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 setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
52 setOperationAction(ISD::RET, MVT::Other, Custom);
53 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
54 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
56 setOperationAction(ISD::SETCC, MVT::i32, Expand);
57 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
58 setOperationAction(ISD::BR_CC, MVT::i32, Custom);
60 setOperationAction(ISD::VASTART, MVT::Other, Custom);
61 setOperationAction(ISD::VAEND, MVT::Other, Expand);
63 setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
64 setOperationAction(ISD::ConstantFP, MVT::f32, Expand);
66 setSchedulingPreference(SchedulingForRegPressure);
67 computeRegisterProperties();
73 // Start the numbering where the builting ops and target ops leave off.
74 FIRST_NUMBER = ISD::BUILTIN_OP_END+ARM::INSTRUCTION_LIST_END,
75 /// CALL - A direct function call.
78 /// Return with a flag operand.
98 /// DAGCCToARMCC - Convert a DAG integer condition code to an ARM CC
99 static ARMCC::CondCodes DAGCCToARMCC(ISD::CondCode CC) {
102 std::cerr << "CC = " << CC << "\n";
103 assert(0 && "Unknown condition code!");
104 case ISD::SETUGT: return ARMCC::HI;
105 case ISD::SETULE: return ARMCC::LS;
106 case ISD::SETLE: return ARMCC::LE;
107 case ISD::SETLT: return ARMCC::LT;
108 case ISD::SETGT: return ARMCC::GT;
109 case ISD::SETNE: return ARMCC::NE;
110 case ISD::SETEQ: return ARMCC::EQ;
111 case ISD::SETGE: return ARMCC::GE;
112 case ISD::SETUGE: return ARMCC::CS;
113 case ISD::SETULT: return ARMCC::CC;
117 const char *ARMTargetLowering::getTargetNodeName(unsigned Opcode) const {
120 case ARMISD::CALL: return "ARMISD::CALL";
121 case ARMISD::RET_FLAG: return "ARMISD::RET_FLAG";
122 case ARMISD::SELECT: return "ARMISD::SELECT";
123 case ARMISD::CMP: return "ARMISD::CMP";
124 case ARMISD::BR: return "ARMISD::BR";
125 case ARMISD::FSITOS: return "ARMISD::FSITOS";
126 case ARMISD::FSITOD: return "ARMISD::FSITOD";
127 case ARMISD::FMRRD: return "ARMISD::FMRRD";
128 case ARMISD::FMDRR: return "ARMISD::FMDRR";
132 class ArgumentLayout {
133 std::vector<bool> is_reg;
134 std::vector<unsigned> pos;
135 std::vector<MVT::ValueType> types;
137 ArgumentLayout(const std::vector<MVT::ValueType> &Types) {
141 unsigned StackOffset = 0;
142 for(std::vector<MVT::ValueType>::const_iterator I = Types.begin();
145 MVT::ValueType VT = *I;
146 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
147 unsigned size = MVT::getSizeInBits(VT)/32;
149 RegNum = ((RegNum + size - 1) / size) * size;
151 pos.push_back(RegNum);
152 is_reg.push_back(true);
155 unsigned bytes = size * 32/8;
156 StackOffset = ((StackOffset + bytes - 1) / bytes) * bytes;
157 pos.push_back(StackOffset);
158 is_reg.push_back(false);
159 StackOffset += bytes;
163 unsigned getRegisterNum(unsigned argNum) {
164 assert(isRegister(argNum));
167 unsigned getOffset(unsigned argNum) {
168 assert(isOffset(argNum));
171 unsigned isRegister(unsigned argNum) {
172 assert(argNum < is_reg.size());
173 return is_reg[argNum];
175 unsigned isOffset(unsigned argNum) {
176 return !isRegister(argNum);
178 MVT::ValueType getType(unsigned argNum) {
179 assert(argNum < types.size());
180 return types[argNum];
182 unsigned getStackSize(void) {
183 int last = is_reg.size() - 1;
186 if (isRegister(last))
188 return getOffset(last) + MVT::getSizeInBits(getType(last))/8;
190 int lastRegArg(void) {
191 int size = is_reg.size();
193 while(last < size && isRegister(last))
198 int lastRegNum(void) {
199 int l = lastRegArg();
202 unsigned r = getRegisterNum(l);
203 MVT::ValueType t = getType(l);
204 assert(t == MVT::i32 || t == MVT::f32 || t == MVT::f64);
211 // This transforms a ISD::CALL node into a
212 // callseq_star <- ARMISD:CALL <- callseq_end
214 static SDOperand LowerCALL(SDOperand Op, SelectionDAG &DAG) {
215 SDOperand Chain = Op.getOperand(0);
216 unsigned CallConv = cast<ConstantSDNode>(Op.getOperand(1))->getValue();
217 assert(CallConv == CallingConv::C && "unknown calling convention");
218 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
219 bool isTailCall = cast<ConstantSDNode>(Op.getOperand(3))->getValue() != 0;
220 assert(isTailCall == false && "tail call not supported");
221 SDOperand Callee = Op.getOperand(4);
222 unsigned NumOps = (Op.getNumOperands() - 5) / 2;
223 SDOperand StackPtr = DAG.getRegister(ARM::R13, MVT::i32);
224 static const unsigned regs[] = {
225 ARM::R0, ARM::R1, ARM::R2, ARM::R3
228 std::vector<MVT::ValueType> Types;
229 for (unsigned i = 0; i < NumOps; ++i) {
230 MVT::ValueType VT = Op.getOperand(5+2*i).getValueType();
233 ArgumentLayout Layout(Types);
235 unsigned NumBytes = Layout.getStackSize();
237 Chain = DAG.getCALLSEQ_START(Chain,
238 DAG.getConstant(NumBytes, MVT::i32));
240 //Build a sequence of stores
241 std::vector<SDOperand> MemOpChains;
242 for (unsigned i = Layout.lastRegArg() + 1; i < NumOps; ++i) {
243 SDOperand Arg = Op.getOperand(5+2*i);
244 unsigned ArgOffset = Layout.getOffset(i);
245 SDOperand PtrOff = DAG.getConstant(ArgOffset, StackPtr.getValueType());
246 PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
247 MemOpChains.push_back(DAG.getStore(Chain, Arg, PtrOff,
248 DAG.getSrcValue(NULL)));
250 if (!MemOpChains.empty())
251 Chain = DAG.getNode(ISD::TokenFactor, MVT::Other,
252 &MemOpChains[0], MemOpChains.size());
254 // If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
255 // direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
256 // node so that legalize doesn't hack it.
257 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
258 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), Callee.getValueType());
260 // If this is a direct call, pass the chain and the callee.
262 std::vector<SDOperand> Ops;
263 Ops.push_back(Chain);
264 Ops.push_back(Callee);
266 // Build a sequence of copy-to-reg nodes chained together with token chain
267 // and flag operands which copy the outgoing args into the appropriate regs.
269 for (int i = 0, e = Layout.lastRegArg(); i <= e; ++i) {
270 SDOperand Arg = Op.getOperand(5+2*i);
271 unsigned RegNum = Layout.getRegisterNum(i);
272 unsigned Reg1 = regs[RegNum];
273 MVT::ValueType VT = Layout.getType(i);
274 assert(VT == Arg.getValueType());
275 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
277 // Add argument register to the end of the list so that it is known live
279 Ops.push_back(DAG.getRegister(Reg1, MVT::i32));
280 if (VT == MVT::f64) {
281 unsigned Reg2 = regs[RegNum + 1];
282 SDOperand SDReg1 = DAG.getRegister(Reg1, MVT::i32);
283 SDOperand SDReg2 = DAG.getRegister(Reg2, MVT::i32);
285 Ops.push_back(DAG.getRegister(Reg2, MVT::i32));
286 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
287 SDOperand Ops[] = {Chain, SDReg1, SDReg2, Arg}; //missing flag
288 Chain = DAG.getNode(ARMISD::FMRRD, VTs, Ops, 4);
291 Arg = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Arg);
292 Chain = DAG.getCopyToReg(Chain, Reg1, Arg, InFlag);
294 InFlag = Chain.getValue(1);
297 std::vector<MVT::ValueType> NodeTys;
298 NodeTys.push_back(MVT::Other); // Returns a chain
299 NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
301 unsigned CallOpc = ARMISD::CALL;
303 Ops.push_back(InFlag);
304 Chain = DAG.getNode(CallOpc, NodeTys, &Ops[0], Ops.size());
305 InFlag = Chain.getValue(1);
307 std::vector<SDOperand> ResultVals;
310 // If the call has results, copy the values out of the ret val registers.
311 switch (Op.Val->getValueType(0)) {
312 default: assert(0 && "Unexpected ret value!");
316 Chain = DAG.getCopyFromReg(Chain, ARM::R0, MVT::i32, InFlag).getValue(1);
317 ResultVals.push_back(Chain.getValue(0));
318 NodeTys.push_back(MVT::i32);
321 Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
322 DAG.getConstant(NumBytes, MVT::i32));
323 NodeTys.push_back(MVT::Other);
325 if (ResultVals.empty())
328 ResultVals.push_back(Chain);
329 SDOperand Res = DAG.getNode(ISD::MERGE_VALUES, NodeTys, &ResultVals[0],
331 return Res.getValue(Op.ResNo);
334 static SDOperand LowerRET(SDOperand Op, SelectionDAG &DAG) {
336 SDOperand Chain = Op.getOperand(0);
337 SDOperand R0 = DAG.getRegister(ARM::R0, MVT::i32);
338 SDOperand R1 = DAG.getRegister(ARM::R1, MVT::i32);
340 switch(Op.getNumOperands()) {
342 assert(0 && "Do not know how to return this many arguments!");
345 SDOperand LR = DAG.getRegister(ARM::R14, MVT::i32);
346 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Chain);
349 SDOperand Val = Op.getOperand(1);
350 assert(Val.getValueType() == MVT::i32 ||
351 Val.getValueType() == MVT::f32 ||
352 Val.getValueType() == MVT::f64);
354 if (Val.getValueType() == MVT::f64) {
355 SDVTList VTs = DAG.getVTList(MVT::Other, MVT::Flag);
356 SDOperand Ops[] = {Chain, R0, R1, Val};
357 Copy = DAG.getNode(ARMISD::FMRRD, VTs, Ops, 4);
359 if (Val.getValueType() == MVT::f32)
360 Val = DAG.getNode(ISD::BIT_CONVERT, MVT::i32, Val);
361 Copy = DAG.getCopyToReg(Chain, R0, Val, SDOperand());
364 if (DAG.getMachineFunction().liveout_empty()) {
365 DAG.getMachineFunction().addLiveOut(ARM::R0);
366 if (Val.getValueType() == MVT::f64)
367 DAG.getMachineFunction().addLiveOut(ARM::R1);
372 Copy = DAG.getCopyToReg(Chain, ARM::R1, Op.getOperand(3), SDOperand());
373 Copy = DAG.getCopyToReg(Copy, ARM::R0, Op.getOperand(1), Copy.getValue(1));
374 // If we haven't noted the R0+R1 are live out, do so now.
375 if (DAG.getMachineFunction().liveout_empty()) {
376 DAG.getMachineFunction().addLiveOut(ARM::R0);
377 DAG.getMachineFunction().addLiveOut(ARM::R1);
382 //We must use RET_FLAG instead of BRIND because BRIND doesn't have a flag
383 return DAG.getNode(ARMISD::RET_FLAG, MVT::Other, Copy, Copy.getValue(1));
386 static SDOperand LowerConstantPool(SDOperand Op, SelectionDAG &DAG) {
387 MVT::ValueType PtrVT = Op.getValueType();
388 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
389 Constant *C = CP->getConstVal();
390 SDOperand CPI = DAG.getTargetConstantPool(C, PtrVT, CP->getAlignment());
395 static SDOperand LowerGlobalAddress(SDOperand Op,
397 GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
399 SDOperand CPAddr = DAG.getConstantPool(GV, MVT::i32, alignment);
400 return DAG.getLoad(MVT::i32, DAG.getEntryNode(), CPAddr,
401 DAG.getSrcValue(NULL));
404 static SDOperand LowerVASTART(SDOperand Op, SelectionDAG &DAG,
405 unsigned VarArgsFrameIndex) {
406 // vastart just stores the address of the VarArgsFrameIndex slot into the
407 // memory location argument.
408 MVT::ValueType PtrVT = DAG.getTargetLoweringInfo().getPointerTy();
409 SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, PtrVT);
410 return DAG.getStore(Op.getOperand(0), FR, Op.getOperand(1), Op.getOperand(2));
413 static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
414 int &VarArgsFrameIndex) {
415 MachineFunction &MF = DAG.getMachineFunction();
416 MachineFrameInfo *MFI = MF.getFrameInfo();
417 SSARegMap *RegMap = MF.getSSARegMap();
418 unsigned NumArgs = Op.Val->getNumValues()-1;
419 SDOperand Root = Op.getOperand(0);
420 bool isVarArg = cast<ConstantSDNode>(Op.getOperand(2))->getValue() != 0;
421 static const unsigned REGS[] = {
422 ARM::R0, ARM::R1, ARM::R2, ARM::R3
425 std::vector<MVT::ValueType> Types(Op.Val->value_begin(), Op.Val->value_end() - 1);
426 ArgumentLayout Layout(Types);
428 std::vector<SDOperand> ArgValues;
429 for (unsigned ArgNo = 0; ArgNo < NumArgs; ++ArgNo) {
430 MVT::ValueType VT = Types[ArgNo];
433 if (Layout.isRegister(ArgNo)) {
434 assert(VT == MVT::i32 || VT == MVT::f32 || VT == MVT::f64);
435 unsigned RegNum = Layout.getRegisterNum(ArgNo);
436 unsigned Reg1 = REGS[RegNum];
437 unsigned VReg1 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
438 SDOperand Value1 = DAG.getCopyFromReg(Root, VReg1, MVT::i32);
439 MF.addLiveIn(Reg1, VReg1);
440 if (VT == MVT::f64) {
441 unsigned Reg2 = REGS[RegNum + 1];
442 unsigned VReg2 = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
443 SDOperand Value2 = DAG.getCopyFromReg(Root, VReg2, MVT::i32);
444 MF.addLiveIn(Reg2, VReg2);
445 Value = DAG.getNode(ARMISD::FMDRR, MVT::f64, Value1, Value2);
449 Value = DAG.getNode(ISD::BIT_CONVERT, VT, Value);
452 // If the argument is actually used, emit a load from the right stack
454 if (!Op.Val->hasNUsesOfValue(0, ArgNo)) {
455 unsigned Offset = Layout.getOffset(ArgNo);
456 unsigned Size = MVT::getSizeInBits(VT)/8;
457 int FI = MFI->CreateFixedObject(Size, Offset);
458 SDOperand FIN = DAG.getFrameIndex(FI, VT);
459 Value = DAG.getLoad(VT, Root, FIN, DAG.getSrcValue(NULL));
461 Value = DAG.getNode(ISD::UNDEF, VT);
464 ArgValues.push_back(Value);
467 unsigned NextRegNum = Layout.lastRegNum() + 1;
470 //If this function is vararg we must store the remaing
471 //registers so that they can be acessed with va_start
472 VarArgsFrameIndex = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
473 -16 + NextRegNum * 4);
475 SmallVector<SDOperand, 4> MemOps;
476 for (unsigned RegNo = NextRegNum; RegNo < 4; ++RegNo) {
477 int RegOffset = - (4 - RegNo) * 4;
478 int FI = MFI->CreateFixedObject(MVT::getSizeInBits(MVT::i32)/8,
480 SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
482 unsigned VReg = RegMap->createVirtualRegister(&ARM::IntRegsRegClass);
483 MF.addLiveIn(REGS[RegNo], VReg);
485 SDOperand Val = DAG.getCopyFromReg(Root, VReg, MVT::i32);
486 SDOperand Store = DAG.getStore(Val.getValue(1), Val, FIN,
487 DAG.getSrcValue(NULL));
488 MemOps.push_back(Store);
490 Root = DAG.getNode(ISD::TokenFactor, MVT::Other,&MemOps[0],MemOps.size());
493 ArgValues.push_back(Root);
495 // Return the new list of results.
496 std::vector<MVT::ValueType> RetVT(Op.Val->value_begin(),
497 Op.Val->value_end());
498 return DAG.getNode(ISD::MERGE_VALUES, RetVT, &ArgValues[0], ArgValues.size());
501 static SDOperand LowerSELECT_CC(SDOperand Op, SelectionDAG &DAG) {
502 SDOperand LHS = Op.getOperand(0);
503 SDOperand RHS = Op.getOperand(1);
504 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
505 SDOperand TrueVal = Op.getOperand(2);
506 SDOperand FalseVal = Op.getOperand(3);
507 SDOperand ARMCC = DAG.getConstant(DAGCCToARMCC(CC), MVT::i32);
509 SDOperand Cmp = DAG.getNode(ARMISD::CMP, MVT::Flag, LHS, RHS);
510 return DAG.getNode(ARMISD::SELECT, MVT::i32, TrueVal, FalseVal, ARMCC, Cmp);
513 static SDOperand LowerBR_CC(SDOperand Op, SelectionDAG &DAG) {
514 SDOperand Chain = Op.getOperand(0);
515 ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
516 SDOperand LHS = Op.getOperand(2);
517 SDOperand RHS = Op.getOperand(3);
518 SDOperand Dest = Op.getOperand(4);
519 SDOperand ARMCC = DAG.getConstant(DAGCCToARMCC(CC), MVT::i32);
521 SDOperand Cmp = DAG.getNode(ARMISD::CMP, MVT::Flag, LHS, RHS);
522 return DAG.getNode(ARMISD::BR, MVT::Other, Chain, Dest, ARMCC, Cmp);
525 static SDOperand LowerSINT_TO_FP(SDOperand Op, SelectionDAG &DAG) {
526 SDOperand IntVal = Op.getOperand(0);
527 assert(IntVal.getValueType() == MVT::i32);
528 MVT::ValueType vt = Op.getValueType();
529 assert(vt == MVT::f32 ||
532 SDOperand Tmp = DAG.getNode(ISD::BIT_CONVERT, MVT::f32, IntVal);
533 ARMISD::NodeType op = vt == MVT::f32 ? ARMISD::FSITOS : ARMISD::FSITOD;
534 return DAG.getNode(op, vt, Tmp);
537 SDOperand ARMTargetLowering::LowerOperation(SDOperand Op, SelectionDAG &DAG) {
538 switch (Op.getOpcode()) {
540 assert(0 && "Should not custom lower this!");
542 case ISD::ConstantPool:
543 return LowerConstantPool(Op, DAG);
544 case ISD::GlobalAddress:
545 return LowerGlobalAddress(Op, DAG);
546 case ISD::SINT_TO_FP:
547 return LowerSINT_TO_FP(Op, DAG);
548 case ISD::FORMAL_ARGUMENTS:
549 return LowerFORMAL_ARGUMENTS(Op, DAG, VarArgsFrameIndex);
551 return LowerCALL(Op, DAG);
553 return LowerRET(Op, DAG);
555 return LowerSELECT_CC(Op, DAG);
557 return LowerBR_CC(Op, DAG);
559 return LowerVASTART(Op, DAG, VarArgsFrameIndex);
563 //===----------------------------------------------------------------------===//
564 // Instruction Selector Implementation
565 //===----------------------------------------------------------------------===//
567 //===--------------------------------------------------------------------===//
568 /// ARMDAGToDAGISel - ARM specific code to select ARM machine
569 /// instructions for SelectionDAG operations.
572 class ARMDAGToDAGISel : public SelectionDAGISel {
573 ARMTargetLowering Lowering;
576 ARMDAGToDAGISel(TargetMachine &TM)
577 : SelectionDAGISel(Lowering), Lowering(TM) {
580 SDNode *Select(SDOperand Op);
581 virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
582 bool SelectAddrRegImm(SDOperand N, SDOperand &Offset, SDOperand &Base);
583 bool SelectAddrMode1(SDOperand N, SDOperand &Arg, SDOperand &Shift,
584 SDOperand &ShiftType);
586 // Include the pieces autogenerated from the target description.
587 #include "ARMGenDAGISel.inc"
590 void ARMDAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
593 DAG.setRoot(SelectRoot(DAG.getRoot()));
594 DAG.RemoveDeadNodes();
596 ScheduleAndEmitDAG(DAG);
599 static bool isInt12Immediate(SDNode *N, short &Imm) {
600 if (N->getOpcode() != ISD::Constant)
603 int32_t t = cast<ConstantSDNode>(N)->getValue();
606 if (t > min && t < max) {
614 static bool isInt12Immediate(SDOperand Op, short &Imm) {
615 return isInt12Immediate(Op.Val, Imm);
618 static uint32_t rotateL(uint32_t x) {
619 uint32_t bit31 = (x & (1 << 31)) >> 31;
624 static bool isUInt8Immediate(uint32_t x) {
628 static bool isRotInt8Immediate(uint32_t x) {
630 for (r = 0; r < 16; r++) {
631 if (isUInt8Immediate(x))
633 x = rotateL(rotateL(x));
638 bool ARMDAGToDAGISel::SelectAddrMode1(SDOperand N,
641 SDOperand &ShiftType) {
642 switch(N.getOpcode()) {
643 case ISD::Constant: {
644 uint32_t val = cast<ConstantSDNode>(N)->getValue();
645 if(!isRotInt8Immediate(val)) {
646 const Type *t = MVT::getTypeForValueType(MVT::i32);
647 Constant *C = ConstantUInt::get(t, val);
649 SDOperand Addr = CurDAG->getTargetConstantPool(C, MVT::i32, alignment);
650 SDOperand Z = CurDAG->getTargetConstant(0, MVT::i32);
651 SDNode *n = CurDAG->getTargetNode(ARM::ldr, MVT::i32, Z, Addr);
652 Arg = SDOperand(n, 0);
654 Arg = CurDAG->getTargetConstant(val, MVT::i32);
656 Shift = CurDAG->getTargetConstant(0, MVT::i32);
657 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
661 Arg = N.getOperand(0);
662 Shift = N.getOperand(1);
663 ShiftType = CurDAG->getTargetConstant(ARMShift::ASR, MVT::i32);
666 Arg = N.getOperand(0);
667 Shift = N.getOperand(1);
668 ShiftType = CurDAG->getTargetConstant(ARMShift::LSR, MVT::i32);
671 Arg = N.getOperand(0);
672 Shift = N.getOperand(1);
673 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
678 Shift = CurDAG->getTargetConstant(0, MVT::i32);
679 ShiftType = CurDAG->getTargetConstant(ARMShift::LSL, MVT::i32);
683 //register plus/minus 12 bit offset
684 bool ARMDAGToDAGISel::SelectAddrRegImm(SDOperand N, SDOperand &Offset,
686 if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(N)) {
687 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
688 Offset = CurDAG->getTargetConstant(0, MVT::i32);
691 if (N.getOpcode() == ISD::ADD) {
693 if (isInt12Immediate(N.getOperand(1), imm)) {
694 Offset = CurDAG->getTargetConstant(imm, MVT::i32);
695 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N.getOperand(0))) {
696 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
698 Base = N.getOperand(0);
700 return true; // [r+i]
704 Offset = CurDAG->getTargetConstant(0, MVT::i32);
705 if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(N)) {
706 Base = CurDAG->getTargetFrameIndex(FI->getIndex(), N.getValueType());
710 return true; //any address fits in a register
713 SDNode *ARMDAGToDAGISel::Select(SDOperand Op) {
716 switch (N->getOpcode()) {
718 return SelectCode(Op);
724 } // end anonymous namespace
726 /// createARMISelDag - This pass converts a legalized DAG into a
727 /// ARM-specific DAG, ready for instruction scheduling.
729 FunctionPass *llvm::createARMISelDag(TargetMachine &TM) {
730 return new ARMDAGToDAGISel(TM);