1 //=======- NVPTXFrameLowering.cpp - NVPTX Frame Information ---*- C++ -*-=====//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the NVPTX implementation of TargetFrameLowering class.
12 //===----------------------------------------------------------------------===//
14 #include "NVPTXFrameLowering.h"
16 #include "NVPTXRegisterInfo.h"
17 #include "NVPTXSubtarget.h"
18 #include "NVPTXTargetMachine.h"
19 #include "llvm/ADT/BitVector.h"
20 #include "llvm/CodeGen/MachineFrameInfo.h"
21 #include "llvm/CodeGen/MachineFunction.h"
22 #include "llvm/CodeGen/MachineInstrBuilder.h"
23 #include "llvm/CodeGen/MachineRegisterInfo.h"
24 #include "llvm/MC/MachineLocation.h"
25 #include "llvm/Target/TargetInstrInfo.h"
29 bool NVPTXFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
31 void NVPTXFrameLowering::emitPrologue(MachineFunction &MF) const {
32 if (MF.getFrameInfo()->hasStackObjects()) {
33 MachineBasicBlock &MBB = MF.front();
34 // Insert "mov.u32 %SP, %Depot"
35 MachineBasicBlock::iterator MBBI = MBB.begin();
36 // This instruction really occurs before first instruction
37 // in the BB, so giving it no debug location.
38 DebugLoc dl = DebugLoc();
40 MachineRegisterInfo &MRI = MF.getRegInfo();
43 // cvta.local %SP, %SPL;
45 unsigned LocalReg = MRI.createVirtualRegister(&NVPTX::Int64RegsRegClass);
46 MachineInstr *MI = BuildMI(
47 MBB, MBBI, dl, tm.getInstrInfo()->get(NVPTX::cvta_local_yes_64),
48 NVPTX::VRFrame).addReg(LocalReg);
49 BuildMI(MBB, MI, dl, tm.getInstrInfo()->get(NVPTX::MOV_DEPOT_ADDR_64),
50 LocalReg).addImm(MF.getFunctionNumber());
52 unsigned LocalReg = MRI.createVirtualRegister(&NVPTX::Int32RegsRegClass);
53 MachineInstr *MI = BuildMI(
54 MBB, MBBI, dl, tm.getInstrInfo()->get(NVPTX::cvta_local_yes),
55 NVPTX::VRFrame).addReg(LocalReg);
56 BuildMI(MBB, MI, dl, tm.getInstrInfo()->get(NVPTX::MOV_DEPOT_ADDR),
57 LocalReg).addImm(MF.getFunctionNumber());
62 void NVPTXFrameLowering::emitEpilogue(MachineFunction &MF,
63 MachineBasicBlock &MBB) const {}
65 // This function eliminates ADJCALLSTACKDOWN,
66 // ADJCALLSTACKUP pseudo instructions
67 void NVPTXFrameLowering::eliminateCallFramePseudoInstr(
68 MachineFunction &MF, MachineBasicBlock &MBB,
69 MachineBasicBlock::iterator I) const {
70 // Simply discard ADJCALLSTACKDOWN,
71 // ADJCALLSTACKUP instructions.