1 //===-- ARMISelDAGToDAG.cpp - A dag to dag inst selector for ARM ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines an instruction selector for the ARM target.
12 //===----------------------------------------------------------------------===//
15 #include "ARMTargetMachine.h"
16 #include "llvm/CallingConv.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Function.h"
19 #include "llvm/Constants.h"
20 #include "llvm/Intrinsics.h"
21 #include "llvm/CodeGen/MachineFrameInfo.h"
22 #include "llvm/CodeGen/MachineFunction.h"
23 #include "llvm/CodeGen/MachineInstrBuilder.h"
24 #include "llvm/CodeGen/SelectionDAG.h"
25 #include "llvm/CodeGen/SelectionDAGISel.h"
26 #include "llvm/CodeGen/SSARegMap.h"
27 #include "llvm/Target/TargetLowering.h"
28 #include "llvm/Support/Debug.h"
34 class ARMTargetLowering : public TargetLowering {
35 int VarArgsFrameIndex; // FrameIndex for start of varargs area.
37 ARMTargetLowering(TargetMachine &TM);
38 virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
39 virtual const char *getTargetNodeName(unsigned Opcode) const;
44 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
45 : TargetLowering(TM) {
46 addRegisterClass(MVT::i32, ARM::IntRegsRegisterClass);
47 addRegisterClass(MVT::f32, ARM::FPRegsRegisterClass);
48 addRegisterClass(MVT::f64, ARM::DFPRegsRegisterClass);
50 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
52 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
53 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
55 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
56 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
58 setOperationAction(ISD::RET, MVT::Other, Custom);
59 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
60 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
62 setOperationAction(ISD::SELECT, MVT::i32, Expand);
64 setOperationAction(ISD::SETCC, MVT::i32, Expand);
65 setOperationAction(ISD::SETCC, MVT::f32, Expand);
66 setOperationAction(ISD::SETCC, MVT::f64, Expand);
68 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
69 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
70 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
71 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
73 setOperationAction(ISD::VASTART, MVT::Other, Custom);
74 setOperationAction(ISD::VAEND, MVT::Other, Expand);
76 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
77 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
79 setSchedulingPreference(SchedulingForRegPressure);
80 computeRegisterProperties();
86 // Start the numbering where the builting ops and target ops leave off.
87 FIRST_NUMBER = ISD::BUILTIN_OP_END+ARM::INSTRUCTION_LIST_END,
88 /// CALL - A direct function call.
91 /// Return with a flag operand.
121 /// DAGFPCCToARMCC - Convert a DAG fp condition code to an ARM CC
122 // Unordered = !N & !Z & C & V = V
123 // Ordered = N | Z | !C | !V = N | Z | !V
124 static ARMCC::CondCodes DAGFPCCToARMCC(ISD::CondCode CC) {
127 assert(0 && "Unknown fp condition code!");
128 // SETOEQ = (N | Z | !V) & Z = Z = EQ
130 case ISD::SETOEQ: return ARMCC::EQ;
131 // SETOGT = (N | Z | !V) & !N & !Z = !V &!N &!Z = (N = V) & !Z = GT
133 case ISD::SETOGT: return ARMCC::GT;
134 // SETOGE = (N | Z | !V) & !N = (Z | !V) & !N = !V & !N = GE
136 case ISD::SETOGE: return ARMCC::GE;
137 // SETOLT = (N | Z | !V) & N = N = MI
139 case ISD::SETOLT: return ARMCC::MI;
140 // SETOLE = (N | Z | !V) & (N | Z) = N | Z = !C | Z = LS
142 case ISD::SETOLE: return ARMCC::LS;
143 // SETONE = (N | Z | !V) & !Z = (N | !V) & Z = !V & Z = Z = NE
145 case ISD::SETONE: return ARMCC::NE;
146 // SETO = N | Z | !V = Z | !V = !V = VC
147 case ISD::SETO: return ARMCC::VC;
149 case ISD::SETUO: return ARMCC::VS;
150 // SETUEQ = V | Z = ??
151 // SETUGT = V | (!Z & !N) = !Z & !N = !Z & C = HI
152 case ISD::SETUGT: return ARMCC::HI;
153 // SETUGE = V | !N = !N = PL
154 case ISD::SETUGE: return ARMCC::PL;
155 // SETULT = V | N = ??
156 // SETULE = V | Z | N = ??
157 // SETUNE = V | !Z = !Z = NE
158 case ISD::SETUNE: return ARMCC::NE;
162 /// DAGIntCCToARMCC - Convert a DAG integer condition code to an ARM CC
163 static ARMCC::CondCodes DAGIntCCToARMCC(ISD::CondCode CC) {
166 assert(0 && "Unknown integer condition code!");
167 case ISD::SETEQ: return ARMCC::EQ;
168 case ISD::SETNE: return ARMCC::NE;
169 case ISD::SETLT: return ARMCC::LT;
170 case ISD::SETLE: return ARMCC::LE;
171 case ISD::SETGT: return ARMCC::GT;
172 case ISD::SETGE: return ARMCC::GE;
173 case ISD::SETULT: return ARMCC::CC;
174 case ISD::SETULE: return ARMCC::LS;
175 case ISD::SETUGT: return ARMCC::HI;
176 case ISD::SETUGE: return ARMCC::CS;
180 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
183 case ARMISD::CALL: return "ARMISD::CALL";
184 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
185 case ARMISD::SELECT: return "ARMISD::SELECT";
186 case ARMISD::CMP: return "ARMISD::CMP";
187 case ARMISD::BR: return "ARMISD::BR";
188 case ARMISD::FSITOS: return "ARMISD::FSITOS";
189 case ARMISD::FTOSIS: return "ARMISD::FTOSIS";
190 case ARMISD::FSITOD: return "ARMISD::FSITOD";
191 case ARMISD::FTOSID: return "ARMISD::FTOSID";
192 case ARMISD::FUITOS: return "ARMISD::FUITOS";
193 case ARMISD::FTOUIS: return "ARMISD::FTOUIS";
194 case ARMISD::FUITOD: return "ARMISD::FUITOD";
195 case ARMISD::FTOUID: return "ARMISD::FTOUID";
196 case ARMISD::FMRRD: return "ARMISD::FMRRD";
197 case ARMISD::FMDRR: return "ARMISD::FMDRR";
198 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
202 class ArgumentLayout {
203 std::vector<bool> is_reg;
204 std::vector<unsigned> pos;
205 std::vector<MVT::ValueType> types;
207 ArgumentLayout(const std::vector<MVT::ValueType> &Types) {
211 unsigned StackOffset = 0;
212 for(std::vector<MVT::ValueType>::const_iterator I = Types.begin();
215 MVT::ValueType VT = *I;
216 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
217 unsigned size = MVT::getSizeInBits(VT)/32;
219 RegNum = ((RegNum + size - 1) / size) * size;
221 pos.push_back(RegNum);
222 is_reg.push_back(true);
225 unsigned bytes = size * 32/8;
226 StackOffset = ((StackOffset + bytes - 1) / bytes) * bytes;
227 pos.push_back(StackOffset);
228 is_reg.push_back(false);
229 StackOffset += bytes;
233 unsigned getRegisterNum(unsigned argNum) {
234 assert(isRegister(argNum));
237 unsigned getOffset(unsigned argNum) {
238 assert(isOffset(argNum));
241 unsigned isRegister(unsigned argNum) {
242 assert(argNum < is_reg.size());
243 return is_reg[argNum];
245 unsigned isOffset(unsigned argNum) {
246 return !isRegister(argNum);
248 MVT::ValueType getType(unsigned argNum) {
249 assert(argNum < types.size());
250 return types[argNum];
252 unsigned getStackSize(void) {
253 int last = is_reg.size() - 1;
256 if (isRegister(last))
258 return getOffset(last) + MVT::getSizeInBits(getType(last))/8;
260 int lastRegArg(void) {
261 int size = is_reg.size();
263 while(last < size && isRegister(last))
268 int lastRegNum(void) {
269 int l = lastRegArg();
272 unsigned r = getRegisterNum(l);
273 MVT::ValueType t = getType(l);
274 assert(t == MVT::i32 || t == MVT::f32 || t == MVT::f64);
281 // This transforms a ISD::CALL node into a
282 // callseq_star <- ARMISD:CALL <- callseq_end
284 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
285 SDOperand Chain = Op.getOperand(0);
286 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
287 assert(CallConv == CallingConv::C && "unknown calling convention");
288 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
289 bool isTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getValue() != 0;
290 SDOperand Callee = Op.getOperand(4);
291 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
292 SDOperand StackPtr = DAG.getRegister(ARM::R13, MVT::i32);
293 static const unsigned regs[] = {
294 ARM::R0, ARM::R1, ARM::R2, ARM::R3
297 std::vector<MVT::ValueType> Types;
298 for (unsigned i = 0; i < NumOps; ++i) {
299 MVT::ValueType VT = Op.getOperand(5+2*i).getValueType();
302 ArgumentLayout Layout(Types);
304 unsigned NumBytes = Layout.getStackSize();
306 Chain = DAG.getCALLSEQ_START(Chain,
307 DAG.getConstant(NumBytes, MVT::i32));
309 //Build a sequence of stores
310 std::vector<SDOperand> MemOpChains;
311 for (unsigned i = Layout.lastRegArg() + 1; i < NumOps; ++i) {
312 SDOperand Arg = Op.getOperand(5+2*i);
313 unsigned ArgOffset = Layout.getOffset(i);
314 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
315 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
316 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
318 if (!MemOpChains.empty())
319 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
320 &MemOpChains[0], MemOpChains.size());
322 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
323 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
324 // node so that legalize doesn't hack it.
325 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
326 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), Callee.getValueType());
328 // If this is a direct call, pass the chain and the callee.
330 std::vector<SDOperand> Ops;
331 Ops.push_back(Chain);
332 Ops.push_back(Callee);
334 // Build a sequence of copy-to-reg nodes chained together with token chain
335 // and flag operands which copy the outgoing args into the appropriate regs.
337 for (int i = 0, e = Layout.lastRegArg(); i <= e; ++i) {
338 SDOperand Arg = Op.getOperand(5+2*i);
339 unsigned RegNum = Layout.getRegisterNum(i);
340 unsigned Reg1 = regs[RegNum];
341 MVT::ValueType VT = Layout.getType(i);
342 assert(VT == Arg.getValueType());
343 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
345 // Add argument register to the end of the list so that it is known live
347 Ops.push_back(DAG.getRegister(Reg1, MVT::i32));
348 if (VT == MVT::f64) {
349 unsigned Reg2 = regs[RegNum + 1];
350 SDOperand SDReg1 = DAG.getRegister(Reg1, MVT::i32);
351 SDOperand SDReg2 = DAG.getRegister(Reg2, MVT::i32);
353 Ops.push_back(DAG.getRegister(Reg2, MVT::i32));
354 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
355 SDOperand Ops[] = {Chain, SDReg1, SDReg2, Arg, InFlag};
356 Chain = DAG.getNode(ARMISD::FMRRD, VTs, Ops, InFlag.Val ? 5 : 4);
359 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg);
360 Chain = DAG.getCopyToReg(Chain, Reg1, Arg, InFlag);
362 InFlag = Chain.getValue(1);
365 std::vector<MVT::ValueType> NodeTys;
366 NodeTys.push_back(MVT::Other); // Returns a chain
367 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
369 unsigned CallOpc = ARMISD::CALL;
371 Ops.push_back(InFlag);
372 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
373 InFlag = Chain.getValue(1);
375 std::vector<SDOperand> ResultVals;
378 // If the call has results, copy the values out of the ret val registers.
379 MVT::ValueType VT = Op.Val->getValueType(0);
380 if (VT != MVT::Other) {
381 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
383 SDOperand Value1 = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
384 Chain = Value1.getValue(1);
385 InFlag = Value1.getValue(2);
386 NodeTys.push_back(VT);
387 if (VT == MVT::i32) {
388 ResultVals.push_back(Value1);
389 if (Op.Val->getValueType(1) == MVT::i32) {
390 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
391 Chain = Value2.getValue(1);
392 ResultVals.push_back(Value2);
393 NodeTys.push_back(VT);
396 if (VT == MVT::f32) {
397 SDOperand Value = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Value1);
398 ResultVals.push_back(Value);
400 if (VT == MVT::f64) {
401 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
402 Chain = Value2.getValue(1);
403 SDOperand Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
404 ResultVals.push_back(Value);
408 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
409 DAG.getConstant(NumBytes, MVT::i32));
410 NodeTys.push_back(MVT::Other);
412 if (ResultVals.empty())
415 ResultVals.push_back(Chain);
416 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys, &ResultVals[0],
418 return Res.getValue(Op.ResNo);
421 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
423 SDOperand Chain = Op.getOperand(0);
424 SDOperand R0 = DAG.getRegister(ARM::R0, MVT::i32);
425 SDOperand R1 = DAG.getRegister(ARM::R1, MVT::i32);
427 switch(Op.getNumOperands()) {
429 assert(0 && "Do not know how to return this many arguments!");
432 SDOperand LR = DAG.getRegister(ARM::R14, MVT::i32);
433 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
436 SDOperand Val = Op.getOperand(1);
437 assert(Val.getValueType() == MVT::i32 ||
438 Val.getValueType() == MVT::f32 ||
439 Val.getValueType() == MVT::f64);
441 if (Val.getValueType() == MVT::f64) {
442 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
443 SDOperand Ops[] = {Chain, R0, R1, Val};
444 Copy = DAG.getNode(ARMISD::FMRRD, VTs, Ops, 4);
446 if (Val.getValueType() == MVT::f32)
447 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
448 Copy = DAG.getCopyToReg(Chain, R0, Val, SDOperand());
451 if (DAG.getMachineFunction().liveout_empty()) {
452 DAG.getMachineFunction().addLiveOut(ARM::R0);
453 if (Val.getValueType() == MVT::f64)
454 DAG.getMachineFunction().addLiveOut(ARM::R1);
459 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
460 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
461 // If we haven't noted the R0+R1 are live out, do so now.
462 if (DAG.getMachineFunction().liveout_empty()) {
463 DAG.getMachineFunction().addLiveOut(ARM::R0);
464 DAG.getMachineFunction().addLiveOut(ARM::R1);
469 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
470 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
473 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
474 MVT::ValueType PtrVT = Op.getValueType();
475 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
476 Constant *C = CP->getConstVal();
477 SDOperand CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
482 static SDOperand LowerGlobalAddress(SDOperand Op,
484 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
486 SDOperand CPAddr = DAG.getConstantPool(GV, MVT::i32, alignment);
487 return DAG.getLoad(MVT::i32, DAG.getEntryNode(), CPAddr, NULL, 0);
490 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
491 unsigned VarArgsFrameIndex) {
492 // vastart just stores the address of the VarArgsFrameIndex slot into the
493 // memory location argument.
494 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
495 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
496 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
497 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV->getValue(),
501 static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
502 int &VarArgsFrameIndex) {
503 MachineFunction &MF = DAG.getMachineFunction();
504 MachineFrameInfo *MFI = MF.getFrameInfo();
505 SSARegMap *RegMap = MF.getSSARegMap();
506 unsigned NumArgs = Op.Val->getNumValues()-1;
507 SDOperand Root = Op.getOperand(0);
508 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
509 static const unsigned REGS[] = {
510 ARM::R0, ARM::R1, ARM::R2, ARM::R3
513 std::vector<MVT::ValueType> Types(Op.Val->value_begin(), Op.Val->value_end() - 1);
514 ArgumentLayout Layout(Types);
516 std::vector<SDOperand> ArgValues;
517 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo) {
518 MVT::ValueType VT = Types[ArgNo];
521 if (Layout.isRegister(ArgNo)) {
522 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
523 unsigned RegNum = Layout.getRegisterNum(ArgNo);
524 unsigned Reg1 = REGS[RegNum];
525 unsigned VReg1 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
526 SDOperand Value1 = DAG.getCopyFromReg(Root, VReg1, MVT::i32);
527 MF.addLiveIn(Reg1, VReg1);
528 if (VT == MVT::f64) {
529 unsigned Reg2 = REGS[RegNum + 1];
530 unsigned VReg2 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
531 SDOperand Value2 = DAG.getCopyFromReg(Root, VReg2, MVT::i32);
532 MF.addLiveIn(Reg2, VReg2);
533 Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
537 Value = DAG.getNode(ISD::BIT_CONVERT, VT, Value);
540 // If the argument is actually used, emit a load from the right stack
542 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
543 unsigned Offset = Layout.getOffset(ArgNo);
544 unsigned Size = MVT::getSizeInBits(VT)/8;
545 int FI = MFI->CreateFixedObject(Size, Offset);
546 SDOperand FIN = DAG.getFrameIndex(FI, VT);
547 Value = DAG.getLoad(VT, Root, FIN, NULL, 0);
549 Value = DAG.getNode(ISD::UNDEF, VT);
552 ArgValues.push_back(Value);
555 unsigned NextRegNum = Layout.lastRegNum() + 1;
558 //If this function is vararg we must store the remaing
559 //registers so that they can be acessed with va_start
560 VarArgsFrameIndex = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
561 -16 + NextRegNum * 4);
563 SmallVector<SDOperand, 4> MemOps;
564 for (unsigned RegNo = NextRegNum; RegNo < 4; ++RegNo) {
565 int RegOffset = - (4 - RegNo) * 4;
566 int FI = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
568 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
570 unsigned VReg = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
571 MF.addLiveIn(REGS[RegNo], VReg);
573 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
574 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
575 MemOps.push_back(Store);
577 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
580 ArgValues.push_back(Root);
582 // Return the new list of results.
583 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
584 Op.Val->value_end());
585 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
588 static SDOperand GetCMP(ISD::CondCode CC, SDOperand LHS, SDOperand RHS,
590 MVT::ValueType vt = LHS.getValueType();
591 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
593 SDOperand Cmp = DAG.getNode(ARMISD::CMP, MVT::Flag, LHS, RHS);
596 Cmp = DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
600 static SDOperand GetARMCC(ISD::CondCode CC, MVT::ValueType vt,
602 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
604 return DAG.getConstant(DAGIntCCToARMCC(CC), MVT::i32);
606 return DAG.getConstant(DAGFPCCToARMCC(CC), MVT::i32);
609 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
610 SDOperand LHS = Op.getOperand(0);
611 SDOperand RHS = Op.getOperand(1);
612 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
613 SDOperand TrueVal = Op.getOperand(2);
614 SDOperand FalseVal = Op.getOperand(3);
615 SDOperand Cmp = GetCMP(CC, LHS, RHS, DAG);
616 SDOperand ARMCC = GetARMCC(CC, LHS.getValueType(), DAG);
617 return DAG.getNode(ARMISD::SELECT, MVT::i32, TrueVal, FalseVal, ARMCC, Cmp);
620 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG) {
621 SDOperand Chain = Op.getOperand(0);
622 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
623 SDOperand LHS = Op.getOperand(2);
624 SDOperand RHS = Op.getOperand(3);
625 SDOperand Dest = Op.getOperand(4);
626 SDOperand Cmp = GetCMP(CC, LHS, RHS, DAG);
627 SDOperand ARMCC = GetARMCC(CC, LHS.getValueType(), DAG);
628 return DAG.getNode(ARMISD::BR, MVT::Other, Chain, Dest, ARMCC, Cmp);
631 static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
632 SDOperand IntVal = Op.getOperand(0);
633 assert(IntVal.getValueType() == MVT::i32);
634 MVT::ValueType vt = Op.getValueType();
635 assert(vt == MVT::f32 ||
638 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
639 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FSITOS : ARMISD::FSITOD;
640 return DAG.getNode(op, vt, Tmp);
643 static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
644 assert(Op.getValueType() == MVT::i32);
645 SDOperand FloatVal = Op.getOperand(0);
646 MVT::ValueType vt = FloatVal.getValueType();
647 assert(vt == MVT::f32 || vt == MVT::f64);
649 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOSIS : ARMISD::FTOSID;
650 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
651 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
654 static SDOperand LowerUINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
655 SDOperand IntVal = Op.getOperand(0);
656 assert(IntVal.getValueType() == MVT::i32);
657 MVT::ValueType vt = Op.getValueType();
658 assert(vt == MVT::f32 ||
661 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
662 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FUITOS : ARMISD::FUITOD;
663 return DAG.getNode(op, vt, Tmp);
666 static SDOperand LowerFP_TO_UINT(SDOperand Op, SelectionDAG &DAG) {
667 assert(Op.getValueType() == MVT::i32);
668 SDOperand FloatVal = Op.getOperand(0);
669 MVT::ValueType vt = FloatVal.getValueType();
670 assert(vt == MVT::f32 || vt == MVT::f64);
672 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOUIS : ARMISD::FTOUID;
673 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
674 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
677 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
678 switch (Op.getOpcode()) {
680 assert(0 && "Should not custom lower this!");
682 case ISD::ConstantPool:
683 return LowerConstantPool(Op, DAG);
684 case ISD::GlobalAddress:
685 return LowerGlobalAddress(Op, DAG);
686 case ISD::FP_TO_SINT:
687 return LowerFP_TO_SINT(Op, DAG);
688 case ISD::SINT_TO_FP:
689 return LowerSINT_TO_FP(Op, DAG);
690 case ISD::FP_TO_UINT:
691 return LowerFP_TO_UINT(Op, DAG);
692 case ISD::UINT_TO_FP:
693 return LowerUINT_TO_FP(Op, DAG);
694 case ISD::FORMAL_ARGUMENTS:
695 return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex);
697 return LowerCALL(Op, DAG);
699 return LowerRET(Op, DAG);
701 return LowerSELECT_CC(Op, DAG);
703 return LowerBR_CC(Op, DAG);
705 return LowerVASTART(Op, DAG, VarArgsFrameIndex);
709 //===----------------------------------------------------------------------===//
710 // Instruction Selector Implementation
711 //===----------------------------------------------------------------------===//
713 //===--------------------------------------------------------------------===//
714 /// ARMDAGToDAGISel - ARM specific code to select ARM machine
715 /// instructions for SelectionDAG operations.
718 class ARMDAGToDAGISel : public SelectionDAGISel {
719 ARMTargetLowering Lowering;
722 ARMDAGToDAGISel(TargetMachine &TM)
723 : SelectionDAGISel(Lowering), Lowering(TM) {
726 SDNode *Select(SDOperand Op);
727 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
728 bool SelectAddrRegImm(SDOperand N, SDOperand &Offset, SDOperand &Base);
729 bool SelectAddrMode1(SDOperand N, SDOperand &Arg, SDOperand &Shift,
730 SDOperand &ShiftType);
732 // Include the pieces autogenerated from the target description.
733 #include "ARMGenDAGISel.inc"
736 void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
739 DAG.setRoot(SelectRoot(DAG.getRoot()));
740 DAG.RemoveDeadNodes();
742 ScheduleAndEmitDAG(DAG);
745 static bool isInt12Immediate(SDNode *N, short &Imm) {
746 if (N->getOpcode() != ISD::Constant)
749 int32_t t = cast<ConstantSDNode>(N)->getValue();
752 if (t > min && t < max) {
760 static bool isInt12Immediate(SDOperand Op, short &Imm) {
761 return isInt12Immediate(Op.Val, Imm);
764 static uint32_t rotateL(uint32_t x) {
765 uint32_t bit31 = (x & (1 << 31)) >> 31;
770 static bool isUInt8Immediate(uint32_t x) {
774 static bool isRotInt8Immediate(uint32_t x) {
776 for (r = 0; r < 16; r++) {
777 if (isUInt8Immediate(x))
779 x = rotateL(rotateL(x));
784 bool ARMDAGToDAGISel::SelectAddrMode1(SDOperand N,
787 SDOperand &ShiftType) {
788 switch(N.getOpcode()) {
789 case ISD::Constant: {
790 uint32_t val = cast<ConstantSDNode>(N)->getValue();
791 if(!isRotInt8Immediate(val)) {
792 const Type *t = MVT::getTypeForValueType(MVT::i32);
793 Constant *C = ConstantUInt::get(t, val);
795 SDOperand Addr = CurDAG->getTargetConstantPool(C, MVT::i32, alignment);
796 SDOperand Z = CurDAG->getTargetConstant(0, MVT::i32);
797 SDNode *n = CurDAG->getTargetNode(ARM::ldr, MVT::i32, Z, Addr);
798 Arg = SDOperand(n, 0);
800 Arg = CurDAG->getTargetConstant(val, MVT::i32);
802 Shift = CurDAG->getTargetConstant(0, MVT::i32);
803 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
807 Arg = N.getOperand(0);
808 Shift = N.getOperand(1);
809 ShiftType = CurDAG->getTargetConstant(ARMShift::ASR, MVT::i32);
812 Arg = N.getOperand(0);
813 Shift = N.getOperand(1);
814 ShiftType = CurDAG->getTargetConstant(ARMShift::LSR, MVT::i32);
817 Arg = N.getOperand(0);
818 Shift = N.getOperand(1);
819 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
824 Shift = CurDAG->getTargetConstant(0, MVT::i32);
825 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
829 //register plus/minus 12 bit offset
830 bool ARMDAGToDAGISel::SelectAddrRegImm(SDOperand N, SDOperand &Offset,
832 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(N)) {
833 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
834 Offset = CurDAG->getTargetConstant(0, MVT::i32);
837 if (N.getOpcode() == ISD::ADD) {
839 if (isInt12Immediate(N.getOperand(1), imm)) {
840 Offset = CurDAG->getTargetConstant(imm, MVT::i32);
841 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
842 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
844 Base = N.getOperand(0);
846 return true; // [r+i]
850 Offset = CurDAG->getTargetConstant(0, MVT::i32);
851 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N)) {
852 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
856 return true; //any address fits in a register
859 SDNode *ARMDAGToDAGISel::Select(SDOperand Op) {
862 switch (N->getOpcode()) {
864 return SelectCode(Op);
870 } // end anonymous namespace
872 /// createARMISelDag - This pass converts a legalized DAG into a
873 /// ARM-specific DAG, ready for instruction scheduling.
875 FunctionPass *llvm::createARMISelDag(TargetMachine &TM) {
876 return new ARMDAGToDAGISel(TM);