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::BRCOND, MVT::Other, Expand);
75 setOperationAction(ISD::VASTART, MVT::Other, Custom);
76 setOperationAction(ISD::VAEND, MVT::Other, Expand);
78 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
79 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
81 setSchedulingPreference(SchedulingForRegPressure);
82 computeRegisterProperties();
88 // Start the numbering where the builting ops and target ops leave off.
89 FIRST_NUMBER = ISD::BUILTIN_OP_END+ARM::INSTRUCTION_LIST_END,
90 /// CALL - A direct function call.
93 /// Return with a flag operand.
123 /// DAGFPCCToARMCC - Convert a DAG fp condition code to an ARM CC
124 // Unordered = !N & !Z & C & V = V
125 // Ordered = N | Z | !C | !V = N | Z | !V
126 static ARMCC::CondCodes DAGFPCCToARMCC(ISD::CondCode CC) {
129 assert(0 && "Unknown fp condition code!");
130 // SETOEQ = (N | Z | !V) & Z = Z = EQ
132 case ISD::SETOEQ: return ARMCC::EQ;
133 // SETOGT = (N | Z | !V) & !N & !Z = !V &!N &!Z = (N = V) & !Z = GT
135 case ISD::SETOGT: return ARMCC::GT;
136 // SETOGE = (N | Z | !V) & !N = (Z | !V) & !N = !V & !N = GE
138 case ISD::SETOGE: return ARMCC::GE;
139 // SETOLT = (N | Z | !V) & N = N = MI
141 case ISD::SETOLT: return ARMCC::MI;
142 // SETOLE = (N | Z | !V) & (N | Z) = N | Z = !C | Z = LS
144 case ISD::SETOLE: return ARMCC::LS;
145 // SETONE = (N | Z | !V) & !Z = (N | !V) & Z = !V & Z = Z = NE
147 case ISD::SETONE: return ARMCC::NE;
148 // SETO = N | Z | !V = Z | !V = !V = VC
149 case ISD::SETO: return ARMCC::VC;
151 case ISD::SETUO: return ARMCC::VS;
152 // SETUEQ = V | Z = ??
153 // SETUGT = V | (!Z & !N) = !Z & !N = !Z & C = HI
154 case ISD::SETUGT: return ARMCC::HI;
155 // SETUGE = V | !N = !N = PL
156 case ISD::SETUGE: return ARMCC::PL;
157 // SETULT = V | N = ??
158 // SETULE = V | Z | N = ??
159 // SETUNE = V | !Z = !Z = NE
160 case ISD::SETUNE: return ARMCC::NE;
164 /// DAGIntCCToARMCC - Convert a DAG integer condition code to an ARM CC
165 static ARMCC::CondCodes DAGIntCCToARMCC(ISD::CondCode CC) {
168 assert(0 && "Unknown integer condition code!");
169 case ISD::SETEQ: return ARMCC::EQ;
170 case ISD::SETNE: return ARMCC::NE;
171 case ISD::SETLT: return ARMCC::LT;
172 case ISD::SETLE: return ARMCC::LE;
173 case ISD::SETGT: return ARMCC::GT;
174 case ISD::SETGE: return ARMCC::GE;
175 case ISD::SETULT: return ARMCC::CC;
176 case ISD::SETULE: return ARMCC::LS;
177 case ISD::SETUGT: return ARMCC::HI;
178 case ISD::SETUGE: return ARMCC::CS;
182 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
185 case ARMISD::CALL: return "ARMISD::CALL";
186 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
187 case ARMISD::SELECT: return "ARMISD::SELECT";
188 case ARMISD::CMP: return "ARMISD::CMP";
189 case ARMISD::BR: return "ARMISD::BR";
190 case ARMISD::FSITOS: return "ARMISD::FSITOS";
191 case ARMISD::FTOSIS: return "ARMISD::FTOSIS";
192 case ARMISD::FSITOD: return "ARMISD::FSITOD";
193 case ARMISD::FTOSID: return "ARMISD::FTOSID";
194 case ARMISD::FUITOS: return "ARMISD::FUITOS";
195 case ARMISD::FTOUIS: return "ARMISD::FTOUIS";
196 case ARMISD::FUITOD: return "ARMISD::FUITOD";
197 case ARMISD::FTOUID: return "ARMISD::FTOUID";
198 case ARMISD::FMRRD: return "ARMISD::FMRRD";
199 case ARMISD::FMDRR: return "ARMISD::FMDRR";
200 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
204 class ArgumentLayout {
205 std::vector<bool> is_reg;
206 std::vector<unsigned> pos;
207 std::vector<MVT::ValueType> types;
209 ArgumentLayout(const std::vector<MVT::ValueType> &Types) {
213 unsigned StackOffset = 0;
214 for(std::vector<MVT::ValueType>::const_iterator I = Types.begin();
217 MVT::ValueType VT = *I;
218 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
219 unsigned size = MVT::getSizeInBits(VT)/32;
221 RegNum = ((RegNum + size - 1) / size) * size;
223 pos.push_back(RegNum);
224 is_reg.push_back(true);
227 unsigned bytes = size * 32/8;
228 StackOffset = ((StackOffset + bytes - 1) / bytes) * bytes;
229 pos.push_back(StackOffset);
230 is_reg.push_back(false);
231 StackOffset += bytes;
235 unsigned getRegisterNum(unsigned argNum) {
236 assert(isRegister(argNum));
239 unsigned getOffset(unsigned argNum) {
240 assert(isOffset(argNum));
243 unsigned isRegister(unsigned argNum) {
244 assert(argNum < is_reg.size());
245 return is_reg[argNum];
247 unsigned isOffset(unsigned argNum) {
248 return !isRegister(argNum);
250 MVT::ValueType getType(unsigned argNum) {
251 assert(argNum < types.size());
252 return types[argNum];
254 unsigned getStackSize(void) {
255 int last = is_reg.size() - 1;
258 if (isRegister(last))
260 return getOffset(last) + MVT::getSizeInBits(getType(last))/8;
262 int lastRegArg(void) {
263 int size = is_reg.size();
265 while(last < size && isRegister(last))
270 int lastRegNum(void) {
271 int l = lastRegArg();
274 unsigned r = getRegisterNum(l);
275 MVT::ValueType t = getType(l);
276 assert(t == MVT::i32 || t == MVT::f32 || t == MVT::f64);
283 // This transforms a ISD::CALL node into a
284 // callseq_star <- ARMISD:CALL <- callseq_end
286 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
287 SDOperand Chain = Op.getOperand(0);
288 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
289 assert(CallConv == CallingConv::C && "unknown calling convention");
290 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
291 bool isTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getValue() != 0;
292 SDOperand Callee = Op.getOperand(4);
293 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
294 SDOperand StackPtr = DAG.getRegister(ARM::R13, MVT::i32);
295 static const unsigned regs[] = {
296 ARM::R0, ARM::R1, ARM::R2, ARM::R3
299 std::vector<MVT::ValueType> Types;
300 for (unsigned i = 0; i < NumOps; ++i) {
301 MVT::ValueType VT = Op.getOperand(5+2*i).getValueType();
304 ArgumentLayout Layout(Types);
306 unsigned NumBytes = Layout.getStackSize();
308 Chain = DAG.getCALLSEQ_START(Chain,
309 DAG.getConstant(NumBytes, MVT::i32));
311 //Build a sequence of stores
312 std::vector<SDOperand> MemOpChains;
313 for (unsigned i = Layout.lastRegArg() + 1; i < NumOps; ++i) {
314 SDOperand Arg = Op.getOperand(5+2*i);
315 unsigned ArgOffset = Layout.getOffset(i);
316 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
317 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
318 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
320 if (!MemOpChains.empty())
321 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
322 &MemOpChains[0], MemOpChains.size());
324 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
325 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
326 // node so that legalize doesn't hack it.
327 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
328 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), Callee.getValueType());
330 // If this is a direct call, pass the chain and the callee.
332 std::vector<SDOperand> Ops;
333 Ops.push_back(Chain);
334 Ops.push_back(Callee);
336 // Build a sequence of copy-to-reg nodes chained together with token chain
337 // and flag operands which copy the outgoing args into the appropriate regs.
339 for (int i = 0, e = Layout.lastRegArg(); i <= e; ++i) {
340 SDOperand Arg = Op.getOperand(5+2*i);
341 unsigned RegNum = Layout.getRegisterNum(i);
342 unsigned Reg1 = regs[RegNum];
343 MVT::ValueType VT = Layout.getType(i);
344 assert(VT == Arg.getValueType());
345 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
347 // Add argument register to the end of the list so that it is known live
349 Ops.push_back(DAG.getRegister(Reg1, MVT::i32));
350 if (VT == MVT::f64) {
351 unsigned Reg2 = regs[RegNum + 1];
352 SDOperand SDReg1 = DAG.getRegister(Reg1, MVT::i32);
353 SDOperand SDReg2 = DAG.getRegister(Reg2, MVT::i32);
355 Ops.push_back(DAG.getRegister(Reg2, MVT::i32));
356 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
357 SDOperand Ops[] = {Chain, SDReg1, SDReg2, Arg, InFlag};
358 Chain = DAG.getNode(ARMISD::FMRRD, VTs, Ops, InFlag.Val ? 5 : 4);
361 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg);
362 Chain = DAG.getCopyToReg(Chain, Reg1, Arg, InFlag);
364 InFlag = Chain.getValue(1);
367 std::vector<MVT::ValueType> NodeTys;
368 NodeTys.push_back(MVT::Other); // Returns a chain
369 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
371 unsigned CallOpc = ARMISD::CALL;
373 Ops.push_back(InFlag);
374 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
375 InFlag = Chain.getValue(1);
377 std::vector<SDOperand> ResultVals;
380 // If the call has results, copy the values out of the ret val registers.
381 MVT::ValueType VT = Op.Val->getValueType(0);
382 if (VT != MVT::Other) {
383 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
385 SDOperand Value1 = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
386 Chain = Value1.getValue(1);
387 InFlag = Value1.getValue(2);
388 NodeTys.push_back(VT);
389 if (VT == MVT::i32) {
390 ResultVals.push_back(Value1);
391 if (Op.Val->getValueType(1) == MVT::i32) {
392 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
393 Chain = Value2.getValue(1);
394 ResultVals.push_back(Value2);
395 NodeTys.push_back(VT);
398 if (VT == MVT::f32) {
399 SDOperand Value = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Value1);
400 ResultVals.push_back(Value);
402 if (VT == MVT::f64) {
403 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
404 Chain = Value2.getValue(1);
405 SDOperand Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
406 ResultVals.push_back(Value);
410 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
411 DAG.getConstant(NumBytes, MVT::i32));
412 NodeTys.push_back(MVT::Other);
414 if (ResultVals.empty())
417 ResultVals.push_back(Chain);
418 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys, &ResultVals[0],
420 return Res.getValue(Op.ResNo);
423 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
425 SDOperand Chain = Op.getOperand(0);
426 SDOperand R0 = DAG.getRegister(ARM::R0, MVT::i32);
427 SDOperand R1 = DAG.getRegister(ARM::R1, MVT::i32);
429 switch(Op.getNumOperands()) {
431 assert(0 && "Do not know how to return this many arguments!");
434 SDOperand LR = DAG.getRegister(ARM::R14, MVT::i32);
435 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
438 SDOperand Val = Op.getOperand(1);
439 assert(Val.getValueType() == MVT::i32 ||
440 Val.getValueType() == MVT::f32 ||
441 Val.getValueType() == MVT::f64);
443 if (Val.getValueType() == MVT::f64) {
444 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
445 SDOperand Ops[] = {Chain, R0, R1, Val};
446 Copy = DAG.getNode(ARMISD::FMRRD, VTs, Ops, 4);
448 if (Val.getValueType() == MVT::f32)
449 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
450 Copy = DAG.getCopyToReg(Chain, R0, Val, SDOperand());
453 if (DAG.getMachineFunction().liveout_empty()) {
454 DAG.getMachineFunction().addLiveOut(ARM::R0);
455 if (Val.getValueType() == MVT::f64)
456 DAG.getMachineFunction().addLiveOut(ARM::R1);
461 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
462 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
463 // If we haven't noted the R0+R1 are live out, do so now.
464 if (DAG.getMachineFunction().liveout_empty()) {
465 DAG.getMachineFunction().addLiveOut(ARM::R0);
466 DAG.getMachineFunction().addLiveOut(ARM::R1);
471 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
472 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
475 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
476 MVT::ValueType PtrVT = Op.getValueType();
477 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
478 Constant *C = CP->getConstVal();
479 SDOperand CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
484 static SDOperand LowerGlobalAddress(SDOperand Op,
486 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
488 SDOperand CPAddr = DAG.getConstantPool(GV, MVT::i32, alignment);
489 return DAG.getLoad(MVT::i32, DAG.getEntryNode(), CPAddr, NULL, 0);
492 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
493 unsigned VarArgsFrameIndex) {
494 // vastart just stores the address of the VarArgsFrameIndex slot into the
495 // memory location argument.
496 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
497 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
498 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
499 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV->getValue(),
503 static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
504 int &VarArgsFrameIndex) {
505 MachineFunction &MF = DAG.getMachineFunction();
506 MachineFrameInfo *MFI = MF.getFrameInfo();
507 SSARegMap *RegMap = MF.getSSARegMap();
508 unsigned NumArgs = Op.Val->getNumValues()-1;
509 SDOperand Root = Op.getOperand(0);
510 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
511 static const unsigned REGS[] = {
512 ARM::R0, ARM::R1, ARM::R2, ARM::R3
515 std::vector<MVT::ValueType> Types(Op.Val->value_begin(), Op.Val->value_end() - 1);
516 ArgumentLayout Layout(Types);
518 std::vector<SDOperand> ArgValues;
519 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo) {
520 MVT::ValueType VT = Types[ArgNo];
523 if (Layout.isRegister(ArgNo)) {
524 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
525 unsigned RegNum = Layout.getRegisterNum(ArgNo);
526 unsigned Reg1 = REGS[RegNum];
527 unsigned VReg1 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
528 SDOperand Value1 = DAG.getCopyFromReg(Root, VReg1, MVT::i32);
529 MF.addLiveIn(Reg1, VReg1);
530 if (VT == MVT::f64) {
531 unsigned Reg2 = REGS[RegNum + 1];
532 unsigned VReg2 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
533 SDOperand Value2 = DAG.getCopyFromReg(Root, VReg2, MVT::i32);
534 MF.addLiveIn(Reg2, VReg2);
535 Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
539 Value = DAG.getNode(ISD::BIT_CONVERT, VT, Value);
542 // If the argument is actually used, emit a load from the right stack
544 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
545 unsigned Offset = Layout.getOffset(ArgNo);
546 unsigned Size = MVT::getSizeInBits(VT)/8;
547 int FI = MFI->CreateFixedObject(Size, Offset);
548 SDOperand FIN = DAG.getFrameIndex(FI, VT);
549 Value = DAG.getLoad(VT, Root, FIN, NULL, 0);
551 Value = DAG.getNode(ISD::UNDEF, VT);
554 ArgValues.push_back(Value);
557 unsigned NextRegNum = Layout.lastRegNum() + 1;
560 //If this function is vararg we must store the remaing
561 //registers so that they can be acessed with va_start
562 VarArgsFrameIndex = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
563 -16 + NextRegNum * 4);
565 SmallVector<SDOperand, 4> MemOps;
566 for (unsigned RegNo = NextRegNum; RegNo < 4; ++RegNo) {
567 int RegOffset = - (4 - RegNo) * 4;
568 int FI = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
570 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
572 unsigned VReg = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
573 MF.addLiveIn(REGS[RegNo], VReg);
575 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
576 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
577 MemOps.push_back(Store);
579 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
582 ArgValues.push_back(Root);
584 // Return the new list of results.
585 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
586 Op.Val->value_end());
587 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
590 static SDOperand GetCMP(ISD::CondCode CC, SDOperand LHS, SDOperand RHS,
592 MVT::ValueType vt = LHS.getValueType();
593 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
595 SDOperand Cmp = DAG.getNode(ARMISD::CMP, MVT::Flag, LHS, RHS);
598 Cmp = DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
602 static SDOperand GetARMCC(ISD::CondCode CC, MVT::ValueType vt,
604 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
606 return DAG.getConstant(DAGIntCCToARMCC(CC), MVT::i32);
608 return DAG.getConstant(DAGFPCCToARMCC(CC), MVT::i32);
611 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
612 SDOperand LHS = Op.getOperand(0);
613 SDOperand RHS = Op.getOperand(1);
614 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
615 SDOperand TrueVal = Op.getOperand(2);
616 SDOperand FalseVal = Op.getOperand(3);
617 SDOperand Cmp = GetCMP(CC, LHS, RHS, DAG);
618 SDOperand ARMCC = GetARMCC(CC, LHS.getValueType(), DAG);
619 return DAG.getNode(ARMISD::SELECT, MVT::i32, TrueVal, FalseVal, ARMCC, Cmp);
622 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG) {
623 SDOperand Chain = Op.getOperand(0);
624 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
625 SDOperand LHS = Op.getOperand(2);
626 SDOperand RHS = Op.getOperand(3);
627 SDOperand Dest = Op.getOperand(4);
628 SDOperand Cmp = GetCMP(CC, LHS, RHS, DAG);
629 SDOperand ARMCC = GetARMCC(CC, LHS.getValueType(), DAG);
630 return DAG.getNode(ARMISD::BR, MVT::Other, Chain, Dest, ARMCC, Cmp);
633 static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
634 SDOperand IntVal = Op.getOperand(0);
635 assert(IntVal.getValueType() == MVT::i32);
636 MVT::ValueType vt = Op.getValueType();
637 assert(vt == MVT::f32 ||
640 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
641 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FSITOS : ARMISD::FSITOD;
642 return DAG.getNode(op, vt, Tmp);
645 static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
646 assert(Op.getValueType() == MVT::i32);
647 SDOperand FloatVal = Op.getOperand(0);
648 MVT::ValueType vt = FloatVal.getValueType();
649 assert(vt == MVT::f32 || vt == MVT::f64);
651 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOSIS : ARMISD::FTOSID;
652 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
653 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
656 static SDOperand LowerUINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
657 SDOperand IntVal = Op.getOperand(0);
658 assert(IntVal.getValueType() == MVT::i32);
659 MVT::ValueType vt = Op.getValueType();
660 assert(vt == MVT::f32 ||
663 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
664 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FUITOS : ARMISD::FUITOD;
665 return DAG.getNode(op, vt, Tmp);
668 static SDOperand LowerFP_TO_UINT(SDOperand Op, SelectionDAG &DAG) {
669 assert(Op.getValueType() == MVT::i32);
670 SDOperand FloatVal = Op.getOperand(0);
671 MVT::ValueType vt = FloatVal.getValueType();
672 assert(vt == MVT::f32 || vt == MVT::f64);
674 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOUIS : ARMISD::FTOUID;
675 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
676 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
679 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
680 switch (Op.getOpcode()) {
682 assert(0 && "Should not custom lower this!");
684 case ISD::ConstantPool:
685 return LowerConstantPool(Op, DAG);
686 case ISD::GlobalAddress:
687 return LowerGlobalAddress(Op, DAG);
688 case ISD::FP_TO_SINT:
689 return LowerFP_TO_SINT(Op, DAG);
690 case ISD::SINT_TO_FP:
691 return LowerSINT_TO_FP(Op, DAG);
692 case ISD::FP_TO_UINT:
693 return LowerFP_TO_UINT(Op, DAG);
694 case ISD::UINT_TO_FP:
695 return LowerUINT_TO_FP(Op, DAG);
696 case ISD::FORMAL_ARGUMENTS:
697 return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex);
699 return LowerCALL(Op, DAG);
701 return LowerRET(Op, DAG);
703 return LowerSELECT_CC(Op, DAG);
705 return LowerBR_CC(Op, DAG);
707 return LowerVASTART(Op, DAG, VarArgsFrameIndex);
711 //===----------------------------------------------------------------------===//
712 // Instruction Selector Implementation
713 //===----------------------------------------------------------------------===//
715 //===--------------------------------------------------------------------===//
716 /// ARMDAGToDAGISel - ARM specific code to select ARM machine
717 /// instructions for SelectionDAG operations.
720 class ARMDAGToDAGISel : public SelectionDAGISel {
721 ARMTargetLowering Lowering;
724 ARMDAGToDAGISel(TargetMachine &TM)
725 : SelectionDAGISel(Lowering), Lowering(TM) {
728 SDNode *Select(SDOperand Op);
729 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
730 bool SelectAddrRegImm(SDOperand N, SDOperand &Offset, SDOperand &Base);
731 bool SelectAddrMode1(SDOperand N, SDOperand &Arg, SDOperand &Shift,
732 SDOperand &ShiftType);
734 // Include the pieces autogenerated from the target description.
735 #include "ARMGenDAGISel.inc"
738 void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
741 DAG.setRoot(SelectRoot(DAG.getRoot()));
742 DAG.RemoveDeadNodes();
744 ScheduleAndEmitDAG(DAG);
747 static bool isInt12Immediate(SDNode *N, short &Imm) {
748 if (N->getOpcode() != ISD::Constant)
751 int32_t t = cast<ConstantSDNode>(N)->getValue();
754 if (t > min && t < max) {
762 static bool isInt12Immediate(SDOperand Op, short &Imm) {
763 return isInt12Immediate(Op.Val, Imm);
766 static uint32_t rotateL(uint32_t x) {
767 uint32_t bit31 = (x & (1 << 31)) >> 31;
772 static bool isUInt8Immediate(uint32_t x) {
776 static bool isRotInt8Immediate(uint32_t x) {
778 for (r = 0; r < 16; r++) {
779 if (isUInt8Immediate(x))
781 x = rotateL(rotateL(x));
786 bool ARMDAGToDAGISel::SelectAddrMode1(SDOperand N,
789 SDOperand &ShiftType) {
790 switch(N.getOpcode()) {
791 case ISD::Constant: {
792 uint32_t val = cast<ConstantSDNode>(N)->getValue();
793 if(!isRotInt8Immediate(val)) {
794 const Type *t = MVT::getTypeForValueType(MVT::i32);
795 Constant *C = ConstantUInt::get(t, val);
797 SDOperand Addr = CurDAG->getTargetConstantPool(C, MVT::i32, alignment);
798 SDOperand Z = CurDAG->getTargetConstant(0, MVT::i32);
799 SDNode *n = CurDAG->getTargetNode(ARM::ldr, MVT::i32, Z, Addr);
800 Arg = SDOperand(n, 0);
802 Arg = CurDAG->getTargetConstant(val, MVT::i32);
804 Shift = CurDAG->getTargetConstant(0, MVT::i32);
805 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
809 Arg = N.getOperand(0);
810 Shift = N.getOperand(1);
811 ShiftType = CurDAG->getTargetConstant(ARMShift::ASR, MVT::i32);
814 Arg = N.getOperand(0);
815 Shift = N.getOperand(1);
816 ShiftType = CurDAG->getTargetConstant(ARMShift::LSR, MVT::i32);
819 Arg = N.getOperand(0);
820 Shift = N.getOperand(1);
821 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
826 Shift = CurDAG->getTargetConstant(0, MVT::i32);
827 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
831 //register plus/minus 12 bit offset
832 bool ARMDAGToDAGISel::SelectAddrRegImm(SDOperand N, SDOperand &Offset,
834 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(N)) {
835 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
836 Offset = CurDAG->getTargetConstant(0, MVT::i32);
839 if (N.getOpcode() == ISD::ADD) {
841 if (isInt12Immediate(N.getOperand(1), imm)) {
842 Offset = CurDAG->getTargetConstant(imm, MVT::i32);
843 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
844 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
846 Base = N.getOperand(0);
848 return true; // [r+i]
852 Offset = CurDAG->getTargetConstant(0, MVT::i32);
853 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N)) {
854 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
858 return true; //any address fits in a register
861 SDNode *ARMDAGToDAGISel::Select(SDOperand Op) {
864 switch (N->getOpcode()) {
866 return SelectCode(Op);
872 } // end anonymous namespace
874 /// createARMISelDag - This pass converts a legalized DAG into a
875 /// ARM-specific DAG, ready for instruction scheduling.
877 FunctionPass *llvm::createARMISelDag(TargetMachine &TM) {
878 return new ARMDAGToDAGISel(TM);