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/ADT/VectorExtras.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineInstrBuilder.h"
25 #include "llvm/CodeGen/SelectionDAG.h"
26 #include "llvm/CodeGen/SelectionDAGISel.h"
27 #include "llvm/CodeGen/SSARegMap.h"
28 #include "llvm/Target/TargetLowering.h"
29 #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;
41 getRegClassForInlineAsmConstraint(const std::string &Constraint,
42 MVT::ValueType VT) const;
47 ARMTargetLowering::ARMTargetLowering(TargetMachine &TM)
48 : TargetLowering(TM) {
49 addRegisterClass(MVT::i32, ARM::IntRegsRegisterClass);
50 addRegisterClass(MVT::f32, ARM::FPRegsRegisterClass);
51 addRegisterClass(MVT::f64, ARM::DFPRegsRegisterClass);
53 setLoadXAction(ISD::EXTLOAD, MVT::f32, Expand);
55 setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
56 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
58 setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
59 setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
61 setOperationAction(ISD::RET, MVT::Other, Custom);
62 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
63 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
65 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
66 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
67 setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
69 setOperationAction(ISD::SELECT, MVT::i32, Expand);
71 setOperationAction(ISD::SETCC, MVT::i32, Expand);
72 setOperationAction(ISD::SETCC, MVT::f32, Expand);
73 setOperationAction(ISD::SETCC, MVT::f64, Expand);
75 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
76 setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
77 setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
79 setOperationAction(ISD::MEMMOVE, MVT::Other, Expand);
80 setOperationAction(ISD::MEMSET, MVT::Other, Expand);
81 setOperationAction(ISD::MEMCPY, MVT::Other, Expand);
83 setOperationAction(ISD::BR_JT, MVT::Other, Expand);
84 setOperationAction(ISD::BRIND, MVT::Other, Expand);
85 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
86 setOperationAction(ISD::BR_CC, MVT::f32, Custom);
87 setOperationAction(ISD::BR_CC, MVT::f64, Custom);
89 setOperationAction(ISD::BRCOND, MVT::Other, Expand);
91 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
92 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
93 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
94 setOperationAction(ISD::SDIV, MVT::i32, Expand);
95 setOperationAction(ISD::UDIV, MVT::i32, Expand);
96 setOperationAction(ISD::SREM, MVT::i32, Expand);
97 setOperationAction(ISD::UREM, MVT::i32, Expand);
99 setOperationAction(ISD::VASTART, MVT::Other, Custom);
100 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
101 setOperationAction(ISD::VAEND, MVT::Other, Expand);
102 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
104 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
105 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
107 setStackPointerRegisterToSaveRestore(ARM::R13);
109 setSchedulingPreference(SchedulingForRegPressure);
110 computeRegisterProperties();
116 // Start the numbering where the builting ops and target ops leave off.
117 FIRST_NUMBER = ISD::BUILTIN_OP_END+ARM::INSTRUCTION_LIST_END,
118 /// CALL - A direct function call.
121 /// Return with a flag operand.
151 /// DAGFPCCToARMCC - Convert a DAG fp condition code to an ARM CC
152 // Unordered = !N & !Z & C & V = V
153 // Ordered = N | Z | !C | !V = N | Z | !V
154 static ARMCC::CondCodes DAGFPCCToARMCC(ISD::CondCode CC) {
157 assert(0 && "Unknown fp condition code!");
158 // SETOEQ = (N | Z | !V) & Z = Z = EQ
160 case ISD::SETOEQ: return ARMCC::EQ;
161 // SETOGT = (N | Z | !V) & !N & !Z = !V &!N &!Z = (N = V) & !Z = GT
163 case ISD::SETOGT: return ARMCC::GT;
164 // SETOGE = (N | Z | !V) & !N = (Z | !V) & !N = !V & !N = GE
166 case ISD::SETOGE: return ARMCC::GE;
167 // SETOLT = (N | Z | !V) & N = N = MI
169 case ISD::SETOLT: return ARMCC::MI;
170 // SETOLE = (N | Z | !V) & (N | Z) = N | Z = !C | Z = LS
172 case ISD::SETOLE: return ARMCC::LS;
173 // SETONE = (N | Z | !V) & !Z = (N | !V) & !Z = !V & !Z = !Z = NE
175 case ISD::SETONE: return ARMCC::NE;
176 // SETO = N | Z | !V = Z | !V = !V = VC
177 case ISD::SETO: return ARMCC::VC;
179 case ISD::SETUO: return ARMCC::VS;
180 // SETUEQ = V | Z = ??
181 // SETUGT = V | (!Z & !N) = !Z & !N = !Z & C = HI
182 case ISD::SETUGT: return ARMCC::HI;
183 // SETUGE = V | !N = !N = PL
184 case ISD::SETUGE: return ARMCC::PL;
185 // SETULT = V | N = ??
186 // SETULE = V | Z | N = ??
187 // SETUNE = V | !Z = !Z = NE
188 case ISD::SETUNE: return ARMCC::NE;
192 /// DAGIntCCToARMCC - Convert a DAG integer condition code to an ARM CC
193 static ARMCC::CondCodes DAGIntCCToARMCC(ISD::CondCode CC) {
196 assert(0 && "Unknown integer condition code!");
197 case ISD::SETEQ: return ARMCC::EQ;
198 case ISD::SETNE: return ARMCC::NE;
199 case ISD::SETLT: return ARMCC::LT;
200 case ISD::SETLE: return ARMCC::LE;
201 case ISD::SETGT: return ARMCC::GT;
202 case ISD::SETGE: return ARMCC::GE;
203 case ISD::SETULT: return ARMCC::CC;
204 case ISD::SETULE: return ARMCC::LS;
205 case ISD::SETUGT: return ARMCC::HI;
206 case ISD::SETUGE: return ARMCC::CS;
210 std::vector<unsigned> ARMTargetLowering::
211 getRegClassForInlineAsmConstraint(const std::string &Constraint,
212 MVT::ValueType VT) const {
213 if (Constraint.size() == 1) {
214 // FIXME: handling only r regs
215 switch (Constraint[0]) {
216 default: break; // Unknown constraint letter
218 case 'r': // GENERAL_REGS
219 case 'R': // LEGACY_REGS
221 return make_vector<unsigned>(ARM::R0, ARM::R1, ARM::R2, ARM::R3,
222 ARM::R4, ARM::R5, ARM::R6, ARM::R7,
223 ARM::R8, ARM::R9, ARM::R10, ARM::R11,
224 ARM::R12, ARM::R13, ARM::R14, 0);
230 return std::vector<unsigned>();
233 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
236 case ARMISD::CALL: return "ARMISD::CALL";
237 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
238 case ARMISD::SELECT: return "ARMISD::SELECT";
239 case ARMISD::CMP: return "ARMISD::CMP";
240 case ARMISD::BR: return "ARMISD::BR";
241 case ARMISD::FSITOS: return "ARMISD::FSITOS";
242 case ARMISD::FTOSIS: return "ARMISD::FTOSIS";
243 case ARMISD::FSITOD: return "ARMISD::FSITOD";
244 case ARMISD::FTOSID: return "ARMISD::FTOSID";
245 case ARMISD::FUITOS: return "ARMISD::FUITOS";
246 case ARMISD::FTOUIS: return "ARMISD::FTOUIS";
247 case ARMISD::FUITOD: return "ARMISD::FUITOD";
248 case ARMISD::FTOUID: return "ARMISD::FTOUID";
249 case ARMISD::FMRRD: return "ARMISD::FMRRD";
250 case ARMISD::FMDRR: return "ARMISD::FMDRR";
251 case ARMISD::FMSTAT: return "ARMISD::FMSTAT";
255 class ArgumentLayout {
256 std::vector<bool> is_reg;
257 std::vector<unsigned> pos;
258 std::vector<MVT::ValueType> types;
260 ArgumentLayout(const std::vector<MVT::ValueType> &Types) {
264 unsigned StackOffset = 0;
265 for(std::vector<MVT::ValueType>::const_iterator I = Types.begin();
268 MVT::ValueType VT = *I;
269 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
270 unsigned size = MVT::getSizeInBits(VT)/32;
272 RegNum = ((RegNum + size - 1) / size) * size;
274 pos.push_back(RegNum);
275 is_reg.push_back(true);
278 unsigned bytes = size * 32/8;
279 StackOffset = ((StackOffset + bytes - 1) / bytes) * bytes;
280 pos.push_back(StackOffset);
281 is_reg.push_back(false);
282 StackOffset += bytes;
286 unsigned getRegisterNum(unsigned argNum) {
287 assert(isRegister(argNum));
290 unsigned getOffset(unsigned argNum) {
291 assert(isOffset(argNum));
294 unsigned isRegister(unsigned argNum) {
295 assert(argNum < is_reg.size());
296 return is_reg[argNum];
298 unsigned isOffset(unsigned argNum) {
299 return !isRegister(argNum);
301 MVT::ValueType getType(unsigned argNum) {
302 assert(argNum < types.size());
303 return types[argNum];
305 unsigned getStackSize(void) {
306 int last = is_reg.size() - 1;
309 if (isRegister(last))
311 return getOffset(last) + MVT::getSizeInBits(getType(last))/8;
313 int lastRegArg(void) {
314 int size = is_reg.size();
316 while(last < size && isRegister(last))
321 int lastRegNum(void) {
322 int l = lastRegArg();
325 unsigned r = getRegisterNum(l);
326 MVT::ValueType t = getType(l);
327 assert(t == MVT::i32 || t == MVT::f32 || t == MVT::f64);
334 // This transforms a ISD::CALL node into a
335 // callseq_star <- ARMISD:CALL <- callseq_end
337 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
338 SDOperand Chain = Op.getOperand(0);
339 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
340 assert((CallConv == CallingConv::C ||
341 CallConv == CallingConv::Fast)
342 && "unknown calling convention");
343 SDOperand Callee = Op.getOperand(4);
344 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
345 SDOperand StackPtr = DAG.getRegister(ARM::R13, MVT::i32);
346 static const unsigned regs[] = {
347 ARM::R0, ARM::R1, ARM::R2, ARM::R3
350 std::vector<MVT::ValueType> Types;
351 for (unsigned i = 0; i < NumOps; ++i) {
352 MVT::ValueType VT = Op.getOperand(5+2*i).getValueType();
355 ArgumentLayout Layout(Types);
357 unsigned NumBytes = Layout.getStackSize();
359 Chain = DAG.getCALLSEQ_START(Chain,
360 DAG.getConstant(NumBytes, MVT::i32));
362 //Build a sequence of stores
363 std::vector<SDOperand> MemOpChains;
364 for (unsigned i = Layout.lastRegArg() + 1; i < NumOps; ++i) {
365 SDOperand Arg = Op.getOperand(5+2*i);
366 unsigned ArgOffset = Layout.getOffset(i);
367 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
368 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
369 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff, NULL, 0));
371 if (!MemOpChains.empty())
372 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
373 &MemOpChains[0], MemOpChains.size());
375 // If the callee is a GlobalAddress node (quite common, every direct call is)
376 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
377 // Likewise ExternalSymbol -> TargetExternalSymbol.
378 assert(Callee.getValueType() == MVT::i32);
379 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
380 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
381 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
382 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
384 // If this is a direct call, pass the chain and the callee.
386 std::vector<SDOperand> Ops;
387 Ops.push_back(Chain);
388 Ops.push_back(Callee);
390 // Build a sequence of copy-to-reg nodes chained together with token chain
391 // and flag operands which copy the outgoing args into the appropriate regs.
393 for (int i = 0, e = Layout.lastRegArg(); i <= e; ++i) {
394 SDOperand Arg = Op.getOperand(5+2*i);
395 unsigned RegNum = Layout.getRegisterNum(i);
396 unsigned Reg1 = regs[RegNum];
397 MVT::ValueType VT = Layout.getType(i);
398 assert(VT == Arg.getValueType());
399 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
401 // Add argument register to the end of the list so that it is known live
403 Ops.push_back(DAG.getRegister(Reg1, MVT::i32));
404 if (VT == MVT::f64) {
405 unsigned Reg2 = regs[RegNum + 1];
406 SDOperand SDReg1 = DAG.getRegister(Reg1, MVT::i32);
407 SDOperand SDReg2 = DAG.getRegister(Reg2, MVT::i32);
409 Ops.push_back(DAG.getRegister(Reg2, MVT::i32));
410 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
411 SDOperand Ops[] = {Chain, SDReg1, SDReg2, Arg, InFlag};
412 Chain = DAG.getNode(ARMISD::FMRRD, VTs, Ops, InFlag.Val ? 5 : 4);
415 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg);
416 Chain = DAG.getCopyToReg(Chain, Reg1, Arg, InFlag);
418 InFlag = Chain.getValue(1);
421 std::vector<MVT::ValueType> NodeTys;
422 NodeTys.push_back(MVT::Other); // Returns a chain
423 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
425 unsigned CallOpc = ARMISD::CALL;
427 Ops.push_back(InFlag);
428 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
429 InFlag = Chain.getValue(1);
431 std::vector<SDOperand> ResultVals;
434 // If the call has results, copy the values out of the ret val registers.
435 MVT::ValueType VT = Op.Val->getValueType(0);
436 if (VT != MVT::Other) {
437 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
439 SDOperand Value1 = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag);
440 Chain = Value1.getValue(1);
441 InFlag = Value1.getValue(2);
442 NodeTys.push_back(VT);
443 if (VT == MVT::i32) {
444 ResultVals.push_back(Value1);
445 if (Op.Val->getValueType(1) == MVT::i32) {
446 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
447 Chain = Value2.getValue(1);
448 ResultVals.push_back(Value2);
449 NodeTys.push_back(VT);
452 if (VT == MVT::f32) {
453 SDOperand Value = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, Value1);
454 ResultVals.push_back(Value);
456 if (VT == MVT::f64) {
457 SDOperand Value2 = DAG.getCopyFromReg(Chain, ARM::R1, MVT::i32, InFlag);
458 Chain = Value2.getValue(1);
459 SDOperand Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
460 ResultVals.push_back(Value);
464 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
465 DAG.getConstant(NumBytes, MVT::i32));
466 NodeTys.push_back(MVT::Other);
468 if (ResultVals.empty())
471 ResultVals.push_back(Chain);
472 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys, &ResultVals[0],
474 return Res.getValue(Op.ResNo);
477 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
479 SDOperand Chain = Op.getOperand(0);
480 SDOperand R0 = DAG.getRegister(ARM::R0, MVT::i32);
481 SDOperand R1 = DAG.getRegister(ARM::R1, MVT::i32);
483 switch(Op.getNumOperands()) {
485 assert(0 && "Do not know how to return this many arguments!");
488 SDOperand LR = DAG.getRegister(ARM::R14, MVT::i32);
489 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
492 SDOperand Val = Op.getOperand(1);
493 assert(Val.getValueType() == MVT::i32 ||
494 Val.getValueType() == MVT::f32 ||
495 Val.getValueType() == MVT::f64);
497 if (Val.getValueType() == MVT::f64) {
498 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
499 SDOperand Ops[] = {Chain, R0, R1, Val};
500 Copy = DAG.getNode(ARMISD::FMRRD, VTs, Ops, 4);
502 if (Val.getValueType() == MVT::f32)
503 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
504 Copy = DAG.getCopyToReg(Chain, R0, Val, SDOperand());
507 if (DAG.getMachineFunction().liveout_empty()) {
508 DAG.getMachineFunction().addLiveOut(ARM::R0);
509 if (Val.getValueType() == MVT::f64)
510 DAG.getMachineFunction().addLiveOut(ARM::R1);
515 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
516 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
517 // If we haven't noted the R0+R1 are live out, do so now.
518 if (DAG.getMachineFunction().liveout_empty()) {
519 DAG.getMachineFunction().addLiveOut(ARM::R0);
520 DAG.getMachineFunction().addLiveOut(ARM::R1);
525 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
526 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
529 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
530 MVT::ValueType PtrVT = Op.getValueType();
531 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
532 Constant *C = CP->getConstVal();
533 SDOperand CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
538 static SDOperand LowerGlobalAddress(SDOperand Op,
540 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
542 SDOperand CPAddr = DAG.getConstantPool(GV, MVT::i32, alignment);
543 return DAG.getLoad(MVT::i32, DAG.getEntryNode(), CPAddr, NULL, 0);
546 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
547 unsigned VarArgsFrameIndex) {
548 // vastart just stores the address of the VarArgsFrameIndex slot into the
549 // memory location argument.
550 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
551 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
552 SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
553 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), SV->getValue(),
557 static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
558 int &VarArgsFrameIndex) {
559 MachineFunction &MF = DAG.getMachineFunction();
560 MachineFrameInfo *MFI = MF.getFrameInfo();
561 SSARegMap *RegMap = MF.getSSARegMap();
562 unsigned NumArgs = Op.Val->getNumValues()-1;
563 SDOperand Root = Op.getOperand(0);
564 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
565 static const unsigned REGS[] = {
566 ARM::R0, ARM::R1, ARM::R2, ARM::R3
569 std::vector<MVT::ValueType> Types(Op.Val->value_begin(), Op.Val->value_end() - 1);
570 ArgumentLayout Layout(Types);
572 std::vector<SDOperand> ArgValues;
573 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo) {
574 MVT::ValueType VT = Types[ArgNo];
577 if (Layout.isRegister(ArgNo)) {
578 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
579 unsigned RegNum = Layout.getRegisterNum(ArgNo);
580 unsigned Reg1 = REGS[RegNum];
581 unsigned VReg1 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
582 SDOperand Value1 = DAG.getCopyFromReg(Root, VReg1, MVT::i32);
583 MF.addLiveIn(Reg1, VReg1);
584 if (VT == MVT::f64) {
585 unsigned Reg2 = REGS[RegNum + 1];
586 unsigned VReg2 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
587 SDOperand Value2 = DAG.getCopyFromReg(Root, VReg2, MVT::i32);
588 MF.addLiveIn(Reg2, VReg2);
589 Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
593 Value = DAG.getNode(ISD::BIT_CONVERT, VT, Value);
596 // If the argument is actually used, emit a load from the right stack
598 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
599 unsigned Offset = Layout.getOffset(ArgNo);
600 unsigned Size = MVT::getSizeInBits(VT)/8;
601 int FI = MFI->CreateFixedObject(Size, Offset);
602 SDOperand FIN = DAG.getFrameIndex(FI, VT);
603 Value = DAG.getLoad(VT, Root, FIN, NULL, 0);
605 Value = DAG.getNode(ISD::UNDEF, VT);
608 ArgValues.push_back(Value);
611 unsigned NextRegNum = Layout.lastRegNum() + 1;
614 //If this function is vararg we must store the remaing
615 //registers so that they can be acessed with va_start
616 VarArgsFrameIndex = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
617 -16 + NextRegNum * 4);
619 SmallVector<SDOperand, 4> MemOps;
620 for (unsigned RegNo = NextRegNum; RegNo < 4; ++RegNo) {
621 int RegOffset = - (4 - RegNo) * 4;
622 int FI = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
624 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
626 unsigned VReg = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
627 MF.addLiveIn(REGS[RegNo], VReg);
629 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
630 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN, NULL, 0);
631 MemOps.push_back(Store);
633 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
636 ArgValues.push_back(Root);
638 // Return the new list of results.
639 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
640 Op.Val->value_end());
641 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
644 static SDOperand GetCMP(ISD::CondCode CC, SDOperand LHS, SDOperand RHS,
646 MVT::ValueType vt = LHS.getValueType();
647 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
649 SDOperand Cmp = DAG.getNode(ARMISD::CMP, MVT::Flag, LHS, RHS);
652 Cmp = DAG.getNode(ARMISD::FMSTAT, MVT::Flag, Cmp);
656 static SDOperand GetARMCC(ISD::CondCode CC, MVT::ValueType vt,
658 assert(vt == MVT::i32 || vt == MVT::f32 || vt == MVT::f64);
660 return DAG.getConstant(DAGIntCCToARMCC(CC), MVT::i32);
662 return DAG.getConstant(DAGFPCCToARMCC(CC), MVT::i32);
665 static bool isUInt8Immediate(uint32_t x) {
669 static uint32_t rotateL(uint32_t x) {
670 uint32_t bit31 = (x & (1 << 31)) >> 31;
675 static bool isRotInt8Immediate(uint32_t x) {
677 for (r = 0; r < 16; r++) {
678 if (isUInt8Immediate(x))
680 x = rotateL(rotateL(x));
685 static void LowerCMP(SDOperand &Cmp, SDOperand &ARMCC, SDOperand LHS,
686 SDOperand RHS, ISD::CondCode CC, SelectionDAG &DAG) {
687 MVT::ValueType vt = LHS.getValueType();
688 if (vt == MVT::i32) {
689 assert(!isa<ConstantSDNode>(LHS));
690 if (ConstantSDNode *SD_C = dyn_cast<ConstantSDNode>(RHS.Val)) {
691 uint32_t C = SD_C->getValue();
714 NCC = ISD::SETLE; break;
716 NCC = ISD::SETULE; break;
718 NCC = ISD::SETGT; break;
720 NCC = ISD::SETUGT; break;
722 NCC = ISD::SETLT; break;
724 NCC = ISD::SETULT; break;
726 NCC = ISD::SETGE; break;
728 NCC = ISD::SETUGE; break;
731 if (!isRotInt8Immediate(C) && isRotInt8Immediate(NC)) {
732 RHS = DAG.getConstant(NC, MVT::i32);
737 Cmp = GetCMP(CC, LHS, RHS, DAG);
738 ARMCC = GetARMCC(CC, vt, DAG);
741 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
742 SDOperand LHS = Op.getOperand(0);
743 SDOperand RHS = Op.getOperand(1);
744 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
745 SDOperand TrueVal = Op.getOperand(2);
746 SDOperand FalseVal = Op.getOperand(3);
749 LowerCMP(Cmp, ARMCC, LHS, RHS, CC, DAG);
750 return DAG.getNode(ARMISD::SELECT, Op.getValueType(), TrueVal, FalseVal, ARMCC, Cmp);
753 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG) {
754 SDOperand Chain = Op.getOperand(0);
755 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
756 SDOperand LHS = Op.getOperand(2);
757 SDOperand RHS = Op.getOperand(3);
758 SDOperand Dest = Op.getOperand(4);
761 LowerCMP(Cmp, ARMCC, LHS, RHS, CC, DAG);
762 return DAG.getNode(ARMISD::BR, MVT::Other, Chain, Dest, ARMCC, Cmp);
765 static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
766 SDOperand IntVal = Op.getOperand(0);
767 assert(IntVal.getValueType() == MVT::i32);
768 MVT::ValueType vt = Op.getValueType();
769 assert(vt == MVT::f32 ||
772 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
773 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FSITOS : ARMISD::FSITOD;
774 return DAG.getNode(op, vt, Tmp);
777 static SDOperand LowerFP_TO_SINT(SDOperand Op, SelectionDAG &DAG) {
778 assert(Op.getValueType() == MVT::i32);
779 SDOperand FloatVal = Op.getOperand(0);
780 MVT::ValueType vt = FloatVal.getValueType();
781 assert(vt == MVT::f32 || vt == MVT::f64);
783 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOSIS : ARMISD::FTOSID;
784 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
785 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
788 static SDOperand LowerUINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
789 SDOperand IntVal = Op.getOperand(0);
790 assert(IntVal.getValueType() == MVT::i32);
791 MVT::ValueType vt = Op.getValueType();
792 assert(vt == MVT::f32 ||
795 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
796 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FUITOS : ARMISD::FUITOD;
797 return DAG.getNode(op, vt, Tmp);
800 static SDOperand LowerFP_TO_UINT(SDOperand Op, SelectionDAG &DAG) {
801 assert(Op.getValueType() == MVT::i32);
802 SDOperand FloatVal = Op.getOperand(0);
803 MVT::ValueType vt = FloatVal.getValueType();
804 assert(vt == MVT::f32 || vt == MVT::f64);
806 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FTOUIS : ARMISD::FTOUID;
807 SDOperand Tmp = DAG.getNode(op, MVT::f32, FloatVal);
808 return DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Tmp);
811 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
812 switch (Op.getOpcode()) {
814 assert(0 && "Should not custom lower this!");
816 case ISD::ConstantPool:
817 return LowerConstantPool(Op, DAG);
818 case ISD::GlobalAddress:
819 return LowerGlobalAddress(Op, DAG);
820 case ISD::FP_TO_SINT:
821 return LowerFP_TO_SINT(Op, DAG);
822 case ISD::SINT_TO_FP:
823 return LowerSINT_TO_FP(Op, DAG);
824 case ISD::FP_TO_UINT:
825 return LowerFP_TO_UINT(Op, DAG);
826 case ISD::UINT_TO_FP:
827 return LowerUINT_TO_FP(Op, DAG);
828 case ISD::FORMAL_ARGUMENTS:
829 return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex);
831 return LowerCALL(Op, DAG);
833 return LowerRET(Op, DAG);
835 return LowerSELECT_CC(Op, DAG);
837 return LowerBR_CC(Op, DAG);
839 return LowerVASTART(Op, DAG, VarArgsFrameIndex);
843 //===----------------------------------------------------------------------===//
844 // Instruction Selector Implementation
845 //===----------------------------------------------------------------------===//
847 //===--------------------------------------------------------------------===//
848 /// ARMDAGToDAGISel - ARM specific code to select ARM machine
849 /// instructions for SelectionDAG operations.
852 class ARMDAGToDAGISel : public SelectionDAGISel {
853 ARMTargetLowering Lowering;
856 ARMDAGToDAGISel(TargetMachine &TM)
857 : SelectionDAGISel(Lowering), Lowering(TM) {
860 SDNode *Select(SDOperand Op);
861 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
862 bool SelectAddrMode1(SDOperand Op, SDOperand N, SDOperand &Arg,
863 SDOperand &Shift, SDOperand &ShiftType);
864 bool SelectAddrMode1a(SDOperand Op, SDOperand N, SDOperand &Arg,
865 SDOperand &Shift, SDOperand &ShiftType);
866 bool SelectAddrMode2(SDOperand Op, SDOperand N, SDOperand &Arg,
868 bool SelectAddrMode5(SDOperand Op, SDOperand N, SDOperand &Arg,
871 // Include the pieces autogenerated from the target description.
872 #include "ARMGenDAGISel.inc"
875 void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
878 DAG.setRoot(SelectRoot(DAG.getRoot()));
879 DAG.RemoveDeadNodes();
881 ScheduleAndEmitDAG(DAG);
884 static bool isInt12Immediate(SDNode *N, short &Imm) {
885 if (N->getOpcode() != ISD::Constant)
888 int32_t t = cast<ConstantSDNode>(N)->getValue();
891 if (t > min && t < max) {
899 static bool isInt12Immediate(SDOperand Op, short &Imm) {
900 return isInt12Immediate(Op.Val, Imm);
903 bool ARMDAGToDAGISel::SelectAddrMode1(SDOperand Op,
907 SDOperand &ShiftType) {
908 switch(N.getOpcode()) {
909 case ISD::Constant: {
910 uint32_t val = cast<ConstantSDNode>(N)->getValue();
911 if(!isRotInt8Immediate(val)) {
912 SDOperand Z = CurDAG->getTargetConstant(0, MVT::i32);
914 if (isRotInt8Immediate(~val)) {
915 SDOperand C = CurDAG->getTargetConstant(~val, MVT::i32);
916 n = CurDAG->getTargetNode(ARM::MVN, MVT::i32, C, Z, Z);
918 Constant *C = ConstantInt::get(Type::UIntTy, val);
920 SDOperand Addr = CurDAG->getTargetConstantPool(C, MVT::i32, alignment);
921 n = CurDAG->getTargetNode(ARM::LDR, MVT::i32, Addr, Z);
923 Arg = SDOperand(n, 0);
925 Arg = CurDAG->getTargetConstant(val, MVT::i32);
927 Shift = CurDAG->getTargetConstant(0, MVT::i32);
928 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
932 Arg = N.getOperand(0);
933 Shift = N.getOperand(1);
934 ShiftType = CurDAG->getTargetConstant(ARMShift::ASR, MVT::i32);
937 Arg = N.getOperand(0);
938 Shift = N.getOperand(1);
939 ShiftType = CurDAG->getTargetConstant(ARMShift::LSR, MVT::i32);
942 Arg = N.getOperand(0);
943 Shift = N.getOperand(1);
944 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
949 Shift = CurDAG->getTargetConstant(0, MVT::i32);
950 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
954 bool ARMDAGToDAGISel::SelectAddrMode2(SDOperand Op, SDOperand N,
955 SDOperand &Arg, SDOperand &Offset) {
956 //TODO: complete and cleanup!
957 SDOperand Zero = CurDAG->getTargetConstant(0, MVT::i32);
958 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(N)) {
959 Arg = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
963 if (N.getOpcode() == ISD::ADD) {
965 if (isInt12Immediate(N.getOperand(1), imm)) {
966 Offset = CurDAG->getTargetConstant(imm, MVT::i32);
967 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
968 Arg = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
970 Arg = N.getOperand(0);
972 return true; // [r+i]
976 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N))
977 Arg = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
983 bool ARMDAGToDAGISel::SelectAddrMode5(SDOperand Op,
984 SDOperand N, SDOperand &Arg,
986 //TODO: detect offset
987 Offset = CurDAG->getTargetConstant(0, MVT::i32);
992 SDNode *ARMDAGToDAGISel::Select(SDOperand Op) {
995 switch (N->getOpcode()) {
997 return SelectCode(Op);
999 case ISD::FrameIndex: {
1000 int FI = cast<FrameIndexSDNode>(N)->getIndex();
1001 SDOperand Ops[] = {CurDAG->getTargetFrameIndex(FI, MVT::i32),
1002 CurDAG->getTargetConstant(0, MVT::i32),
1003 CurDAG->getTargetConstant(0, MVT::i32),
1004 CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32)};
1006 return CurDAG->SelectNodeTo(N, ARM::ADD, MVT::i32, Ops,
1007 sizeof(Ops)/sizeof(SDOperand));
1013 } // end anonymous namespace
1015 /// createARMISelDag - This pass converts a legalized DAG into a
1016 /// ARM-specific DAG, ready for instruction scheduling.
1018 FunctionPass *llvm::createARMISelDag(TargetMachine &TM) {
1019 return new ARMDAGToDAGISel(TM);