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