1 //===-- VEFrameLowering.h - Define frame lowering for VE --*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
9 // This class implements VE-specific bits of TargetFrameLowering class.
11 //===----------------------------------------------------------------------===//
13 #ifndef LLVM_LIB_TARGET_VE_VEFRAMELOWERING_H
14 #define LLVM_LIB_TARGET_VE_VEFRAMELOWERING_H
17 #include "llvm/CodeGen/TargetFrameLowering.h"
22 class VEFrameLowering : public TargetFrameLowering {
24 explicit VEFrameLowering(const VESubtarget &ST);
26 /// emitProlog/emitEpilog - These methods insert prolog and epilog code into
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, uint64_t NumBytes,
32 bool RequireFPUpdate) const;
33 void emitEpilogueInsns(MachineFunction &MF, MachineBasicBlock &MBB,
34 MachineBasicBlock::iterator MBBI, uint64_t NumBytes,
35 bool RequireFPUpdate) const;
37 MachineBasicBlock::iterator
38 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
39 MachineBasicBlock::iterator I) const override;
41 bool hasBP(const MachineFunction &MF) const;
42 bool hasFP(const MachineFunction &MF) const override;
43 // VE reserves argument space always for call sites in the function
44 // immediately on entry of the current function.
45 bool hasReservedCallFrame(const MachineFunction &MF) const override {
48 void determineCalleeSaves(MachineFunction &MF, BitVector &SavedRegs,
49 RegScavenger *RS = nullptr) const override;
51 int getFrameIndexReference(const MachineFunction &MF, int FI,
52 Register &FrameReg) const override;
55 getCalleeSavedSpillSlots(unsigned &NumEntries) const override {
56 static const SpillSlot Offsets[] = {
57 {VE::SX17, 40}, {VE::SX18, 48}, {VE::SX19, 56}, {VE::SX20, 64},
58 {VE::SX21, 72}, {VE::SX22, 80}, {VE::SX23, 88}, {VE::SX24, 96},
59 {VE::SX25, 104}, {VE::SX26, 112}, {VE::SX27, 120}, {VE::SX28, 128},
60 {VE::SX29, 136}, {VE::SX30, 144}, {VE::SX31, 152}, {VE::SX32, 160},
62 NumEntries = array_lengthof(Offsets);
67 const VESubtarget &STI;
70 // Returns true if MF is a leaf procedure.
71 bool isLeafProc(MachineFunction &MF) const;
73 // Emits code for adjusting SP in function prologue/epilogue.
74 void emitSPAdjustment(MachineFunction &MF, MachineBasicBlock &MBB,
75 MachineBasicBlock::iterator MBBI, int64_t NumBytes,
76 MaybeAlign MayAlign = MaybeAlign()) const;
78 // Emits code for extending SP in function prologue/epilogue.
79 void emitSPExtend(MachineFunction &MF, MachineBasicBlock &MBB,
80 MachineBasicBlock::iterator MBBI) const;