MipsMachineFunction.cpp revision fef904d0e824a2c587f8c1063b6c4fbf47fec898 
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::globalBaseRegSet() const {
26  return GlobalBaseReg;
27}
28
29unsigned MipsFunctionInfo::getGlobalBaseReg() {
30  // Return if it has already been initialized.
31  if (GlobalBaseReg)
32    return GlobalBaseReg;
33
34  const MipsSubtarget &ST = MF.getTarget().getSubtarget<MipsSubtarget>();
35
36  const TargetRegisterClass *RC = ST.isABI_N64() ?
37    (const TargetRegisterClass*)&Mips::CPU64RegsRegClass :
38    (const TargetRegisterClass*)&Mips::CPURegsRegClass;
39
40  return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC);
41}
42
43void MipsFunctionInfo::anchor() { }
44