#include "SystemZTargetMachine.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/RegisterScavenging.h"
#include "llvm/IR/Function.h"
using namespace llvm;
+namespace {
+// The ABI-defined register save slots, relative to the incoming stack
+// pointer.
+static const TargetFrameLowering::SpillSlot SpillOffsetTable[] = {
+ { SystemZ::R2D, 0x10 },
+ { SystemZ::R3D, 0x18 },
+ { SystemZ::R4D, 0x20 },
+ { SystemZ::R5D, 0x28 },
+ { SystemZ::R6D, 0x30 },
+ { SystemZ::R7D, 0x38 },
+ { SystemZ::R8D, 0x40 },
+ { SystemZ::R9D, 0x48 },
+ { SystemZ::R10D, 0x50 },
+ { SystemZ::R11D, 0x58 },
+ { SystemZ::R12D, 0x60 },
+ { SystemZ::R13D, 0x68 },
+ { SystemZ::R14D, 0x70 },
+ { SystemZ::R15D, 0x78 },
+ { SystemZ::F0D, 0x80 },
+ { SystemZ::F2D, 0x88 },
+ { SystemZ::F4D, 0x90 },
+ { SystemZ::F6D, 0x98 }
+};
+} // end anonymous namespace
+
SystemZFrameLowering::SystemZFrameLowering(const SystemZTargetMachine &tm,
const SystemZSubtarget &sti)
: TargetFrameLowering(TargetFrameLowering::StackGrowsDown, 8,
- -SystemZMC::CallFrameSize),
- TM(tm),
- STI(sti) {
- // The ABI-defined register save slots, relative to the incoming stack
- // pointer.
- static const unsigned SpillOffsetTable[][2] = {
- { SystemZ::R2D, 0x10 },
- { SystemZ::R3D, 0x18 },
- { SystemZ::R4D, 0x20 },
- { SystemZ::R5D, 0x28 },
- { SystemZ::R6D, 0x30 },
- { SystemZ::R7D, 0x38 },
- { SystemZ::R8D, 0x40 },
- { SystemZ::R9D, 0x48 },
- { SystemZ::R10D, 0x50 },
- { SystemZ::R11D, 0x58 },
- { SystemZ::R12D, 0x60 },
- { SystemZ::R13D, 0x68 },
- { SystemZ::R14D, 0x70 },
- { SystemZ::R15D, 0x78 },
- { SystemZ::F0D, 0x80 },
- { SystemZ::F2D, 0x88 },
- { SystemZ::F4D, 0x90 },
- { SystemZ::F6D, 0x98 }
- };
-
+ -SystemZMC::CallFrameSize, 8),
+ TM(tm), STI(sti) {
// Create a mapping from register number to save slot offset.
RegSpillOffsets.grow(SystemZ::NUM_TARGET_REGS);
for (unsigned I = 0, E = array_lengthof(SpillOffsetTable); I != E; ++I)
- RegSpillOffsets[SpillOffsetTable[I][0]] = SpillOffsetTable[I][1];
+ RegSpillOffsets[SpillOffsetTable[I].Reg] = SpillOffsetTable[I].Offset;
+}
+
+const TargetFrameLowering::SpillSlot *
+SystemZFrameLowering::getCalleeSavedSpillSlots(unsigned &NumEntries) const {
+ NumEntries = array_lengthof(SpillOffsetTable);
+ return SpillOffsetTable;
}
void SystemZFrameLowering::
const SystemZTargetMachine &TM,
unsigned GPR64, bool IsImplicit) {
const SystemZRegisterInfo *RI = TM.getRegisterInfo();
- unsigned GPR32 = RI->getSubReg(GPR64, SystemZ::subreg_32bit);
+ unsigned GPR32 = RI->getSubReg(GPR64, SystemZ::subreg_l32);
bool IsLive = MBB.isLiveIn(GPR64) || MBB.isLiveIn(GPR32);
if (!IsLive || !IsImplicit) {
MIB.addReg(GPR64, getImplRegState(IsImplicit) | getKillRegState(!IsLive));
DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
// Scan the call-saved GPRs and find the bounds of the register spill area.
- unsigned SavedGPRFrameSize = 0;
unsigned LowGPR = 0;
unsigned HighGPR = SystemZ::R15D;
unsigned StartOffset = -1U;
for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
unsigned Reg = CSI[I].getReg();
if (SystemZ::GR64BitRegClass.contains(Reg)) {
- SavedGPRFrameSize += 8;
unsigned Offset = RegSpillOffsets[Reg];
assert(Offset && "Unexpected GPR save");
if (StartOffset > Offset) {
}
}
- // Save information about the range and location of the call-saved
- // registers, for use by the epilogue inserter.
- ZFI->setSavedGPRFrameSize(SavedGPRFrameSize);
+ // Save the range of call-saved registers, for use by the epilogue inserter.
ZFI->setLowSavedGPR(LowGPR);
ZFI->setHighSavedGPR(HighGPR);
return true;
}
+void SystemZFrameLowering::
+processFunctionBeforeFrameFinalized(MachineFunction &MF,
+ RegScavenger *RS) const {
+ MachineFrameInfo *MFFrame = MF.getFrameInfo();
+ uint64_t MaxReach = (MFFrame->estimateStackSize(MF) +
+ SystemZMC::CallFrameSize * 2);
+ if (!isUInt<12>(MaxReach)) {
+ // We may need register scavenging slots if some parts of the frame
+ // are outside the reach of an unsigned 12-bit displacement.
+ // Create 2 for the case where both addresses in an MVC are
+ // out of range.
+ RS->addScavengingFrameIndex(MFFrame->CreateStackObject(8, 8, false));
+ RS->addScavengingFrameIndex(MFFrame->CreateStackObject(8, 8, false));
+ }
+}
+
// Emit instructions before MBBI (in MBB) to add NumBytes to Reg.
static void emitIncrement(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI,
void SystemZFrameLowering::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock &MBB = MF.front();
MachineFrameInfo *MFFrame = MF.getFrameInfo();
- const SystemZInstrInfo *ZII =
+ auto *ZII =
static_cast<const SystemZInstrInfo*>(MF.getTarget().getInstrInfo());
SystemZMachineFunctionInfo *ZFI = MF.getInfo<SystemZMachineFunctionInfo>();
MachineBasicBlock::iterator MBBI = MBB.begin();
llvm_unreachable("Couldn't skip over GPR saves");
// Add CFI for the GPR saves.
- MCSymbol *GPRSaveLabel = MMI.getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, DL,
- ZII->get(TargetOpcode::PROLOG_LABEL)).addSym(GPRSaveLabel);
- for (std::vector<CalleeSavedInfo>::const_iterator
- I = CSI.begin(), E = CSI.end(); I != E; ++I) {
- unsigned Reg = I->getReg();
+ for (auto &Save : CSI) {
+ unsigned Reg = Save.getReg();
if (SystemZ::GR64BitRegClass.contains(Reg)) {
int64_t Offset = SPOffsetFromCFA + RegSpillOffsets[Reg];
- MMI.addFrameInst(MCCFIInstruction::createOffset(
- GPRSaveLabel, MRI->getDwarfRegNum(Reg, true), Offset));
+ unsigned CFIIndex = MMI.addFrameInst(MCCFIInstruction::createOffset(
+ nullptr, MRI->getDwarfRegNum(Reg, true), Offset));
+ BuildMI(MBB, MBBI, DL, ZII->get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
}
}
}
emitIncrement(MBB, MBBI, DL, SystemZ::R15D, Delta, ZII);
// Add CFI for the allocation.
- MCSymbol *AdjustSPLabel = MMI.getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, DL, ZII->get(TargetOpcode::PROLOG_LABEL))
- .addSym(AdjustSPLabel);
- MMI.addFrameInst(MCCFIInstruction::createDefCfaOffset(
- AdjustSPLabel, SPOffsetFromCFA + Delta));
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaOffset(nullptr, SPOffsetFromCFA + Delta));
+ BuildMI(MBB, MBBI, DL, ZII->get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
SPOffsetFromCFA += Delta;
}
.addReg(SystemZ::R15D);
// Add CFI for the new frame location.
- MCSymbol *SetFPLabel = MMI.getContext().CreateTempSymbol();
- BuildMI(MBB, MBBI, DL, ZII->get(TargetOpcode::PROLOG_LABEL))
- .addSym(SetFPLabel);
unsigned HardFP = MRI->getDwarfRegNum(SystemZ::R11D, true);
- MMI.addFrameInst(
- MCCFIInstruction::createDefCfaRegister(SetFPLabel, HardFP));
+ unsigned CFIIndex = MMI.addFrameInst(
+ MCCFIInstruction::createDefCfaRegister(nullptr, HardFP));
+ BuildMI(MBB, MBBI, DL, ZII->get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
// Mark the FramePtr as live at the beginning of every block except
// the entry block. (We'll have marked R11 as live on entry when
// saving the GPRs.)
- for (MachineFunction::iterator
- I = llvm::next(MF.begin()), E = MF.end(); I != E; ++I)
+ for (auto I = std::next(MF.begin()), E = MF.end(); I != E; ++I)
I->addLiveIn(SystemZ::R11D);
}
// Skip over the FPR saves.
- MCSymbol *FPRSaveLabel = 0;
- for (std::vector<CalleeSavedInfo>::const_iterator
- I = CSI.begin(), E = CSI.end(); I != E; ++I) {
- unsigned Reg = I->getReg();
+ SmallVector<unsigned, 8> CFIIndexes;
+ for (auto &Save : CSI) {
+ unsigned Reg = Save.getReg();
if (SystemZ::FP64BitRegClass.contains(Reg)) {
if (MBBI != MBB.end() &&
(MBBI->getOpcode() == SystemZ::STD ||
llvm_unreachable("Couldn't skip over FPR save");
// Add CFI for the this save.
- if (!FPRSaveLabel)
- FPRSaveLabel = MMI.getContext().CreateTempSymbol();
- unsigned Reg = MRI->getDwarfRegNum(I->getReg(), true);
- int64_t Offset = getFrameIndexOffset(MF, I->getFrameIdx());
- MMI.addFrameInst(MCCFIInstruction::createOffset(
- FPRSaveLabel, Reg, SPOffsetFromCFA + Offset));
+ unsigned DwarfReg = MRI->getDwarfRegNum(Reg, true);
+ int64_t Offset = getFrameIndexOffset(MF, Save.getFrameIdx());
+ unsigned CFIIndex = MMI.addFrameInst(MCCFIInstruction::createOffset(
+ nullptr, DwarfReg, SPOffsetFromCFA + Offset));
+ CFIIndexes.push_back(CFIIndex);
}
}
// Complete the CFI for the FPR saves, modelling them as taking effect
// after the last save.
- if (FPRSaveLabel)
- BuildMI(MBB, MBBI, DL, ZII->get(TargetOpcode::PROLOG_LABEL))
- .addSym(FPRSaveLabel);
+ for (auto CFIIndex : CFIIndexes) {
+ BuildMI(MBB, MBBI, DL, ZII->get(TargetOpcode::CFI_INSTRUCTION))
+ .addCFIIndex(CFIIndex);
+ }
}
void SystemZFrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
MachineBasicBlock::iterator MBBI = MBB.getLastNonDebugInstr();
- const SystemZInstrInfo *ZII =
+ auto *ZII =
static_cast<const SystemZInstrInfo*>(MF.getTarget().getInstrInfo());
SystemZMachineFunctionInfo *ZFI = MF.getInfo<SystemZMachineFunctionInfo>();
// Skip the return instruction.
- assert(MBBI->getOpcode() == SystemZ::RET &&
- "Can only insert epilogue into returning blocks");
+ assert(MBBI->isReturn() && "Can only insert epilogue into returning blocks");
uint64_t StackSize = getAllocatedStackSize(MF);
if (ZFI->getLowSavedGPR()) {
// offset is therefore negative.
int64_t Offset = (MFFrame->getObjectOffset(FI) +
MFFrame->getOffsetAdjustment());
- if (FI >= 0)
- // Non-fixed objects are allocated below the incoming stack pointer.
- // Account for the space at the top of the frame that we choose not
- // to allocate.
- Offset += getUnallocatedTopBytes(MF);
// Make the offset relative to the incoming stack pointer.
Offset -= getOffsetOfLocalArea();
return Offset;
}
-uint64_t SystemZFrameLowering::
-getUnallocatedTopBytes(const MachineFunction &MF) const {
- return MF.getInfo<SystemZMachineFunctionInfo>()->getSavedGPRFrameSize();
-}
-
uint64_t SystemZFrameLowering::
getAllocatedStackSize(const MachineFunction &MF) const {
const MachineFrameInfo *MFFrame = MF.getFrameInfo();
// Start with the size of the local variables and spill slots.
uint64_t StackSize = MFFrame->getStackSize();
- // Remove any bytes that we choose not to allocate.
- StackSize -= getUnallocatedTopBytes(MF);
-
- // Include space for an emergency spill slot, if one might be needed.
- StackSize += getEmergencySpillSlotSize(MF);
-
// We need to allocate the ABI-defined 160-byte base area whenever
// we allocate stack space for our own use and whenever we call another
// function.
return StackSize;
}
-unsigned SystemZFrameLowering::
-getEmergencySpillSlotSize(const MachineFunction &MF) const {
- const MachineFrameInfo *MFFrame = MF.getFrameInfo();
- uint64_t MaxReach = MFFrame->getStackSize() + SystemZMC::CallFrameSize * 2;
- return isUInt<12>(MaxReach) ? 0 : 8;
-}
-
-unsigned SystemZFrameLowering::
-getEmergencySpillSlotOffset(const MachineFunction &MF) const {
- assert(getEmergencySpillSlotSize(MF) && "No emergency spill slot");
- return SystemZMC::CallFrameSize;
-}
-
bool
SystemZFrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
// The ABI requires us to allocate 160 bytes of stack space for the callee,
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