//===----------------------------------------------------------------------===//
#include "MipsSEFrameLowering.h"
+#include "MCTargetDesc/MipsBaseInfo.h"
#include "MipsAnalyzeImmediate.h"
-#include "MipsSEInstrInfo.h"
#include "MipsMachineFunction.h"
-#include "MCTargetDesc/MipsBaseInfo.h"
-#include "llvm/Function.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/Target/TargetData.h"
-#include "llvm/Target/TargetOptions.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;
+
+static std::pair<unsigned, unsigned> getMFHiLoOpc(unsigned Src) {
+ if (Mips::ACC64RegClass.contains(Src))
+ return std::make_pair((unsigned)Mips::PseudoMFHI,
+ (unsigned)Mips::PseudoMFLO);
+
+ if (Mips::ACC64DSPRegClass.contains(Src))
+ return std::make_pair((unsigned)Mips::MFHI_DSP, (unsigned)Mips::MFLO_DSP);
+
+ if (Mips::ACC128RegClass.contains(Src))
+ return std::make_pair((unsigned)Mips::PseudoMFHI64,
+ (unsigned)Mips::PseudoMFLO64);
+
+ return std::make_pair(0, 0);
+}
+
+/// Helper class to expand pseudos.
+class ExpandPseudo {
+public:
+ ExpandPseudo(MachineFunction &MF);
+ bool expand();
+
+private:
+ bool expandInstr(MachineBasicBlock &MBB, Iter I);
+ void expandLoadCCond(MachineBasicBlock &MBB, Iter I);
+ void expandStoreCCond(MachineBasicBlock &MBB, Iter I);
+ void expandLoadACC(MachineBasicBlock &MBB, Iter I, unsigned RegSize);
+ void expandStoreACC(MachineBasicBlock &MBB, Iter I, unsigned MFHiOpc,
+ unsigned MFLoOpc, unsigned RegSize);
+ bool expandCopy(MachineBasicBlock &MBB, Iter I);
+ bool expandCopyACC(MachineBasicBlock &MBB, Iter I, unsigned MFHiOpc,
+ unsigned MFLoOpc);
+
+ MachineFunction &MF;
+ MachineRegisterInfo &MRI;
+};
+}
+
+ExpandPseudo::ExpandPseudo(MachineFunction &MF_)
+ : MF(MF_), MRI(MF.getRegInfo()) {}
+
+bool ExpandPseudo::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 ExpandPseudo::expandInstr(MachineBasicBlock &MBB, Iter I) {
+ switch(I->getOpcode()) {
+ case Mips::LOAD_CCOND_DSP:
+ expandLoadCCond(MBB, I);
+ break;
+ case Mips::STORE_CCOND_DSP:
+ expandStoreCCond(MBB, I);
+ break;
+ case Mips::LOAD_ACC64:
+ case Mips::LOAD_ACC64DSP:
+ expandLoadACC(MBB, I, 4);
+ break;
+ case Mips::LOAD_ACC128:
+ expandLoadACC(MBB, I, 8);
+ break;
+ case Mips::STORE_ACC64:
+ expandStoreACC(MBB, I, Mips::PseudoMFHI, Mips::PseudoMFLO, 4);
+ break;
+ case Mips::STORE_ACC64DSP:
+ expandStoreACC(MBB, I, Mips::MFHI_DSP, Mips::MFLO_DSP, 4);
+ break;
+ case Mips::STORE_ACC128:
+ expandStoreACC(MBB, I, Mips::PseudoMFHI64, Mips::PseudoMFLO64, 8);
+ break;
+ case TargetOpcode::COPY:
+ if (!expandCopy(MBB, I))
+ return false;
+ break;
+ default:
+ return false;
+ }
+
+ MBB.erase(I);
+ return true;
+}
+
+void ExpandPseudo::expandLoadCCond(MachineBasicBlock &MBB, Iter I) {
+ // load $vr, FI
+ // copy ccond, $vr
+
+ assert(I->getOperand(0).isReg() && I->getOperand(1).isFI());
+
+ const MipsSEInstrInfo &TII =
+ *static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RegInfo =
+ *static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+
+ const TargetRegisterClass *RC = RegInfo.intRegClass(4);
+ unsigned VR = MRI.createVirtualRegister(RC);
+ unsigned Dst = I->getOperand(0).getReg(), FI = I->getOperand(1).getIndex();
+
+ TII.loadRegFromStack(MBB, I, VR, FI, RC, &RegInfo, 0);
+ BuildMI(MBB, I, I->getDebugLoc(), TII.get(TargetOpcode::COPY), Dst)
+ .addReg(VR, RegState::Kill);
+}
+
+void ExpandPseudo::expandStoreCCond(MachineBasicBlock &MBB, Iter I) {
+ // copy $vr, ccond
+ // store $vr, FI
+
+ assert(I->getOperand(0).isReg() && I->getOperand(1).isFI());
+
+ const MipsSEInstrInfo &TII =
+ *static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RegInfo =
+ *static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+
+ const TargetRegisterClass *RC = RegInfo.intRegClass(4);
+ unsigned VR = MRI.createVirtualRegister(RC);
+ unsigned Src = I->getOperand(0).getReg(), FI = I->getOperand(1).getIndex();
+
+ BuildMI(MBB, I, I->getDebugLoc(), TII.get(TargetOpcode::COPY), VR)
+ .addReg(Src, getKillRegState(I->getOperand(0).isKill()));
+ TII.storeRegToStack(MBB, I, VR, true, FI, RC, &RegInfo, 0);
+}
+
+void ExpandPseudo::expandLoadACC(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 MipsSEInstrInfo &TII =
+ *static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RegInfo =
+ *static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+
+ 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 ExpandPseudo::expandStoreACC(MachineBasicBlock &MBB, Iter I,
+ unsigned MFHiOpc, unsigned MFLoOpc,
+ unsigned RegSize) {
+ // mflo $vr0, src
+ // store $vr0, FI
+ // mfhi $vr1, src
+ // store $vr1, FI + 4
+
+ assert(I->getOperand(0).isReg() && I->getOperand(1).isFI());
+
+ const MipsSEInstrInfo &TII =
+ *static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RegInfo =
+ *static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+
+ 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());
+ DebugLoc DL = I->getDebugLoc();
+
+ BuildMI(MBB, I, DL, TII.get(MFLoOpc), VR0).addReg(Src);
+ TII.storeRegToStack(MBB, I, VR0, true, FI, RC, &RegInfo, 0);
+ BuildMI(MBB, I, DL, TII.get(MFHiOpc), VR1).addReg(Src, SrcKill);
+ TII.storeRegToStack(MBB, I, VR1, true, FI, RC, &RegInfo, RegSize);
+}
+
+bool ExpandPseudo::expandCopy(MachineBasicBlock &MBB, Iter I) {
+ unsigned Src = I->getOperand(1).getReg();
+ std::pair<unsigned, unsigned> Opcodes = getMFHiLoOpc(Src);
+
+ if (!Opcodes.first)
+ return false;
+
+ return expandCopyACC(MBB, I, Opcodes.first, Opcodes.second);
+}
+
+bool ExpandPseudo::expandCopyACC(MachineBasicBlock &MBB, Iter I,
+ unsigned MFHiOpc, unsigned MFLoOpc) {
+ // mflo $vr0, src
+ // copy dst_lo, $vr0
+ // mfhi $vr1, src
+ // copy dst_hi, $vr1
+
+ const MipsSEInstrInfo &TII =
+ *static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RegInfo =
+ *static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+
+ unsigned Dst = I->getOperand(0).getReg(), Src = I->getOperand(1).getReg();
+ unsigned VRegSize = RegInfo.getMinimalPhysRegClass(Dst)->getSize() / 2;
+ const TargetRegisterClass *RC = RegInfo.intRegClass(VRegSize);
+ unsigned VR0 = MRI.createVirtualRegister(RC);
+ unsigned VR1 = MRI.createVirtualRegister(RC);
+ unsigned SrcKill = getKillRegState(I->getOperand(1).isKill());
+ unsigned DstLo = RegInfo.getSubReg(Dst, Mips::sub_lo);
+ unsigned DstHi = RegInfo.getSubReg(Dst, Mips::sub_hi);
+ DebugLoc DL = I->getDebugLoc();
+
+ BuildMI(MBB, I, DL, TII.get(MFLoOpc), VR0).addReg(Src);
+ BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), DstLo)
+ .addReg(VR0, RegState::Kill);
+ BuildMI(MBB, I, DL, TII.get(MFHiOpc), VR1).addReg(Src, SrcKill);
+ BuildMI(MBB, I, DL, TII.get(TargetOpcode::COPY), DstHi)
+ .addReg(VR1, RegState::Kill);
+ return true;
+}
+
+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();
- const MipsRegisterInfo *RegInfo =
- static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+ MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
+
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RegInfo =
+ *static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+
MachineBasicBlock::iterator MBBI = MBB.begin();
DebugLoc dl = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
if (StackSize == 0 && !MFI->adjustsStack()) return;
MachineModuleInfo &MMI = MF.getMMI();
- std::vector<MachineMove> &Moves = MMI.getFrameMoves();
+ const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
MachineLocation DstML, SrcML;
// Adjust stack.
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));
+ MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(AdjustSPLabel, -StackSize));
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
// 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));
+ unsigned Reg0 =
+ MRI->getDwarfRegNum(RegInfo.getSubReg(Reg, Mips::sub_lo), true);
+ unsigned Reg1 =
+ MRI->getDwarfRegNum(RegInfo.getSubReg(Reg, Mips::sub_hi), true);
if (!STI.isLittle())
- std::swap(SrcML0, SrcML1);
+ std::swap(Reg0, Reg1);
- Moves.push_back(MachineMove(CSLabel, DstML0, SrcML0));
- Moves.push_back(MachineMove(CSLabel, DstML1, SrcML1));
+ MMI.addFrameInst(
+ MCCFIInstruction::createOffset(CSLabel, Reg0, Offset));
+ MMI.addFrameInst(
+ MCCFIInstruction::createOffset(CSLabel, Reg1, Offset + 4));
} else {
- // Reg is either in CPURegs or FGR32.
- DstML = MachineLocation(MachineLocation::VirtualFP, Offset);
- SrcML = MachineLocation(Reg);
- Moves.push_back(MachineMove(CSLabel, DstML, SrcML));
+ // Reg is either in GPR32 or FGR32.
+ MMI.addFrameInst(MCCFIInstruction::createOffset(
+ CSLabel, MRI->getDwarfRegNum(Reg, 1), Offset));
}
}
}
+ if (MipsFI->callsEhReturn()) {
+ const TargetRegisterClass *RC = STI.isABI_N64() ?
+ &Mips::GPR64RegClass : &Mips::GPR32RegClass;
+
+ // 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));
+ unsigned Reg = MRI->getDwarfRegNum(ehDataReg(I), true);
+ MMI.addFrameInst(MCCFIInstruction::createOffset(CSLabel2, Reg, Offset));
+ }
+ }
+
// if framepointer enabled, set it to point to the stack pointer.
if (hasFP(MF)) {
// Insert instruction "move $fp, $sp" at this location.
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));
+ MMI.addFrameInst(MCCFIInstruction::createDefCfaRegister(
+ SetFPLabel, MRI->getDwarfRegNum(FP, true)));
}
}
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
MachineFrameInfo *MFI = MF.getFrameInfo();
+ MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
+
const MipsSEInstrInfo &TII =
*static_cast<const MipsSEInstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RegInfo =
+ *static_cast<const MipsRegisterInfo*>(MF.getTarget().getRegisterInfo());
+
DebugLoc dl = MBBI->getDebugLoc();
unsigned SP = STI.isABI_N64() ? Mips::SP_64 : Mips::SP;
unsigned FP = STI.isABI_N64() ? Mips::FP_64 : Mips::FP;
BuildMI(MBB, I, dl, TII.get(ADDu), SP).addReg(FP).addReg(ZERO);
}
+ if (MipsFI->callsEhReturn()) {
+ const TargetRegisterClass *RC = STI.isABI_N64() ?
+ &Mips::GPR64RegClass : &Mips::GPR32RegClass;
+
+ // 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();
// 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.
- return isInt<16>(MFI->getMaxCallFrameSize()) && !MFI->hasVarSizedObjects();
+ // 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 (ExpandPseudo(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::GPR64RegClass : &Mips::GPR32RegClass;
+ 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::GPR64RegClass : &Mips::GPR32RegClass;
+ 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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