llvm/lib/Target/VE/VEFrameLowering.h

   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 #include "llvm/Support/TypeSize.h"
  19
  20 namespace llvm {
  21
  22 class VESubtarget;
  23 class VEFrameLowering : public TargetFrameLowering {
  24 public:
  25   explicit VEFrameLowering(const VESubtarget &ST);
  26
  27   /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
  28   /// the function.
  29   void emitPrologue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  30   void emitEpilogue(MachineFunction &MF, MachineBasicBlock &MBB) const override;
  31   void emitPrologueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
  32                          MachineBasicBlock::iterator MBBI, uint64_t NumBytes,
  33                          bool RequireFPUpdate) const;
  34   void emitEpilogueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
  35                          MachineBasicBlock::iterator MBBI, uint64_t NumBytes,
  36                          bool RequireFPUpdate) const;
  37
  38   MachineBasicBlock::iterator
  39   eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
  40                                 MachineBasicBlock::iterator I) const override;
  41
  42   bool hasBP(const MachineFunction &MF) const;
  43   bool hasGOT(const MachineFunction &MF) const;
  44
  45   // VE reserves argument space always for call sites in the function
  46   // immediately on entry of the current function.
  47   bool hasReservedCallFrame(const MachineFunction &MF) const override {
  48     return true;
  49   }
  50   void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
  51                             RegScavenger *RS = nullptr) const override;
  52
  53   StackOffset getFrameIndexReference(const MachineFunction &MF, int FI,
  54                                      Register &FrameReg) const override;
  55
  56   const SpillSlot *
  57   getCalleeSavedSpillSlots(unsigned &NumEntries) const override {
  58     static const SpillSlot Offsets[] = {
  59         {VE::SX17, 40},  {VE::SX18, 48},  {VE::SX19, 56},  {VE::SX20, 64},
  60         {VE::SX21, 72},  {VE::SX22, 80},  {VE::SX23, 88},  {VE::SX24, 96},
  61         {VE::SX25, 104}, {VE::SX26, 112}, {VE::SX27, 120}, {VE::SX28, 128},
  62         {VE::SX29, 136}, {VE::SX30, 144}, {VE::SX31, 152}, {VE::SX32, 160},
  63         {VE::SX33, 168}};
  64     NumEntries = std::size(Offsets);
  65     return Offsets;
  66   }
  67
  68 protected:
  69   const VESubtarget &STI;
  70
  71   bool hasFPImpl(const MachineFunction &MF) const override;
  72
  73 private:
  74   // Returns true if MF is a leaf procedure.
  75   bool isLeafProc(MachineFunction &MF) const;
  76
  77   // Emits code for adjusting SP in function prologue/epilogue.
  78   void emitSPAdjustment(MachineFunction &MF, MachineBasicBlock &MBB,
  79                         MachineBasicBlock::iterator MBBI, int64_t NumBytes,
  80                         MaybeAlign MayAlign = MaybeAlign()) const;
  81
  82   // Emits code for extending SP in function prologue/epilogue.
  83   void emitSPExtend(MachineFunction &MF, MachineBasicBlock &MBB,
  84                     MachineBasicBlock::iterator MBBI) const;
  85 };
  86
  87 } // namespace llvm
  88
  89 #endif