void HexagonFrameLowering::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front();
MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineModuleInfo &MMI = MF.getMMI();
MachineBasicBlock::iterator MBBI = MBB.begin();
const HexagonRegisterInfo *QRI =
static_cast<const HexagonRegisterInfo *>(MF.getTarget().getRegisterInfo());
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
determineFrameLayout(MF);
- // Check if frame moves are needed for EH.
- bool needsFrameMoves = MMI.hasDebugInfo() ||
- !MF.getFunction()->needsUnwindTableEntry();
-
// Get the number of bytes to allocate from the FrameInfo.
int NumBytes = (int) MFI->getStackSize();
MO.setImm(MFI->getMaxCallFrameSize());
}
- std::vector<MachineMove> &Moves = MMI.getFrameMoves();
-
- if (needsFrameMoves) {
- // Advance CFA. DW_CFA_def_cfa
- unsigned FPReg = QRI->getFrameRegister();
- unsigned RAReg = QRI->getRARegister();
-
- MachineLocation Dst(MachineLocation::VirtualFP);
- MachineLocation Src(FPReg, -8);
- Moves.push_back(MachineMove(0, Dst, Src));
-
- // R31 = (R31 - #4)
- MachineLocation LRDst(RAReg, -4);
- MachineLocation LRSrc(RAReg);
- Moves.push_back(MachineMove(0, LRDst, LRSrc));
-
- // R30 = (R30 - #8)
- MachineLocation SPDst(FPReg, -8);
- MachineLocation SPSrc(FPReg);
- Moves.push_back(MachineMove(0, SPDst, SPSrc));
- }
-
//
// Only insert ALLOCFRAME if we need to.
//