#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetInstrInfo.h"
+using namespace llvm;
+
#define GET_REGINFO_TARGET_DESC
#include "SparcGenRegisterInfo.inc"
-using namespace llvm;
-
static cl::opt<bool>
ReserveAppRegisters("sparc-reserve-app-registers", cl::Hidden, cl::init(false),
cl::desc("Reserve application registers (%g2-%g4)"));
-SparcRegisterInfo::SparcRegisterInfo(SparcSubtarget &st,
- const TargetInstrInfo &tii)
- : SparcGenRegisterInfo(SP::I7), Subtarget(st), TII(tii) {
+SparcRegisterInfo::SparcRegisterInfo() : SparcGenRegisterInfo(SP::O7) {}
+
+const MCPhysReg*
+SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
+ return CSR_SaveList;
+}
+
+const uint32_t *
+SparcRegisterInfo::getCallPreservedMask(const MachineFunction &MF,
+ CallingConv::ID CC) const {
+ return CSR_RegMask;
}
-const uint16_t* SparcRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF)
- const {
- static const uint16_t CalleeSavedRegs[] = { 0 };
- return CalleeSavedRegs;
+const uint32_t*
+SparcRegisterInfo::getRTCallPreservedMask(CallingConv::ID CC) const {
+ return RTCSR_RegMask;
}
BitVector SparcRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
+ const SparcSubtarget &Subtarget = MF.getSubtarget<SparcSubtarget>();
// FIXME: G1 reserved for now for large imm generation by frame code.
Reserved.set(SP::G1);
- //G1-G4 can be used in applications.
+ // G1-G4 can be used in applications.
if (ReserveAppRegisters) {
Reserved.set(SP::G2);
Reserved.set(SP::G3);
Reserved.set(SP::G4);
}
- //G5 is not reserved in 64 bit mode.
+ // G5 is not reserved in 64 bit mode.
if (!Subtarget.is64Bit())
Reserved.set(SP::G5);
Reserved.set(SP::G0);
Reserved.set(SP::G6);
Reserved.set(SP::G7);
+
+ // Also reserve the register pair aliases covering the above
+ // registers, with the same conditions.
+ Reserved.set(SP::G0_G1);
+ if (ReserveAppRegisters)
+ Reserved.set(SP::G2_G3);
+ if (ReserveAppRegisters || !Subtarget.is64Bit())
+ Reserved.set(SP::G4_G5);
+
+ Reserved.set(SP::O6_O7);
+ Reserved.set(SP::I6_I7);
+ Reserved.set(SP::G6_G7);
+
+ // Unaliased double registers are not available in non-V9 targets.
+ if (!Subtarget.isV9()) {
+ for (unsigned n = 0; n != 16; ++n) {
+ for (MCRegAliasIterator AI(SP::D16 + n, this, true); AI.isValid(); ++AI)
+ Reserved.set(*AI);
+ }
+ }
+
return Reserved;
}
const TargetRegisterClass*
SparcRegisterInfo::getPointerRegClass(const MachineFunction &MF,
unsigned Kind) const {
+ const SparcSubtarget &Subtarget = MF.getSubtarget<SparcSubtarget>();
return Subtarget.is64Bit() ? &SP::I64RegsRegClass : &SP::IntRegsRegClass;
}
-void
-SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, unsigned FIOperandNum,
- RegScavenger *RS) const {
- assert(SPAdj == 0 && "Unexpected");
-
- MachineInstr &MI = *II;
- DebugLoc dl = MI.getDebugLoc();
- int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
-
- // Addressable stack objects are accessed using neg. offsets from %fp
- MachineFunction &MF = *MI.getParent()->getParent();
- int64_t Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
- MI.getOperand(FIOperandNum + 1).getImm() +
- Subtarget.getStackPointerBias();
- SparcMachineFunctionInfo *FuncInfo = MF.getInfo<SparcMachineFunctionInfo>();
- unsigned FramePtr = (FuncInfo->isLeafProc()) ? SP::O6 : SP::I6;
+static void replaceFI(MachineFunction &MF,
+ MachineBasicBlock::iterator II,
+ MachineInstr &MI,
+ DebugLoc dl,
+ unsigned FIOperandNum, int Offset,
+ unsigned FramePtr)
+{
// Replace frame index with a frame pointer reference.
if (Offset >= -4096 && Offset <= 4095) {
// If the offset is small enough to fit in the immediate field, directly
// encode it.
MI.getOperand(FIOperandNum).ChangeToRegister(FramePtr, false);
MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
- } else {
- // Otherwise, emit a G1 = SETHI %hi(offset). FIXME: it would be better to
- // scavenge a register here instead of reserving G1 all of the time.
- unsigned OffHi = (unsigned)Offset >> 10U;
- BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1).addImm(OffHi);
+ return;
+ }
+
+ const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
+
+ // FIXME: it would be better to scavenge a register here instead of
+ // reserving G1 all of the time.
+ if (Offset >= 0) {
+ // Emit nonnegaive immediates with sethi + or.
+ // sethi %hi(Offset), %g1
+ // add %g1, %fp, %g1
+ // Insert G1+%lo(offset) into the user.
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1)
+ .addImm(HI22(Offset));
+
+
// Emit G1 = G1 + I6
BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1)
.addReg(FramePtr);
// Insert: G1+%lo(offset) into the user.
MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false);
- MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset & ((1 << 10)-1));
+ MI.getOperand(FIOperandNum + 1).ChangeToImmediate(LO10(Offset));
+ return;
}
+
+ // Emit Negative numbers with sethi + xor
+ // sethi %hix(Offset), %g1
+ // xor %g1, %lox(offset), %g1
+ // add %g1, %fp, %g1
+ // Insert: G1 + 0 into the user.
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::SETHIi), SP::G1)
+ .addImm(HIX22(Offset));
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::XORri), SP::G1)
+ .addReg(SP::G1).addImm(LOX10(Offset));
+
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::ADDrr), SP::G1).addReg(SP::G1)
+ .addReg(FramePtr);
+ // Insert: G1+%lo(offset) into the user.
+ MI.getOperand(FIOperandNum).ChangeToRegister(SP::G1, false);
+ MI.getOperand(FIOperandNum + 1).ChangeToImmediate(0);
+}
+
+
+void
+SparcRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, unsigned FIOperandNum,
+ RegScavenger *RS) const {
+ assert(SPAdj == 0 && "Unexpected");
+
+ MachineInstr &MI = *II;
+ DebugLoc dl = MI.getDebugLoc();
+ int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
+ MachineFunction &MF = *MI.getParent()->getParent();
+ const SparcSubtarget &Subtarget = MF.getSubtarget<SparcSubtarget>();
+ const SparcFrameLowering *TFI = getFrameLowering(MF);
+
+ unsigned FrameReg;
+ int Offset;
+ Offset = TFI->getFrameIndexReference(MF, FrameIndex, FrameReg);
+
+ Offset += MI.getOperand(FIOperandNum + 1).getImm();
+
+ if (!Subtarget.isV9() || !Subtarget.hasHardQuad()) {
+ if (MI.getOpcode() == SP::STQFri) {
+ const TargetInstrInfo &TII = *Subtarget.getInstrInfo();
+ unsigned SrcReg = MI.getOperand(2).getReg();
+ unsigned SrcEvenReg = getSubReg(SrcReg, SP::sub_even64);
+ unsigned SrcOddReg = getSubReg(SrcReg, SP::sub_odd64);
+ MachineInstr *StMI =
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::STDFri))
+ .addReg(FrameReg).addImm(0).addReg(SrcEvenReg);
+ replaceFI(MF, II, *StMI, dl, 0, Offset, FrameReg);
+ MI.setDesc(TII.get(SP::STDFri));
+ MI.getOperand(2).setReg(SrcOddReg);
+ Offset += 8;
+ } else if (MI.getOpcode() == SP::LDQFri) {
+ const TargetInstrInfo &TII = *Subtarget.getInstrInfo();
+ unsigned DestReg = MI.getOperand(0).getReg();
+ unsigned DestEvenReg = getSubReg(DestReg, SP::sub_even64);
+ unsigned DestOddReg = getSubReg(DestReg, SP::sub_odd64);
+ MachineInstr *StMI =
+ BuildMI(*MI.getParent(), II, dl, TII.get(SP::LDDFri), DestEvenReg)
+ .addReg(FrameReg).addImm(0);
+ replaceFI(MF, II, *StMI, dl, 1, Offset, FrameReg);
+
+ MI.setDesc(TII.get(SP::LDDFri));
+ MI.getOperand(0).setReg(DestOddReg);
+ Offset += 8;
+ }
+ }
+
+ replaceFI(MF, II, MI, dl, FIOperandNum, Offset, FrameReg);
+
}
unsigned SparcRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
return SP::I6;
}
-unsigned SparcRegisterInfo::getEHExceptionRegister() const {
- llvm_unreachable("What is the exception register");
-}
+// Sparc has no architectural need for stack realignment support,
+// except that LLVM unfortunately currently implements overaligned
+// stack objects by depending upon stack realignment support.
+// If that ever changes, this can probably be deleted.
+bool SparcRegisterInfo::canRealignStack(const MachineFunction &MF) const {
+ if (!TargetRegisterInfo::canRealignStack(MF))
+ return false;
+
+ // Sparc always has a fixed frame pointer register, so don't need to
+ // worry about needing to reserve it. [even if we don't have a frame
+ // pointer for our frame, it still cannot be used for other things,
+ // or register window traps will be SADNESS.]
+
+ // If there's a reserved call frame, we can use SP to access locals.
+ if (getFrameLowering(MF)->hasReservedCallFrame(MF))
+ return true;
+
+ // Otherwise, we'd need a base pointer, but those aren't implemented
+ // for SPARC at the moment.
-unsigned SparcRegisterInfo::getEHHandlerRegister() const {
- llvm_unreachable("What is the exception handler register");
+ return false;
}
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