static void determineFrameLayout(MachineFunction &MF) { MachineFrameInfo *MFI = MF.getFrameInfo(); MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>(); // Replace the dummy '0' SPOffset by the negative offsets, as explained on // LowerFORMAL_ARGUMENTS. Leaving '0' for while is necessary to avoid // the approach done by calculateFrameObjectOffsets to the stack frame. MBlazeFI->adjustLoadArgsFI(MFI); MBlazeFI->adjustStoreVarArgsFI(MFI); // Get the number of bytes to allocate from the FrameInfo unsigned FrameSize = MFI->getStackSize(); DEBUG(dbgs() << "Original Frame Size: " << FrameSize << "\n" ); // Get the alignments provided by the target, and the maximum alignment // (if any) of the fixed frame objects. // unsigned MaxAlign = MFI->getMaxAlignment(); unsigned TargetAlign = MF.getTarget().getFrameLowering()->getStackAlignment(); unsigned AlignMask = TargetAlign - 1; // Make sure the frame is aligned. FrameSize = (FrameSize + AlignMask) & ~AlignMask; MFI->setStackSize(FrameSize); DEBUG(dbgs() << "Aligned Frame Size: " << FrameSize << "\n" ); }
void MBlazeFrameInfo::emitPrologue(MachineFunction &MF) const { MachineBasicBlock &MBB = MF.front(); MachineFrameInfo *MFI = MF.getFrameInfo(); const MBlazeInstrInfo &TII = *static_cast<const MBlazeInstrInfo*>(MF.getTarget().getInstrInfo()); MBlazeFunctionInfo *MBlazeFI = MF.getInfo<MBlazeFunctionInfo>(); MachineBasicBlock::iterator MBBI = MBB.begin(); DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc(); // Replace the dummy '0' SPOffset by the negative offsets, as explained on // LowerFORMAL_ARGUMENTS. Leaving '0' for while is necessary to avoid // the approach done by calculateFrameObjectOffsets to the stack frame. MBlazeFI->adjustLoadArgsFI(MFI); MBlazeFI->adjustStoreVarArgsFI(MFI); // Get the number of bytes to allocate from the FrameInfo. unsigned StackSize = MFI->getStackSize(); // No need to allocate space on the stack. if (StackSize == 0 && !MFI->adjustsStack()) return; int FPOffset = MBlazeFI->getFPStackOffset(); int RAOffset = MBlazeFI->getRAStackOffset(); // Adjust stack : addi R1, R1, -imm BuildMI(MBB, MBBI, DL, TII.get(MBlaze::ADDI), MBlaze::R1) .addReg(MBlaze::R1).addImm(-StackSize); // swi R15, R1, stack_loc if (MFI->adjustsStack()) { BuildMI(MBB, MBBI, DL, TII.get(MBlaze::SWI)) .addReg(MBlaze::R15).addReg(MBlaze::R1).addImm(RAOffset); } if (hasFP(MF)) { // swi R19, R1, stack_loc BuildMI(MBB, MBBI, DL, TII.get(MBlaze::SWI)) .addReg(MBlaze::R19).addReg(MBlaze::R1).addImm(FPOffset); // add R19, R1, R0 BuildMI(MBB, MBBI, DL, TII.get(MBlaze::ADD), MBlaze::R19) .addReg(MBlaze::R1).addReg(MBlaze::R0); } }