SystemZSubtarget.cpp revision c60f9b752381baa6c4b80c0739034660f1748c84 
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_TARGET_DESC
21#define GET_SUBTARGETINFO_CTOR
22#include "SystemZGenSubtargetInfo.inc"
23
24using namespace llvm;
25
26SystemZSubtarget::SystemZSubtarget(const std::string &TT,
27                                   const std::string &CPU,
28                                   const std::string &FS):
29  SystemZGenSubtargetInfo(TT, CPU, FS), HasZ10Insts(false) {
30  std::string CPUName = CPU;
31  if (CPUName.empty())
32    CPUName = "z9";
33
34  // Parse features string.
35  ParseSubtargetFeatures(CPUName, FS);
36}
37
38/// True if accessing the GV requires an extra load.
39bool SystemZSubtarget::GVRequiresExtraLoad(const GlobalValue* GV,
40                                           const TargetMachine& TM,
41                                           bool isDirectCall) const {
42  if (TM.getRelocationModel() == Reloc::PIC_) {
43    // Extra load is needed for all externally visible.
44    if (isDirectCall)
45      return false;
46
47    if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
48      return false;
49
50    return true;
51  }
52
53  return false;
54}
55