1 //===-- VEFrameLowering.h - Define frame lowering for VE --*- 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 VE-specific bits of TargetFrameLowering class.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_VE_VEFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_VE_VEFRAMELOWERING_H
15 
16 #include "VE.h"
17 #include "llvm/CodeGen/TargetFrameLowering.h"
18 
19 namespace llvm {
20 
21 class VESubtarget;
22 class VEFrameLowering : public TargetFrameLowering {
23 public:
24   explicit VEFrameLowering(const VESubtarget &ST);
25 
26   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
27   /// the function.
28   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
29   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
30   void emitPrologueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
31                          MachineBasicBlock::iterator MBBI, int NumBytes,
32                          bool RequireFPUpdate) const;
33   void emitEpilogueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
34                          MachineBasicBlock::iterator MBBI, int NumBytes,
35                          bool RequireFPUpdate) const;
36 
37   MachineBasicBlock::iterator
38   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
39                                 MachineBasicBlock::iterator I) const override;
40 
41   bool hasReservedCallFrame(const MachineFunction &MF) const override;
42   bool hasFP(const MachineFunction &MF) const override;
43   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
44                             RegScavenger *RS = nullptr) const override;
45 
46   int getFrameIndexReference(const MachineFunction &MF, int FI,
47                              unsigned &FrameReg) const override;
48 
49   const SpillSlot *
50   getCalleeSavedSpillSlots(unsigned &NumEntries) const override {
51     static const SpillSlot Offsets[] = {
52         {VE::SX17, 40},  {VE::SX18, 48},  {VE::SX19, 56},  {VE::SX20, 64},
53         {VE::SX21, 72},  {VE::SX22, 80},  {VE::SX23, 88},  {VE::SX24, 96},
54         {VE::SX25, 104}, {VE::SX26, 112}, {VE::SX27, 120}, {VE::SX28, 128},
55         {VE::SX29, 136}, {VE::SX30, 144}, {VE::SX31, 152}, {VE::SX32, 160},
56         {VE::SX33, 168}};
57     NumEntries = array_lengthof(Offsets);
58     return Offsets;
59   }
60 
61   /// targetHandlesStackFrameRounding - Returns true if the target is
62   /// responsible for rounding up the stack frame (probably at emitPrologue
63   /// time).
64   bool targetHandlesStackFrameRounding() const override { return true; }
65 
66 private:
67   // Returns true if MF is a leaf procedure.
68   bool isLeafProc(MachineFunction &MF) const;
69 
70   // Emits code for adjusting SP in function prologue/epilogue.
71   void emitSPAdjustment(MachineFunction &MF, MachineBasicBlock &MBB,
72                         MachineBasicBlock::iterator MBBI, int NumBytes) const;
73 
74   // Emits code for extending SP in function prologue/epilogue.
75   void emitSPExtend(MachineFunction &MF, MachineBasicBlock &MBB,
76                     MachineBasicBlock::iterator MBBI, int NumBytes) const;
77 };
78 
79 } // namespace llvm
80 
81 #endif
82