#include "ARM.h"
#include "ARMAddressingModes.h"
+#include "ARMBaseInstrInfo.h"
#include "ARMMachineFunctionInfo.h"
#include "ARMSubtarget.h"
#include "Thumb1InstrInfo.h"
#include "Thumb1RegisterInfo.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
+#include "llvm/LLVMContext.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
-static cl::opt<bool>
-ThumbRegScavenging("enable-thumb-reg-scavenging",
- cl::Hidden,
- cl::desc("Enable register scavenging on Thumb"));
-
Thumb1RegisterInfo::Thumb1RegisterInfo(const ARMBaseInstrInfo &tii,
const ARMSubtarget &sti)
: ARMBaseRegisterInfo(tii, sti) {
/// specified immediate.
void Thumb1RegisterInfo::emitLoadConstPool(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI,
- const TargetInstrInfo *TII, DebugLoc dl,
- unsigned DestReg, int Val,
+ DebugLoc dl,
+ unsigned DestReg, unsigned SubIdx,
+ int Val,
ARMCC::CondCodes Pred,
unsigned PredReg) const {
MachineFunction &MF = *MBB.getParent();
MachineConstantPool *ConstantPool = MF.getConstantPool();
- Constant *C = ConstantInt::get(Type::Int32Ty, Val);
+ Constant *C = ConstantInt::get(
+ Type::getInt32Ty(MBB.getParent()->getFunction()->getContext()), Val);
unsigned Idx = ConstantPool->getConstantPoolIndex(C, 4);
- BuildMI(MBB, MBBI, dl, TII->get(ARM::tLDRcp), DestReg)
- .addConstantPoolIndex(Idx);
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::tLDRcp))
+ .addReg(DestReg, getDefRegState(true), SubIdx)
+ .addConstantPoolIndex(Idx).addImm(Pred).addReg(PredReg);
}
const TargetRegisterClass*
-Thumb1RegisterInfo::getPhysicalRegisterRegClass(unsigned Reg, MVT VT) const {
+Thumb1RegisterInfo::getPhysicalRegisterRegClass(unsigned Reg, EVT VT) const {
if (isARMLowRegister(Reg))
return ARM::tGPRRegisterClass;
switch (Reg) {
bool
Thumb1RegisterInfo::requiresRegisterScavenging(const MachineFunction &MF) const {
- return ThumbRegScavenging;
+ return true;
+}
+
+bool
+Thumb1RegisterInfo::requiresFrameIndexScavenging(const MachineFunction &MF)
+ const {
+ return true;
}
+
bool Thumb1RegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
const MachineFrameInfo *FFI = MF.getFrameInfo();
unsigned CFSize = FFI->getMaxCallFrameSize();
return !MF.getFrameInfo()->hasVarSizedObjects();
}
+
/// emitThumbRegPlusImmInReg - Emits a series of instructions to materialize
/// a destreg = basereg + immediate in Thumb code. Materialize the immediate
/// in a register using mov / mvn sequences or load the immediate from a
const TargetInstrInfo &TII,
const Thumb1RegisterInfo& MRI,
DebugLoc dl) {
+ MachineFunction &MF = *MBB.getParent();
bool isHigh = !isARMLowRegister(DestReg) ||
(BaseReg != 0 && !isARMLowRegister(BaseReg));
bool isSub = false;
unsigned LdReg = DestReg;
if (DestReg == ARM::SP) {
assert(BaseReg == ARM::SP && "Unexpected!");
- LdReg = ARM::R3;
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVlor2hir), ARM::R12)
- .addReg(ARM::R3, RegState::Kill);
+ LdReg = MF.getRegInfo().createVirtualRegister(ARM::tGPRRegisterClass);
}
if (NumBytes <= 255 && NumBytes >= 0)
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVi8), LdReg).addImm(NumBytes);
+ AddDefaultT1CC(BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVi8), LdReg))
+ .addImm(NumBytes);
else if (NumBytes < 0 && NumBytes >= -255) {
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVi8), LdReg).addImm(NumBytes);
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tNEG), LdReg)
+ AddDefaultT1CC(BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVi8), LdReg))
+ .addImm(NumBytes);
+ AddDefaultT1CC(BuildMI(MBB, MBBI, dl, TII.get(ARM::tRSB), LdReg))
.addReg(LdReg, RegState::Kill);
} else
- MRI.emitLoadConstPool(MBB, MBBI, &TII, dl, LdReg, NumBytes);
+ MRI.emitLoadConstPool(MBB, MBBI, dl, LdReg, 0, NumBytes);
// Emit add / sub.
int Opc = (isSub) ? ARM::tSUBrr : (isHigh ? ARM::tADDhirr : ARM::tADDrr);
- const MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl,
- TII.get(Opc), DestReg);
+ MachineInstrBuilder MIB =
+ BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg);
+ if (Opc != ARM::tADDhirr)
+ MIB = AddDefaultT1CC(MIB);
if (DestReg == ARM::SP || isSub)
MIB.addReg(BaseReg).addReg(LdReg, RegState::Kill);
else
MIB.addReg(LdReg).addReg(BaseReg, RegState::Kill);
- if (DestReg == ARM::SP)
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVhir2lor), ARM::R3)
- .addReg(ARM::R12, RegState::Kill);
+ AddDefaultPred(MIB);
}
/// calcNumMI - Returns the number of instructions required to materialize
unsigned Scale = 1;
int Opc = 0;
int ExtraOpc = 0;
+ bool NeedCC = false;
+ bool NeedPred = false;
if (DestReg == BaseReg && BaseReg == ARM::SP) {
assert(isMul4 && "Thumb sp inc / dec size must be multiple of 4!");
if (DestReg != BaseReg)
DstNotEqBase = true;
NumBits = 8;
- Opc = isSub ? ARM::tSUBi8 : ARM::tADDi8;
+ if (DestReg == ARM::SP) {
+ Opc = isSub ? ARM::tSUBspi : ARM::tADDspi;
+ assert(isMul4 && "Thumb sp inc / dec size must be multiple of 4!");
+ NumBits = 7;
+ Scale = 4;
+ } else {
+ Opc = isSub ? ARM::tSUBi8 : ARM::tADDi8;
+ NumBits = 8;
+ NeedPred = NeedCC = true;
+ }
isTwoAddr = true;
}
unsigned Chunk = (1 << 3) - 1;
unsigned ThisVal = (Bytes > Chunk) ? Chunk : Bytes;
Bytes -= ThisVal;
- BuildMI(MBB, MBBI, dl,TII.get(isSub ? ARM::tSUBi3 : ARM::tADDi3), DestReg)
- .addReg(BaseReg, RegState::Kill).addImm(ThisVal);
+ const TargetInstrDesc &TID = TII.get(isSub ? ARM::tSUBi3 : ARM::tADDi3);
+ const MachineInstrBuilder MIB =
+ AddDefaultT1CC(BuildMI(MBB, MBBI, dl, TID, DestReg));
+ AddDefaultPred(MIB.addReg(BaseReg, RegState::Kill).addImm(ThisVal));
} else {
BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVr), DestReg)
.addReg(BaseReg, RegState::Kill);
Bytes -= ThisVal;
ThisVal /= Scale;
// Build the new tADD / tSUB.
- if (isTwoAddr)
- BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
- .addReg(DestReg).addImm(ThisVal);
+ if (isTwoAddr) {
+ MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg);
+ if (NeedCC)
+ MIB = AddDefaultT1CC(MIB);
+ MIB .addReg(DestReg).addImm(ThisVal);
+ if (NeedPred)
+ MIB = AddDefaultPred(MIB);
+ }
else {
bool isKill = BaseReg != ARM::SP;
- BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
- .addReg(BaseReg, getKillRegState(isKill)).addImm(ThisVal);
+ MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg);
+ if (NeedCC)
+ MIB = AddDefaultT1CC(MIB);
+ MIB.addReg(BaseReg, getKillRegState(isKill)).addImm(ThisVal);
+ if (NeedPred)
+ MIB = AddDefaultPred(MIB);
BaseReg = DestReg;
if (Opc == ARM::tADDrSPi) {
Scale = 1;
Chunk = ((1 << NumBits) - 1) * Scale;
Opc = isSub ? ARM::tSUBi8 : ARM::tADDi8;
- isTwoAddr = true;
+ NeedPred = NeedCC = isTwoAddr = true;
}
}
}
- if (ExtraOpc)
- BuildMI(MBB, MBBI, dl, TII.get(ExtraOpc), DestReg)
- .addReg(DestReg, RegState::Kill)
- .addImm(((unsigned)NumBytes) & 3);
+ if (ExtraOpc) {
+ const TargetInstrDesc &TID = TII.get(ExtraOpc);
+ AddDefaultPred(AddDefaultT1CC(BuildMI(MBB, MBBI, dl, TID, DestReg))
+ .addReg(DestReg, RegState::Kill)
+ .addImm(((unsigned)NumBytes) & 3));
+ }
}
static void emitSPUpdate(MachineBasicBlock &MBB,
int Chunk = (1 << 8) - 1;
int ThisVal = (Imm > Chunk) ? Chunk : Imm;
Imm -= ThisVal;
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVi8), DestReg).addImm(ThisVal);
+ AddDefaultPred(AddDefaultT1CC(BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVi8),
+ DestReg))
+ .addImm(ThisVal));
if (Imm > 0)
emitThumbRegPlusImmediate(MBB, MBBI, DestReg, DestReg, Imm, TII, MRI, dl);
- if (isSub)
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tNEG), DestReg)
- .addReg(DestReg, RegState::Kill);
+ if (isSub) {
+ const TargetInstrDesc &TID = TII.get(ARM::tRSB);
+ AddDefaultPred(AddDefaultT1CC(BuildMI(MBB, MBBI, dl, TID, DestReg))
+ .addReg(DestReg, RegState::Kill));
+ }
+}
+
+static void removeOperands(MachineInstr &MI, unsigned i) {
+ unsigned Op = i;
+ for (unsigned e = MI.getNumOperands(); i != e; ++i)
+ MI.RemoveOperand(Op);
+}
+
+int Thumb1RegisterInfo::
+rewriteFrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
+ unsigned FrameReg, int Offset,
+ unsigned MOVOpc, unsigned ADDriOpc, unsigned SUBriOpc) const
+{
+ // if/when eliminateFrameIndex() conforms with ARMBaseRegisterInfo
+ // version then can pull out Thumb1 specific parts here
+ return 0;
+}
+
+/// saveScavengerRegister - Save the register so it can be used by the
+/// register scavenger. Return true.
+bool Thumb1RegisterInfo::saveScavengerRegister(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I,
+ const TargetRegisterClass *RC,
+ unsigned Reg) const {
+ // Thumb1 can't use the emergency spill slot on the stack because
+ // ldr/str immediate offsets must be positive, and if we're referencing
+ // off the frame pointer (if, for example, there are alloca() calls in
+ // the function, the offset will be negative. Use R12 instead since that's
+ // a call clobbered register that we know won't be used in Thumb1 mode.
+
+ TII.copyRegToReg(MBB, I, ARM::R12, Reg, ARM::GPRRegisterClass, RC);
+ return true;
}
-void Thumb1RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const{
+/// restoreScavengerRegister - restore a registers saved by
+// saveScavengerRegister().
+void Thumb1RegisterInfo::restoreScavengerRegister(MachineBasicBlock &MBB,
+ MachineBasicBlock::iterator I,
+ const TargetRegisterClass *RC,
+ unsigned Reg) const {
+ TII.copyRegToReg(MBB, I, Reg, ARM::R12, RC, ARM::GPRRegisterClass);
+}
+
+unsigned
+Thumb1RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
+ int SPAdj, int *Value,
+ RegScavenger *RS) const{
+ unsigned VReg = 0;
unsigned i = 0;
MachineInstr &MI = *II;
MachineBasicBlock &MBB = *MI.getParent();
unsigned Scale = 1;
if (FrameReg != ARM::SP) {
Opcode = ARM::tADDi3;
- MI.setDesc(TII.get(ARM::tADDi3));
+ MI.setDesc(TII.get(Opcode));
NumBits = 3;
} else {
NumBits = 8;
if (Offset == 0) {
// Turn it into a move.
- MI.setDesc(TII.get(ARM::tMOVhir2lor));
+ MI.setDesc(TII.get(ARM::tMOVgpr2tgpr));
MI.getOperand(i).ChangeToRegister(FrameReg, false);
MI.RemoveOperand(i+1);
- return;
+ return 0;
}
// Common case: small offset, fits into instruction.
unsigned Mask = (1 << NumBits) - 1;
if (((Offset / Scale) & ~Mask) == 0) {
// Replace the FrameIndex with sp / fp
- MI.getOperand(i).ChangeToRegister(FrameReg, false);
- MI.getOperand(i+1).ChangeToImmediate(Offset / Scale);
- return;
+ if (Opcode == ARM::tADDi3) {
+ removeOperands(MI, i);
+ MachineInstrBuilder MIB(&MI);
+ AddDefaultPred(AddDefaultT1CC(MIB).addReg(FrameReg)
+ .addImm(Offset / Scale));
+ } else {
+ MI.getOperand(i).ChangeToRegister(FrameReg, false);
+ MI.getOperand(i+1).ChangeToImmediate(Offset / Scale);
+ }
+ return 0;
}
unsigned DestReg = MI.getOperand(0).getReg();
emitThumbRegPlusImmediate(MBB, II, DestReg, FrameReg, Offset, TII,
*this, dl);
MBB.erase(II);
- return;
+ return 0;
}
if (Offset > 0) {
// Translate r0 = add sp, imm to
// r0 = add sp, 255*4
// r0 = add r0, (imm - 255*4)
- MI.getOperand(i).ChangeToRegister(FrameReg, false);
- MI.getOperand(i+1).ChangeToImmediate(Mask);
+ if (Opcode == ARM::tADDi3) {
+ removeOperands(MI, i);
+ MachineInstrBuilder MIB(&MI);
+ AddDefaultPred(AddDefaultT1CC(MIB).addReg(FrameReg).addImm(Mask));
+ } else {
+ MI.getOperand(i).ChangeToRegister(FrameReg, false);
+ MI.getOperand(i+1).ChangeToImmediate(Mask);
+ }
Offset = (Offset - Mask * Scale);
MachineBasicBlock::iterator NII = next(II);
emitThumbRegPlusImmediate(MBB, NII, DestReg, DestReg, Offset, TII,
// r0 = -imm (this is then translated into a series of instructons)
// r0 = add r0, sp
emitThumbConstant(MBB, II, DestReg, Offset, TII, *this, dl);
+
MI.setDesc(TII.get(ARM::tADDhirr));
MI.getOperand(i).ChangeToRegister(DestReg, false, false, true);
MI.getOperand(i+1).ChangeToRegister(FrameReg, false);
+ if (Opcode == ARM::tADDi3) {
+ MachineInstrBuilder MIB(&MI);
+ AddDefaultPred(MIB);
+ }
}
- return;
+ return 0;
} else {
unsigned ImmIdx = 0;
int InstrOffs = 0;
break;
}
default:
- LLVM_UNREACHABLE("Unsupported addressing mode!");
+ llvm_unreachable("Unsupported addressing mode!");
break;
}
// Replace the FrameIndex with sp
MI.getOperand(i).ChangeToRegister(FrameReg, false);
ImmOp.ChangeToImmediate(ImmedOffset);
- return;
+ return 0;
}
bool isThumSpillRestore = Opcode == ARM::tRestore || Opcode == ARM::tSpill;
// SP+LargeImm.
assert(Offset && "This code isn't needed if offset already handled!");
+ // Remove predicate first.
+ int PIdx = MI.findFirstPredOperandIdx();
+ if (PIdx != -1)
+ removeOperands(MI, PIdx);
+
if (Desc.mayLoad()) {
// Use the destination register to materialize sp + offset.
unsigned TmpReg = MI.getOperand(0).getReg();
emitThumbRegPlusImmInReg(MBB, II, TmpReg, FrameReg,
Offset, false, TII, *this, dl);
else {
- emitLoadConstPool(MBB, II, &TII, dl, TmpReg, Offset);
+ emitLoadConstPool(MBB, II, dl, TmpReg, 0, Offset);
UseRR = true;
}
- } else
+ } else {
emitThumbRegPlusImmediate(MBB, II, TmpReg, FrameReg, Offset, TII,
*this, dl);
+ }
+
MI.setDesc(TII.get(ARM::tLDR));
MI.getOperand(i).ChangeToRegister(TmpReg, false, false, true);
if (UseRR)
else // tLDR has an extra register operand.
MI.addOperand(MachineOperand::CreateReg(0, false));
} else if (Desc.mayStore()) {
- // FIXME! This is horrific!!! We need register scavenging.
- // Our temporary workaround has marked r3 unavailable. Of course, r3 is
- // also a ABI register so it's possible that is is the register that is
- // being storing here. If that's the case, we do the following:
- // r12 = r2
- // Use r2 to materialize sp + offset
- // str r3, r2
- // r2 = r12
- unsigned ValReg = MI.getOperand(0).getReg();
- unsigned TmpReg = ARM::R3;
- bool UseRR = false;
- if (ValReg == ARM::R3) {
- BuildMI(MBB, II, dl, TII.get(ARM::tMOVlor2hir), ARM::R12)
- .addReg(ARM::R2, RegState::Kill);
- TmpReg = ARM::R2;
- }
- if (TmpReg == ARM::R3 && AFI->isR3LiveIn())
- BuildMI(MBB, II, dl, TII.get(ARM::tMOVlor2hir), ARM::R12)
- .addReg(ARM::R3, RegState::Kill);
- if (Opcode == ARM::tSpill) {
- if (FrameReg == ARM::SP)
- emitThumbRegPlusImmInReg(MBB, II, TmpReg, FrameReg,
- Offset, false, TII, *this, dl);
- else {
- emitLoadConstPool(MBB, II, &TII, dl, TmpReg, Offset);
- UseRR = true;
- }
- } else
- emitThumbRegPlusImmediate(MBB, II, TmpReg, FrameReg, Offset, TII,
- *this, dl);
- MI.setDesc(TII.get(ARM::tSTR));
- MI.getOperand(i).ChangeToRegister(TmpReg, false, false, true);
- if (UseRR) // Use [reg, reg] addrmode.
- MI.addOperand(MachineOperand::CreateReg(FrameReg, false));
- else // tSTR has an extra register operand.
- MI.addOperand(MachineOperand::CreateReg(0, false));
-
- MachineBasicBlock::iterator NII = next(II);
- if (ValReg == ARM::R3)
- BuildMI(MBB, NII, dl, TII.get(ARM::tMOVhir2lor), ARM::R2)
- .addReg(ARM::R12, RegState::Kill);
- if (TmpReg == ARM::R3 && AFI->isR3LiveIn())
- BuildMI(MBB, NII, dl, TII.get(ARM::tMOVhir2lor), ARM::R3)
- .addReg(ARM::R12, RegState::Kill);
+ VReg = MF.getRegInfo().createVirtualRegister(ARM::tGPRRegisterClass);
+ assert (Value && "Frame index virtual allocated, but Value arg is NULL!");
+ *Value = Offset;
+ bool UseRR = false;
+
+ if (Opcode == ARM::tSpill) {
+ if (FrameReg == ARM::SP)
+ emitThumbRegPlusImmInReg(MBB, II, VReg, FrameReg,
+ Offset, false, TII, *this, dl);
+ else {
+ emitLoadConstPool(MBB, II, dl, VReg, 0, Offset);
+ UseRR = true;
+ }
+ } else
+ emitThumbRegPlusImmediate(MBB, II, VReg, FrameReg, Offset, TII,
+ *this, dl);
+ MI.setDesc(TII.get(ARM::tSTR));
+ MI.getOperand(i).ChangeToRegister(VReg, false, false, true);
+ if (UseRR) // Use [reg, reg] addrmode.
+ MI.addOperand(MachineOperand::CreateReg(FrameReg, false));
+ else // tSTR has an extra register operand.
+ MI.addOperand(MachineOperand::CreateReg(0, false));
} else
assert(false && "Unexpected opcode!");
+
+ // Add predicate back if it's needed.
+ if (MI.getDesc().isPredicable()) {
+ MachineInstrBuilder MIB(&MI);
+ AddDefaultPred(MIB);
+ }
+ return VReg;
}
void Thumb1RegisterInfo::emitPrologue(MachineFunction &MF) const {
// Darwin ABI requires FP to point to the stack slot that contains the
// previous FP.
if (STI.isTargetDarwin() || hasFP(MF)) {
- MachineInstrBuilder MIB =
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tADDrSPi), FramePtr)
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::tADDrSPi), FramePtr)
.addFrameIndex(FramePtrSpillFI).addImm(0);
}
emitThumbRegPlusImmediate(MBB, MBBI, ARM::SP, FramePtr, -NumBytes,
TII, *this, dl);
else
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVlor2hir), ARM::SP)
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVtgpr2gpr), ARM::SP)
.addReg(FramePtr);
} else {
if (MBBI->getOpcode() == ARM::tBX_RET &&
if (VARegSaveSize) {
// Epilogue for vararg functions: pop LR to R3 and branch off it.
// FIXME: Verify this is still ok when R3 is no longer being reserved.
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tPOP)).addReg(ARM::R3);
+ AddDefaultPred(BuildMI(MBB, MBBI, dl, TII.get(ARM::tPOP)))
+ .addReg(0) // No write back.
+ .addReg(ARM::R3, RegState::Define);
emitSPUpdate(MBB, MBBI, TII, dl, *this, VARegSaveSize);
- BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX_RET_vararg)).addReg(ARM::R3);
+ BuildMI(MBB, MBBI, dl, TII.get(ARM::tBX_RET_vararg))
+ .addReg(ARM::R3, RegState::Kill);
MBB.erase(MBBI);
}
}
projects / oota-llvm.git / blobdiff