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 "MCTargetDesc/SystemZMCTargetDesc.h"
12#include "llvm/IR/GlobalValue.h"
13
14using namespace llvm;
15
16#define DEBUG_TYPE "systemz-subtarget"
17
18#define GET_SUBTARGETINFO_TARGET_DESC
19#define GET_SUBTARGETINFO_CTOR
20#include "SystemZGenSubtargetInfo.inc"
21
22// Pin the vtable to this file.
23void SystemZSubtarget::anchor() {}
24
25SystemZSubtarget &
26SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
27  std::string CPUName = CPU;
28  if (CPUName.empty())
29    CPUName = "generic";
30  // Parse features string.
31  ParseSubtargetFeatures(CPUName, FS);
32  return *this;
33}
34
35SystemZSubtarget::SystemZSubtarget(const std::string &TT,
36                                   const std::string &CPU,
37                                   const std::string &FS,
38                                   const TargetMachine &TM)
39    : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
40      HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
41      HasPopulationCount(false), HasFastSerialization(false),
42      HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
43      HasTransactionalExecution(false), HasProcessorAssist(false),
44      TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
45      TLInfo(TM, *this), TSInfo(*TM.getDataLayout()), FrameLowering() {}
46
47// Return true if GV binds locally under reloc model RM.
48static bool bindsLocally(const GlobalValue *GV, Reloc::Model RM) {
49  // For non-PIC, all symbols bind locally.
50  if (RM == Reloc::Static)
51    return true;
52
53  return GV->hasLocalLinkage() || !GV->hasDefaultVisibility();
54}
55
56bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
57                                       Reloc::Model RM,
58                                       CodeModel::Model CM) const {
59  // PC32DBL accesses require the low bit to be clear.  Note that a zero
60  // value selects the default alignment and is therefore OK.
61  if (GV->getAlignment() == 1)
62    return false;
63
64  // For the small model, all locally-binding symbols are in range.
65  if (CM == CodeModel::Small)
66    return bindsLocally(GV, RM);
67
68  // For Medium and above, assume that the symbol is not within the 4GB range.
69  // Taking the address of locally-defined text would be OK, but that
70  // case isn't easy to detect.
71  return false;
72}
73