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/CodeGen/MachineFrameInfo.h"
20 #include "llvm/CodeGen/MachineFunction.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/CodeGen/MachineRegisterInfo.h"
23 #include "llvm/MC/MachineLocation.h"
24 #include "llvm/Target/TargetInstrInfo.h"
28 NVPTXFrameLowering::NVPTXFrameLowering()
29 : TargetFrameLowering(TargetFrameLowering::StackGrowsUp, 8, 0) {}
31 bool NVPTXFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
33 void NVPTXFrameLowering::emitPrologue(MachineFunction &MF,
34 MachineBasicBlock &MBB) const {
35 if (MF.getFrameInfo()->hasStackObjects()) {
36 assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
37 MachineInstr *MI = &MBB.front();
38 MachineRegisterInfo &MR = MF.getRegInfo();
40 // This instruction really occurs before first instruction
41 // in the BB, so giving it no debug location.
42 DebugLoc dl = DebugLoc();
46 // cvta.local %SP, %SPL;
47 // for local address accesses in MF.
49 static_cast<const NVPTXTargetMachine &>(MF.getTarget()).is64Bit();
50 unsigned CvtaLocalOpcode =
51 (Is64Bit ? NVPTX::cvta_local_yes_64 : NVPTX::cvta_local_yes);
52 unsigned MovDepotOpcode =
53 (Is64Bit ? NVPTX::MOV_DEPOT_ADDR_64 : NVPTX::MOV_DEPOT_ADDR);
54 if (!MR.use_empty(NVPTX::VRFrame)) {
55 // If %SP is not used, do not bother emitting "cvta.local %SP, %SPL".
56 MI = BuildMI(MBB, MI, dl,
57 MF.getSubtarget().getInstrInfo()->get(CvtaLocalOpcode),
59 .addReg(NVPTX::VRFrameLocal);
61 BuildMI(MBB, MI, dl, MF.getSubtarget().getInstrInfo()->get(MovDepotOpcode),
63 .addImm(MF.getFunctionNumber());
67 void NVPTXFrameLowering::emitEpilogue(MachineFunction &MF,
68 MachineBasicBlock &MBB) const {}
70 // This function eliminates ADJCALLSTACKDOWN,
71 // ADJCALLSTACKUP pseudo instructions
72 MachineBasicBlock::iterator NVPTXFrameLowering::eliminateCallFramePseudoInstr(
73 MachineFunction &MF, MachineBasicBlock &MBB,
74 MachineBasicBlock::iterator I) const {
75 // Simply discard ADJCALLSTACKDOWN,
76 // ADJCALLSTACKUP instructions.