lib/Target/SystemZ/SystemZSubtarget.cpp

   1 //===- SystemZSubtarget.cpp - SystemZ Subtarget Information -------*- C++ -*-=//
   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 // This file implements the SystemZ specific subclass of TargetSubtargetInfo.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "SystemZSubtarget.h"
  15 #include "SystemZ.h"
  16 #include "llvm/GlobalValue.h"
  17 #include "llvm/Target/TargetMachine.h"
  18 #include "llvm/Target/TargetRegistry.h"
  19
  20 #define GET_SUBTARGETINFO_ENUM
  21 #define GET_SUBTARGETINFO_MC_DESC
  22 #define GET_SUBTARGETINFO_TARGET_DESC
  23 #define GET_SUBTARGETINFO_CTOR
  24 #include "SystemZGenSubtargetInfo.inc"
  25
  26 using namespace llvm;
  27
  28 SystemZSubtarget::SystemZSubtarget(const std::string &TT,
  29                                    const std::string &CPU,
  30                                    const std::string &FS):
  31   SystemZGenSubtargetInfo(TT, CPU, FS), HasZ10Insts(false) {
  32   std::string CPUName = CPU;
  33   if (CPUName.empty())
  34     CPUName = "z9";
  35
  36   // Parse features string.
  37   ParseSubtargetFeatures(CPUName, FS);
  38 }
  39
  40 /// True if accessing the GV requires an extra load.
  41 bool SystemZSubtarget::GVRequiresExtraLoad(const GlobalValue* GV,
  42                                            const TargetMachine& TM,
  43                                            bool isDirectCall) const {
  44   if (TM.getRelocationModel() == Reloc::PIC_) {
  45     // Extra load is needed for all externally visible.
  46     if (isDirectCall)
  47       return false;
  48
  49     if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
  50       return false;
  51
  52     return true;
  53   }
  54
  55   return false;
  56 }
  57
  58 MCSubtargetInfo *createSystemZMCSubtargetInfo(StringRef TT, StringRef CPU,
  59                                               StringRef FS) {
  60   MCSubtargetInfo *X = new MCSubtargetInfo();
  61   InitSystemZMCSubtargetInfo(X, CPU, FS);
  62   return X;
  63 }
  64
  65 extern "C" void LLVMInitializeSystemZMCSubtargetInfo() {
  66   TargetRegistry::RegisterMCSubtargetInfo(TheSystemZTarget,
  67                                           createSystemZMCSubtargetInfo);
  68 }