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()
30 : TargetFrameLowering(TargetFrameLowering::StackGrowsUp, 8, 0) {}
32 bool NVPTXFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
34 void NVPTXFrameLowering::emitPrologue(MachineFunction &MF,
35 MachineBasicBlock &MBB) const {
36 if (MF.getFrameInfo()->hasStackObjects()) {
37 assert(&MF.front() == &MBB && "Shrink-wrapping not yet supported");
38 // Insert "mov.u32 %SP, %Depot"
39 MachineInstr *MI = MBB.begin();
40 MachineRegisterInfo &MR = MF.getRegInfo();
42 // This instruction really occurs before first instruction
43 // in the BB, so giving it no debug location.
44 DebugLoc dl = DebugLoc();
47 // cvta.local %SP, %SPL;
48 if (static_cast<const NVPTXTargetMachine &>(MF.getTarget()).is64Bit()) {
49 // Check if %SP is actually used
50 if (!MR.use_empty(NVPTX::VRFrame)) {
51 MI = BuildMI(MBB, MI, dl, MF.getSubtarget().getInstrInfo()->get(
52 NVPTX::cvta_local_yes_64),
54 .addReg(NVPTX::VRFrameLocal);
57 MF.getSubtarget().getInstrInfo()->get(NVPTX::MOV_DEPOT_ADDR_64),
59 .addImm(MF.getFunctionNumber());
61 // Check if %SP is actually used
62 if (!MR.use_empty(NVPTX::VRFrame)) {
63 MI = BuildMI(MBB, MI, dl, MF.getSubtarget().getInstrInfo()->get(
64 NVPTX::cvta_local_yes),
66 .addReg(NVPTX::VRFrameLocal);
69 MF.getSubtarget().getInstrInfo()->get(NVPTX::MOV_DEPOT_ADDR),
71 .addImm(MF.getFunctionNumber());
76 void NVPTXFrameLowering::emitEpilogue(MachineFunction &MF,
77 MachineBasicBlock &MBB) const {}
79 // This function eliminates ADJCALLSTACKDOWN,
80 // ADJCALLSTACKUP pseudo instructions
81 void NVPTXFrameLowering::eliminateCallFramePseudoInstr(
82 MachineFunction &MF, MachineBasicBlock &MBB,
83 MachineBasicBlock::iterator I) const {
84 // Simply discard ADJCALLSTACKDOWN,
85 // ADJCALLSTACKUP instructions.