MipsMachineFunction.cpp revision bb481f882093fb738d2bb15610c79364bada5496 
1//===-- MipsMachineFunctionInfo.cpp - Private data used for Mips ----------===//
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 "MipsMachineFunction.h"
11#include "MipsInstrInfo.h"
12#include "MipsSubtarget.h"
13#include "MCTargetDesc/MipsBaseInfo.h"
14#include "llvm/Function.h"
15#include "llvm/CodeGen/MachineInstrBuilder.h"
16#include "llvm/CodeGen/MachineRegisterInfo.h"
17#include "llvm/Support/CommandLine.h"
18
19using namespace llvm;
20
21static cl::opt<bool>
22FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true),
23                 cl::desc("Always use $gp as the global base register."));
24
25bool MipsFunctionInfo::globalBaseRegFixed() const {
26  return FixGlobalBaseReg;
27}
28
29bool MipsFunctionInfo::globalBaseRegSet() const {
30  return GlobalBaseReg;
31}
32
33unsigned MipsFunctionInfo::getGlobalBaseReg() {
34  // Return if it has already been initialized.
35  if (GlobalBaseReg)
36    return GlobalBaseReg;
37
38  const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
39
40  if (FixGlobalBaseReg) // $gp is the global base register.
41    return GlobalBaseReg = ST.isABI_N64() ? Mips::GP_64 : Mips::GP;
42
43  const TargetRegisterClass *RC;
44  RC = ST.isABI_N64() ?
45    Mips::CPU64RegsRegisterClass : Mips::CPURegsRegisterClass;
46
47  return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC);
48}
49
50void MipsFunctionInfo::anchor() { }
51