel to this file. 22 void SystemZSubtarget::anchor() {} 23 24 SystemZSubtarget::SystemZSubtarget(const std::string &TT, 25 const std::string &CPU, 26 const std::string &FS) 27 : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false), 28 HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false), 29 TargetTriple(TT) { 30 std::string CPUName = CPU; 31 if (CPUName.empty()) 32 CPUName = "generic"; 33 #if defined(__linux__) && defined(__s390x__) 34 if (CPUName == "generic") 35 CPUName = sys::getHostCPUName(); 36 #endif 37 38 // Parse features string. 39 ParseSubtargetFeatures(CPUName, FS); 40 } 41 42 // Return true if GV binds locally under reloc model RM. 43 static bool bindsLocally(const GlobalValue *GV, Reloc::Model RM) { 44 // For non-PIC, all symbols bind locally. 45 if (RM == Reloc::Static) 46 return true; 47 48 return GV->hasLocalLinkage() || !GV->hasDefaultVisibility(); 49 } 50 51 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV, 52 Reloc::Model RM, 53 CodeModel::Model CM) const { 54 // PC32DBL accesses require the low bit to be clear. Note that a zero 55 // value selects the default alignment and is therefore OK. 56 if (GV->getAlignment() == 1) 57 return false; 58 59 // For the small model, all locally-binding symbols are in range. 60 if (CM == CodeModel::Small) 61 return bindsLocally(GV, RM); 62 63 // For Medium and above, assume that the symbol is not within the 4GB range. 64 // Taking the address of locally-defined text would be OK, but that 65 // case isn't easy to detect. 66 return false; 67 } 68