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//=======- NVPTXFrameLowering.cpp - NVPTX Frame Information ---*- C++ -*-=====//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the NVPTX implementation of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
#include "NVPTXFrameLowering.h"
#include "NVPTX.h"
#include "NVPTXRegisterInfo.h"
#include "NVPTXSubtarget.h"
#include "NVPTXTargetMachine.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/Target/TargetInstrInfo.h"
using namespace llvm;
NVPTXFrameLowering::NVPTXFrameLowering(NVPTXSubtarget &STI)
: TargetFrameLowering(TargetFrameLowering::StackGrowsUp, 8, 0),
is64bit(STI.is64Bit()) {}
bool NVPTXFrameLowering::hasFP(const MachineFunction &MF) const { return true; }
void NVPTXFrameLowering::emitPrologue(MachineFunction &MF) const {
if (MF.getFrameInfo()->hasStackObjects()) {
MachineBasicBlock &MBB = MF.front();
// Insert "mov.u32 %SP, %Depot"
MachineBasicBlock::iterator MBBI = MBB.begin();
// This instruction really occurs before first instruction
// in the BB, so giving it no debug location.
DebugLoc dl = DebugLoc();
MachineRegisterInfo &MRI = MF.getRegInfo();
// mov %SPL, %depot;
// cvta.local %SP, %SPL;
if (is64bit) {
unsigned LocalReg = MRI.createVirtualRegister(&NVPTX::Int64RegsRegClass);
MachineInstr *MI =
BuildMI(MBB, MBBI, dl,
MF.getTarget().getInstrInfo()->get(NVPTX::cvta_local_yes_64),
NVPTX::VRFrame).addReg(LocalReg);
BuildMI(MBB, MI, dl,
MF.getTarget().getInstrInfo()->get(NVPTX::MOV_DEPOT_ADDR_64),
LocalReg).addImm(MF.getFunctionNumber());
} else {
unsigned LocalReg = MRI.createVirtualRegister(&NVPTX::Int32RegsRegClass);
MachineInstr *MI =
BuildMI(MBB, MBBI, dl,
MF.getTarget().getInstrInfo()->get(NVPTX::cvta_local_yes),
NVPTX::VRFrame).addReg(LocalReg);
BuildMI(MBB, MI, dl,
MF.getTarget().getInstrInfo()->get(NVPTX::MOV_DEPOT_ADDR),
LocalReg).addImm(MF.getFunctionNumber());
}
}
}
void NVPTXFrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {}
// This function eliminates ADJCALLSTACKDOWN,
// ADJCALLSTACKUP pseudo instructions
void NVPTXFrameLowering::eliminateCallFramePseudoInstr(
MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
// Simply discard ADJCALLSTACKDOWN,
// ADJCALLSTACKUP instructions.
MBB.erase(I);
}
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