#include "MCTargetDesc/MipsBaseInfo.h"
#include "Mips16InstrInfo.h"
#include "MipsInstrInfo.h"
+#include "MipsRegisterInfo.h"
+#include "MipsSubtarget.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
using namespace llvm;
+Mips16FrameLowering::Mips16FrameLowering(const MipsSubtarget &STI)
+ : MipsFrameLowering(STI, STI.stackAlignment()) {}
+
void Mips16FrameLowering::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front();
MachineFrameInfo *MFI = MF.getFrameInfo();
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.
TII.makeFrame(Mips::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));
-
- MCSymbol *CSLabel = MMI.getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, dl,
- TII.get(TargetOpcode::PROLOG_LABEL)).addSym(CSLabel);
- DstML = MachineLocation(MachineLocation::VirtualFP, -8);
- SrcML = MachineLocation(Mips::S1);
- Moves.push_back(MachineMove(CSLabel, DstML, SrcML));
-
- DstML = MachineLocation(MachineLocation::VirtualFP, -12);
- SrcML = MachineLocation(Mips::S0);
- Moves.push_back(MachineMove(CSLabel, DstML, SrcML));
-
- DstML = MachineLocation(MachineLocation::VirtualFP, -4);
- SrcML = MachineLocation(Mips::RA);
- Moves.push_back(MachineMove(CSLabel, DstML, SrcML));
-
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, -StackSize));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+
+ if (CSI.size()) {
+ const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
+
+ 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();
+ unsigned DReg = MRI->getDwarfRegNum(Reg, true);
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createOffset(nullptr, DReg, Offset));
+ BuildMI(MBB, MBBI, dl, TII.get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
+ }
if (hasFP(MF))
BuildMI(MBB, MBBI, dl, TII.get(Mips::MoveR3216), Mips::S0)
- .addReg(Mips::SP);
+ .addReg(Mips::SP).setMIFlag(MachineInstr::FrameSetup);
}
return true;
}
+// Eliminate ADJCALLSTACKDOWN, ADJCALLSTACKUP pseudo instructions
+void Mips16FrameLowering::
+eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I) const {
+ if (!hasReservedCallFrame(MF)) {
+ int64_t Amount = I->getOperand(0).getImm();
+
+ if (I->getOpcode() == Mips::ADJCALLSTACKDOWN)
+ Amount = -Amount;
+
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo*>(MF.getTarget().getInstrInfo());
+
+ TII.adjustStackPtr(Mips::SP, Amount, MBB, I);
+ }
+
+ MBB.erase(I);
+}
+
bool
Mips16FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
void Mips16FrameLowering::
processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
- MF.getRegInfo().setPhysRegUsed(Mips::RA);
- MF.getRegInfo().setPhysRegUsed(Mips::S0);
- MF.getRegInfo().setPhysRegUsed(Mips::S1);
+ const Mips16InstrInfo &TII =
+ *static_cast<const Mips16InstrInfo*>(MF.getTarget().getInstrInfo());
+ const MipsRegisterInfo &RI = TII.getRegisterInfo();
+ const BitVector Reserved = RI.getReservedRegs(MF);
+ bool SaveS2 = Reserved[Mips::S2];
+ if (SaveS2)
+ MF.getRegInfo().setPhysRegUsed(Mips::S2);
+ if (hasFP(MF))
+ MF.getRegInfo().setPhysRegUsed(Mips::S0);
}
const MipsFrameLowering *