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 19 using namespace llvm; 20 21 static cl::opt<bool> 22 FixGlobalBaseReg("mips-fix-global-base-reg", cl::Hidden, cl::init(true), 23 cl::desc("Always use $gp as the global base register.")); 24 25 bool MipsFunctionInfo::globalBaseRegFixed() const { 26 return FixGlobalBaseReg; 27 } 28 29 bool MipsFunctionInfo::globalBaseRegSet() const { 30 return GlobalBaseReg; 31 } 32 33 unsigned 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 && ST.isABI_O32()) // $gp is the global base register. 41 return GlobalBaseReg = Mips::GP; 42 43 const TargetRegisterClass *RC = ST.isABI_N64() ? 44 (const TargetRegisterClass*)&Mips::CPU64RegsRegClass : 45 (const TargetRegisterClass*)&Mips::CPURegsRegClass; 46 47 return GlobalBaseReg = MF.getRegInfo().createVirtualRegister(RC); 48 } 49 50 void MipsFunctionInfo::anchor() { } 51