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 90