+ explicit HexagonFrameLowering()
+ : TargetFrameLowering(StackGrowsDown, 8, 0, 1, true) {}
+
+ // All of the prolog/epilog functionality, including saving and restoring
+ // callee-saved registers is handled in emitPrologue. This is to have the
+ // logic for shrink-wrapping in one place.
+ void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const
+ override;
+ void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const
+ override {}
+ bool spillCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI, const std::vector<CalleeSavedInfo> &CSI,
+ const TargetRegisterInfo *TRI) const override {
+ return true;
+ }
+ bool restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator MI, const std::vector<CalleeSavedInfo> &CSI,
+ const TargetRegisterInfo *TRI) const override {
+ return true;
+ }
+
+ void eliminateCallFramePseudoInstr(MachineFunction &MF,
+ MachineBasicBlock &MBB, MachineBasicBlock::iterator I) const override;
+ void processFunctionBeforeFrameFinalized(MachineFunction &MF,
+ RegScavenger *RS = nullptr) const override;
+ void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
+ RegScavenger *RS) const override;
+
+ bool targetHandlesStackFrameRounding() const override {
+ return true;
+ }
+ int getFrameIndexReference(const MachineFunction &MF, int FI,
+ unsigned &FrameReg) const override;
+ bool hasFP(const MachineFunction &MF) const override;
+
+ const SpillSlot *getCalleeSavedSpillSlots(unsigned &NumEntries)
+ const override {
+ static const SpillSlot Offsets[] = {
+ { Hexagon::R17, -4 }, { Hexagon::R16, -8 }, { Hexagon::D8, -8 },
+ { Hexagon::R19, -12 }, { Hexagon::R18, -16 }, { Hexagon::D9, -16 },
+ { Hexagon::R21, -20 }, { Hexagon::R20, -24 }, { Hexagon::D10, -24 },
+ { Hexagon::R23, -28 }, { Hexagon::R22, -32 }, { Hexagon::D11, -32 },
+ { Hexagon::R25, -36 }, { Hexagon::R24, -40 }, { Hexagon::D12, -40 },
+ { Hexagon::R27, -44 }, { Hexagon::R26, -48 }, { Hexagon::D13, -48 }
+ };
+ NumEntries = array_lengthof(Offsets);
+ return Offsets;