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Convert Alpha and Mips to use a MachineFunctionInfo subclass to

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carry GlobalBaseReg, and GlobalRetAddr too in Alpha's case. This
eliminates the need for them to search through the
MachineRegisterInfo livein list in order to identify these
virtual registers. EmitLiveInCopies is now the only user of the
virtual register portion of MachineRegisterInfo's livein data.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72802 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-06-03 20:30:14 +00:00
parent c553462c29
commit 9911405183
10 changed files with 205 additions and 65 deletions
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29
lib/Target/Mips/MipsInstrInfo.cpp
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@@ -13,8 +13,10 @@
#include "MipsInstrInfo.h"
#include "MipsTargetMachine.h"
#include "MipsMachineFunction.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "MipsGenInstrInfo.inc"
using namespace llvm;
@@ -621,3 +623,30 @@ ReverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const
Cond[0].setImm(GetOppositeBranchCondition((Mips::CondCode)Cond[0].getImm()));
return false;
}
/// getGlobalBaseReg - Return a virtual register initialized with the
/// the global base register value. Output instructions required to
/// initialize the register in the function entry block, if necessary.
///
unsigned MipsInstrInfo::getGlobalBaseReg(MachineFunction *MF) const {
MipsFunctionInfo *MipsFI = MF->getInfo<MipsFunctionInfo>();
unsigned GlobalBaseReg = MipsFI->getGlobalBaseReg();
if (GlobalBaseReg != 0)
return GlobalBaseReg;
// Insert the set of GlobalBaseReg into the first MBB of the function
MachineBasicBlock &FirstMBB = MF->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
MachineRegisterInfo &RegInfo = MF->getRegInfo();
const TargetInstrInfo *TII = MF->getTarget().getInstrInfo();
GlobalBaseReg = RegInfo.createVirtualRegister(Mips::CPURegsRegisterClass);
bool Ok = TII->copyRegToReg(FirstMBB, MBBI, GlobalBaseReg, Mips::GP,
Mips::CPURegsRegisterClass,
Mips::CPURegsRegisterClass);
assert(Ok && "Couldn't assign to global base register!");
RegInfo.addLiveIn(Mips::GP);
MipsFI->setGlobalBaseReg(GlobalBaseReg);
return GlobalBaseReg;
}