return Reserved;
}
-// This function eliminate ADJCALLSTACKDOWN/ADJCALLSTACKUP pseudo instructions
-void MBlazeRegisterInfo::
-eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I) const {
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
-
- if (!TFI->hasReservedCallFrame(MF)) {
- // If we have a frame pointer, turn the adjcallstackup instruction into a
- // 'addi r1, r1, -<amt>' and the adjcallstackdown instruction into
- // 'addi r1, r1, <amt>'
- MachineInstr *Old = I;
- int Amount = Old->getOperand(0).getImm() + 4;
- if (Amount != 0) {
- // We need to keep the stack aligned properly. To do this, we round the
- // amount of space needed for the outgoing arguments up to the next
- // alignment boundary.
- unsigned Align = TFI->getStackAlignment();
- Amount = (Amount+Align-1)/Align*Align;
-
- MachineInstr *New;
- if (Old->getOpcode() == MBlaze::ADJCALLSTACKDOWN) {
- New = BuildMI(MF,Old->getDebugLoc(),TII.get(MBlaze::ADDIK),MBlaze::R1)
- .addReg(MBlaze::R1).addImm(-Amount);
- } else {
- assert(Old->getOpcode() == MBlaze::ADJCALLSTACKUP);
- New = BuildMI(MF,Old->getDebugLoc(),TII.get(MBlaze::ADDIK),MBlaze::R1)
- .addReg(MBlaze::R1).addImm(Amount);
- }
-
- // Replace the pseudo instruction with a new instruction...
- MBB.insert(I, New);
- }
- }
-
- // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
- MBB.erase(I);
-}
-
// FrameIndex represent objects inside a abstract stack.
// We must replace FrameIndex with an stack/frame pointer
// direct reference.