-void BlackfinRegisterInfo::
-processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
- RegScavenger *RS) const {
- MachineFrameInfo *MFI = MF.getFrameInfo();
- const TargetRegisterClass *RC = BF::DPRegisterClass;
- if (requiresRegisterScavenging(MF)) {
- // Reserve a slot close to SP or frame pointer.
- RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
- RC->getAlignment()));
- }
-}
-
-void BlackfinRegisterInfo::
-processFunctionBeforeFrameFinalized(MachineFunction &MF) const {
-}
-
-// Emit a prologue that sets up a stack frame.
-// On function entry, R0-R2 and P0 may hold arguments.
-// R3, P1, and P2 may be used as scratch registers
-void BlackfinRegisterInfo::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
- MachineBasicBlock::iterator MBBI = MBB.begin();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- DebugLoc dl = (MBBI != MBB.end()
- ? MBBI->getDebugLoc()
- : DebugLoc::getUnknownLoc());
-
- int FrameSize = MFI->getStackSize();
- if (FrameSize%4) {
- FrameSize = (FrameSize+3) & ~3;
- MFI->setStackSize(FrameSize);
- }
-
- if (!hasFP(MF)) {
- // So far we only support FP elimination on leaf functions
- assert(!MFI->hasCalls());
- adjustRegister(MBB, MBBI, dl, BF::SP, BF::P1, -FrameSize);
- return;
- }
-
- // emit a LINK instruction
- if (FrameSize <= 0x3ffff) {
- BuildMI(MBB, MBBI, dl, TII.get(BF::LINK)).addImm(FrameSize);
- return;
- }
-
- // Frame is too big, do a manual LINK:
- // [--SP] = RETS;
- // [--SP] = FP;
- // FP = SP;
- // P1 = -FrameSize;
- // SP = SP + P1;
- BuildMI(MBB, MBBI, dl, TII.get(BF::PUSH))
- .addReg(BF::RETS, RegState::Kill);
- BuildMI(MBB, MBBI, dl, TII.get(BF::PUSH))
- .addReg(BF::FP, RegState::Kill);
- BuildMI(MBB, MBBI, dl, TII.get(BF::MOVE), BF::FP)
- .addReg(BF::SP);
- loadConstant(MBB, MBBI, dl, BF::P1, -FrameSize);
- BuildMI(MBB, MBBI, dl, TII.get(BF::ADDpp), BF::SP)
- .addReg(BF::SP, RegState::Kill)
- .addReg(BF::P1, RegState::Kill);
-
-}
-
-void BlackfinRegisterInfo::emitEpilogue(MachineFunction &MF,
- MachineBasicBlock &MBB) const {
- MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- DebugLoc dl = MBBI->getDebugLoc();