1 //===-- MSP430ISelLowering.cpp - MSP430 DAG Lowering Implementation ------===//
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 implements the MSP430TargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "msp430-lower"
16 #include "MSP430ISelLowering.h"
18 #include "MSP430MachineFunctionInfo.h"
19 #include "MSP430TargetMachine.h"
20 #include "MSP430Subtarget.h"
21 #include "llvm/DerivedTypes.h"
22 #include "llvm/Function.h"
23 #include "llvm/Intrinsics.h"
24 #include "llvm/CallingConv.h"
25 #include "llvm/GlobalVariable.h"
26 #include "llvm/GlobalAlias.h"
27 #include "llvm/CodeGen/CallingConvLower.h"
28 #include "llvm/CodeGen/MachineFrameInfo.h"
29 #include "llvm/CodeGen/MachineFunction.h"
30 #include "llvm/CodeGen/MachineInstrBuilder.h"
31 #include "llvm/CodeGen/MachineRegisterInfo.h"
32 #include "llvm/CodeGen/SelectionDAGISel.h"
33 #include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
34 #include "llvm/CodeGen/ValueTypes.h"
35 #include "llvm/Support/CommandLine.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/raw_ostream.h"
47 static cl::opt<HWMultUseMode>
48 HWMultMode("msp430-hwmult-mode",
49 cl::desc("Hardware multiplier use mode"),
50 cl::init(HWMultNoIntr),
52 clEnumValN(NoHWMult, "no",
53 "Do not use hardware multiplier"),
54 clEnumValN(HWMultIntr, "interrupts",
55 "Assume hardware multiplier can be used inside interrupts"),
56 clEnumValN(HWMultNoIntr, "use",
57 "Assume hardware multiplier cannot be used inside interrupts"),
60 MSP430TargetLowering::MSP430TargetLowering(MSP430TargetMachine &tm) :
61 TargetLowering(tm, new TargetLoweringObjectFileELF()),
62 Subtarget(*tm.getSubtargetImpl()), TM(tm) {
66 // Set up the register classes.
67 addRegisterClass(MVT::i8, &MSP430::GR8RegClass);
68 addRegisterClass(MVT::i16, &MSP430::GR16RegClass);
70 // Compute derived properties from the register classes
71 computeRegisterProperties();
73 // Provide all sorts of operation actions
75 // Division is expensive
76 setIntDivIsCheap(false);
78 setStackPointerRegisterToSaveRestore(MSP430::SPW);
79 setBooleanContents(ZeroOrOneBooleanContent);
80 setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
82 // We have post-incremented loads / stores.
83 setIndexedLoadAction(ISD::POST_INC, MVT::i8, Legal);
84 setIndexedLoadAction(ISD::POST_INC, MVT::i16, Legal);
86 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
87 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
88 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
89 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
90 setLoadExtAction(ISD::SEXTLOAD, MVT::i16, Expand);
92 // We don't have any truncstores
93 setTruncStoreAction(MVT::i16, MVT::i8, Expand);
95 setOperationAction(ISD::SRA, MVT::i8, Custom);
96 setOperationAction(ISD::SHL, MVT::i8, Custom);
97 setOperationAction(ISD::SRL, MVT::i8, Custom);
98 setOperationAction(ISD::SRA, MVT::i16, Custom);
99 setOperationAction(ISD::SHL, MVT::i16, Custom);
100 setOperationAction(ISD::SRL, MVT::i16, Custom);
101 setOperationAction(ISD::ROTL, MVT::i8, Expand);
102 setOperationAction(ISD::ROTR, MVT::i8, Expand);
103 setOperationAction(ISD::ROTL, MVT::i16, Expand);
104 setOperationAction(ISD::ROTR, MVT::i16, Expand);
105 setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
106 setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom);
107 setOperationAction(ISD::BlockAddress, MVT::i16, Custom);
108 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
109 setOperationAction(ISD::BR_CC, MVT::i8, Custom);
110 setOperationAction(ISD::BR_CC, MVT::i16, Custom);
111 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
112 setOperationAction(ISD::SETCC, MVT::i8, Custom);
113 setOperationAction(ISD::SETCC, MVT::i16, Custom);
114 setOperationAction(ISD::SELECT, MVT::i8, Expand);
115 setOperationAction(ISD::SELECT, MVT::i16, Expand);
116 setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
117 setOperationAction(ISD::SELECT_CC, MVT::i16, Custom);
118 setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom);
119 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i8, Expand);
120 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i16, Expand);
122 setOperationAction(ISD::CTTZ, MVT::i8, Expand);
123 setOperationAction(ISD::CTTZ, MVT::i16, Expand);
124 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i8, Expand);
125 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i16, Expand);
126 setOperationAction(ISD::CTLZ, MVT::i8, Expand);
127 setOperationAction(ISD::CTLZ, MVT::i16, Expand);
128 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8, Expand);
129 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16, Expand);
130 setOperationAction(ISD::CTPOP, MVT::i8, Expand);
131 setOperationAction(ISD::CTPOP, MVT::i16, Expand);
133 setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand);
134 setOperationAction(ISD::SHL_PARTS, MVT::i16, Expand);
135 setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand);
136 setOperationAction(ISD::SRL_PARTS, MVT::i16, Expand);
137 setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand);
138 setOperationAction(ISD::SRA_PARTS, MVT::i16, Expand);
140 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
142 // FIXME: Implement efficiently multiplication by a constant
143 setOperationAction(ISD::MUL, MVT::i8, Expand);
144 setOperationAction(ISD::MULHS, MVT::i8, Expand);
145 setOperationAction(ISD::MULHU, MVT::i8, Expand);
146 setOperationAction(ISD::SMUL_LOHI, MVT::i8, Expand);
147 setOperationAction(ISD::UMUL_LOHI, MVT::i8, Expand);
148 setOperationAction(ISD::MUL, MVT::i16, Expand);
149 setOperationAction(ISD::MULHS, MVT::i16, Expand);
150 setOperationAction(ISD::MULHU, MVT::i16, Expand);
151 setOperationAction(ISD::SMUL_LOHI, MVT::i16, Expand);
152 setOperationAction(ISD::UMUL_LOHI, MVT::i16, Expand);
154 setOperationAction(ISD::UDIV, MVT::i8, Expand);
155 setOperationAction(ISD::UDIVREM, MVT::i8, Expand);
156 setOperationAction(ISD::UREM, MVT::i8, Expand);
157 setOperationAction(ISD::SDIV, MVT::i8, Expand);
158 setOperationAction(ISD::SDIVREM, MVT::i8, Expand);
159 setOperationAction(ISD::SREM, MVT::i8, Expand);
160 setOperationAction(ISD::UDIV, MVT::i16, Expand);
161 setOperationAction(ISD::UDIVREM, MVT::i16, Expand);
162 setOperationAction(ISD::UREM, MVT::i16, Expand);
163 setOperationAction(ISD::SDIV, MVT::i16, Expand);
164 setOperationAction(ISD::SDIVREM, MVT::i16, Expand);
165 setOperationAction(ISD::SREM, MVT::i16, Expand);
168 if (HWMultMode == HWMultIntr) {
169 setLibcallName(RTLIB::MUL_I8, "__mulqi3hw");
170 setLibcallName(RTLIB::MUL_I16, "__mulhi3hw");
171 } else if (HWMultMode == HWMultNoIntr) {
172 setLibcallName(RTLIB::MUL_I8, "__mulqi3hw_noint");
173 setLibcallName(RTLIB::MUL_I16, "__mulhi3hw_noint");
176 setMinFunctionAlignment(1);
177 setPrefFunctionAlignment(2);
180 SDValue MSP430TargetLowering::LowerOperation(SDValue Op,
181 SelectionDAG &DAG) const {
182 switch (Op.getOpcode()) {
183 case ISD::SHL: // FALLTHROUGH
185 case ISD::SRA: return LowerShifts(Op, DAG);
186 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
187 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
188 case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG);
189 case ISD::SETCC: return LowerSETCC(Op, DAG);
190 case ISD::BR_CC: return LowerBR_CC(Op, DAG);
191 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
192 case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, DAG);
193 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
194 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
196 llvm_unreachable("unimplemented operand");
200 //===----------------------------------------------------------------------===//
201 // MSP430 Inline Assembly Support
202 //===----------------------------------------------------------------------===//
204 /// getConstraintType - Given a constraint letter, return the type of
205 /// constraint it is for this target.
206 TargetLowering::ConstraintType
207 MSP430TargetLowering::getConstraintType(const std::string &Constraint) const {
208 if (Constraint.size() == 1) {
209 switch (Constraint[0]) {
211 return C_RegisterClass;
216 return TargetLowering::getConstraintType(Constraint);
219 std::pair<unsigned, const TargetRegisterClass*>
220 MSP430TargetLowering::
221 getRegForInlineAsmConstraint(const std::string &Constraint,
223 if (Constraint.size() == 1) {
224 // GCC Constraint Letters
225 switch (Constraint[0]) {
227 case 'r': // GENERAL_REGS
229 return std::make_pair(0U, &MSP430::GR8RegClass);
231 return std::make_pair(0U, &MSP430::GR16RegClass);
235 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
238 //===----------------------------------------------------------------------===//
239 // Calling Convention Implementation
240 //===----------------------------------------------------------------------===//
242 #include "MSP430GenCallingConv.inc"
245 MSP430TargetLowering::LowerFormalArguments(SDValue Chain,
246 CallingConv::ID CallConv,
248 const SmallVectorImpl<ISD::InputArg>
252 SmallVectorImpl<SDValue> &InVals)
257 llvm_unreachable("Unsupported calling convention");
259 case CallingConv::Fast:
260 return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals);
261 case CallingConv::MSP430_INTR:
264 report_fatal_error("ISRs cannot have arguments");
269 MSP430TargetLowering::LowerCall(SDValue Chain, SDValue Callee,
270 CallingConv::ID CallConv, bool isVarArg,
271 bool doesNotRet, bool &isTailCall,
272 const SmallVectorImpl<ISD::OutputArg> &Outs,
273 const SmallVectorImpl<SDValue> &OutVals,
274 const SmallVectorImpl<ISD::InputArg> &Ins,
275 DebugLoc dl, SelectionDAG &DAG,
276 SmallVectorImpl<SDValue> &InVals) const {
277 // MSP430 target does not yet support tail call optimization.
282 llvm_unreachable("Unsupported calling convention");
283 case CallingConv::Fast:
285 return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall,
286 Outs, OutVals, Ins, dl, DAG, InVals);
287 case CallingConv::MSP430_INTR:
288 report_fatal_error("ISRs cannot be called directly");
292 /// LowerCCCArguments - transform physical registers into virtual registers and
293 /// generate load operations for arguments places on the stack.
294 // FIXME: struct return stuff
297 MSP430TargetLowering::LowerCCCArguments(SDValue Chain,
298 CallingConv::ID CallConv,
300 const SmallVectorImpl<ISD::InputArg>
304 SmallVectorImpl<SDValue> &InVals)
306 MachineFunction &MF = DAG.getMachineFunction();
307 MachineFrameInfo *MFI = MF.getFrameInfo();
308 MachineRegisterInfo &RegInfo = MF.getRegInfo();
310 // Assign locations to all of the incoming arguments.
311 SmallVector<CCValAssign, 16> ArgLocs;
312 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
313 getTargetMachine(), ArgLocs, *DAG.getContext());
314 CCInfo.AnalyzeFormalArguments(Ins, CC_MSP430);
316 assert(!isVarArg && "Varargs not supported yet");
318 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
319 CCValAssign &VA = ArgLocs[i];
321 // Arguments passed in registers
322 EVT RegVT = VA.getLocVT();
323 switch (RegVT.getSimpleVT().SimpleTy) {
327 errs() << "LowerFormalArguments Unhandled argument type: "
328 << RegVT.getSimpleVT().SimpleTy << "\n";
333 unsigned VReg = RegInfo.createVirtualRegister(&MSP430::GR16RegClass);
334 RegInfo.addLiveIn(VA.getLocReg(), VReg);
335 SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, RegVT);
337 // If this is an 8-bit value, it is really passed promoted to 16
338 // bits. Insert an assert[sz]ext to capture this, then truncate to the
340 if (VA.getLocInfo() == CCValAssign::SExt)
341 ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
342 DAG.getValueType(VA.getValVT()));
343 else if (VA.getLocInfo() == CCValAssign::ZExt)
344 ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
345 DAG.getValueType(VA.getValVT()));
347 if (VA.getLocInfo() != CCValAssign::Full)
348 ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
350 InVals.push_back(ArgValue);
354 assert(VA.isMemLoc());
355 // Load the argument to a virtual register
356 unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
358 errs() << "LowerFormalArguments Unhandled argument type: "
359 << EVT(VA.getLocVT()).getEVTString()
362 // Create the frame index object for this incoming parameter...
363 int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
365 // Create the SelectionDAG nodes corresponding to a load
366 //from this parameter
367 SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
368 InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
369 MachinePointerInfo::getFixedStack(FI),
370 false, false, false, 0));
378 MSP430TargetLowering::LowerReturn(SDValue Chain,
379 CallingConv::ID CallConv, bool isVarArg,
380 const SmallVectorImpl<ISD::OutputArg> &Outs,
381 const SmallVectorImpl<SDValue> &OutVals,
382 DebugLoc dl, SelectionDAG &DAG) const {
384 // CCValAssign - represent the assignment of the return value to a location
385 SmallVector<CCValAssign, 16> RVLocs;
387 // ISRs cannot return any value.
388 if (CallConv == CallingConv::MSP430_INTR && !Outs.empty())
389 report_fatal_error("ISRs cannot return any value");
391 // CCState - Info about the registers and stack slot.
392 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
393 getTargetMachine(), RVLocs, *DAG.getContext());
395 // Analize return values.
396 CCInfo.AnalyzeReturn(Outs, RetCC_MSP430);
398 // If this is the first return lowered for this function, add the regs to the
399 // liveout set for the function.
400 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
401 for (unsigned i = 0; i != RVLocs.size(); ++i)
402 if (RVLocs[i].isRegLoc())
403 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
408 // Copy the result values into the output registers.
409 for (unsigned i = 0; i != RVLocs.size(); ++i) {
410 CCValAssign &VA = RVLocs[i];
411 assert(VA.isRegLoc() && "Can only return in registers!");
413 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
416 // Guarantee that all emitted copies are stuck together,
417 // avoiding something bad.
418 Flag = Chain.getValue(1);
421 unsigned Opc = (CallConv == CallingConv::MSP430_INTR ?
422 MSP430ISD::RETI_FLAG : MSP430ISD::RET_FLAG);
425 return DAG.getNode(Opc, dl, MVT::Other, Chain, Flag);
428 return DAG.getNode(Opc, dl, MVT::Other, Chain);
431 /// LowerCCCCallTo - functions arguments are copied from virtual regs to
432 /// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
435 MSP430TargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
436 CallingConv::ID CallConv, bool isVarArg,
438 const SmallVectorImpl<ISD::OutputArg>
440 const SmallVectorImpl<SDValue> &OutVals,
441 const SmallVectorImpl<ISD::InputArg> &Ins,
442 DebugLoc dl, SelectionDAG &DAG,
443 SmallVectorImpl<SDValue> &InVals) const {
444 // Analyze operands of the call, assigning locations to each operand.
445 SmallVector<CCValAssign, 16> ArgLocs;
446 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
447 getTargetMachine(), ArgLocs, *DAG.getContext());
449 CCInfo.AnalyzeCallOperands(Outs, CC_MSP430);
451 // Get a count of how many bytes are to be pushed on the stack.
452 unsigned NumBytes = CCInfo.getNextStackOffset();
454 Chain = DAG.getCALLSEQ_START(Chain ,DAG.getConstant(NumBytes,
455 getPointerTy(), true));
457 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
458 SmallVector<SDValue, 12> MemOpChains;
461 // Walk the register/memloc assignments, inserting copies/loads.
462 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
463 CCValAssign &VA = ArgLocs[i];
465 SDValue Arg = OutVals[i];
467 // Promote the value if needed.
468 switch (VA.getLocInfo()) {
469 default: llvm_unreachable("Unknown loc info!");
470 case CCValAssign::Full: break;
471 case CCValAssign::SExt:
472 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
474 case CCValAssign::ZExt:
475 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
477 case CCValAssign::AExt:
478 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
482 // Arguments that can be passed on register must be kept at RegsToPass
485 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
487 assert(VA.isMemLoc());
489 if (StackPtr.getNode() == 0)
490 StackPtr = DAG.getCopyFromReg(Chain, dl, MSP430::SPW, getPointerTy());
492 SDValue PtrOff = DAG.getNode(ISD::ADD, dl, getPointerTy(),
494 DAG.getIntPtrConstant(VA.getLocMemOffset()));
497 MemOpChains.push_back(DAG.getStore(Chain, dl, Arg, PtrOff,
498 MachinePointerInfo(),false, false, 0));
502 // Transform all store nodes into one single node because all store nodes are
503 // independent of each other.
504 if (!MemOpChains.empty())
505 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
506 &MemOpChains[0], MemOpChains.size());
508 // Build a sequence of copy-to-reg nodes chained together with token chain and
509 // flag operands which copy the outgoing args into registers. The InFlag in
510 // necessary since all emitted instructions must be stuck together.
512 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
513 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
514 RegsToPass[i].second, InFlag);
515 InFlag = Chain.getValue(1);
518 // If the callee is a GlobalAddress node (quite common, every direct call is)
519 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
520 // Likewise ExternalSymbol -> TargetExternalSymbol.
521 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
522 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i16);
523 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
524 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i16);
526 // Returns a chain & a flag for retval copy to use.
527 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
528 SmallVector<SDValue, 8> Ops;
529 Ops.push_back(Chain);
530 Ops.push_back(Callee);
532 // Add argument registers to the end of the list so that they are
533 // known live into the call.
534 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
535 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
536 RegsToPass[i].second.getValueType()));
538 if (InFlag.getNode())
539 Ops.push_back(InFlag);
541 Chain = DAG.getNode(MSP430ISD::CALL, dl, NodeTys, &Ops[0], Ops.size());
542 InFlag = Chain.getValue(1);
544 // Create the CALLSEQ_END node.
545 Chain = DAG.getCALLSEQ_END(Chain,
546 DAG.getConstant(NumBytes, getPointerTy(), true),
547 DAG.getConstant(0, getPointerTy(), true),
549 InFlag = Chain.getValue(1);
551 // Handle result values, copying them out of physregs into vregs that we
553 return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl,
557 /// LowerCallResult - Lower the result values of a call into the
558 /// appropriate copies out of appropriate physical registers.
561 MSP430TargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
562 CallingConv::ID CallConv, bool isVarArg,
563 const SmallVectorImpl<ISD::InputArg> &Ins,
564 DebugLoc dl, SelectionDAG &DAG,
565 SmallVectorImpl<SDValue> &InVals) const {
567 // Assign locations to each value returned by this call.
568 SmallVector<CCValAssign, 16> RVLocs;
569 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
570 getTargetMachine(), RVLocs, *DAG.getContext());
572 CCInfo.AnalyzeCallResult(Ins, RetCC_MSP430);
574 // Copy all of the result registers out of their specified physreg.
575 for (unsigned i = 0; i != RVLocs.size(); ++i) {
576 Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
577 RVLocs[i].getValVT(), InFlag).getValue(1);
578 InFlag = Chain.getValue(2);
579 InVals.push_back(Chain.getValue(0));
585 SDValue MSP430TargetLowering::LowerShifts(SDValue Op,
586 SelectionDAG &DAG) const {
587 unsigned Opc = Op.getOpcode();
588 SDNode* N = Op.getNode();
589 EVT VT = Op.getValueType();
590 DebugLoc dl = N->getDebugLoc();
592 // Expand non-constant shifts to loops:
593 if (!isa<ConstantSDNode>(N->getOperand(1)))
595 default: llvm_unreachable("Invalid shift opcode!");
597 return DAG.getNode(MSP430ISD::SHL, dl,
598 VT, N->getOperand(0), N->getOperand(1));
600 return DAG.getNode(MSP430ISD::SRA, dl,
601 VT, N->getOperand(0), N->getOperand(1));
603 return DAG.getNode(MSP430ISD::SRL, dl,
604 VT, N->getOperand(0), N->getOperand(1));
607 uint64_t ShiftAmount = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
609 // Expand the stuff into sequence of shifts.
610 // FIXME: for some shift amounts this might be done better!
611 // E.g.: foo >> (8 + N) => sxt(swpb(foo)) >> N
612 SDValue Victim = N->getOperand(0);
614 if (Opc == ISD::SRL && ShiftAmount) {
615 // Emit a special goodness here:
616 // srl A, 1 => clrc; rrc A
617 Victim = DAG.getNode(MSP430ISD::RRC, dl, VT, Victim);
621 while (ShiftAmount--)
622 Victim = DAG.getNode((Opc == ISD::SHL ? MSP430ISD::RLA : MSP430ISD::RRA),
628 SDValue MSP430TargetLowering::LowerGlobalAddress(SDValue Op,
629 SelectionDAG &DAG) const {
630 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
631 int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
633 // Create the TargetGlobalAddress node, folding in the constant offset.
634 SDValue Result = DAG.getTargetGlobalAddress(GV, Op.getDebugLoc(),
635 getPointerTy(), Offset);
636 return DAG.getNode(MSP430ISD::Wrapper, Op.getDebugLoc(),
637 getPointerTy(), Result);
640 SDValue MSP430TargetLowering::LowerExternalSymbol(SDValue Op,
641 SelectionDAG &DAG) const {
642 DebugLoc dl = Op.getDebugLoc();
643 const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol();
644 SDValue Result = DAG.getTargetExternalSymbol(Sym, getPointerTy());
646 return DAG.getNode(MSP430ISD::Wrapper, dl, getPointerTy(), Result);
649 SDValue MSP430TargetLowering::LowerBlockAddress(SDValue Op,
650 SelectionDAG &DAG) const {
651 DebugLoc dl = Op.getDebugLoc();
652 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
653 SDValue Result = DAG.getBlockAddress(BA, getPointerTy(), /*isTarget=*/true);
655 return DAG.getNode(MSP430ISD::Wrapper, dl, getPointerTy(), Result);
658 static SDValue EmitCMP(SDValue &LHS, SDValue &RHS, SDValue &TargetCC,
660 DebugLoc dl, SelectionDAG &DAG) {
661 // FIXME: Handle bittests someday
662 assert(!LHS.getValueType().isFloatingPoint() && "We don't handle FP yet");
664 // FIXME: Handle jump negative someday
665 MSP430CC::CondCodes TCC = MSP430CC::COND_INVALID;
667 default: llvm_unreachable("Invalid integer condition!");
669 TCC = MSP430CC::COND_E; // aka COND_Z
670 // Minor optimization: if LHS is a constant, swap operands, then the
671 // constant can be folded into comparison.
672 if (LHS.getOpcode() == ISD::Constant)
676 TCC = MSP430CC::COND_NE; // aka COND_NZ
677 // Minor optimization: if LHS is a constant, swap operands, then the
678 // constant can be folded into comparison.
679 if (LHS.getOpcode() == ISD::Constant)
683 std::swap(LHS, RHS); // FALLTHROUGH
685 // Turn lhs u>= rhs with lhs constant into rhs u< lhs+1, this allows us to
686 // fold constant into instruction.
687 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
689 RHS = DAG.getConstant(C->getSExtValue() + 1, C->getValueType(0));
690 TCC = MSP430CC::COND_LO;
693 TCC = MSP430CC::COND_HS; // aka COND_C
696 std::swap(LHS, RHS); // FALLTHROUGH
698 // Turn lhs u< rhs with lhs constant into rhs u>= lhs+1, this allows us to
699 // fold constant into instruction.
700 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
702 RHS = DAG.getConstant(C->getSExtValue() + 1, C->getValueType(0));
703 TCC = MSP430CC::COND_HS;
706 TCC = MSP430CC::COND_LO; // aka COND_NC
709 std::swap(LHS, RHS); // FALLTHROUGH
711 // Turn lhs >= rhs with lhs constant into rhs < lhs+1, this allows us to
712 // fold constant into instruction.
713 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
715 RHS = DAG.getConstant(C->getSExtValue() + 1, C->getValueType(0));
716 TCC = MSP430CC::COND_L;
719 TCC = MSP430CC::COND_GE;
722 std::swap(LHS, RHS); // FALLTHROUGH
724 // Turn lhs < rhs with lhs constant into rhs >= lhs+1, this allows us to
725 // fold constant into instruction.
726 if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
728 RHS = DAG.getConstant(C->getSExtValue() + 1, C->getValueType(0));
729 TCC = MSP430CC::COND_GE;
732 TCC = MSP430CC::COND_L;
736 TargetCC = DAG.getConstant(TCC, MVT::i8);
737 return DAG.getNode(MSP430ISD::CMP, dl, MVT::Glue, LHS, RHS);
741 SDValue MSP430TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
742 SDValue Chain = Op.getOperand(0);
743 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
744 SDValue LHS = Op.getOperand(2);
745 SDValue RHS = Op.getOperand(3);
746 SDValue Dest = Op.getOperand(4);
747 DebugLoc dl = Op.getDebugLoc();
750 SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
752 return DAG.getNode(MSP430ISD::BR_CC, dl, Op.getValueType(),
753 Chain, Dest, TargetCC, Flag);
756 SDValue MSP430TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
757 SDValue LHS = Op.getOperand(0);
758 SDValue RHS = Op.getOperand(1);
759 DebugLoc dl = Op.getDebugLoc();
761 // If we are doing an AND and testing against zero, then the CMP
762 // will not be generated. The AND (or BIT) will generate the condition codes,
763 // but they are different from CMP.
764 // FIXME: since we're doing a post-processing, use a pseudoinstr here, so
765 // lowering & isel wouldn't diverge.
767 if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
768 if (RHSC->isNullValue() && LHS.hasOneUse() &&
769 (LHS.getOpcode() == ISD::AND ||
770 (LHS.getOpcode() == ISD::TRUNCATE &&
771 LHS.getOperand(0).getOpcode() == ISD::AND))) {
775 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
777 SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
779 // Get the condition codes directly from the status register, if its easy.
780 // Otherwise a branch will be generated. Note that the AND and BIT
781 // instructions generate different flags than CMP, the carry bit can be used
786 switch (cast<ConstantSDNode>(TargetCC)->getZExtValue()) {
790 case MSP430CC::COND_HS:
791 // Res = SRW & 1, no processing is required
793 case MSP430CC::COND_LO:
797 case MSP430CC::COND_NE:
799 // C = ~Z, thus Res = SRW & 1, no processing is required
801 // Res = ~((SRW >> 1) & 1)
806 case MSP430CC::COND_E:
808 // C = ~Z for AND instruction, thus we can put Res = ~(SRW & 1), however,
809 // Res = (SRW >> 1) & 1 is 1 word shorter.
812 EVT VT = Op.getValueType();
813 SDValue One = DAG.getConstant(1, VT);
815 SDValue SR = DAG.getCopyFromReg(DAG.getEntryNode(), dl, MSP430::SRW,
818 // FIXME: somewhere this is turned into a SRL, lower it MSP specific?
819 SR = DAG.getNode(ISD::SRA, dl, MVT::i16, SR, One);
820 SR = DAG.getNode(ISD::AND, dl, MVT::i16, SR, One);
822 SR = DAG.getNode(ISD::XOR, dl, MVT::i16, SR, One);
825 SDValue Zero = DAG.getConstant(0, VT);
826 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
827 SmallVector<SDValue, 4> Ops;
830 Ops.push_back(TargetCC);
832 return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, &Ops[0], Ops.size());
836 SDValue MSP430TargetLowering::LowerSELECT_CC(SDValue Op,
837 SelectionDAG &DAG) const {
838 SDValue LHS = Op.getOperand(0);
839 SDValue RHS = Op.getOperand(1);
840 SDValue TrueV = Op.getOperand(2);
841 SDValue FalseV = Op.getOperand(3);
842 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
843 DebugLoc dl = Op.getDebugLoc();
846 SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
848 SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
849 SmallVector<SDValue, 4> Ops;
850 Ops.push_back(TrueV);
851 Ops.push_back(FalseV);
852 Ops.push_back(TargetCC);
855 return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, &Ops[0], Ops.size());
858 SDValue MSP430TargetLowering::LowerSIGN_EXTEND(SDValue Op,
859 SelectionDAG &DAG) const {
860 SDValue Val = Op.getOperand(0);
861 EVT VT = Op.getValueType();
862 DebugLoc dl = Op.getDebugLoc();
864 assert(VT == MVT::i16 && "Only support i16 for now!");
866 return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT,
867 DAG.getNode(ISD::ANY_EXTEND, dl, VT, Val),
868 DAG.getValueType(Val.getValueType()));
872 MSP430TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const {
873 MachineFunction &MF = DAG.getMachineFunction();
874 MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
875 int ReturnAddrIndex = FuncInfo->getRAIndex();
877 if (ReturnAddrIndex == 0) {
878 // Set up a frame object for the return address.
879 uint64_t SlotSize = TD->getPointerSize();
880 ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize, -SlotSize,
882 FuncInfo->setRAIndex(ReturnAddrIndex);
885 return DAG.getFrameIndex(ReturnAddrIndex, getPointerTy());
888 SDValue MSP430TargetLowering::LowerRETURNADDR(SDValue Op,
889 SelectionDAG &DAG) const {
890 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
891 MFI->setReturnAddressIsTaken(true);
893 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
894 DebugLoc dl = Op.getDebugLoc();
897 SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
899 DAG.getConstant(TD->getPointerSize(), MVT::i16);
900 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
901 DAG.getNode(ISD::ADD, dl, getPointerTy(),
903 MachinePointerInfo(), false, false, false, 0);
906 // Just load the return address.
907 SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
908 return DAG.getLoad(getPointerTy(), dl, DAG.getEntryNode(),
909 RetAddrFI, MachinePointerInfo(), false, false, false, 0);
912 SDValue MSP430TargetLowering::LowerFRAMEADDR(SDValue Op,
913 SelectionDAG &DAG) const {
914 MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
915 MFI->setFrameAddressIsTaken(true);
917 EVT VT = Op.getValueType();
918 DebugLoc dl = Op.getDebugLoc(); // FIXME probably not meaningful
919 unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
920 SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl,
923 FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
924 MachinePointerInfo(),
925 false, false, false, 0);
929 /// getPostIndexedAddressParts - returns true by value, base pointer and
930 /// offset pointer and addressing mode by reference if this node can be
931 /// combined with a load / store to form a post-indexed load / store.
932 bool MSP430TargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
935 ISD::MemIndexedMode &AM,
936 SelectionDAG &DAG) const {
938 LoadSDNode *LD = cast<LoadSDNode>(N);
939 if (LD->getExtensionType() != ISD::NON_EXTLOAD)
942 EVT VT = LD->getMemoryVT();
943 if (VT != MVT::i8 && VT != MVT::i16)
946 if (Op->getOpcode() != ISD::ADD)
949 if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Op->getOperand(1))) {
950 uint64_t RHSC = RHS->getZExtValue();
951 if ((VT == MVT::i16 && RHSC != 2) ||
952 (VT == MVT::i8 && RHSC != 1))
955 Base = Op->getOperand(0);
956 Offset = DAG.getConstant(RHSC, VT);
965 const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const {
967 default: return NULL;
968 case MSP430ISD::RET_FLAG: return "MSP430ISD::RET_FLAG";
969 case MSP430ISD::RETI_FLAG: return "MSP430ISD::RETI_FLAG";
970 case MSP430ISD::RRA: return "MSP430ISD::RRA";
971 case MSP430ISD::RLA: return "MSP430ISD::RLA";
972 case MSP430ISD::RRC: return "MSP430ISD::RRC";
973 case MSP430ISD::CALL: return "MSP430ISD::CALL";
974 case MSP430ISD::Wrapper: return "MSP430ISD::Wrapper";
975 case MSP430ISD::BR_CC: return "MSP430ISD::BR_CC";
976 case MSP430ISD::CMP: return "MSP430ISD::CMP";
977 case MSP430ISD::SELECT_CC: return "MSP430ISD::SELECT_CC";
978 case MSP430ISD::SHL: return "MSP430ISD::SHL";
979 case MSP430ISD::SRA: return "MSP430ISD::SRA";
983 bool MSP430TargetLowering::isTruncateFree(Type *Ty1,
985 if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
988 return (Ty1->getPrimitiveSizeInBits() > Ty2->getPrimitiveSizeInBits());
991 bool MSP430TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
992 if (!VT1.isInteger() || !VT2.isInteger())
995 return (VT1.getSizeInBits() > VT2.getSizeInBits());
998 bool MSP430TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
999 // MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
1000 return 0 && Ty1->isIntegerTy(8) && Ty2->isIntegerTy(16);
1003 bool MSP430TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
1004 // MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
1005 return 0 && VT1 == MVT::i8 && VT2 == MVT::i16;
1008 //===----------------------------------------------------------------------===//
1009 // Other Lowering Code
1010 //===----------------------------------------------------------------------===//
1013 MSP430TargetLowering::EmitShiftInstr(MachineInstr *MI,
1014 MachineBasicBlock *BB) const {
1015 MachineFunction *F = BB->getParent();
1016 MachineRegisterInfo &RI = F->getRegInfo();
1017 DebugLoc dl = MI->getDebugLoc();
1018 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
1021 const TargetRegisterClass * RC;
1022 switch (MI->getOpcode()) {
1023 default: llvm_unreachable("Invalid shift opcode!");
1025 Opc = MSP430::SHL8r1;
1026 RC = &MSP430::GR8RegClass;
1029 Opc = MSP430::SHL16r1;
1030 RC = &MSP430::GR16RegClass;
1033 Opc = MSP430::SAR8r1;
1034 RC = &MSP430::GR8RegClass;
1037 Opc = MSP430::SAR16r1;
1038 RC = &MSP430::GR16RegClass;
1041 Opc = MSP430::SAR8r1c;
1042 RC = &MSP430::GR8RegClass;
1045 Opc = MSP430::SAR16r1c;
1046 RC = &MSP430::GR16RegClass;
1050 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1051 MachineFunction::iterator I = BB;
1054 // Create loop block
1055 MachineBasicBlock *LoopBB = F->CreateMachineBasicBlock(LLVM_BB);
1056 MachineBasicBlock *RemBB = F->CreateMachineBasicBlock(LLVM_BB);
1058 F->insert(I, LoopBB);
1059 F->insert(I, RemBB);
1061 // Update machine-CFG edges by transferring all successors of the current
1062 // block to the block containing instructions after shift.
1063 RemBB->splice(RemBB->begin(), BB,
1064 llvm::next(MachineBasicBlock::iterator(MI)),
1066 RemBB->transferSuccessorsAndUpdatePHIs(BB);
1068 // Add adges BB => LoopBB => RemBB, BB => RemBB, LoopBB => LoopBB
1069 BB->addSuccessor(LoopBB);
1070 BB->addSuccessor(RemBB);
1071 LoopBB->addSuccessor(RemBB);
1072 LoopBB->addSuccessor(LoopBB);
1074 unsigned ShiftAmtReg = RI.createVirtualRegister(&MSP430::GR8RegClass);
1075 unsigned ShiftAmtReg2 = RI.createVirtualRegister(&MSP430::GR8RegClass);
1076 unsigned ShiftReg = RI.createVirtualRegister(RC);
1077 unsigned ShiftReg2 = RI.createVirtualRegister(RC);
1078 unsigned ShiftAmtSrcReg = MI->getOperand(2).getReg();
1079 unsigned SrcReg = MI->getOperand(1).getReg();
1080 unsigned DstReg = MI->getOperand(0).getReg();
1085 BuildMI(BB, dl, TII.get(MSP430::CMP8ri))
1086 .addReg(ShiftAmtSrcReg).addImm(0);
1087 BuildMI(BB, dl, TII.get(MSP430::JCC))
1089 .addImm(MSP430CC::COND_E);
1092 // ShiftReg = phi [%SrcReg, BB], [%ShiftReg2, LoopBB]
1093 // ShiftAmt = phi [%N, BB], [%ShiftAmt2, LoopBB]
1094 // ShiftReg2 = shift ShiftReg
1095 // ShiftAmt2 = ShiftAmt - 1;
1096 BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftReg)
1097 .addReg(SrcReg).addMBB(BB)
1098 .addReg(ShiftReg2).addMBB(LoopBB);
1099 BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftAmtReg)
1100 .addReg(ShiftAmtSrcReg).addMBB(BB)
1101 .addReg(ShiftAmtReg2).addMBB(LoopBB);
1102 BuildMI(LoopBB, dl, TII.get(Opc), ShiftReg2)
1104 BuildMI(LoopBB, dl, TII.get(MSP430::SUB8ri), ShiftAmtReg2)
1105 .addReg(ShiftAmtReg).addImm(1);
1106 BuildMI(LoopBB, dl, TII.get(MSP430::JCC))
1108 .addImm(MSP430CC::COND_NE);
1111 // DestReg = phi [%SrcReg, BB], [%ShiftReg, LoopBB]
1112 BuildMI(*RemBB, RemBB->begin(), dl, TII.get(MSP430::PHI), DstReg)
1113 .addReg(SrcReg).addMBB(BB)
1114 .addReg(ShiftReg2).addMBB(LoopBB);
1116 MI->eraseFromParent(); // The pseudo instruction is gone now.
1121 MSP430TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1122 MachineBasicBlock *BB) const {
1123 unsigned Opc = MI->getOpcode();
1125 if (Opc == MSP430::Shl8 || Opc == MSP430::Shl16 ||
1126 Opc == MSP430::Sra8 || Opc == MSP430::Sra16 ||
1127 Opc == MSP430::Srl8 || Opc == MSP430::Srl16)
1128 return EmitShiftInstr(MI, BB);
1130 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
1131 DebugLoc dl = MI->getDebugLoc();
1133 assert((Opc == MSP430::Select16 || Opc == MSP430::Select8) &&
1134 "Unexpected instr type to insert");
1136 // To "insert" a SELECT instruction, we actually have to insert the diamond
1137 // control-flow pattern. The incoming instruction knows the destination vreg
1138 // to set, the condition code register to branch on, the true/false values to
1139 // select between, and a branch opcode to use.
1140 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1141 MachineFunction::iterator I = BB;
1147 // cmpTY ccX, r1, r2
1149 // fallthrough --> copy0MBB
1150 MachineBasicBlock *thisMBB = BB;
1151 MachineFunction *F = BB->getParent();
1152 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1153 MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
1154 F->insert(I, copy0MBB);
1155 F->insert(I, copy1MBB);
1156 // Update machine-CFG edges by transferring all successors of the current
1157 // block to the new block which will contain the Phi node for the select.
1158 copy1MBB->splice(copy1MBB->begin(), BB,
1159 llvm::next(MachineBasicBlock::iterator(MI)),
1161 copy1MBB->transferSuccessorsAndUpdatePHIs(BB);
1162 // Next, add the true and fallthrough blocks as its successors.
1163 BB->addSuccessor(copy0MBB);
1164 BB->addSuccessor(copy1MBB);
1166 BuildMI(BB, dl, TII.get(MSP430::JCC))
1168 .addImm(MI->getOperand(3).getImm());
1171 // %FalseValue = ...
1172 // # fallthrough to copy1MBB
1175 // Update machine-CFG edges
1176 BB->addSuccessor(copy1MBB);
1179 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1182 BuildMI(*BB, BB->begin(), dl, TII.get(MSP430::PHI),
1183 MI->getOperand(0).getReg())
1184 .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
1185 .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
1187 MI->eraseFromParent(); // The pseudo instruction is gone now.