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::SHL_PARTS, MVT::i32, Expand);
76 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
77 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
78 setOperationAction(ISD::SDIV, MVT::i32, Expand);
79 setOperationAction(ISD::UDIV, MVT::i32, Expand);
80 setOperationAction(ISD::SREM, MVT::i32, Expand);
81 setOperationAction(ISD::UREM, MVT::i32, Expand);
83 setOperationAction(ISD::VASTART, MVT::Other, Custom);
84 setOperationAction(ISD::VAEND, MVT::Other, Expand);
86 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
87 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
89 setSchedulingPreference(SchedulingForRegPressure);
90 computeRegisterProperties();
96 // Start the numbering where the builting ops and target ops leave off.
97 FIRST_NUMBER = ISD::BUILTIN_OP_END+ARM::INSTRUCTION_LIST_END,
98 /// CALL - A direct function call.
101 /// Return with a flag operand.
131 /// DAGFPCCToARMCC - Convert a DAG fp condition code to an ARM CC
132 // Unordered = !N & !Z & C & V = V
133 // Ordered = N | Z | !C | !V = N | Z | !V
134 static ARMCC::CondCodes DAGFPCCToARMCC(ISD::CondCode CC) {
137 assert(0 && "Unknown fp condition code!");
138 // SETOEQ = (N | Z | !V) & Z = Z = EQ
140 case ISD::SETOEQ: return ARMCC::EQ;
141 // SETOGT = (N | Z | !V) & !N & !Z = !V &!N &!Z = (N = V) & !Z = GT
143 case ISD::SETOGT: return ARMCC::GT;
144 // SETOGE = (N | Z | !V) & !N = (Z | !V) & !N = !V & !N = GE
146 case ISD::SETOGE: return ARMCC::GE;
147 // SETOLT = (N | Z | !V) & N = N = MI
149 case ISD::SETOLT: return ARMCC::MI;
150 // SETOLE = (N | Z | !V) & (N | Z) = N | Z = !C | Z = LS
152 case ISD::SETOLE: return ARMCC::LS;
153 // SETONE = (N | Z | !V) & !Z = (N | !V) & Z = !V & Z = Z = NE
155 case ISD::SETONE: return ARMCC::NE;
156 // SETO = N | Z | !V = Z | !V = !V = VC
157 case ISD::SETO: return ARMCC::VC;
159 case ISD::SETUO: return ARMCC::VS;
160 // SETUEQ = V | Z = ??
161 // SETUGT = V | (!Z & !N) = !Z & !N = !Z & C = HI
162 case ISD::SETUGT: return ARMCC::HI;
163 // SETUGE = V | !N = !N = PL
164 case ISD::SETUGE: return ARMCC::PL;
165 // SETULT = V | N = ??
166 // SETULE = V | Z | N = ??
167 // SETUNE = V | !Z = !Z = NE
168 case ISD::SETUNE: return ARMCC::NE;
172 /// DAGIntCCToARMCC - Convert a DAG integer condition code to an ARM CC
173 static ARMCC::CondCodes DAGIntCCToARMCC(ISD::CondCode CC) {
176 assert(0 && "Unknown integer condition code!");
177 case ISD::SETEQ: return ARMCC::EQ;
178 case ISD::SETNE: return ARMCC::NE;
179 case ISD::SETLT: return ARMCC::LT;
180 case ISD::SETLE: return ARMCC::LE;
181 case ISD::SETGT: return ARMCC::GT;
182 case ISD::SETGE: return ARMCC::GE;
183 case ISD::SETULT: return ARMCC::CC;
184 case ISD::SETULE: return ARMCC::LS;
185 case ISD::SETUGT: return ARMCC::HI;
186 case ISD::SETUGE: return ARMCC::CS;
190 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
193 case ARMISD::CALL: return "ARMISD::CALL";
194 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
195 case ARMISD::SELECT: return "ARMISD::SELECT";
196 case ARMISD::CMP: return "ARMISD::CMP";
197 case ARMISD::BR: return "ARMISD::BR";
198 case ARMISD::FSITOS: return "ARMISD::FSITOS";
199 case ARMISD::FTOSIS: return "ARMISD::FTOSIS";
200 case ARMISD::FSITOD: return "ARMISD::FSITOD";
201 case ARMISD::FTOSID: return "ARMISD::FTOSID";
202 case ARMISD::FUITOS: return "ARMISD::FUITOS";
203 case ARMISD::FTOUIS: return "ARMISD::FTOUIS";
204 case ARMISD::FUITOD: return "ARMISD::FUITOD";
205 case ARMISD::FTOUID: return "ARMISD::FTOUID";
206 case ARMISD::FMRRD: return "ARMISD::FMRRD";
207 case ARMISD::FMDRR: return "ARMISD::FMDRR";
208 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
212 class ArgumentLayout {
213 std::vector<bool> is_reg;
214 std::vector<unsigned> pos;
215 std::vector<MVT::ValueType> types;
217 ArgumentLayout(const std::vector<MVT::ValueType> &Types) {
221 unsigned StackOffset = 0;
222 for(std::vector<MVT::ValueType>::const_iterator I = Types.begin();
225 MVT::ValueType VT = *I;
226 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
227 unsigned size = MVT::getSizeInBits(VT)/32;
229 RegNum = ((RegNum + size - 1) / size) * size;
231 pos.push_back(RegNum);
232 is_reg.push_back(true);
235 unsigned bytes = size * 32/8;
236 StackOffset = ((StackOffset + bytes - 1) / bytes) * bytes;
237 pos.push_back(StackOffset);
238 is_reg.push_back(false);
239 StackOffset += bytes;
243 unsigned getRegisterNum(unsigned argNum) {
244 assert(isRegister(argNum));
247 unsigned getOffset(unsigned argNum) {
248 assert(isOffset(argNum));
251 unsigned isRegister(unsigned argNum) {
252 assert(argNum < is_reg.size());
253 return is_reg[argNum];
255 unsigned isOffset(unsigned argNum) {
256 return !isRegister(argNum);
258 MVT::ValueType getType(unsigned argNum) {
259 assert(argNum < types.size());
260 return types[argNum];
262 unsigned getStackSize(void) {
263 int last = is_reg.size() - 1;
266 if (isRegister(last))
268 return getOffset(last) + MVT::getSizeInBits(getType(last))/8;
270 int lastRegArg(void) {
271 int size = is_reg.size();
273 while(last < size && isRegister(last))
278 int lastRegNum(void) {
279 int l = lastRegArg();
282 unsigned r = getRegisterNum(l);
283 MVT::ValueType t = getType(l);
284 assert(t == MVT::i32 || t == MVT::f32 || t == MVT::f64);
291 // This transforms a ISD::CALL node into a
292 // callseq_star <- ARMISD:CALL <- callseq_end
294 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
295 SDOperand Chain = Op.getOperand(0);
296 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
297 assert((CallConv == CallingConv::C ||
298 CallConv == CallingConv::Fast)
299 && "unknown calling convention");
300 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
301 bool isTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getValue() != 0;
302 SDOperand Callee = Op.getOperand(4);
303 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
304 SDOperand StackPtr = DAG.getRegister(ARM::R13, MVT::i32);
305 static const unsigned regs[] = {
306 ARM::R0, ARM::R1, ARM::R2, ARM::R3
309 std::vector<MVT::ValueType> Types;
310 for (unsigned i = 0; i < NumOps; ++i) {
311 MVT::ValueType VT = Op.getOperand(5+2*i).getValueType();
314 ArgumentLayout Layout(Types);
316 unsigned NumBytes = Layout.getStackSize();
318 Chain = DAG.getCALLSEQ_START(Chain,
319 DAG.getConstant(NumBytes, MVT::i32));
321 //Build a sequence of stores
322 std::vector<SDOperand> MemOpChains;
323 for (unsigned i = Layout.lastRegArg() + 1; i < NumOps; ++i) {
324 SDOperand Arg = Op.getOperand(5+2*i);
325 unsigned ArgOffset = Layout.getOffset(i);
326 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
327 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
328 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
330 if (!MemOpChains.empty())
331 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
332 &MemOpChains[0], MemOpChains.size());
334 // If the callee is a GlobalAddress node (quite common, every direct call is)
335 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
336 // Likewise ExternalSymbol -> TargetExternalSymbol.
337 assert(Callee.getValueType() == MVT::i32);
338 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
339 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
340 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
341 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
343 // If this is a direct call, pass the chain and the callee.
345 std::vector<SDOperand> Ops;
346 Ops.push_back(Chain);
347 Ops.push_back(Callee);
349 // Build a sequence of copy-to-reg nodes chained together with token chain
350 // and flag operands which copy the outgoing args into the appropriate regs.
352 for (int i = 0, e = Layout.lastRegArg(); i <= e; ++i) {
353 SDOperand Arg = Op.getOperand(5+2*i);
354 unsigned RegNum = Layout.getRegisterNum(i);
355 unsigned Reg1 = regs[RegNum];
356 MVT::ValueType VT = Layout.getType(i);
357 assert(VT == Arg.getValueType());
358 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
360 // Add argument register to the end of the list so that it is known live
362 Ops.push_back(DAG.getRegister(Reg1, MVT::i32));
363 if (VT == MVT::f64) {
364 unsigned Reg2 = regs[RegNum + 1];
365 SDOperand SDReg1 = DAG.getRegister(Reg1, MVT::i32);
366 SDOperand SDReg2 = DAG.getRegister(Reg2, MVT::i32);
368 Ops.push_back(DAG.getRegister(Reg2, MVT::i32));
369 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
370 SDOperand Ops[] = {Chain, SDReg1, SDReg2, Arg, InFlag};
371 Chain = DAG.getNode(ARMISD::FMRRD, VTs, Ops, InFlag.Val ? 5 : 4);
374 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg);
375 Chain = DAG.getCopyToReg(Chain, Reg1, Arg, InFlag);
377 InFlag = Chain.getValue(1);
380 std::vector<MVT::ValueType> NodeTys;
381 NodeTys.push_back(MVT::Other); // Returns a chain
382 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
384 unsigned CallOpc = ARMISD::CALL;
386 Ops.push_back(InFlag);
387 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
388 InFlag = Chain.getValue(1);
390 std::vector<SDOperand> ResultVals;
393 // If the call has results, copy the values out of the ret val registers.
394 MVT::ValueType VT = Op.Val->getValueType(0);
395 if (VT != MVT::Other) {
396 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
398 SDOperand Value1 = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
399 Chain = Value1.getValue(1);
400 InFlag = Value1.getValue(2);
401 NodeTys.push_back(VT);
402 if (VT == MVT::i32) {
403 ResultVals.push_back(Value1);
404 if (Op.Val->getValueType(1) == MVT::i32) {
405 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
406 Chain = Value2.getValue(1);
407 ResultVals.push_back(Value2);
408 NodeTys.push_back(VT);
411 if (VT == MVT::f32) {
412 SDOperand Value = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Value1);
413 ResultVals.push_back(Value);
415 if (VT == MVT::f64) {
416 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
417 Chain = Value2.getValue(1);
418 SDOperand Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
419 ResultVals.push_back(Value);
423 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
424 DAG.getConstant(NumBytes, MVT::i32));
425 NodeTys.push_back(MVT::Other);
427 if (ResultVals.empty())
430 ResultVals.push_back(Chain);
431 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys, &ResultVals[0],
433 return Res.getValue(Op.ResNo);
436 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
438 SDOperand Chain = Op.getOperand(0);
439 SDOperand R0 = DAG.getRegister(ARM::R0, MVT::i32);
440 SDOperand R1 = DAG.getRegister(ARM::R1, MVT::i32);
442 switch(Op.getNumOperands()) {
444 assert(0 && "Do not know how to return this many arguments!");
447 SDOperand LR = DAG.getRegister(ARM::R14, MVT::i32);
448 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
451 SDOperand Val = Op.getOperand(1);
452 assert(Val.getValueType() == MVT::i32 ||
453 Val.getValueType() == MVT::f32 ||
454 Val.getValueType() == MVT::f64);
456 if (Val.getValueType() == MVT::f64) {
457 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
458 SDOperand Ops[] = {Chain, R0, R1, Val};
459 Copy = DAG.getNode(ARMISD::FMRRD, VTs, Ops, 4);
461 if (Val.getValueType() == MVT::f32)
462 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
463 Copy = DAG.getCopyToReg(Chain, R0, Val, SDOperand());
466 if (DAG.getMachineFunction().liveout_empty()) {
467 DAG.getMachineFunction().addLiveOut(ARM::R0);
468 if (Val.getValueType() == MVT::f64)
469 DAG.getMachineFunction().addLiveOut(ARM::R1);
474 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
475 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
476 // If we haven't noted the R0+R1 are live out, do so now.
477 if (DAG.getMachineFunction().liveout_empty()) {
478 DAG.getMachineFunction().addLiveOut(ARM::R0);
479 DAG.getMachineFunction().addLiveOut(ARM::R1);
484 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
485 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
488 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
489 MVT::ValueType PtrVT = Op.getValueType();
490 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
491 Constant *C = CP->getConstVal();
492 SDOperand CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
497 static SDOperand LowerGlobalAddress(SDOperand Op,
499 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
501 SDOperand CPAddr = DAG.getConstantPool(GV, MVT::i32, alignment);
502 return DAG.getLoad(MVT::i32, DAG.getEntryNode(), CPAddr, NULL, 0);
505 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
506 unsigned VarArgsFrameIndex) {
507 // vastart just stores the address of the VarArgsFrameIndex slot into the
508 // memory location argument.
509 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
510 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
511 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
512 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV->getValue(),
516 static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
517 int &VarArgsFrameIndex) {
518 MachineFunction &MF = DAG.getMachineFunction();
519 MachineFrameInfo *MFI = MF.getFrameInfo();
520 SSARegMap *RegMap = MF.getSSARegMap();
521 unsigned NumArgs = Op.Val->getNumValues()-1;
522 SDOperand Root = Op.getOperand(0);
523 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
524 static const unsigned REGS[] = {
525 ARM::R0, ARM::R1, ARM::R2, ARM::R3
528 std::vector<MVT::ValueType> Types(Op.Val->value_begin(), Op.Val->value_end() - 1);
529 ArgumentLayout Layout(Types);
531 std::vector<SDOperand> ArgValues;
532 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo) {
533 MVT::ValueType VT = Types[ArgNo];
536 if (Layout.isRegister(ArgNo)) {
537 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
538 unsigned RegNum = Layout.getRegisterNum(ArgNo);
539 unsigned Reg1 = REGS[RegNum];
540 unsigned VReg1 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
541 SDOperand Value1 = DAG.getCopyFromReg(Root, VReg1, MVT::i32);
542 MF.addLiveIn(Reg1, VReg1);
543 if (VT == MVT::f64) {
544 unsigned Reg2 = REGS[RegNum + 1];
545 unsigned VReg2 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
546 SDOperand Value2 = DAG.getCopyFromReg(Root, VReg2, MVT::i32);
547 MF.addLiveIn(Reg2, VReg2);
548 Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
552 Value = DAG.getNode(ISD::BIT_CONVERT, VT, Value);
555 // If the argument is actually used, emit a load from the right stack
557 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
558 unsigned Offset = Layout.getOffset(ArgNo);
559 unsigned Size = MVT::getSizeInBits(VT)/8;
560 int FI = MFI->CreateFixedObject(Size, Offset);
561 SDOperand FIN = DAG.getFrameIndex(FI, VT);
562 Value = DAG.getLoad(VT, Root, FIN, NULL, 0);
564 Value = DAG.getNode(ISD::UNDEF, VT);
567 ArgValues.push_back(Value);
570 unsigned NextRegNum = Layout.lastRegNum() + 1;
573 //If this function is vararg we must store the remaing
574 //registers so that they can be acessed with va_start
575 VarArgsFrameIndex = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
576 -16 + NextRegNum * 4);
578 SmallVector<SDOperand, 4> MemOps;
579 for (unsigned RegNo = NextRegNum; RegNo < 4; ++RegNo) {
580 int RegOffset = - (4 - RegNo) * 4;
581 int FI = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
583 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
585 unsigned VReg = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
586 MF.addLiveIn(REGS[RegNo], VReg);
588 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
589 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
590 MemOps.push_back(Store);
592 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
595 ArgValues.push_back(Root);
597 // Return the new list of results.
598 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
599 Op.Val->value_end());
600 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
603 static SDOperand GetCMP(ISD::CondCode CC, SDOperand LHS, SDOperand RHS,
605 MVT::ValueType vt = LHS.getValueType();
606 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
608 SDOperand Cmp = DAG.getNode(ARMISD::CMP, MVT::Flag, LHS, RHS);
611 Cmp = DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
615 static SDOperand GetARMCC(ISD::CondCode CC, MVT::ValueType vt,
617 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
619 return DAG.getConstant(DAGIntCCToARMCC(CC), MVT::i32);
621 return DAG.getConstant(DAGFPCCToARMCC(CC), MVT::i32);
624 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
625 SDOperand LHS = Op.getOperand(0);
626 SDOperand RHS = Op.getOperand(1);
627 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
628 SDOperand TrueVal = Op.getOperand(2);
629 SDOperand FalseVal = Op.getOperand(3);
630 SDOperand Cmp = GetCMP(CC, LHS, RHS, DAG);
631 SDOperand ARMCC = GetARMCC(CC, LHS.getValueType(), DAG);
632 return DAG.getNode(ARMISD::SELECT, MVT::i32, TrueVal, FalseVal, ARMCC, Cmp);
635 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG) {
636 SDOperand Chain = Op.getOperand(0);
637 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
638 SDOperand LHS = Op.getOperand(2);
639 SDOperand RHS = Op.getOperand(3);
640 SDOperand Dest = Op.getOperand(4);
641 SDOperand Cmp = GetCMP(CC, LHS, RHS, DAG);
642 SDOperand ARMCC = GetARMCC(CC, LHS.getValueType(), DAG);
643 return DAG.getNode(ARMISD::BR, MVT::Other, Chain, Dest, ARMCC, Cmp);
646 static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
647 SDOperand IntVal = Op.getOperand(0);
648 assert(IntVal.getValueType() == MVT::i32);
649 MVT::ValueType vt = Op.getValueType();
650 assert(vt == MVT::f32 ||
653 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
654 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FSITOS : ARMISD::FSITOD;
655 return DAG.getNode(op, vt, Tmp);
658 static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
659 assert(Op.getValueType() == MVT::i32);
660 SDOperand FloatVal = Op.getOperand(0);
661 MVT::ValueType vt = FloatVal.getValueType();
662 assert(vt == MVT::f32 || vt == MVT::f64);
664 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOSIS : ARMISD::FTOSID;
665 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
666 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
669 static SDOperand LowerUINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
670 SDOperand IntVal = Op.getOperand(0);
671 assert(IntVal.getValueType() == MVT::i32);
672 MVT::ValueType vt = Op.getValueType();
673 assert(vt == MVT::f32 ||
676 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
677 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FUITOS : ARMISD::FUITOD;
678 return DAG.getNode(op, vt, Tmp);
681 static SDOperand LowerFP_TO_UINT(SDOperand Op, SelectionDAG &DAG) {
682 assert(Op.getValueType() == MVT::i32);
683 SDOperand FloatVal = Op.getOperand(0);
684 MVT::ValueType vt = FloatVal.getValueType();
685 assert(vt == MVT::f32 || vt == MVT::f64);
687 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOUIS : ARMISD::FTOUID;
688 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
689 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
692 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
693 switch (Op.getOpcode()) {
695 assert(0 && "Should not custom lower this!");
697 case ISD::ConstantPool:
698 return LowerConstantPool(Op, DAG);
699 case ISD::GlobalAddress:
700 return LowerGlobalAddress(Op, DAG);
701 case ISD::FP_TO_SINT:
702 return LowerFP_TO_SINT(Op, DAG);
703 case ISD::SINT_TO_FP:
704 return LowerSINT_TO_FP(Op, DAG);
705 case ISD::FP_TO_UINT:
706 return LowerFP_TO_UINT(Op, DAG);
707 case ISD::UINT_TO_FP:
708 return LowerUINT_TO_FP(Op, DAG);
709 case ISD::FORMAL_ARGUMENTS:
710 return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex);
712 return LowerCALL(Op, DAG);
714 return LowerRET(Op, DAG);
716 return LowerSELECT_CC(Op, DAG);
718 return LowerBR_CC(Op, DAG);
720 return LowerVASTART(Op, DAG, VarArgsFrameIndex);
724 //===----------------------------------------------------------------------===//
725 // Instruction Selector Implementation
726 //===----------------------------------------------------------------------===//
728 //===--------------------------------------------------------------------===//
729 /// ARMDAGToDAGISel - ARM specific code to select ARM machine
730 /// instructions for SelectionDAG operations.
733 class ARMDAGToDAGISel : public SelectionDAGISel {
734 ARMTargetLowering Lowering;
737 ARMDAGToDAGISel(TargetMachine &TM)
738 : SelectionDAGISel(Lowering), Lowering(TM) {
741 SDNode *Select(SDOperand Op);
742 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
743 bool SelectAddrRegImm(SDOperand N, SDOperand &Offset, SDOperand &Base);
744 bool SelectAddrMode1(SDOperand N, SDOperand &Arg, SDOperand &Shift,
745 SDOperand &ShiftType);
746 bool SelectAddrMode5(SDOperand N, SDOperand &Arg, SDOperand &Offset);
748 // Include the pieces autogenerated from the target description.
749 #include "ARMGenDAGISel.inc"
752 void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
755 DAG.setRoot(SelectRoot(DAG.getRoot()));
756 DAG.RemoveDeadNodes();
758 ScheduleAndEmitDAG(DAG);
761 static bool isInt12Immediate(SDNode *N, short &Imm) {
762 if (N->getOpcode() != ISD::Constant)
765 int32_t t = cast<ConstantSDNode>(N)->getValue();
768 if (t > min && t < max) {
776 static bool isInt12Immediate(SDOperand Op, short &Imm) {
777 return isInt12Immediate(Op.Val, Imm);
780 static uint32_t rotateL(uint32_t x) {
781 uint32_t bit31 = (x & (1 << 31)) >> 31;
786 static bool isUInt8Immediate(uint32_t x) {
790 static bool isRotInt8Immediate(uint32_t x) {
792 for (r = 0; r < 16; r++) {
793 if (isUInt8Immediate(x))
795 x = rotateL(rotateL(x));
800 bool ARMDAGToDAGISel::SelectAddrMode1(SDOperand N,
803 SDOperand &ShiftType) {
804 switch(N.getOpcode()) {
805 case ISD::Constant: {
806 uint32_t val = cast<ConstantSDNode>(N)->getValue();
807 if(!isRotInt8Immediate(val)) {
808 const Type *t = MVT::getTypeForValueType(MVT::i32);
809 Constant *C = ConstantUInt::get(t, val);
811 SDOperand Addr = CurDAG->getTargetConstantPool(C, MVT::i32, alignment);
812 SDOperand Z = CurDAG->getTargetConstant(0, MVT::i32);
813 SDNode *n = CurDAG->getTargetNode(ARM::ldr, MVT::i32, Z, Addr);
814 Arg = SDOperand(n, 0);
816 Arg = CurDAG->getTargetConstant(val, MVT::i32);
818 Shift = CurDAG->getTargetConstant(0, MVT::i32);
819 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
823 Arg = N.getOperand(0);
824 Shift = N.getOperand(1);
825 ShiftType = CurDAG->getTargetConstant(ARMShift::ASR, MVT::i32);
828 Arg = N.getOperand(0);
829 Shift = N.getOperand(1);
830 ShiftType = CurDAG->getTargetConstant(ARMShift::LSR, MVT::i32);
833 Arg = N.getOperand(0);
834 Shift = N.getOperand(1);
835 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
840 Shift = CurDAG->getTargetConstant(0, MVT::i32);
841 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
845 bool ARMDAGToDAGISel::SelectAddrMode5(SDOperand N, SDOperand &Arg,
847 //TODO: detect offset
848 Offset = CurDAG->getTargetConstant(0, MVT::i32);
853 //register plus/minus 12 bit offset
854 bool ARMDAGToDAGISel::SelectAddrRegImm(SDOperand N, SDOperand &Offset,
856 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(N)) {
857 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
858 Offset = CurDAG->getTargetConstant(0, MVT::i32);
861 if (N.getOpcode() == ISD::ADD) {
863 if (isInt12Immediate(N.getOperand(1), imm)) {
864 Offset = CurDAG->getTargetConstant(imm, MVT::i32);
865 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
866 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
868 Base = N.getOperand(0);
870 return true; // [r+i]
874 Offset = CurDAG->getTargetConstant(0, MVT::i32);
875 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N)) {
876 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
880 return true; //any address fits in a register
883 SDNode *ARMDAGToDAGISel::Select(SDOperand Op) {
886 switch (N->getOpcode()) {
888 return SelectCode(Op);
894 } // end anonymous namespace
896 /// createARMISelDag - This pass converts a legalized DAG into a
897 /// ARM-specific DAG, ready for instruction scheduling.
899 FunctionPass *llvm::createARMISelDag(TargetMachine &TM) {
900 return new ARMDAGToDAGISel(TM);