1//===-- SystemZConstantPoolValue.cpp - SystemZ constant-pool value --------===//
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 "SystemZConstantPoolValue.h"
11#include "llvm/ADT/FoldingSet.h"
12#include "llvm/IR/DerivedTypes.h"
13#include "llvm/IR/GlobalValue.h"
14#include "llvm/Support/raw_ostream.h"
15
16using namespace llvm;
17
18SystemZConstantPoolValue::
19SystemZConstantPoolValue(const GlobalValue *gv,
20                         SystemZCP::SystemZCPModifier modifier)
21  : MachineConstantPoolValue(gv->getType()), GV(gv), Modifier(modifier) {}
22
23SystemZConstantPoolValue *
24SystemZConstantPoolValue::Create(const GlobalValue *GV,
25                                 SystemZCP::SystemZCPModifier Modifier) {
26  return new SystemZConstantPoolValue(GV, Modifier);
27}
28
29unsigned SystemZConstantPoolValue::getRelocationInfo() const {
30  switch (Modifier) {
31  case SystemZCP::TLSGD:
32  case SystemZCP::TLSLDM:
33  case SystemZCP::DTPOFF:
34    // May require a dynamic relocation.
35    return 2;
36  case SystemZCP::NTPOFF:
37    // May require a relocation, but the relocations are always resolved
38    // by the static linker.
39    return 1;
40  }
41  llvm_unreachable("Unknown modifier");
42}
43
44int SystemZConstantPoolValue::
45getExistingMachineCPValue(MachineConstantPool *CP, unsigned Alignment) {
46  unsigned AlignMask = Alignment - 1;
47  const std::vector<MachineConstantPoolEntry> &Constants = CP->getConstants();
48  for (unsigned I = 0, E = Constants.size(); I != E; ++I) {
49    if (Constants[I].isMachineConstantPoolEntry() &&
50        (Constants[I].getAlignment() & AlignMask) == 0) {
51      auto *ZCPV =
52        static_cast<SystemZConstantPoolValue *>(Constants[I].Val.MachineCPVal);
53      if (ZCPV->GV == GV && ZCPV->Modifier == Modifier)
54        return I;
55    }
56  }
57  return -1;
58}
59
60void SystemZConstantPoolValue::addSelectionDAGCSEId(FoldingSetNodeID &ID) {
61  ID.AddPointer(GV);
62  ID.AddInteger(Modifier);
63}
64
65void SystemZConstantPoolValue::print(raw_ostream &O) const {
66  O << GV << "@" << int(Modifier);
67}
68