1 //=- LoongArchFrameLowering.h - TargetFrameLowering for LoongArch -*- C++ -*--//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This class implements LoongArch-specific bits of TargetFrameLowering class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
15 
16 #include "llvm/CodeGen/TargetFrameLowering.h"
17 
18 namespace llvm {
19 class LoongArchSubtarget;
20 
21 class LoongArchFrameLowering : public TargetFrameLowering {
22   const LoongArchSubtarget &STI;
23 
24 public:
25   explicit LoongArchFrameLowering(const LoongArchSubtarget &STI)
26       : TargetFrameLowering(StackGrowsDown,
27                             /*StackAlignment=*/Align(16),
28                             /*LocalAreaOffset=*/0),
29         STI(STI) {}
30 
31   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
32   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
33 
34   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
35                             RegScavenger *RS) const override;
36 
37   MachineBasicBlock::iterator
38   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
39                                 MachineBasicBlock::iterator MI) const override {
40     return MBB.erase(MI);
41   }
42 
43   StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
44                                      Register &FrameReg) const override;
45 
46   bool hasFP(const MachineFunction &MF) const override;
47   bool hasBP(const MachineFunction &MF) const;
48 
49 private:
50   void determineFrameLayout(MachineFunction &MF) const;
51   void adjustReg(MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI,
52                  const DebugLoc &DL, Register DestReg, Register SrcReg,
53                  int64_t Val, MachineInstr::MIFlag Flag) const;
54 };
55 } // end namespace llvm
56 #endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHFRAMELOWERING_H
57