102 lines · cpp
1//=======- NVPTXFrameLowering.cpp - NVPTX Frame Information ---*- 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-exception6//7//===----------------------------------------------------------------------===//8//9// This file contains the NVPTX implementation of TargetFrameLowering class.10//11//===----------------------------------------------------------------------===//12 13#include "NVPTXFrameLowering.h"14#include "NVPTX.h"15#include "NVPTXRegisterInfo.h"16#include "NVPTXSubtarget.h"17#include "NVPTXTargetMachine.h"18#include "llvm/CodeGen/MachineFrameInfo.h"19#include "llvm/CodeGen/MachineFunction.h"20#include "llvm/CodeGen/MachineInstrBuilder.h"21#include "llvm/CodeGen/MachineRegisterInfo.h"22#include "llvm/CodeGen/TargetInstrInfo.h"23 24using namespace llvm;25 26NVPTXFrameLowering::NVPTXFrameLowering()27 : TargetFrameLowering(TargetFrameLowering::StackGrowsUp, Align(8), 0) {}28 29bool NVPTXFrameLowering::hasFPImpl(const MachineFunction &MF) const {30 return true;31}32 33void NVPTXFrameLowering::emitPrologue(MachineFunction &MF,34 MachineBasicBlock &MBB) const {35 if (MF.getFrameInfo().hasStackObjects()) {36 assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");37 MachineBasicBlock::iterator MBBI = MBB.begin();38 MachineRegisterInfo &MR = MF.getRegInfo();39 40 const NVPTXRegisterInfo *NRI =41 MF.getSubtarget<NVPTXSubtarget>().getRegisterInfo();42 43 // This instruction really occurs before first instruction44 // in the BB, so giving it no debug location.45 DebugLoc dl = DebugLoc();46 47 // Emits48 // mov %SPL, %depot;49 // cvta.local %SP, %SPL;50 // for local address accesses in MF.51 bool Is64Bit =52 static_cast<const NVPTXTargetMachine &>(MF.getTarget()).is64Bit();53 unsigned CvtaLocalOpcode =54 (Is64Bit ? NVPTX::cvta_local_64 : NVPTX::cvta_local);55 unsigned MovDepotOpcode =56 (Is64Bit ? NVPTX::MOV_DEPOT_ADDR_64 : NVPTX::MOV_DEPOT_ADDR);57 if (!MR.use_empty(NRI->getFrameRegister(MF))) {58 // If %SP is not used, do not bother emitting "cvta.local %SP, %SPL".59 MBBI = BuildMI(MBB, MBBI, dl,60 MF.getSubtarget().getInstrInfo()->get(CvtaLocalOpcode),61 NRI->getFrameRegister(MF))62 .addReg(NRI->getFrameLocalRegister(MF));63 }64 if (!MR.use_empty(NRI->getFrameLocalRegister(MF))) {65 BuildMI(MBB, MBBI, dl,66 MF.getSubtarget().getInstrInfo()->get(MovDepotOpcode),67 NRI->getFrameLocalRegister(MF))68 .addImm(MF.getFunctionNumber());69 }70 }71}72 73StackOffset74NVPTXFrameLowering::getFrameIndexReference(const MachineFunction &MF, int FI,75 Register &FrameReg) const {76 const MachineFrameInfo &MFI = MF.getFrameInfo();77 FrameReg = NVPTX::VRDepot;78 return StackOffset::getFixed(MFI.getObjectOffset(FI) -79 getOffsetOfLocalArea());80}81 82void NVPTXFrameLowering::emitEpilogue(MachineFunction &MF,83 MachineBasicBlock &MBB) const {}84 85// This function eliminates ADJCALLSTACKDOWN,86// ADJCALLSTACKUP pseudo instructions87MachineBasicBlock::iterator NVPTXFrameLowering::eliminateCallFramePseudoInstr(88 MachineFunction &MF, MachineBasicBlock &MBB,89 MachineBasicBlock::iterator I) const {90 // Simply discard ADJCALLSTACKDOWN,91 // ADJCALLSTACKUP instructions.92 return MBB.erase(I);93}94 95TargetFrameLowering::DwarfFrameBase96NVPTXFrameLowering::getDwarfFrameBase(const MachineFunction &MF) const {97 DwarfFrameBase FrameBase;98 FrameBase.Kind = DwarfFrameBase::CFA;99 FrameBase.Location.Offset = 0;100 return FrameBase;101}102