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 NVPTXFrameLowering::NVPTXFrameLowering(NVPTXSubtarget &STI)
30 : TargetFrameLowering(TargetFrameLowering::StackGrowsUp, 8, 0),
31 is64bit(STI.is64Bit()) {}
33 bool NVPTXFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
35 void NVPTXFrameLowering::emitPrologue(MachineFunction &MF) const {
36 if (MF.getFrameInfo()->hasStackObjects()) {
37 MachineBasicBlock &MBB = MF.front();
38 // Insert "mov.u32 %SP, %Depot"
39 MachineBasicBlock::iterator MBBI = MBB.begin();
40 // This instruction really occurs before first instruction
41 // in the BB, so giving it no debug location.
42 DebugLoc dl = DebugLoc();
44 MachineRegisterInfo &MRI = MF.getRegInfo();
47 // cvta.local %SP, %SPL;
49 unsigned LocalReg = MRI.createVirtualRegister(&NVPTX::Int64RegsRegClass);
51 BuildMI(MBB, MBBI, dl,
52 MF.getTarget().getSubtargetImpl()->getInstrInfo()->get(
53 NVPTX::cvta_local_yes_64),
54 NVPTX::VRFrame).addReg(LocalReg);
56 MF.getTarget().getSubtargetImpl()->getInstrInfo()->get(
57 NVPTX::MOV_DEPOT_ADDR_64),
58 LocalReg).addImm(MF.getFunctionNumber());
60 unsigned LocalReg = MRI.createVirtualRegister(&NVPTX::Int32RegsRegClass);
62 BuildMI(MBB, MBBI, dl,
63 MF.getTarget().getSubtargetImpl()->getInstrInfo()->get(
64 NVPTX::cvta_local_yes),
65 NVPTX::VRFrame).addReg(LocalReg);
67 MF.getTarget().getSubtargetImpl()->getInstrInfo()->get(
68 NVPTX::MOV_DEPOT_ADDR),
69 LocalReg).addImm(MF.getFunctionNumber());
74 void NVPTXFrameLowering::emitEpilogue(MachineFunction &MF,
75 MachineBasicBlock &MBB) const {}
77 // This function eliminates ADJCALLSTACKDOWN,
78 // ADJCALLSTACKUP pseudo instructions
79 void NVPTXFrameLowering::eliminateCallFramePseudoInstr(
80 MachineFunction &MF, MachineBasicBlock &MBB,
81 MachineBasicBlock::iterator I) const {
82 // Simply discard ADJCALLSTACKDOWN,
83 // ADJCALLSTACKUP instructions.