return CalleeSavedRegs;
}
-const TargetRegisterClass* const*
-SystemZRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
- static const TargetRegisterClass * const CalleeSavedRegClasses[] = {
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::GR64RegClass, &SystemZ::GR64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass,
- &SystemZ::FP64RegClass, &SystemZ::FP64RegClass, 0
- };
- return CalleeSavedRegClasses;
-}
-
BitVector SystemZRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
- if (hasFP(MF))
+ const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
+
+ if (TFI->hasFP(MF))
Reserved.set(SystemZ::R11D);
Reserved.set(SystemZ::R14D);
Reserved.set(SystemZ::R15D);
return Reserved;
}
-/// needsFP - Return true if the specified function should have a dedicated
-/// frame pointer register. This is true if the function has variable sized
-/// allocas or if frame pointer elimination is disabled.
-bool SystemZRegisterInfo::hasFP(const MachineFunction &MF) const {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- return NoFramePointerElim || MFI->hasVarSizedObjects();
-}
-
void SystemZRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
MBB.erase(I);
}
-int SystemZRegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const {
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- SystemZMachineFunctionInfo *SystemZMFI =
- MF.getInfo<SystemZMachineFunctionInfo>();
- int Offset = MFI->getObjectOffset(FI) + MFI->getOffsetAdjustment();
- uint64_t StackSize = MFI->getStackSize();
-
- // Fixed objects are really located in the "previous" frame.
- if (FI < 0)
- StackSize -= SystemZMFI->getCalleeSavedFrameSize();
-
- Offset += StackSize - TFI.getOffsetOfLocalArea();
-
- // Skip the register save area if we generated the stack frame.
- if (StackSize || MFI->hasCalls())
- Offset -= TFI.getOffsetOfLocalArea();
-
- return Offset;
-}
-
-void SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const {
+void
+SystemZRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, RegScavenger *RS) const {
assert(SPAdj == 0 && "Unxpected");
unsigned i = 0;
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
+ const TargetFrameInfo *TFI = MF.getTarget().getFrameInfo();
+
while (!MI.getOperand(i).isFI()) {
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
int FrameIndex = MI.getOperand(i).getIndex();
- unsigned BasePtr = (hasFP(MF) ? SystemZ::R11D : SystemZ::R15D);
+ unsigned BasePtr = (TFI->hasFP(MF) ? SystemZ::R11D : SystemZ::R15D);
// This must be part of a rri or ri operand memory reference. Replace the
// FrameIndex with base register with BasePtr. Add an offset to the
// Offset is a either 12-bit unsigned or 20-bit signed integer.
// FIXME: handle "too long" displacements.
- int Offset = getFrameIndexOffset(MF, FrameIndex) + MI.getOperand(i+1).getImm();
+ int Offset =
+ TFI->getFrameIndexOffset(MF, FrameIndex) + MI.getOperand(i+1).getImm();
// Check whether displacement is too long to fit into 12 bit zext field.
- if (Offset < 0 || Offset >= 4096)
- MI.setDesc(TII.getLongDispOpc(MI.getOpcode()));
+ MI.setDesc(TII.getMemoryInstr(MI.getOpcode(), Offset));
MI.getOperand(i+1).ChangeToImmediate(Offset);
}
-void
-SystemZRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
- RegScavenger *RS) const {
- // Determine whether R15/R14 will ever be clobbered inside the function. And
- // if yes - mark it as 'callee' saved.
- MachineFrameInfo *FFI = MF.getFrameInfo();
- MachineRegisterInfo &MRI = MF.getRegInfo();
-
- // Check whether high FPRs are ever used, if yes - we need to save R15 as
- // well.
- static const unsigned HighFPRs[] = {
- SystemZ::F8L, SystemZ::F9L, SystemZ::F10L, SystemZ::F11L,
- SystemZ::F12L, SystemZ::F13L, SystemZ::F14L, SystemZ::F15L,
- SystemZ::F8S, SystemZ::F9S, SystemZ::F10S, SystemZ::F11S,
- SystemZ::F12S, SystemZ::F13S, SystemZ::F14S, SystemZ::F15S,
- };
-
- bool HighFPRsUsed = false;
- for (unsigned i = 0, e = array_lengthof(HighFPRs); i != e; ++i)
- HighFPRsUsed |= MRI.isPhysRegUsed(HighFPRs[i]);
-
- if (FFI->hasCalls())
- /* FIXME: function is varargs */
- /* FIXME: function grabs RA */
- /* FIXME: function calls eh_return */
- MRI.setPhysRegUsed(SystemZ::R14D);
-
- if (HighFPRsUsed ||
- FFI->hasCalls() ||
- FFI->getObjectIndexEnd() != 0 || // Contains automatic variables
- FFI->hasVarSizedObjects() // Function calls dynamic alloca's
- /* FIXME: function is varargs */)
- MRI.setPhysRegUsed(SystemZ::R15D);
-}
-
-/// emitSPUpdate - Emit a series of instructions to increment / decrement the
-/// stack pointer by a constant value.
-static
-void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
- int64_t NumBytes, const TargetInstrInfo &TII) {
- // FIXME: Handle different stack sizes here.
- bool isSub = NumBytes < 0;
- uint64_t Offset = isSub ? -NumBytes : NumBytes;
- unsigned Opc = SystemZ::ADD64ri16;
- uint64_t Chunk = (1LL << 15) - 1;
- DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() :
- DebugLoc::getUnknownLoc());
-
- while (Offset) {
- uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset;
- MachineInstr *MI =
- BuildMI(MBB, MBBI, DL, TII.get(Opc), SystemZ::R15D)
- .addReg(SystemZ::R15D).addImm((isSub ? -(int64_t)ThisVal : ThisVal));
- // The PSW implicit def is dead.
- MI->getOperand(3).setIsDead();
- Offset -= ThisVal;
- }
-}
-
-void SystemZRegisterInfo::emitPrologue(MachineFunction &MF) const {
- MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineFrameInfo *MFI = MF.getFrameInfo();
- SystemZMachineFunctionInfo *SystemZMFI =
- MF.getInfo<SystemZMachineFunctionInfo>();
- MachineBasicBlock::iterator MBBI = MBB.begin();
- DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() :
- DebugLoc::getUnknownLoc());
-
- // Get the number of bytes to allocate from the FrameInfo.
- // Note that area for callee-saved stuff is already allocated, thus we need to
- // 'undo' the stack movement.
- uint64_t StackSize = MFI->getStackSize();
- StackSize -= SystemZMFI->getCalleeSavedFrameSize();
-
- uint64_t NumBytes = StackSize - TFI.getOffsetOfLocalArea();
-
- // Skip the callee-saved push instructions.
- while (MBBI != MBB.end() &&
- (MBBI->getOpcode() == SystemZ::MOV64mr ||
- MBBI->getOpcode() == SystemZ::MOV64mrm))
- ++MBBI;
-
- if (MBBI != MBB.end())
- DL = MBBI->getDebugLoc();
-
- // adjust stack pointer: R15 -= numbytes
- if (StackSize || MFI->hasCalls()) {
- assert(MF.getRegInfo().isPhysRegUsed(SystemZ::R15D) &&
- "Invalid stack frame calculation!");
- emitSPUpdate(MBB, MBBI, -(int64_t)NumBytes, TII);
- }
-
- if (hasFP(MF)) {
- // Update R11 with the new base value...
- BuildMI(MBB, MBBI, DL, TII.get(SystemZ::MOV64rr), SystemZ::R11D)
- .addReg(SystemZ::R15D);
-
- // Mark the FramePtr as live-in in every block except the entry.
- for (MachineFunction::iterator I = next(MF.begin()), E = MF.end();
- I != E; ++I)
- I->addLiveIn(SystemZ::R11D);
-
- }
-}
-
-void SystemZRegisterInfo::emitEpilogue(MachineFunction &MF,
- MachineBasicBlock &MBB) const {
- const MachineFrameInfo *MFI = MF.getFrameInfo();
- const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineBasicBlock::iterator MBBI = prior(MBB.end());
- SystemZMachineFunctionInfo *SystemZMFI =
- MF.getInfo<SystemZMachineFunctionInfo>();
- unsigned RetOpcode = MBBI->getOpcode();
- DebugLoc DL = MBBI->getDebugLoc();
-
- switch (RetOpcode) {
- case SystemZ::RET: break; // These are ok
- default:
- assert(0 && "Can only insert epilog into returning blocks");
- }
-
- // Get the number of bytes to allocate from the FrameInfo
- // Note that area for callee-saved stuff is already allocated, thus we need to
- // 'undo' the stack movement.
- uint64_t StackSize =
- MFI->getStackSize() - SystemZMFI->getCalleeSavedFrameSize();
- uint64_t NumBytes = StackSize - TFI.getOffsetOfLocalArea();
-
- // Skip the final terminator instruction.
- while (MBBI != MBB.begin()) {
- MachineBasicBlock::iterator PI = prior(MBBI);
- --MBBI;
- if (!PI->getDesc().isTerminator())
- break;
- }
-
- // During callee-saved restores emission stack frame was not yet finialized
- // (and thus - the stack size was unknown). Tune the offset having full stack
- // size in hands.
- if (StackSize || MFI->hasCalls()) {
- assert((MBBI->getOpcode() == SystemZ::MOV64rmm ||
- MBBI->getOpcode() == SystemZ::MOV64rm) &&
- "Expected to see callee-save register restore code");
- assert(MF.getRegInfo().isPhysRegUsed(SystemZ::R15D) &&
- "Invalid stack frame calculation!");
-
- unsigned i = 0;
- MachineInstr &MI = *MBBI;
- while (!MI.getOperand(i).isImm()) {
- ++i;
- assert(i < MI.getNumOperands() && "Unexpected restore code!");
- }
-
- MI.getOperand(i).ChangeToImmediate(NumBytes + MI.getOperand(i).getImm());
- }
-}
-
unsigned SystemZRegisterInfo::getRARegister() const {
assert(0 && "What is the return address register");
return 0;
}
-unsigned SystemZRegisterInfo::getFrameRegister(MachineFunction &MF) const {
+unsigned
+SystemZRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
assert(0 && "What is the frame register");
return 0;
}
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