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Simplify MipsRegisterInfo::eliminateFrameIndex. 

llvm-svn: 134628
This commit is contained in:
Akira Hatanaka 2011-07-07 19:13:09 +00:00
parent 6dbe713a49
commit 9d1936a270
1 changed files with 14 additions and 34 deletions
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48
llvm/lib/Target/Mips/MipsRegisterInfo.cpp
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@ -218,51 +218,31 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
else
Offset = spOffset + stackSize;
if (MI.isDebugValue()) {
MI.getOperand(i).ChangeToRegister(FrameReg, false /*isDef*/);
MI.getOperand(i+1).ChangeToImmediate(Offset);
return;
}
Offset += MI.getOperand(i+1).getImm();
DEBUG(errs() << "Offset : " << Offset << "\n" << "<--------->\n");
unsigned NewReg = 0;
int NewImm = 0;
MachineBasicBlock &MBB = *MI.getParent();
bool ATUsed;
// Offset fits in the 16-bit field
if (Offset < 0x8000 && Offset >= -0x8000) {
NewReg = FrameReg;
NewImm = Offset;
ATUsed = false;
}
else {
const TargetInstrInfo *TII = MF.getTarget().getInstrInfo();
// If MI is not a debug value, make sure Offset fits in the 16-bit immediate
// field.
if (!MI.isDebugValue() && (Offset >= 0x8000 || Offset < -0x8000)) {
MachineBasicBlock &MBB = *MI.getParent();
DebugLoc DL = II->getDebugLoc();
int ImmLo = (short)(Offset & 0xffff);
int ImmHi = (((unsigned)Offset & 0xffff0000) >> 16) +
((Offset & 0x8000) != 0);
// FIXME: change this when mips goes MC".
BuildMI(MBB, II, DL, TII->get(Mips::NOAT));
BuildMI(MBB, II, DL, TII->get(Mips::LUi), Mips::AT).addImm(ImmHi);
BuildMI(MBB, II, DL, TII->get(Mips::ADDu), Mips::AT).addReg(FrameReg)
.addReg(Mips::AT);
NewReg = Mips::AT;
NewImm = ImmLo;
ATUsed = true;
BuildMI(MBB, II, DL, TII.get(Mips::NOAT));
BuildMI(MBB, II, DL, TII.get(Mips::LUi), Mips::AT).addImm(ImmHi);
BuildMI(MBB, II, DL, TII.get(Mips::ADDu), Mips::AT).addReg(FrameReg)
.addReg(Mips::AT);
FrameReg = Mips::AT;
Offset = (short)(Offset & 0xffff);
BuildMI(MBB, ++II, MI.getDebugLoc(), TII.get(Mips::ATMACRO));
}
// FIXME: change this when mips goes MC".
if (ATUsed)
BuildMI(MBB, ++II, MI.getDebugLoc(), TII.get(Mips::ATMACRO));
MI.getOperand(i).ChangeToRegister(NewReg, false);
MI.getOperand(i+1).ChangeToImmediate(NewImm);
MI.getOperand(i).ChangeToRegister(FrameReg, false);
MI.getOperand(i+1).ChangeToImmediate(Offset);
}
unsigned MipsRegisterInfo::