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7995e1a221
Summary: NVPTX target dos not use register-based frame information. Instead it relies on the artificial local_depot that is used instead of the frame and the data for variables must be emitted relatively to this local_depot. Reviewers: tra, jlebar, echristo Subscribers: jholewinski, aprantl, JDevlieghere, llvm-commits Differential Revision: https://reviews.llvm.org/D45963 llvm-svn: 338039
87 lines
3.2 KiB
C++
87 lines
3.2 KiB
C++
//=======- NVPTXFrameLowering.cpp - NVPTX Frame Information ---*- C++ -*-=====//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the NVPTX implementation of TargetFrameLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "NVPTXFrameLowering.h"
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#include "NVPTX.h"
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#include "NVPTXRegisterInfo.h"
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#include "NVPTXSubtarget.h"
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#include "NVPTXTargetMachine.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/TargetInstrInfo.h"
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#include "llvm/MC/MachineLocation.h"
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using namespace llvm;
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NVPTXFrameLowering::NVPTXFrameLowering()
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: TargetFrameLowering(TargetFrameLowering::StackGrowsUp, 8, 0) {}
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bool NVPTXFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
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void NVPTXFrameLowering::emitPrologue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {
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if (MF.getFrameInfo().hasStackObjects()) {
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assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
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MachineInstr *MI = &MBB.front();
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MachineRegisterInfo &MR = MF.getRegInfo();
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// This instruction really occurs before first instruction
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// in the BB, so giving it no debug location.
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DebugLoc dl = DebugLoc();
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// Emits
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// mov %SPL, %depot;
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// cvta.local %SP, %SPL;
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// for local address accesses in MF.
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bool Is64Bit =
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static_cast<const NVPTXTargetMachine &>(MF.getTarget()).is64Bit();
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unsigned CvtaLocalOpcode =
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(Is64Bit ? NVPTX::cvta_local_yes_64 : NVPTX::cvta_local_yes);
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unsigned MovDepotOpcode =
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(Is64Bit ? NVPTX::MOV_DEPOT_ADDR_64 : NVPTX::MOV_DEPOT_ADDR);
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if (!MR.use_empty(NVPTX::VRFrame)) {
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// If %SP is not used, do not bother emitting "cvta.local %SP, %SPL".
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MI = BuildMI(MBB, MI, dl,
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MF.getSubtarget().getInstrInfo()->get(CvtaLocalOpcode),
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NVPTX::VRFrame)
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.addReg(NVPTX::VRFrameLocal);
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}
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BuildMI(MBB, MI, dl, MF.getSubtarget().getInstrInfo()->get(MovDepotOpcode),
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NVPTX::VRFrameLocal)
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.addImm(MF.getFunctionNumber());
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}
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}
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int NVPTXFrameLowering::getFrameIndexReference(const MachineFunction &MF,
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int FI,
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unsigned &FrameReg) const {
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const MachineFrameInfo &MFI = MF.getFrameInfo();
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FrameReg = NVPTX::VRDepot;
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return MFI.getObjectOffset(FI) - getOffsetOfLocalArea();
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}
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void NVPTXFrameLowering::emitEpilogue(MachineFunction &MF,
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MachineBasicBlock &MBB) const {}
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// This function eliminates ADJCALLSTACKDOWN,
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// ADJCALLSTACKUP pseudo instructions
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MachineBasicBlock::iterator NVPTXFrameLowering::eliminateCallFramePseudoInstr(
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MachineFunction &MF, MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I) const {
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// Simply discard ADJCALLSTACKDOWN,
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// ADJCALLSTACKUP instructions.
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return MBB.erase(I);
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}
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