-void SparcRegisterInfo::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front();
- MachineFrameInfo *MFI = MF.getFrameInfo();
-
- // Get the number of bytes to allocate from the FrameInfo
- int NumBytes = (int) MFI->getStackSize();
-
- // Emit the correct save instruction based on the number of bytes in
- // the frame. Minimum stack frame size according to V8 ABI is:
- // 16 words for register window spill
- // 1 word for address of returned aggregate-value
- // + 6 words for passing parameters on the stack
- // ----------
- // 23 words * 4 bytes per word = 92 bytes
- NumBytes += 92;
- // Round up to next doubleword boundary -- a double-word boundary
- // is required by the ABI.
- NumBytes = (NumBytes + 7) & ~7;
- NumBytes = -NumBytes;
-
- if (NumBytes >= -4096) {
- BuildMI(MBB, MBB.begin(), TII.get(SP::SAVEri),
- SP::O6).addImm(NumBytes).addReg(SP::O6);
- } else {
- MachineBasicBlock::iterator InsertPt = MBB.begin();
- // Emit this the hard way. This clobbers G1 which we always know is
- // available here.
- unsigned OffHi = (unsigned)NumBytes >> 10U;
- BuildMI(MBB, InsertPt, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
- // Emit G1 = G1 + I6
- BuildMI(MBB, InsertPt, TII.get(SP::ORri), SP::G1)
- .addReg(SP::G1).addImm(NumBytes & ((1 << 10)-1));
- BuildMI(MBB, InsertPt, TII.get(SP::SAVErr), SP::O6)
- .addReg(SP::O6).addReg(SP::G1);
- }
-}
-
-void SparcRegisterInfo::emitEpilogue(MachineFunction &MF,
- MachineBasicBlock &MBB) const {
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- assert(MBBI->getOpcode() == SP::RETL &&
- "Can only put epilog before 'retl' instruction!");
- BuildMI(MBB, MBBI, TII.get(SP::RESTORErr), SP::G0).addReg(SP::G0)
- .addReg(SP::G0);
-}
-