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 TargetSubtarget.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "SystemZSubtarget.h"
  15 #include "SystemZ.h"
  16 #include "SystemZGenSubtarget.inc"
  17 #include "llvm/GlobalValue.h"
  18 #include "llvm/Target/TargetMachine.h"
  19
  20 using namespace llvm;
  21
  22 SystemZSubtarget::SystemZSubtarget(const std::string &TT,
  23                                    const std::string &FS):
  24   HasZ10Insts(false) {
  25   std::string CPU = "z9";
  26
  27   // Parse features string.
  28   ParseSubtargetFeatures(FS, CPU);
  29 }
  30
  31 /// True if accessing the GV requires an extra load.
  32 bool SystemZSubtarget::GVRequiresExtraLoad(const GlobalValue* GV,
  33                                            const TargetMachine& TM,
  34                                            bool isDirectCall) const {
  35   if (TM.getRelocationModel() == Reloc::PIC_) {
  36     // Extra load is needed for all externally visible.
  37     if (isDirectCall)
  38       return false;
  39
  40     if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
  41       return false;
  42
  43     return true;
  44   }
  45
  46   return false;
  47 }