1 //===- Thumb2InstrInfo.cpp - Thumb-2 Instruction Information --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the Thumb-2 implementation of the TargetInstrInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "Thumb2InstrInfo.h"
15 #include "ARMMachineFunctionInfo.h"
16 #include "MCTargetDesc/ARMAddressingModes.h"
17 #include "llvm/CodeGen/MachineBasicBlock.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstr.h"
21 #include "llvm/CodeGen/MachineInstrBuilder.h"
22 #include "llvm/CodeGen/MachineMemOperand.h"
23 #include "llvm/CodeGen/MachineOperand.h"
24 #include "llvm/CodeGen/MachineRegisterInfo.h"
25 #include "llvm/CodeGen/TargetRegisterInfo.h"
26 #include "llvm/IR/DebugLoc.h"
27 #include "llvm/MC/MCInst.h"
28 #include "llvm/MC/MCInstrDesc.h"
29 #include "llvm/Support/CommandLine.h"
30 #include "llvm/Support/ErrorHandling.h"
31 #include "llvm/Support/MathExtras.h"
32 #include "llvm/Target/TargetMachine.h"
38 OldT2IfCvt("old-thumb2-ifcvt", cl::Hidden,
39 cl::desc("Use old-style Thumb2 if-conversion heuristics"),
42 Thumb2InstrInfo::Thumb2InstrInfo(const ARMSubtarget &STI)
43 : ARMBaseInstrInfo(STI) {}
45 /// Return the noop instruction to use for a noop.
46 void Thumb2InstrInfo::getNoop(MCInst &NopInst) const {
47 NopInst.setOpcode(ARM::tHINT);
48 NopInst.addOperand(MCOperand::createImm(0));
49 NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
50 NopInst.addOperand(MCOperand::createReg(0));
53 unsigned Thumb2InstrInfo::getUnindexedOpcode(unsigned Opc) const {
59 Thumb2InstrInfo::ReplaceTailWithBranchTo(MachineBasicBlock::iterator Tail,
60 MachineBasicBlock *NewDest) const {
61 MachineBasicBlock *MBB = Tail->getParent();
62 ARMFunctionInfo *AFI = MBB->getParent()->getInfo<ARMFunctionInfo>();
63 if (!AFI->hasITBlocks() || Tail->isBranch()) {
64 TargetInstrInfo::ReplaceTailWithBranchTo(Tail, NewDest);
68 // If the first instruction of Tail is predicated, we may have to update
69 // the IT instruction.
71 ARMCC::CondCodes CC = getInstrPredicate(*Tail, PredReg);
72 MachineBasicBlock::iterator MBBI = Tail;
74 // Expecting at least the t2IT instruction before it.
77 // Actually replace the tail.
78 TargetInstrInfo::ReplaceTailWithBranchTo(Tail, NewDest);
81 if (CC != ARMCC::AL) {
82 MachineBasicBlock::iterator E = MBB->begin();
83 unsigned Count = 4; // At most 4 instructions in an IT block.
84 while (Count && MBBI != E) {
85 if (MBBI->isDebugInstr()) {
89 if (MBBI->getOpcode() == ARM::t2IT) {
90 unsigned Mask = MBBI->getOperand(1).getImm();
92 MBBI->eraseFromParent();
94 unsigned MaskOn = 1 << Count;
95 unsigned MaskOff = ~(MaskOn - 1);
96 MBBI->getOperand(1).setImm((Mask & MaskOff) | MaskOn);
104 // Ctrl flow can reach here if branch folding is run before IT block
110 Thumb2InstrInfo::isLegalToSplitMBBAt(MachineBasicBlock &MBB,
111 MachineBasicBlock::iterator MBBI) const {
112 while (MBBI->isDebugInstr()) {
114 if (MBBI == MBB.end())
118 unsigned PredReg = 0;
119 return getITInstrPredicate(*MBBI, PredReg) == ARMCC::AL;
122 void Thumb2InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
123 MachineBasicBlock::iterator I,
124 const DebugLoc &DL, unsigned DestReg,
125 unsigned SrcReg, bool KillSrc) const {
126 // Handle SPR, DPR, and QPR copies.
127 if (!ARM::GPRRegClass.contains(DestReg, SrcReg))
128 return ARMBaseInstrInfo::copyPhysReg(MBB, I, DL, DestReg, SrcReg, KillSrc);
130 BuildMI(MBB, I, DL, get(ARM::tMOVr), DestReg)
131 .addReg(SrcReg, getKillRegState(KillSrc))
132 .add(predOps(ARMCC::AL));
135 void Thumb2InstrInfo::
136 storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
137 unsigned SrcReg, bool isKill, int FI,
138 const TargetRegisterClass *RC,
139 const TargetRegisterInfo *TRI) const {
141 if (I != MBB.end()) DL = I->getDebugLoc();
143 MachineFunction &MF = *MBB.getParent();
144 MachineFrameInfo &MFI = MF.getFrameInfo();
145 MachineMemOperand *MMO = MF.getMachineMemOperand(
146 MachinePointerInfo::getFixedStack(MF, FI), MachineMemOperand::MOStore,
147 MFI.getObjectSize(FI), MFI.getObjectAlignment(FI));
149 if (RC == &ARM::GPRRegClass || RC == &ARM::tGPRRegClass ||
150 RC == &ARM::tcGPRRegClass || RC == &ARM::rGPRRegClass ||
151 RC == &ARM::GPRnopcRegClass) {
152 BuildMI(MBB, I, DL, get(ARM::t2STRi12))
153 .addReg(SrcReg, getKillRegState(isKill))
157 .add(predOps(ARMCC::AL));
161 if (ARM::GPRPairRegClass.hasSubClassEq(RC)) {
162 // Thumb2 STRD expects its dest-registers to be in rGPR. Not a problem for
163 // gsub_0, but needs an extra constraint for gsub_1 (which could be sp
165 if (TargetRegisterInfo::isVirtualRegister(SrcReg)) {
166 MachineRegisterInfo *MRI = &MF.getRegInfo();
167 MRI->constrainRegClass(SrcReg, &ARM::GPRPair_with_gsub_1_in_rGPRRegClass);
170 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(ARM::t2STRDi8));
171 AddDReg(MIB, SrcReg, ARM::gsub_0, getKillRegState(isKill), TRI);
172 AddDReg(MIB, SrcReg, ARM::gsub_1, 0, TRI);
173 MIB.addFrameIndex(FI).addImm(0).addMemOperand(MMO).add(predOps(ARMCC::AL));
177 ARMBaseInstrInfo::storeRegToStackSlot(MBB, I, SrcReg, isKill, FI, RC, TRI);
180 void Thumb2InstrInfo::
181 loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
182 unsigned DestReg, int FI,
183 const TargetRegisterClass *RC,
184 const TargetRegisterInfo *TRI) const {
185 MachineFunction &MF = *MBB.getParent();
186 MachineFrameInfo &MFI = MF.getFrameInfo();
187 MachineMemOperand *MMO = MF.getMachineMemOperand(
188 MachinePointerInfo::getFixedStack(MF, FI), MachineMemOperand::MOLoad,
189 MFI.getObjectSize(FI), MFI.getObjectAlignment(FI));
191 if (I != MBB.end()) DL = I->getDebugLoc();
193 if (RC == &ARM::GPRRegClass || RC == &ARM::tGPRRegClass ||
194 RC == &ARM::tcGPRRegClass || RC == &ARM::rGPRRegClass ||
195 RC == &ARM::GPRnopcRegClass) {
196 BuildMI(MBB, I, DL, get(ARM::t2LDRi12), DestReg)
200 .add(predOps(ARMCC::AL));
204 if (ARM::GPRPairRegClass.hasSubClassEq(RC)) {
205 // Thumb2 LDRD expects its dest-registers to be in rGPR. Not a problem for
206 // gsub_0, but needs an extra constraint for gsub_1 (which could be sp
208 if (TargetRegisterInfo::isVirtualRegister(DestReg)) {
209 MachineRegisterInfo *MRI = &MF.getRegInfo();
210 MRI->constrainRegClass(DestReg,
211 &ARM::GPRPair_with_gsub_1_in_rGPRRegClass);
214 MachineInstrBuilder MIB = BuildMI(MBB, I, DL, get(ARM::t2LDRDi8));
215 AddDReg(MIB, DestReg, ARM::gsub_0, RegState::DefineNoRead, TRI);
216 AddDReg(MIB, DestReg, ARM::gsub_1, RegState::DefineNoRead, TRI);
217 MIB.addFrameIndex(FI).addImm(0).addMemOperand(MMO).add(predOps(ARMCC::AL));
219 if (TargetRegisterInfo::isPhysicalRegister(DestReg))
220 MIB.addReg(DestReg, RegState::ImplicitDefine);
224 ARMBaseInstrInfo::loadRegFromStackSlot(MBB, I, DestReg, FI, RC, TRI);
227 void Thumb2InstrInfo::expandLoadStackGuard(
228 MachineBasicBlock::iterator MI) const {
229 MachineFunction &MF = *MI->getParent()->getParent();
230 if (MF.getTarget().isPositionIndependent())
231 expandLoadStackGuardBase(MI, ARM::t2MOV_ga_pcrel, ARM::t2LDRi12);
233 expandLoadStackGuardBase(MI, ARM::t2MOVi32imm, ARM::t2LDRi12);
236 void llvm::emitT2RegPlusImmediate(MachineBasicBlock &MBB,
237 MachineBasicBlock::iterator &MBBI,
238 const DebugLoc &dl, unsigned DestReg,
239 unsigned BaseReg, int NumBytes,
240 ARMCC::CondCodes Pred, unsigned PredReg,
241 const ARMBaseInstrInfo &TII,
243 if (NumBytes == 0 && DestReg != BaseReg) {
244 BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVr), DestReg)
245 .addReg(BaseReg, RegState::Kill)
246 .addImm((unsigned)Pred).addReg(PredReg).setMIFlags(MIFlags);
250 bool isSub = NumBytes < 0;
251 if (isSub) NumBytes = -NumBytes;
253 // If profitable, use a movw or movt to materialize the offset.
254 // FIXME: Use the scavenger to grab a scratch register.
255 if (DestReg != ARM::SP && DestReg != BaseReg &&
257 ARM_AM::getT2SOImmVal(NumBytes) == -1) {
259 if (NumBytes < 65536) {
260 // Use a movw to materialize the 16-bit constant.
261 BuildMI(MBB, MBBI, dl, TII.get(ARM::t2MOVi16), DestReg)
263 .addImm((unsigned)Pred).addReg(PredReg).setMIFlags(MIFlags);
265 } else if ((NumBytes & 0xffff) == 0) {
266 // Use a movt to materialize the 32-bit constant.
267 BuildMI(MBB, MBBI, dl, TII.get(ARM::t2MOVTi16), DestReg)
269 .addImm(NumBytes >> 16)
270 .addImm((unsigned)Pred).addReg(PredReg).setMIFlags(MIFlags);
276 BuildMI(MBB, MBBI, dl, TII.get(ARM::t2SUBrr), DestReg)
278 .addReg(DestReg, RegState::Kill)
279 .add(predOps(Pred, PredReg))
281 .setMIFlags(MIFlags);
283 // Here we know that DestReg is not SP but we do not
284 // know anything about BaseReg. t2ADDrr is an invalid
285 // instruction is SP is used as the second argument, but
286 // is fine if SP is the first argument. To be sure we
287 // do not generate invalid encoding, put BaseReg first.
288 BuildMI(MBB, MBBI, dl, TII.get(ARM::t2ADDrr), DestReg)
290 .addReg(DestReg, RegState::Kill)
291 .add(predOps(Pred, PredReg))
293 .setMIFlags(MIFlags);
300 unsigned ThisVal = NumBytes;
302 if (DestReg == ARM::SP && BaseReg != ARM::SP) {
303 // mov sp, rn. Note t2MOVr cannot be used.
304 BuildMI(MBB, MBBI, dl, TII.get(ARM::tMOVr), DestReg)
307 .add(predOps(ARMCC::AL));
312 bool HasCCOut = true;
313 if (BaseReg == ARM::SP) {
315 if (DestReg == ARM::SP && (ThisVal < ((1 << 7)-1) * 4)) {
316 assert((ThisVal & 3) == 0 && "Stack update is not multiple of 4?");
317 Opc = isSub ? ARM::tSUBspi : ARM::tADDspi;
318 BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
322 .add(predOps(ARMCC::AL));
327 // sub rd, sp, so_imm
328 Opc = isSub ? ARM::t2SUBri : ARM::t2ADDri;
329 if (ARM_AM::getT2SOImmVal(NumBytes) != -1) {
332 // FIXME: Move this to ARMAddressingModes.h?
333 unsigned RotAmt = countLeadingZeros(ThisVal);
334 ThisVal = ThisVal & ARM_AM::rotr32(0xff000000U, RotAmt);
335 NumBytes &= ~ThisVal;
336 assert(ARM_AM::getT2SOImmVal(ThisVal) != -1 &&
337 "Bit extraction didn't work?");
340 assert(DestReg != ARM::SP && BaseReg != ARM::SP);
341 Opc = isSub ? ARM::t2SUBri : ARM::t2ADDri;
342 if (ARM_AM::getT2SOImmVal(NumBytes) != -1) {
344 } else if (ThisVal < 4096) {
345 Opc = isSub ? ARM::t2SUBri12 : ARM::t2ADDri12;
349 // FIXME: Move this to ARMAddressingModes.h?
350 unsigned RotAmt = countLeadingZeros(ThisVal);
351 ThisVal = ThisVal & ARM_AM::rotr32(0xff000000U, RotAmt);
352 NumBytes &= ~ThisVal;
353 assert(ARM_AM::getT2SOImmVal(ThisVal) != -1 &&
354 "Bit extraction didn't work?");
358 // Build the new ADD / SUB.
359 MachineInstrBuilder MIB = BuildMI(MBB, MBBI, dl, TII.get(Opc), DestReg)
360 .addReg(BaseReg, RegState::Kill)
362 .add(predOps(ARMCC::AL))
363 .setMIFlags(MIFlags);
365 MIB.add(condCodeOp());
372 negativeOffsetOpcode(unsigned opcode)
375 case ARM::t2LDRi12: return ARM::t2LDRi8;
376 case ARM::t2LDRHi12: return ARM::t2LDRHi8;
377 case ARM::t2LDRBi12: return ARM::t2LDRBi8;
378 case ARM::t2LDRSHi12: return ARM::t2LDRSHi8;
379 case ARM::t2LDRSBi12: return ARM::t2LDRSBi8;
380 case ARM::t2STRi12: return ARM::t2STRi8;
381 case ARM::t2STRBi12: return ARM::t2STRBi8;
382 case ARM::t2STRHi12: return ARM::t2STRHi8;
383 case ARM::t2PLDi12: return ARM::t2PLDi8;
404 positiveOffsetOpcode(unsigned opcode)
407 case ARM::t2LDRi8: return ARM::t2LDRi12;
408 case ARM::t2LDRHi8: return ARM::t2LDRHi12;
409 case ARM::t2LDRBi8: return ARM::t2LDRBi12;
410 case ARM::t2LDRSHi8: return ARM::t2LDRSHi12;
411 case ARM::t2LDRSBi8: return ARM::t2LDRSBi12;
412 case ARM::t2STRi8: return ARM::t2STRi12;
413 case ARM::t2STRBi8: return ARM::t2STRBi12;
414 case ARM::t2STRHi8: return ARM::t2STRHi12;
415 case ARM::t2PLDi8: return ARM::t2PLDi12;
420 case ARM::t2LDRSHi12:
421 case ARM::t2LDRSBi12:
436 immediateOffsetOpcode(unsigned opcode)
439 case ARM::t2LDRs: return ARM::t2LDRi12;
440 case ARM::t2LDRHs: return ARM::t2LDRHi12;
441 case ARM::t2LDRBs: return ARM::t2LDRBi12;
442 case ARM::t2LDRSHs: return ARM::t2LDRSHi12;
443 case ARM::t2LDRSBs: return ARM::t2LDRSBi12;
444 case ARM::t2STRs: return ARM::t2STRi12;
445 case ARM::t2STRBs: return ARM::t2STRBi12;
446 case ARM::t2STRHs: return ARM::t2STRHi12;
447 case ARM::t2PLDs: return ARM::t2PLDi12;
452 case ARM::t2LDRSHi12:
453 case ARM::t2LDRSBi12:
476 bool llvm::rewriteT2FrameIndex(MachineInstr &MI, unsigned FrameRegIdx,
477 unsigned FrameReg, int &Offset,
478 const ARMBaseInstrInfo &TII) {
479 unsigned Opcode = MI.getOpcode();
480 const MCInstrDesc &Desc = MI.getDesc();
481 unsigned AddrMode = (Desc.TSFlags & ARMII::AddrModeMask);
484 // Memory operands in inline assembly always use AddrModeT2_i12.
485 if (Opcode == ARM::INLINEASM)
486 AddrMode = ARMII::AddrModeT2_i12; // FIXME. mode for thumb2?
488 if (Opcode == ARM::t2ADDri || Opcode == ARM::t2ADDri12) {
489 Offset += MI.getOperand(FrameRegIdx+1).getImm();
492 if (Offset == 0 && getInstrPredicate(MI, PredReg) == ARMCC::AL &&
493 !MI.definesRegister(ARM::CPSR)) {
494 // Turn it into a move.
495 MI.setDesc(TII.get(ARM::tMOVr));
496 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
497 // Remove offset and remaining explicit predicate operands.
498 do MI.RemoveOperand(FrameRegIdx+1);
499 while (MI.getNumOperands() > FrameRegIdx+1);
500 MachineInstrBuilder MIB(*MI.getParent()->getParent(), &MI);
501 MIB.add(predOps(ARMCC::AL));
505 bool HasCCOut = Opcode != ARM::t2ADDri12;
510 MI.setDesc(TII.get(ARM::t2SUBri));
512 MI.setDesc(TII.get(ARM::t2ADDri));
515 // Common case: small offset, fits into instruction.
516 if (ARM_AM::getT2SOImmVal(Offset) != -1) {
517 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
518 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
519 // Add cc_out operand if the original instruction did not have one.
521 MI.addOperand(MachineOperand::CreateReg(0, false));
525 // Another common case: imm12.
527 (!HasCCOut || MI.getOperand(MI.getNumOperands()-1).getReg() == 0)) {
528 unsigned NewOpc = isSub ? ARM::t2SUBri12 : ARM::t2ADDri12;
529 MI.setDesc(TII.get(NewOpc));
530 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
531 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(Offset);
532 // Remove the cc_out operand.
534 MI.RemoveOperand(MI.getNumOperands()-1);
539 // Otherwise, extract 8 adjacent bits from the immediate into this
541 unsigned RotAmt = countLeadingZeros<unsigned>(Offset);
542 unsigned ThisImmVal = Offset & ARM_AM::rotr32(0xff000000U, RotAmt);
544 // We will handle these bits from offset, clear them.
545 Offset &= ~ThisImmVal;
547 assert(ARM_AM::getT2SOImmVal(ThisImmVal) != -1 &&
548 "Bit extraction didn't work?");
549 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(ThisImmVal);
550 // Add cc_out operand if the original instruction did not have one.
552 MI.addOperand(MachineOperand::CreateReg(0, false));
554 // AddrMode4 and AddrMode6 cannot handle any offset.
555 if (AddrMode == ARMII::AddrMode4 || AddrMode == ARMII::AddrMode6)
558 // AddrModeT2_so cannot handle any offset. If there is no offset
559 // register then we change to an immediate version.
560 unsigned NewOpc = Opcode;
561 if (AddrMode == ARMII::AddrModeT2_so) {
562 unsigned OffsetReg = MI.getOperand(FrameRegIdx+1).getReg();
563 if (OffsetReg != 0) {
564 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
568 MI.RemoveOperand(FrameRegIdx+1);
569 MI.getOperand(FrameRegIdx+1).ChangeToImmediate(0);
570 NewOpc = immediateOffsetOpcode(Opcode);
571 AddrMode = ARMII::AddrModeT2_i12;
574 unsigned NumBits = 0;
576 if (AddrMode == ARMII::AddrModeT2_i8 || AddrMode == ARMII::AddrModeT2_i12) {
577 // i8 supports only negative, and i12 supports only positive, so
578 // based on Offset sign convert Opcode to the appropriate
580 Offset += MI.getOperand(FrameRegIdx+1).getImm();
582 NewOpc = negativeOffsetOpcode(Opcode);
587 NewOpc = positiveOffsetOpcode(Opcode);
590 } else if (AddrMode == ARMII::AddrMode5) {
592 const MachineOperand &OffOp = MI.getOperand(FrameRegIdx+1);
593 int InstrOffs = ARM_AM::getAM5Offset(OffOp.getImm());
594 if (ARM_AM::getAM5Op(OffOp.getImm()) == ARM_AM::sub)
598 Offset += InstrOffs * 4;
599 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
604 } else if (AddrMode == ARMII::AddrMode5FP16) {
606 const MachineOperand &OffOp = MI.getOperand(FrameRegIdx+1);
607 int InstrOffs = ARM_AM::getAM5FP16Offset(OffOp.getImm());
608 if (ARM_AM::getAM5FP16Op(OffOp.getImm()) == ARM_AM::sub)
612 Offset += InstrOffs * 2;
613 assert((Offset & (Scale-1)) == 0 && "Can't encode this offset!");
618 } else if (AddrMode == ARMII::AddrModeT2_i8s4) {
619 Offset += MI.getOperand(FrameRegIdx + 1).getImm() * 4;
620 NumBits = 10; // 8 bits scaled by 4
621 // MCInst operand expects already scaled value.
623 assert((Offset & 3) == 0 && "Can't encode this offset!");
624 } else if (AddrMode == ARMII::AddrModeT2_ldrex) {
625 Offset += MI.getOperand(FrameRegIdx + 1).getImm() * 4;
626 NumBits = 8; // 8 bits scaled by 4
628 assert((Offset & 3) == 0 && "Can't encode this offset!");
630 llvm_unreachable("Unsupported addressing mode!");
633 if (NewOpc != Opcode)
634 MI.setDesc(TII.get(NewOpc));
636 MachineOperand &ImmOp = MI.getOperand(FrameRegIdx+1);
638 // Attempt to fold address computation
639 // Common case: small offset, fits into instruction.
640 int ImmedOffset = Offset / Scale;
641 unsigned Mask = (1 << NumBits) - 1;
642 if ((unsigned)Offset <= Mask * Scale) {
643 // Replace the FrameIndex with fp/sp
644 MI.getOperand(FrameRegIdx).ChangeToRegister(FrameReg, false);
646 if (AddrMode == ARMII::AddrMode5)
647 // FIXME: Not consistent.
648 ImmedOffset |= 1 << NumBits;
650 ImmedOffset = -ImmedOffset;
652 ImmOp.ChangeToImmediate(ImmedOffset);
657 // Otherwise, offset doesn't fit. Pull in what we can to simplify
658 ImmedOffset = ImmedOffset & Mask;
660 if (AddrMode == ARMII::AddrMode5)
661 // FIXME: Not consistent.
662 ImmedOffset |= 1 << NumBits;
664 ImmedOffset = -ImmedOffset;
665 if (ImmedOffset == 0)
666 // Change the opcode back if the encoded offset is zero.
667 MI.setDesc(TII.get(positiveOffsetOpcode(NewOpc)));
670 ImmOp.ChangeToImmediate(ImmedOffset);
671 Offset &= ~(Mask*Scale);
674 Offset = (isSub) ? -Offset : Offset;
678 ARMCC::CondCodes llvm::getITInstrPredicate(const MachineInstr &MI,
680 unsigned Opc = MI.getOpcode();
681 if (Opc == ARM::tBcc || Opc == ARM::t2Bcc)
683 return getInstrPredicate(MI, PredReg);