SystemZSubtarget.cpp revision 59ee62d2418df8db499eca1ae17f5900dc2dcbba 
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
26using namespace llvm;
27
28SystemZSubtarget::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.
41bool 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
58MCSubtargetInfo *createSystemZMCSubtargetInfo(StringRef TT, StringRef CPU,
59                                              StringRef FS) {
60  MCSubtargetInfo *X = new MCSubtargetInfo();
61  InitSystemZMCSubtargetInfo(X, TT, CPU, FS);
62  return X;
63}
64
65extern "C" void LLVMInitializeSystemZMCSubtargetInfo() {
66  TargetRegistry::RegisterMCSubtargetInfo(TheSystemZTarget,
67                                          createSystemZMCSubtargetInfo);
68}
69