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llvm-project/llvm/lib/Target/Mips/MipsSEFrameLowering.cpp

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//===-- MipsSEFrameLowering.cpp - Mips32/64 Frame Information -------------===//
//
// 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 Mips32/64 implementation of TargetFrameLowering class.
//
//===----------------------------------------------------------------------===//
#include "MipsSEFrameLowering.h"
#include "MCTargetDesc/MipsBaseInfo.h"
#include "MipsAnalyzeImmediate.h"
#include "MipsMachineFunction.h"
#include "MipsSEInstrInfo.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
namespace {
typedef MachineBasicBlock::iterator Iter;
/// Helper class to expand accumulator pseudos.
class ExpandACCPseudo {
public:
ExpandACCPseudo(MachineFunction &MF);
bool expand();
private:
bool expandInstr(MachineBasicBlock &MBB, Iter I);
void expandLoad(MachineBasicBlock &MBB, Iter I, unsigned RegSize);
void expandStore(MachineBasicBlock &MBB, Iter I, unsigned RegSize);
void expandCopy(MachineBasicBlock &MBB, Iter I, unsigned RegSize);
MachineFunction &MF;
const MipsSEInstrInfo &TII;
const MipsRegisterInfo &RegInfo;
MachineRegisterInfo &MRI;
};
}
ExpandACCPseudo::ExpandACCPseudo(MachineFunction &MF_)
: MF(MF_),
TII(*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo())),
RegInfo(TII.getRegisterInfo()), MRI(MF.getRegInfo()) {}
bool ExpandACCPseudo::expand() {
bool Expanded = false;
for (MachineFunction::iterator BB = MF.begin(), BBEnd = MF.end();
BB != BBEnd; ++BB)
for (Iter I = BB->begin(), End = BB->end(); I != End;)
Expanded |= expandInstr(*BB, I++);
return Expanded;
}
bool ExpandACCPseudo::expandInstr(MachineBasicBlock &MBB, Iter I) {
switch(I->getOpcode()) {
case Mips::LOAD_AC64:
case Mips::LOAD_AC64_P8:
case Mips::LOAD_AC_DSP:
case Mips::LOAD_AC_DSP_P8:
expandLoad(MBB, I, 4);
break;
case Mips::LOAD_AC128:
case Mips::LOAD_AC128_P8:
expandLoad(MBB, I, 8);
break;
case Mips::STORE_AC64:
case Mips::STORE_AC64_P8:
case Mips::STORE_AC_DSP:
case Mips::STORE_AC_DSP_P8:
expandStore(MBB, I, 4);
break;
case Mips::STORE_AC128:
case Mips::STORE_AC128_P8:
expandStore(MBB, I, 8);
break;
case Mips::COPY_AC64:
case Mips::COPY_AC_DSP:
expandCopy(MBB, I, 4);
break;
case Mips::COPY_AC128:
expandCopy(MBB, I, 8);
break;
default:
return false;
}
MBB.erase(I);
return true;
}
void ExpandACCPseudo::expandLoad(MachineBasicBlock &MBB, Iter I,
unsigned RegSize) {
// load $vr0, FI
// copy lo, $vr0
// load $vr1, FI + 4
// copy hi, $vr1
assert(I->getOperand(0).isReg() && I->getOperand(1).isFI());
const TargetRegisterClass *RC = RegInfo.intRegClass(RegSize);
unsigned VR0 = MRI.createVirtualRegister(RC);
unsigned VR1 = MRI.createVirtualRegister(RC);
unsigned Dst = I->getOperand(0).getReg(), FI = I->getOperand(1).getIndex();
unsigned Lo = RegInfo.getSubReg(Dst, Mips::sub_lo);
unsigned Hi = RegInfo.getSubReg(Dst, Mips::sub_hi);
DebugLoc DL = I->getDebugLoc();
const MCInstrDesc &Desc = TII.get(TargetOpcode::COPY);
TII.loadRegFromStack(MBB, I, VR0, FI, RC, &RegInfo, 0);
BuildMI(MBB, I, DL, Desc, Lo).addReg(VR0, RegState::Kill);
TII.loadRegFromStack(MBB, I, VR1, FI, RC, &RegInfo, RegSize);
BuildMI(MBB, I, DL, Desc, Hi).addReg(VR1, RegState::Kill);
}
void ExpandACCPseudo::expandStore(MachineBasicBlock &MBB, Iter I,
unsigned RegSize) {
// copy $vr0, lo
// store $vr0, FI
// copy $vr1, hi
// store $vr1, FI + 4
assert(I->getOperand(0).isReg() && I->getOperand(1).isFI());
const TargetRegisterClass *RC = RegInfo.intRegClass(RegSize);
unsigned VR0 = MRI.createVirtualRegister(RC);
unsigned VR1 = MRI.createVirtualRegister(RC);
unsigned Src = I->getOperand(0).getReg(), FI = I->getOperand(1).getIndex();
unsigned SrcKill = getKillRegState(I->getOperand(0).isKill());
unsigned Lo = RegInfo.getSubReg(Src, Mips::sub_lo);
unsigned Hi = RegInfo.getSubReg(Src, Mips::sub_hi);
DebugLoc DL = I->getDebugLoc();
BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), VR0).addReg(Lo, SrcKill);
TII.storeRegToStack(MBB, I, VR0, true, FI, RC, &RegInfo, 0);
BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), VR1).addReg(Hi, SrcKill);
TII.storeRegToStack(MBB, I, VR1, true, FI, RC, &RegInfo, RegSize);
}
void ExpandACCPseudo::expandCopy(MachineBasicBlock &MBB, Iter I,
unsigned RegSize) {
// copy $vr0, src_lo
// copy dst_lo, $vr0
// copy $vr1, src_hi
// copy dst_hi, $vr1
const TargetRegisterClass *RC = RegInfo.intRegClass(RegSize);
unsigned VR0 = MRI.createVirtualRegister(RC);
unsigned VR1 = MRI.createVirtualRegister(RC);
unsigned Dst = I->getOperand(0).getReg(), Src = I->getOperand(1).getReg();
unsigned SrcKill = getKillRegState(I->getOperand(1).isKill());
unsigned DstLo = RegInfo.getSubReg(Dst, Mips::sub_lo);
unsigned DstHi = RegInfo.getSubReg(Dst, Mips::sub_hi);
unsigned SrcLo = RegInfo.getSubReg(Src, Mips::sub_lo);
unsigned SrcHi = RegInfo.getSubReg(Src, Mips::sub_hi);
DebugLoc DL = I->getDebugLoc();
BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), VR0).addReg(SrcLo, SrcKill);
BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), DstLo)
.addReg(VR0, RegState::Kill);
BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), VR1).addReg(SrcHi, SrcKill);
BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), DstHi)
.addReg(VR1, RegState::Kill);
}
unsigned MipsSEFrameLowering::ehDataReg(unsigned I) const {
static const unsigned EhDataReg[] = {
Mips::A0, Mips::A1, Mips::A2, Mips::A3
};
static const unsigned EhDataReg64[] = {
Mips::A0_64, Mips::A1_64, Mips::A2_64, Mips::A3_64
};
return STI.isABI_N64() ? EhDataReg64[I] : EhDataReg[I];
}
void MipsSEFrameLowering::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
const MipsRegisterInfo *RegInfo =
static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
unsigned FP = STI.isABI_N64() ? Mips::FP_64 : Mips::FP;
unsigned ZERO = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO;
unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
// First, compute final stack size.
uint64_t StackSize = MFI->getStackSize();
// No need to allocate space on the stack.
if (StackSize == 0 && !MFI->adjustsStack()) return;
MachineModuleInfo &MMI = MF.getMMI();
std::vector<MachineMove> &Moves = MMI.getFrameMoves();
MachineLocation DstML, SrcML;
// Adjust stack.
TII.adjustStackPtr(SP, -StackSize, MBB, MBBI);
// emit ".cfi_def_cfa_offset StackSize"
MCSymbol *AdjustSPLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, dl,
TII.get(TargetOpcode::PROLOG_LABEL)).addSym(AdjustSPLabel);
DstML = MachineLocation(MachineLocation::VirtualFP);
SrcML = MachineLocation(MachineLocation::VirtualFP, -StackSize);
Moves.push_back(MachineMove(AdjustSPLabel, DstML, SrcML));
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
if (CSI.size()) {
// Find the instruction past the last instruction that saves a callee-saved
// register to the stack.
for (unsigned i = 0; i < CSI.size(); ++i)
++MBBI;
// Iterate over list of callee-saved registers and emit .cfi_offset
// directives.
MCSymbol *CSLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, dl,
TII.get(TargetOpcode::PROLOG_LABEL)).addSym(CSLabel);
for (std::vector<CalleeSavedInfo>::const_iterator I = CSI.begin(),
E = CSI.end(); I != E; ++I) {
int64_t Offset = MFI->getObjectOffset(I->getFrameIdx());
unsigned Reg = I->getReg();
// If Reg is a double precision register, emit two cfa_offsets,
// one for each of the paired single precision registers.
if (Mips::AFGR64RegClass.contains(Reg)) {
MachineLocation DstML0(MachineLocation::VirtualFP, Offset);
MachineLocation DstML1(MachineLocation::VirtualFP, Offset + 4);
MachineLocation SrcML0(RegInfo->getSubReg(Reg, Mips::sub_fpeven));
MachineLocation SrcML1(RegInfo->getSubReg(Reg, Mips::sub_fpodd));
if (!STI.isLittle())
std::swap(SrcML0, SrcML1);
Moves.push_back(MachineMove(CSLabel, DstML0, SrcML0));
Moves.push_back(MachineMove(CSLabel, DstML1, SrcML1));
} else {
// Reg is either in CPURegs or FGR32.
DstML = MachineLocation(MachineLocation::VirtualFP, Offset);
SrcML = MachineLocation(Reg);
Moves.push_back(MachineMove(CSLabel, DstML, SrcML));
}
}
}
if (MipsFI->callsEhReturn()) {
const TargetRegisterClass *RC = STI.isABI_N64() ?
&Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass;
// Insert instructions that spill eh data registers.
for (int I = 0; I < 4; ++I) {
if (!MBB.isLiveIn(ehDataReg(I)))
MBB.addLiveIn(ehDataReg(I));
TII.storeRegToStackSlot(MBB, MBBI, ehDataReg(I), false,
MipsFI->getEhDataRegFI(I), RC, RegInfo);
}
// Emit .cfi_offset directives for eh data registers.
MCSymbol *CSLabel2 = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, dl,
TII.get(TargetOpcode::PROLOG_LABEL)).addSym(CSLabel2);
for (int I = 0; I < 4; ++I) {
int64_t Offset = MFI->getObjectOffset(MipsFI->getEhDataRegFI(I));
DstML = MachineLocation(MachineLocation::VirtualFP, Offset);
SrcML = MachineLocation(ehDataReg(I));
Moves.push_back(MachineMove(CSLabel2, DstML, SrcML));
}
}
// if framepointer enabled, set it to point to the stack pointer.
if (hasFP(MF)) {
// Insert instruction "move $fp, $sp" at this location.
BuildMI(MBB, MBBI, dl, TII.get(ADDu), FP).addReg(SP).addReg(ZERO);
// emit ".cfi_def_cfa_register $fp"
MCSymbol *SetFPLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, dl,
TII.get(TargetOpcode::PROLOG_LABEL)).addSym(SetFPLabel);
DstML = MachineLocation(FP);
SrcML = MachineLocation(MachineLocation::VirtualFP);
Moves.push_back(MachineMove(SetFPLabel, DstML, SrcML));
}
}
void MipsSEFrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
const MipsRegisterInfo *RegInfo =
static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
DebugLoc dl = MBBI->getDebugLoc();
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
unsigned FP = STI.isABI_N64() ? Mips::FP_64 : Mips::FP;
unsigned ZERO = STI.isABI_N64() ? Mips::ZERO_64 : Mips::ZERO;
unsigned ADDu = STI.isABI_N64() ? Mips::DADDu : Mips::ADDu;
// if framepointer enabled, restore the stack pointer.
if (hasFP(MF)) {
// Find the first instruction that restores a callee-saved register.
MachineBasicBlock::iterator I = MBBI;
for (unsigned i = 0; i < MFI->getCalleeSavedInfo().size(); ++i)
--I;
// Insert instruction "move $sp, $fp" at this location.
BuildMI(MBB, I, dl, TII.get(ADDu), SP).addReg(FP).addReg(ZERO);
}
if (MipsFI->callsEhReturn()) {
const TargetRegisterClass *RC = STI.isABI_N64() ?
&Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass;
// Find first instruction that restores a callee-saved register.
MachineBasicBlock::iterator I = MBBI;
for (unsigned i = 0; i < MFI->getCalleeSavedInfo().size(); ++i)
--I;
// Insert instructions that restore eh data registers.
for (int J = 0; J < 4; ++J) {
TII.loadRegFromStackSlot(MBB, I, ehDataReg(J), MipsFI->getEhDataRegFI(J),
RC, RegInfo);
}
}
// Get the number of bytes from FrameInfo
uint64_t StackSize = MFI->getStackSize();
if (!StackSize)
return;
// Adjust stack.
TII.adjustStackPtr(SP, StackSize, MBB, MBBI);
}
bool MipsSEFrameLowering::
spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI,
const TargetRegisterInfo *TRI) const {
MachineFunction *MF = MBB.getParent();
MachineBasicBlock *EntryBlock = MF->begin();
const TargetInstrInfo &TII = *MF->getTarget().getInstrInfo();
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
// Add the callee-saved register as live-in. Do not add if the register is
// RA and return address is taken, because it has already been added in
// method MipsTargetLowering::LowerRETURNADDR.
// It's killed at the spill, unless the register is RA and return address
// is taken.
unsigned Reg = CSI[i].getReg();
bool IsRAAndRetAddrIsTaken = (Reg == Mips::RA || Reg == Mips::RA_64)
&& MF->getFrameInfo()->isReturnAddressTaken();
if (!IsRAAndRetAddrIsTaken)
EntryBlock->addLiveIn(Reg);
// Insert the spill to the stack frame.
bool IsKill = !IsRAAndRetAddrIsTaken;
const TargetRegisterClass *RC = TRI->getMinimalPhysRegClass(Reg);
TII.storeRegToStackSlot(*EntryBlock, MI, Reg, IsKill,
CSI[i].getFrameIdx(), RC, TRI);
}
return true;
}
bool
MipsSEFrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
// Reserve call frame if the size of the maximum call frame fits into 16-bit
// immediate field and there are no variable sized objects on the stack.
// Make sure the second register scavenger spill slot can be accessed with one
// instruction.
return isInt<16>(MFI->getMaxCallFrameSize() + getStackAlignment()) &&
!MFI->hasVarSizedObjects();
}
// Eliminate ADJCALLSTACKDOWN, ADJCALLSTACKUP pseudo instructions
void MipsSEFrameLowering::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
if (!hasReservedCallFrame(MF)) {
int64_t Amount = I->getOperand(0).getImm();
if (I->getOpcode() == Mips::ADJCALLSTACKDOWN)
Amount = -Amount;
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
TII.adjustStackPtr(SP, Amount, MBB, I);
}
MBB.erase(I);
}
void MipsSEFrameLowering::
processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
MachineRegisterInfo &MRI = MF.getRegInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
unsigned FP = STI.isABI_N64() ? Mips::FP_64 : Mips::FP;
// Mark $fp as used if function has dedicated frame pointer.
if (hasFP(MF))
MRI.setPhysRegUsed(FP);
// Create spill slots for eh data registers if function calls eh_return.
if (MipsFI->callsEhReturn())
MipsFI->createEhDataRegsFI();
// Expand pseudo instructions which load, store or copy accumulators.
// Add an emergency spill slot if a pseudo was expanded.
if (ExpandACCPseudo(MF).expand()) {
// The spill slot should be half the size of the accumulator. If target is
// mips64, it should be 64-bit, otherwise it should be 32-bt.
const TargetRegisterClass *RC = STI.hasMips64() ?
&Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass;
int FI = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
RC->getAlignment(), false);
RS->addScavengingFrameIndex(FI);
}
// Set scavenging frame index if necessary.
uint64_t MaxSPOffset = MF.getInfo<MipsFunctionInfo>()->getIncomingArgSize() +
estimateStackSize(MF);
if (isInt<16>(MaxSPOffset))
return;
const TargetRegisterClass *RC = STI.isABI_N64() ?
&Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass;
int FI = MF.getFrameInfo()->CreateStackObject(RC->getSize(),
RC->getAlignment(), false);
RS->addScavengingFrameIndex(FI);
}
const MipsFrameLowering *
llvm::createMipsSEFrameLowering(const MipsSubtarget &ST) {
return new MipsSEFrameLowering(ST);
}
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