1 //===-- XCoreISelLowering.cpp - XCore DAG Lowering Implementation ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the XCoreTargetLowering class.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "xcore-lower"
16 #include "XCoreISelLowering.h"
18 #include "XCoreMachineFunctionInfo.h"
19 #include "XCoreSubtarget.h"
20 #include "XCoreTargetMachine.h"
21 #include "XCoreTargetObjectFile.h"
22 #include "llvm/CodeGen/CallingConvLower.h"
23 #include "llvm/CodeGen/MachineFrameInfo.h"
24 #include "llvm/CodeGen/MachineFunction.h"
25 #include "llvm/CodeGen/MachineInstrBuilder.h"
26 #include "llvm/CodeGen/MachineJumpTableInfo.h"
27 #include "llvm/CodeGen/MachineRegisterInfo.h"
28 #include "llvm/CodeGen/SelectionDAGISel.h"
29 #include "llvm/CodeGen/ValueTypes.h"
30 #include "llvm/IR/CallingConv.h"
31 #include "llvm/IR/Constants.h"
32 #include "llvm/IR/DerivedTypes.h"
33 #include "llvm/IR/Function.h"
34 #include "llvm/IR/GlobalAlias.h"
35 #include "llvm/IR/GlobalVariable.h"
36 #include "llvm/IR/Intrinsics.h"
37 #include "llvm/Support/Debug.h"
38 #include "llvm/Support/ErrorHandling.h"
39 #include "llvm/Support/raw_ostream.h"
44 const char *XCoreTargetLowering::
45 getTargetNodeName(unsigned Opcode) const
49 case XCoreISD::BL : return "XCoreISD::BL";
50 case XCoreISD::PCRelativeWrapper : return "XCoreISD::PCRelativeWrapper";
51 case XCoreISD::DPRelativeWrapper : return "XCoreISD::DPRelativeWrapper";
52 case XCoreISD::CPRelativeWrapper : return "XCoreISD::CPRelativeWrapper";
53 case XCoreISD::STWSP : return "XCoreISD::STWSP";
54 case XCoreISD::RETSP : return "XCoreISD::RETSP";
55 case XCoreISD::LADD : return "XCoreISD::LADD";
56 case XCoreISD::LSUB : return "XCoreISD::LSUB";
57 case XCoreISD::LMUL : return "XCoreISD::LMUL";
58 case XCoreISD::MACCU : return "XCoreISD::MACCU";
59 case XCoreISD::MACCS : return "XCoreISD::MACCS";
60 case XCoreISD::CRC8 : return "XCoreISD::CRC8";
61 case XCoreISD::BR_JT : return "XCoreISD::BR_JT";
62 case XCoreISD::BR_JT32 : return "XCoreISD::BR_JT32";
63 case XCoreISD::MEMBARRIER : return "XCoreISD::MEMBARRIER";
64 default : return NULL;
68 XCoreTargetLowering::XCoreTargetLowering(XCoreTargetMachine &XTM)
69 : TargetLowering(XTM, new XCoreTargetObjectFile()),
71 Subtarget(*XTM.getSubtargetImpl()) {
73 // Set up the register classes.
74 addRegisterClass(MVT::i32, &XCore::GRRegsRegClass);
76 // Compute derived properties from the register classes
77 computeRegisterProperties();
79 // Division is expensive
80 setIntDivIsCheap(false);
82 setStackPointerRegisterToSaveRestore(XCore::SP);
84 setSchedulingPreference(Sched::Source);
86 // Use i32 for setcc operations results (slt, sgt, ...).
87 setBooleanContents(ZeroOrOneBooleanContent);
88 setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
90 // XCore does not have the NodeTypes below.
91 setOperationAction(ISD::BR_CC, MVT::i32, Expand);
92 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
93 setOperationAction(ISD::ADDC, MVT::i32, Expand);
94 setOperationAction(ISD::ADDE, MVT::i32, Expand);
95 setOperationAction(ISD::SUBC, MVT::i32, Expand);
96 setOperationAction(ISD::SUBE, MVT::i32, Expand);
98 // Stop the combiner recombining select and set_cc
99 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
102 setOperationAction(ISD::ADD, MVT::i64, Custom);
103 setOperationAction(ISD::SUB, MVT::i64, Custom);
104 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Custom);
105 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Custom);
106 setOperationAction(ISD::MULHS, MVT::i32, Expand);
107 setOperationAction(ISD::MULHU, MVT::i32, Expand);
108 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
109 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
110 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
113 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
114 setOperationAction(ISD::ROTL , MVT::i32, Expand);
115 setOperationAction(ISD::ROTR , MVT::i32, Expand);
116 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
117 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
119 setOperationAction(ISD::TRAP, MVT::Other, Legal);
122 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
124 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
125 setOperationAction(ISD::BlockAddress, MVT::i32 , Custom);
127 // Conversion of i64 -> double produces constantpool nodes
128 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
131 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
132 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
133 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
135 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
136 setLoadExtAction(ISD::ZEXTLOAD, MVT::i16, Expand);
138 // Custom expand misaligned loads / stores.
139 setOperationAction(ISD::LOAD, MVT::i32, Custom);
140 setOperationAction(ISD::STORE, MVT::i32, Custom);
143 setOperationAction(ISD::VAEND, MVT::Other, Expand);
144 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
145 setOperationAction(ISD::VAARG, MVT::Other, Custom);
146 setOperationAction(ISD::VASTART, MVT::Other, Custom);
149 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
150 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
151 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
153 // Exception handling
154 setExceptionPointerRegister(XCore::R0);
155 setExceptionSelectorRegister(XCore::R1);
158 setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Custom);
160 // TRAMPOLINE is custom lowered.
161 setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
162 setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
164 // We want to custom lower some of our intrinsics.
165 setOperationAction(ISD::INTRINSIC_WO_CHAIN, MVT::Other, Custom);
167 MaxStoresPerMemset = MaxStoresPerMemsetOptSize = 4;
168 MaxStoresPerMemmove = MaxStoresPerMemmoveOptSize
169 = MaxStoresPerMemcpy = MaxStoresPerMemcpyOptSize = 2;
171 // We have target-specific dag combine patterns for the following nodes:
172 setTargetDAGCombine(ISD::STORE);
173 setTargetDAGCombine(ISD::ADD);
175 setMinFunctionAlignment(1);
178 bool XCoreTargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
179 if (Val.getOpcode() != ISD::LOAD)
182 EVT VT1 = Val.getValueType();
183 if (!VT1.isSimple() || !VT1.isInteger() ||
184 !VT2.isSimple() || !VT2.isInteger())
187 switch (VT1.getSimpleVT().SimpleTy) {
196 SDValue XCoreTargetLowering::
197 LowerOperation(SDValue Op, SelectionDAG &DAG) const {
198 switch (Op.getOpcode())
200 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
201 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
202 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
203 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
204 case ISD::LOAD: return LowerLOAD(Op, DAG);
205 case ISD::STORE: return LowerSTORE(Op, DAG);
206 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
207 case ISD::VAARG: return LowerVAARG(Op, DAG);
208 case ISD::VASTART: return LowerVASTART(Op, DAG);
209 case ISD::SMUL_LOHI: return LowerSMUL_LOHI(Op, DAG);
210 case ISD::UMUL_LOHI: return LowerUMUL_LOHI(Op, DAG);
211 // FIXME: Remove these when LegalizeDAGTypes lands.
213 case ISD::SUB: return ExpandADDSUB(Op.getNode(), DAG);
214 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
215 case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
216 case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG);
217 case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG);
218 case ISD::INTRINSIC_WO_CHAIN: return LowerINTRINSIC_WO_CHAIN(Op, DAG);
219 case ISD::ATOMIC_FENCE: return LowerATOMIC_FENCE(Op, DAG);
221 llvm_unreachable("unimplemented operand");
225 /// ReplaceNodeResults - Replace the results of node with an illegal result
226 /// type with new values built out of custom code.
227 void XCoreTargetLowering::ReplaceNodeResults(SDNode *N,
228 SmallVectorImpl<SDValue>&Results,
229 SelectionDAG &DAG) const {
230 switch (N->getOpcode()) {
232 llvm_unreachable("Don't know how to custom expand this!");
235 Results.push_back(ExpandADDSUB(N, DAG));
240 //===----------------------------------------------------------------------===//
241 // Misc Lower Operation implementation
242 //===----------------------------------------------------------------------===//
244 SDValue XCoreTargetLowering::
245 LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const
248 SDValue Cond = DAG.getNode(ISD::SETCC, dl, MVT::i32, Op.getOperand(2),
249 Op.getOperand(3), Op.getOperand(4));
250 return DAG.getNode(ISD::SELECT, dl, MVT::i32, Cond, Op.getOperand(0),
254 SDValue XCoreTargetLowering::
255 getGlobalAddressWrapper(SDValue GA, const GlobalValue *GV,
256 SelectionDAG &DAG) const
258 // FIXME there is no actual debug info here
260 const GlobalValue *UnderlyingGV = GV;
261 // If GV is an alias then use the aliasee to determine the wrapper type
262 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
263 UnderlyingGV = GA->resolveAliasedGlobal();
264 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(UnderlyingGV)) {
265 if (GVar->isConstant())
266 return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, GA);
267 return DAG.getNode(XCoreISD::DPRelativeWrapper, dl, MVT::i32, GA);
269 return DAG.getNode(XCoreISD::PCRelativeWrapper, dl, MVT::i32, GA);
272 static bool IsSmallObject(const GlobalValue *GV, const XCoreTargetLowering &XTL) {
273 if (XTL.getTargetMachine().getCodeModel() == CodeModel::Small)
276 Type *ObjType = GV->getType()->getPointerElementType();
277 if (!ObjType->isSized())
280 unsigned ObjSize = XTL.getDataLayout()->getTypeAllocSize(ObjType);
281 return ObjSize < CodeModelLargeSize && ObjSize != 0;
284 SDValue XCoreTargetLowering::
285 LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const
287 const GlobalAddressSDNode *GN = cast<GlobalAddressSDNode>(Op);
288 const GlobalValue *GV = GN->getGlobal();
290 int64_t Offset = GN->getOffset();
291 if (IsSmallObject(GV, *this)) {
292 // We can only fold positive offsets that are a multiple of the word size.
293 int64_t FoldedOffset = std::max(Offset & ~3, (int64_t)0);
294 SDValue GA = DAG.getTargetGlobalAddress(GV, DL, MVT::i32, FoldedOffset);
295 GA = getGlobalAddressWrapper(GA, GV, DAG);
296 // Handle the rest of the offset.
297 if (Offset != FoldedOffset) {
298 SDValue Remaining = DAG.getConstant(Offset - FoldedOffset, MVT::i32);
299 GA = DAG.getNode(ISD::ADD, DL, MVT::i32, GA, Remaining);
303 // Ideally we would not fold in offset with an index <= 11.
304 Type *Ty = Type::getInt8PtrTy(*DAG.getContext());
305 Constant *GA = ConstantExpr::getBitCast(const_cast<GlobalValue*>(GV), Ty);
306 Ty = Type::getInt32Ty(*DAG.getContext());
307 Constant *Idx = ConstantInt::get(Ty, Offset);
308 Constant *GAI = ConstantExpr::getGetElementPtr(GA, Idx);
309 SDValue CP = DAG.getConstantPool(GAI, MVT::i32);
310 return DAG.getLoad(getPointerTy(), DL, DAG.getEntryNode(), CP,
311 MachinePointerInfo(), false, false, false, 0);
315 SDValue XCoreTargetLowering::
316 LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const
320 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
321 SDValue Result = DAG.getTargetBlockAddress(BA, getPointerTy());
323 return DAG.getNode(XCoreISD::PCRelativeWrapper, DL, getPointerTy(), Result);
326 SDValue XCoreTargetLowering::
327 LowerConstantPool(SDValue Op, SelectionDAG &DAG) const
329 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
330 // FIXME there isn't really debug info here
332 EVT PtrVT = Op.getValueType();
334 if (CP->isMachineConstantPoolEntry()) {
335 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
336 CP->getAlignment(), CP->getOffset());
338 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
339 CP->getAlignment(), CP->getOffset());
341 return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, Res);
344 unsigned XCoreTargetLowering::getJumpTableEncoding() const {
345 return MachineJumpTableInfo::EK_Inline;
348 SDValue XCoreTargetLowering::
349 LowerBR_JT(SDValue Op, SelectionDAG &DAG) const
351 SDValue Chain = Op.getOperand(0);
352 SDValue Table = Op.getOperand(1);
353 SDValue Index = Op.getOperand(2);
355 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
356 unsigned JTI = JT->getIndex();
357 MachineFunction &MF = DAG.getMachineFunction();
358 const MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
359 SDValue TargetJT = DAG.getTargetJumpTable(JT->getIndex(), MVT::i32);
361 unsigned NumEntries = MJTI->getJumpTables()[JTI].MBBs.size();
362 if (NumEntries <= 32) {
363 return DAG.getNode(XCoreISD::BR_JT, dl, MVT::Other, Chain, TargetJT, Index);
365 assert((NumEntries >> 31) == 0);
366 SDValue ScaledIndex = DAG.getNode(ISD::SHL, dl, MVT::i32, Index,
367 DAG.getConstant(1, MVT::i32));
368 return DAG.getNode(XCoreISD::BR_JT32, dl, MVT::Other, Chain, TargetJT,
372 SDValue XCoreTargetLowering::
373 lowerLoadWordFromAlignedBasePlusOffset(SDLoc DL, SDValue Chain, SDValue Base,
374 int64_t Offset, SelectionDAG &DAG) const
376 if ((Offset & 0x3) == 0) {
377 return DAG.getLoad(getPointerTy(), DL, Chain, Base, MachinePointerInfo(),
378 false, false, false, 0);
380 // Lower to pair of consecutive word aligned loads plus some bit shifting.
381 int32_t HighOffset = RoundUpToAlignment(Offset, 4);
382 int32_t LowOffset = HighOffset - 4;
383 SDValue LowAddr, HighAddr;
384 if (GlobalAddressSDNode *GASD =
385 dyn_cast<GlobalAddressSDNode>(Base.getNode())) {
386 LowAddr = DAG.getGlobalAddress(GASD->getGlobal(), DL, Base.getValueType(),
388 HighAddr = DAG.getGlobalAddress(GASD->getGlobal(), DL, Base.getValueType(),
391 LowAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, Base,
392 DAG.getConstant(LowOffset, MVT::i32));
393 HighAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, Base,
394 DAG.getConstant(HighOffset, MVT::i32));
396 SDValue LowShift = DAG.getConstant((Offset - LowOffset) * 8, MVT::i32);
397 SDValue HighShift = DAG.getConstant((HighOffset - Offset) * 8, MVT::i32);
399 SDValue Low = DAG.getLoad(getPointerTy(), DL, Chain,
400 LowAddr, MachinePointerInfo(),
401 false, false, false, 0);
402 SDValue High = DAG.getLoad(getPointerTy(), DL, Chain,
403 HighAddr, MachinePointerInfo(),
404 false, false, false, 0);
405 SDValue LowShifted = DAG.getNode(ISD::SRL, DL, MVT::i32, Low, LowShift);
406 SDValue HighShifted = DAG.getNode(ISD::SHL, DL, MVT::i32, High, HighShift);
407 SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i32, LowShifted, HighShifted);
408 Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Low.getValue(1),
410 SDValue Ops[] = { Result, Chain };
411 return DAG.getMergeValues(Ops, 2, DL);
414 static bool isWordAligned(SDValue Value, SelectionDAG &DAG)
416 APInt KnownZero, KnownOne;
417 DAG.ComputeMaskedBits(Value, KnownZero, KnownOne);
418 return KnownZero.countTrailingOnes() >= 2;
421 SDValue XCoreTargetLowering::
422 LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
423 const TargetLowering &TLI = DAG.getTargetLoweringInfo();
424 LoadSDNode *LD = cast<LoadSDNode>(Op);
425 assert(LD->getExtensionType() == ISD::NON_EXTLOAD &&
426 "Unexpected extension type");
427 assert(LD->getMemoryVT() == MVT::i32 && "Unexpected load EVT");
428 if (allowsUnalignedMemoryAccesses(LD->getMemoryVT()))
431 unsigned ABIAlignment = getDataLayout()->
432 getABITypeAlignment(LD->getMemoryVT().getTypeForEVT(*DAG.getContext()));
433 // Leave aligned load alone.
434 if (LD->getAlignment() >= ABIAlignment)
437 SDValue Chain = LD->getChain();
438 SDValue BasePtr = LD->getBasePtr();
441 if (!LD->isVolatile()) {
442 const GlobalValue *GV;
444 if (DAG.isBaseWithConstantOffset(BasePtr) &&
445 isWordAligned(BasePtr->getOperand(0), DAG)) {
446 SDValue NewBasePtr = BasePtr->getOperand(0);
447 Offset = cast<ConstantSDNode>(BasePtr->getOperand(1))->getSExtValue();
448 return lowerLoadWordFromAlignedBasePlusOffset(DL, Chain, NewBasePtr,
451 if (TLI.isGAPlusOffset(BasePtr.getNode(), GV, Offset) &&
452 MinAlign(GV->getAlignment(), 4) == 4) {
453 SDValue NewBasePtr = DAG.getGlobalAddress(GV, DL,
454 BasePtr->getValueType(0));
455 return lowerLoadWordFromAlignedBasePlusOffset(DL, Chain, NewBasePtr,
460 if (LD->getAlignment() == 2) {
461 SDValue Low = DAG.getExtLoad(ISD::ZEXTLOAD, DL, MVT::i32, Chain,
462 BasePtr, LD->getPointerInfo(), MVT::i16,
463 LD->isVolatile(), LD->isNonTemporal(), 2);
464 SDValue HighAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, BasePtr,
465 DAG.getConstant(2, MVT::i32));
466 SDValue High = DAG.getExtLoad(ISD::EXTLOAD, DL, MVT::i32, Chain,
468 LD->getPointerInfo().getWithOffset(2),
469 MVT::i16, LD->isVolatile(),
470 LD->isNonTemporal(), 2);
471 SDValue HighShifted = DAG.getNode(ISD::SHL, DL, MVT::i32, High,
472 DAG.getConstant(16, MVT::i32));
473 SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i32, Low, HighShifted);
474 Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Low.getValue(1),
476 SDValue Ops[] = { Result, Chain };
477 return DAG.getMergeValues(Ops, 2, DL);
480 // Lower to a call to __misaligned_load(BasePtr).
481 Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
482 TargetLowering::ArgListTy Args;
483 TargetLowering::ArgListEntry Entry;
486 Entry.Node = BasePtr;
487 Args.push_back(Entry);
489 TargetLowering::CallLoweringInfo CLI(Chain, IntPtrTy, false, false,
490 false, false, 0, CallingConv::C, /*isTailCall=*/false,
491 /*doesNotRet=*/false, /*isReturnValueUsed=*/true,
492 DAG.getExternalSymbol("__misaligned_load", getPointerTy()),
494 std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
497 { CallResult.first, CallResult.second };
499 return DAG.getMergeValues(Ops, 2, DL);
502 SDValue XCoreTargetLowering::
503 LowerSTORE(SDValue Op, SelectionDAG &DAG) const
505 StoreSDNode *ST = cast<StoreSDNode>(Op);
506 assert(!ST->isTruncatingStore() && "Unexpected store type");
507 assert(ST->getMemoryVT() == MVT::i32 && "Unexpected store EVT");
508 if (allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
511 unsigned ABIAlignment = getDataLayout()->
512 getABITypeAlignment(ST->getMemoryVT().getTypeForEVT(*DAG.getContext()));
513 // Leave aligned store alone.
514 if (ST->getAlignment() >= ABIAlignment) {
517 SDValue Chain = ST->getChain();
518 SDValue BasePtr = ST->getBasePtr();
519 SDValue Value = ST->getValue();
522 if (ST->getAlignment() == 2) {
524 SDValue High = DAG.getNode(ISD::SRL, dl, MVT::i32, Value,
525 DAG.getConstant(16, MVT::i32));
526 SDValue StoreLow = DAG.getTruncStore(Chain, dl, Low, BasePtr,
527 ST->getPointerInfo(), MVT::i16,
528 ST->isVolatile(), ST->isNonTemporal(),
530 SDValue HighAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, BasePtr,
531 DAG.getConstant(2, MVT::i32));
532 SDValue StoreHigh = DAG.getTruncStore(Chain, dl, High, HighAddr,
533 ST->getPointerInfo().getWithOffset(2),
534 MVT::i16, ST->isVolatile(),
535 ST->isNonTemporal(), 2);
536 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, StoreLow, StoreHigh);
539 // Lower to a call to __misaligned_store(BasePtr, Value).
540 Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
541 TargetLowering::ArgListTy Args;
542 TargetLowering::ArgListEntry Entry;
545 Entry.Node = BasePtr;
546 Args.push_back(Entry);
549 Args.push_back(Entry);
551 TargetLowering::CallLoweringInfo CLI(Chain,
552 Type::getVoidTy(*DAG.getContext()), false, false,
553 false, false, 0, CallingConv::C, /*isTailCall=*/false,
554 /*doesNotRet=*/false, /*isReturnValueUsed=*/true,
555 DAG.getExternalSymbol("__misaligned_store", getPointerTy()),
557 std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
559 return CallResult.second;
562 SDValue XCoreTargetLowering::
563 LowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const
565 assert(Op.getValueType() == MVT::i32 && Op.getOpcode() == ISD::SMUL_LOHI &&
566 "Unexpected operand to lower!");
568 SDValue LHS = Op.getOperand(0);
569 SDValue RHS = Op.getOperand(1);
570 SDValue Zero = DAG.getConstant(0, MVT::i32);
571 SDValue Hi = DAG.getNode(XCoreISD::MACCS, dl,
572 DAG.getVTList(MVT::i32, MVT::i32), Zero, Zero,
574 SDValue Lo(Hi.getNode(), 1);
575 SDValue Ops[] = { Lo, Hi };
576 return DAG.getMergeValues(Ops, 2, dl);
579 SDValue XCoreTargetLowering::
580 LowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const
582 assert(Op.getValueType() == MVT::i32 && Op.getOpcode() == ISD::UMUL_LOHI &&
583 "Unexpected operand to lower!");
585 SDValue LHS = Op.getOperand(0);
586 SDValue RHS = Op.getOperand(1);
587 SDValue Zero = DAG.getConstant(0, MVT::i32);
588 SDValue Hi = DAG.getNode(XCoreISD::LMUL, dl,
589 DAG.getVTList(MVT::i32, MVT::i32), LHS, RHS,
591 SDValue Lo(Hi.getNode(), 1);
592 SDValue Ops[] = { Lo, Hi };
593 return DAG.getMergeValues(Ops, 2, dl);
596 /// isADDADDMUL - Return whether Op is in a form that is equivalent to
597 /// add(add(mul(x,y),a),b). If requireIntermediatesHaveOneUse is true then
598 /// each intermediate result in the calculation must also have a single use.
599 /// If the Op is in the correct form the constituent parts are written to Mul0,
600 /// Mul1, Addend0 and Addend1.
602 isADDADDMUL(SDValue Op, SDValue &Mul0, SDValue &Mul1, SDValue &Addend0,
603 SDValue &Addend1, bool requireIntermediatesHaveOneUse)
605 if (Op.getOpcode() != ISD::ADD)
607 SDValue N0 = Op.getOperand(0);
608 SDValue N1 = Op.getOperand(1);
611 if (N0.getOpcode() == ISD::ADD) {
614 } else if (N1.getOpcode() == ISD::ADD) {
620 if (requireIntermediatesHaveOneUse && !AddOp.hasOneUse())
622 if (OtherOp.getOpcode() == ISD::MUL) {
623 // add(add(a,b),mul(x,y))
624 if (requireIntermediatesHaveOneUse && !OtherOp.hasOneUse())
626 Mul0 = OtherOp.getOperand(0);
627 Mul1 = OtherOp.getOperand(1);
628 Addend0 = AddOp.getOperand(0);
629 Addend1 = AddOp.getOperand(1);
632 if (AddOp.getOperand(0).getOpcode() == ISD::MUL) {
633 // add(add(mul(x,y),a),b)
634 if (requireIntermediatesHaveOneUse && !AddOp.getOperand(0).hasOneUse())
636 Mul0 = AddOp.getOperand(0).getOperand(0);
637 Mul1 = AddOp.getOperand(0).getOperand(1);
638 Addend0 = AddOp.getOperand(1);
642 if (AddOp.getOperand(1).getOpcode() == ISD::MUL) {
643 // add(add(a,mul(x,y)),b)
644 if (requireIntermediatesHaveOneUse && !AddOp.getOperand(1).hasOneUse())
646 Mul0 = AddOp.getOperand(1).getOperand(0);
647 Mul1 = AddOp.getOperand(1).getOperand(1);
648 Addend0 = AddOp.getOperand(0);
655 SDValue XCoreTargetLowering::
656 TryExpandADDWithMul(SDNode *N, SelectionDAG &DAG) const
660 if (N->getOperand(0).getOpcode() == ISD::MUL) {
661 Mul = N->getOperand(0);
662 Other = N->getOperand(1);
663 } else if (N->getOperand(1).getOpcode() == ISD::MUL) {
664 Mul = N->getOperand(1);
665 Other = N->getOperand(0);
670 SDValue LL, RL, AddendL, AddendH;
671 LL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
672 Mul.getOperand(0), DAG.getConstant(0, MVT::i32));
673 RL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
674 Mul.getOperand(1), DAG.getConstant(0, MVT::i32));
675 AddendL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
676 Other, DAG.getConstant(0, MVT::i32));
677 AddendH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
678 Other, DAG.getConstant(1, MVT::i32));
679 APInt HighMask = APInt::getHighBitsSet(64, 32);
680 unsigned LHSSB = DAG.ComputeNumSignBits(Mul.getOperand(0));
681 unsigned RHSSB = DAG.ComputeNumSignBits(Mul.getOperand(1));
682 if (DAG.MaskedValueIsZero(Mul.getOperand(0), HighMask) &&
683 DAG.MaskedValueIsZero(Mul.getOperand(1), HighMask)) {
684 // The inputs are both zero-extended.
685 SDValue Hi = DAG.getNode(XCoreISD::MACCU, dl,
686 DAG.getVTList(MVT::i32, MVT::i32), AddendH,
688 SDValue Lo(Hi.getNode(), 1);
689 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
691 if (LHSSB > 32 && RHSSB > 32) {
692 // The inputs are both sign-extended.
693 SDValue Hi = DAG.getNode(XCoreISD::MACCS, dl,
694 DAG.getVTList(MVT::i32, MVT::i32), AddendH,
696 SDValue Lo(Hi.getNode(), 1);
697 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
700 LH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
701 Mul.getOperand(0), DAG.getConstant(1, MVT::i32));
702 RH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
703 Mul.getOperand(1), DAG.getConstant(1, MVT::i32));
704 SDValue Hi = DAG.getNode(XCoreISD::MACCU, dl,
705 DAG.getVTList(MVT::i32, MVT::i32), AddendH,
707 SDValue Lo(Hi.getNode(), 1);
708 RH = DAG.getNode(ISD::MUL, dl, MVT::i32, LL, RH);
709 LH = DAG.getNode(ISD::MUL, dl, MVT::i32, LH, RL);
710 Hi = DAG.getNode(ISD::ADD, dl, MVT::i32, Hi, RH);
711 Hi = DAG.getNode(ISD::ADD, dl, MVT::i32, Hi, LH);
712 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
715 SDValue XCoreTargetLowering::
716 ExpandADDSUB(SDNode *N, SelectionDAG &DAG) const
718 assert(N->getValueType(0) == MVT::i64 &&
719 (N->getOpcode() == ISD::ADD || N->getOpcode() == ISD::SUB) &&
720 "Unknown operand to lower!");
722 if (N->getOpcode() == ISD::ADD) {
723 SDValue Result = TryExpandADDWithMul(N, DAG);
724 if (Result.getNode() != 0)
730 // Extract components
731 SDValue LHSL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
732 N->getOperand(0), DAG.getConstant(0, MVT::i32));
733 SDValue LHSH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
734 N->getOperand(0), DAG.getConstant(1, MVT::i32));
735 SDValue RHSL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
736 N->getOperand(1), DAG.getConstant(0, MVT::i32));
737 SDValue RHSH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
738 N->getOperand(1), DAG.getConstant(1, MVT::i32));
741 unsigned Opcode = (N->getOpcode() == ISD::ADD) ? XCoreISD::LADD :
743 SDValue Zero = DAG.getConstant(0, MVT::i32);
744 SDValue Lo = DAG.getNode(Opcode, dl, DAG.getVTList(MVT::i32, MVT::i32),
746 SDValue Carry(Lo.getNode(), 1);
748 SDValue Hi = DAG.getNode(Opcode, dl, DAG.getVTList(MVT::i32, MVT::i32),
750 SDValue Ignored(Hi.getNode(), 1);
752 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
755 SDValue XCoreTargetLowering::
756 LowerVAARG(SDValue Op, SelectionDAG &DAG) const
758 // Whist llvm does not support aggregate varargs we can ignore
759 // the possibility of the ValueType being an implicit byVal vararg.
760 SDNode *Node = Op.getNode();
761 EVT VT = Node->getValueType(0); // not an aggregate
762 SDValue InChain = Node->getOperand(0);
763 SDValue VAListPtr = Node->getOperand(1);
764 EVT PtrVT = VAListPtr.getValueType();
765 const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
767 SDValue VAList = DAG.getLoad(PtrVT, dl, InChain,
768 VAListPtr, MachinePointerInfo(SV),
769 false, false, false, 0);
770 // Increment the pointer, VAList, to the next vararg
771 SDValue nextPtr = DAG.getNode(ISD::ADD, dl, PtrVT, VAList,
772 DAG.getIntPtrConstant(VT.getSizeInBits() / 8));
773 // Store the incremented VAList to the legalized pointer
774 InChain = DAG.getStore(VAList.getValue(1), dl, nextPtr, VAListPtr,
775 MachinePointerInfo(SV), false, false, 0);
776 // Load the actual argument out of the pointer VAList
777 return DAG.getLoad(VT, dl, InChain, VAList, MachinePointerInfo(),
778 false, false, false, 0);
781 SDValue XCoreTargetLowering::
782 LowerVASTART(SDValue Op, SelectionDAG &DAG) const
785 // vastart stores the address of the VarArgsFrameIndex slot into the
786 // memory location argument
787 MachineFunction &MF = DAG.getMachineFunction();
788 XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>();
789 SDValue Addr = DAG.getFrameIndex(XFI->getVarArgsFrameIndex(), MVT::i32);
790 return DAG.getStore(Op.getOperand(0), dl, Addr, Op.getOperand(1),
791 MachinePointerInfo(), false, false, 0);
794 SDValue XCoreTargetLowering::LowerFRAMEADDR(SDValue Op,
795 SelectionDAG &DAG) const {
796 // This nodes represent llvm.frameaddress on the DAG.
797 // It takes one operand, the index of the frame address to return.
798 // An index of zero corresponds to the current function's frame address.
799 // An index of one to the parent's frame address, and so on.
800 // Depths > 0 not supported yet!
801 if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() > 0)
804 MachineFunction &MF = DAG.getMachineFunction();
805 const TargetRegisterInfo *RegInfo = getTargetMachine().getRegisterInfo();
806 return DAG.getCopyFromReg(DAG.getEntryNode(), SDLoc(Op),
807 RegInfo->getFrameRegister(MF), MVT::i32);
810 SDValue XCoreTargetLowering::
811 LowerRETURNADDR(SDValue Op, SelectionDAG &DAG) const {
812 // This nodes represent llvm.returnaddress on the DAG.
813 // It takes one operand, the index of the return address to return.
814 // An index of zero corresponds to the current function's return address.
815 // An index of one to the parent's return address, and so on.
816 // Depths > 0 not supported yet!
817 if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() > 0)
820 MachineFunction &MF = DAG.getMachineFunction();
821 XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>();
822 int FI = XFI->createLRSpillSlot(MF);
823 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
824 return DAG.getLoad(getPointerTy(), SDLoc(Op), DAG.getEntryNode(), FIN,
825 MachinePointerInfo::getFixedStack(FI), false, false,
829 SDValue XCoreTargetLowering::
830 LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const {
831 return Op.getOperand(0);
834 SDValue XCoreTargetLowering::
835 LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const {
836 SDValue Chain = Op.getOperand(0);
837 SDValue Trmp = Op.getOperand(1); // trampoline
838 SDValue FPtr = Op.getOperand(2); // nested function
839 SDValue Nest = Op.getOperand(3); // 'nest' parameter value
841 const Value *TrmpAddr = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
844 // LDAPF_u10 r11, nest
845 // LDW_2rus r11, r11[0]
846 // STWSP_ru6 r11, sp[0]
847 // LDAPF_u10 r11, fptr
848 // LDW_2rus r11, r11[0]
854 SDValue OutChains[5];
859 OutChains[0] = DAG.getStore(Chain, dl, DAG.getConstant(0x0a3cd805, MVT::i32),
860 Addr, MachinePointerInfo(TrmpAddr), false, false,
863 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
864 DAG.getConstant(4, MVT::i32));
865 OutChains[1] = DAG.getStore(Chain, dl, DAG.getConstant(0xd80456c0, MVT::i32),
866 Addr, MachinePointerInfo(TrmpAddr, 4), false,
869 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
870 DAG.getConstant(8, MVT::i32));
871 OutChains[2] = DAG.getStore(Chain, dl, DAG.getConstant(0x27fb0a3c, MVT::i32),
872 Addr, MachinePointerInfo(TrmpAddr, 8), false,
875 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
876 DAG.getConstant(12, MVT::i32));
877 OutChains[3] = DAG.getStore(Chain, dl, Nest, Addr,
878 MachinePointerInfo(TrmpAddr, 12), false, false,
881 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
882 DAG.getConstant(16, MVT::i32));
883 OutChains[4] = DAG.getStore(Chain, dl, FPtr, Addr,
884 MachinePointerInfo(TrmpAddr, 16), false, false,
887 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains, 5);
890 SDValue XCoreTargetLowering::
891 LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const {
893 unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
895 case Intrinsic::xcore_crc8:
896 EVT VT = Op.getValueType();
898 DAG.getNode(XCoreISD::CRC8, DL, DAG.getVTList(VT, VT),
899 Op.getOperand(1), Op.getOperand(2) , Op.getOperand(3));
900 SDValue Crc(Data.getNode(), 1);
901 SDValue Results[] = { Crc, Data };
902 return DAG.getMergeValues(Results, 2, DL);
907 SDValue XCoreTargetLowering::
908 LowerATOMIC_FENCE(SDValue Op, SelectionDAG &DAG) const {
910 return DAG.getNode(XCoreISD::MEMBARRIER, DL, MVT::Other, Op.getOperand(0));
913 //===----------------------------------------------------------------------===//
914 // Calling Convention Implementation
915 //===----------------------------------------------------------------------===//
917 #include "XCoreGenCallingConv.inc"
919 //===----------------------------------------------------------------------===//
920 // Call Calling Convention Implementation
921 //===----------------------------------------------------------------------===//
923 /// XCore call implementation
925 XCoreTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
926 SmallVectorImpl<SDValue> &InVals) const {
927 SelectionDAG &DAG = CLI.DAG;
929 SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
930 SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
931 SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
932 SDValue Chain = CLI.Chain;
933 SDValue Callee = CLI.Callee;
934 bool &isTailCall = CLI.IsTailCall;
935 CallingConv::ID CallConv = CLI.CallConv;
936 bool isVarArg = CLI.IsVarArg;
938 // XCore target does not yet support tail call optimization.
941 // For now, only CallingConv::C implemented
945 llvm_unreachable("Unsupported calling convention");
946 case CallingConv::Fast:
948 return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall,
949 Outs, OutVals, Ins, dl, DAG, InVals);
953 /// LowerCCCCallTo - functions arguments are copied from virtual
954 /// regs to (physical regs)/(stack frame), CALLSEQ_START and
955 /// CALLSEQ_END are emitted.
956 /// TODO: isTailCall, sret.
958 XCoreTargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
959 CallingConv::ID CallConv, bool isVarArg,
961 const SmallVectorImpl<ISD::OutputArg> &Outs,
962 const SmallVectorImpl<SDValue> &OutVals,
963 const SmallVectorImpl<ISD::InputArg> &Ins,
964 SDLoc dl, SelectionDAG &DAG,
965 SmallVectorImpl<SDValue> &InVals) const {
967 // Analyze operands of the call, assigning locations to each operand.
968 SmallVector<CCValAssign, 16> ArgLocs;
969 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
970 getTargetMachine(), ArgLocs, *DAG.getContext());
972 // The ABI dictates there should be one stack slot available to the callee
973 // on function entry (for saving lr).
974 CCInfo.AllocateStack(4, 4);
976 CCInfo.AnalyzeCallOperands(Outs, CC_XCore);
978 // Get a count of how many bytes are to be pushed on the stack.
979 unsigned NumBytes = CCInfo.getNextStackOffset();
981 Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(NumBytes,
982 getPointerTy(), true), dl);
984 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
985 SmallVector<SDValue, 12> MemOpChains;
987 // Walk the register/memloc assignments, inserting copies/loads.
988 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
989 CCValAssign &VA = ArgLocs[i];
990 SDValue Arg = OutVals[i];
992 // Promote the value if needed.
993 switch (VA.getLocInfo()) {
994 default: llvm_unreachable("Unknown loc info!");
995 case CCValAssign::Full: break;
996 case CCValAssign::SExt:
997 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
999 case CCValAssign::ZExt:
1000 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
1002 case CCValAssign::AExt:
1003 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
1007 // Arguments that can be passed on register must be kept at
1008 // RegsToPass vector
1009 if (VA.isRegLoc()) {
1010 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
1012 assert(VA.isMemLoc());
1014 int Offset = VA.getLocMemOffset();
1016 MemOpChains.push_back(DAG.getNode(XCoreISD::STWSP, dl, MVT::Other,
1018 DAG.getConstant(Offset/4, MVT::i32)));
1022 // Transform all store nodes into one single node because
1023 // all store nodes are independent of each other.
1024 if (!MemOpChains.empty())
1025 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1026 &MemOpChains[0], MemOpChains.size());
1028 // Build a sequence of copy-to-reg nodes chained together with token
1029 // chain and flag operands which copy the outgoing args into registers.
1030 // The InFlag in necessary since all emitted instructions must be
1033 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
1034 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
1035 RegsToPass[i].second, InFlag);
1036 InFlag = Chain.getValue(1);
1039 // If the callee is a GlobalAddress node (quite common, every direct call is)
1040 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
1041 // Likewise ExternalSymbol -> TargetExternalSymbol.
1042 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
1043 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i32);
1044 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
1045 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
1047 // XCoreBranchLink = #chain, #target_address, #opt_in_flags...
1048 // = Chain, Callee, Reg#1, Reg#2, ...
1050 // Returns a chain & a flag for retval copy to use.
1051 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
1052 SmallVector<SDValue, 8> Ops;
1053 Ops.push_back(Chain);
1054 Ops.push_back(Callee);
1056 // Add argument registers to the end of the list so that they are
1057 // known live into the call.
1058 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1059 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1060 RegsToPass[i].second.getValueType()));
1062 if (InFlag.getNode())
1063 Ops.push_back(InFlag);
1065 Chain = DAG.getNode(XCoreISD::BL, dl, NodeTys, &Ops[0], Ops.size());
1066 InFlag = Chain.getValue(1);
1068 // Create the CALLSEQ_END node.
1069 Chain = DAG.getCALLSEQ_END(Chain,
1070 DAG.getConstant(NumBytes, getPointerTy(), true),
1071 DAG.getConstant(0, getPointerTy(), true),
1073 InFlag = Chain.getValue(1);
1075 // Handle result values, copying them out of physregs into vregs that we
1077 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
1078 Ins, dl, DAG, InVals);
1081 /// LowerCallResult - Lower the result values of a call into the
1082 /// appropriate copies out of appropriate physical registers.
1084 XCoreTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
1085 CallingConv::ID CallConv, bool isVarArg,
1086 const SmallVectorImpl<ISD::InputArg> &Ins,
1087 SDLoc dl, SelectionDAG &DAG,
1088 SmallVectorImpl<SDValue> &InVals) const {
1090 // Assign locations to each value returned by this call.
1091 SmallVector<CCValAssign, 16> RVLocs;
1092 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1093 getTargetMachine(), RVLocs, *DAG.getContext());
1095 CCInfo.AnalyzeCallResult(Ins, RetCC_XCore);
1097 // Copy all of the result registers out of their specified physreg.
1098 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1099 Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
1100 RVLocs[i].getValVT(), InFlag).getValue(1);
1101 InFlag = Chain.getValue(2);
1102 InVals.push_back(Chain.getValue(0));
1108 //===----------------------------------------------------------------------===//
1109 // Formal Arguments Calling Convention Implementation
1110 //===----------------------------------------------------------------------===//
1113 struct ArgDataPair { SDValue SDV; ISD::ArgFlagsTy Flags; };
1116 /// XCore formal arguments implementation
1118 XCoreTargetLowering::LowerFormalArguments(SDValue Chain,
1119 CallingConv::ID CallConv,
1121 const SmallVectorImpl<ISD::InputArg> &Ins,
1124 SmallVectorImpl<SDValue> &InVals)
1129 llvm_unreachable("Unsupported calling convention");
1130 case CallingConv::C:
1131 case CallingConv::Fast:
1132 return LowerCCCArguments(Chain, CallConv, isVarArg,
1133 Ins, dl, DAG, InVals);
1137 /// LowerCCCArguments - transform physical registers into
1138 /// virtual registers and generate load operations for
1139 /// arguments places on the stack.
1142 XCoreTargetLowering::LowerCCCArguments(SDValue Chain,
1143 CallingConv::ID CallConv,
1145 const SmallVectorImpl<ISD::InputArg>
1149 SmallVectorImpl<SDValue> &InVals) const {
1150 MachineFunction &MF = DAG.getMachineFunction();
1151 MachineFrameInfo *MFI = MF.getFrameInfo();
1152 MachineRegisterInfo &RegInfo = MF.getRegInfo();
1154 // Assign locations to all of the incoming arguments.
1155 SmallVector<CCValAssign, 16> ArgLocs;
1156 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1157 getTargetMachine(), ArgLocs, *DAG.getContext());
1159 CCInfo.AnalyzeFormalArguments(Ins, CC_XCore);
1161 unsigned StackSlotSize = XCoreFrameLowering::stackSlotSize();
1163 unsigned LRSaveSize = StackSlotSize;
1165 // All getCopyFromReg ops must precede any getMemcpys to prevent the
1166 // scheduler clobbering a register before it has been copied.
1168 // 1. CopyFromReg (and load) arg & vararg registers.
1169 // 2. Chain CopyFromReg nodes into a TokenFactor.
1170 // 3. Memcpy 'byVal' args & push final InVals.
1171 // 4. Chain mem ops nodes into a TokenFactor.
1172 SmallVector<SDValue, 4> CFRegNode;
1173 SmallVector<ArgDataPair, 4> ArgData;
1174 SmallVector<SDValue, 4> MemOps;
1176 // 1a. CopyFromReg (and load) arg registers.
1177 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1179 CCValAssign &VA = ArgLocs[i];
1182 if (VA.isRegLoc()) {
1183 // Arguments passed in registers
1184 EVT RegVT = VA.getLocVT();
1185 switch (RegVT.getSimpleVT().SimpleTy) {
1189 errs() << "LowerFormalArguments Unhandled argument type: "
1190 << RegVT.getSimpleVT().SimpleTy << "\n";
1192 llvm_unreachable(0);
1195 unsigned VReg = RegInfo.createVirtualRegister(&XCore::GRRegsRegClass);
1196 RegInfo.addLiveIn(VA.getLocReg(), VReg);
1197 ArgIn = DAG.getCopyFromReg(Chain, dl, VReg, RegVT);
1198 CFRegNode.push_back(ArgIn.getValue(ArgIn->getNumValues() - 1));
1202 assert(VA.isMemLoc());
1203 // Load the argument to a virtual register
1204 unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
1205 if (ObjSize > StackSlotSize) {
1206 errs() << "LowerFormalArguments Unhandled argument type: "
1207 << EVT(VA.getLocVT()).getEVTString()
1210 // Create the frame index object for this incoming parameter...
1211 int FI = MFI->CreateFixedObject(ObjSize,
1212 LRSaveSize + VA.getLocMemOffset(),
1215 // Create the SelectionDAG nodes corresponding to a load
1216 //from this parameter
1217 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
1218 ArgIn = DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
1219 MachinePointerInfo::getFixedStack(FI),
1220 false, false, false, 0);
1222 const ArgDataPair ADP = { ArgIn, Ins[i].Flags };
1223 ArgData.push_back(ADP);
1226 // 1b. CopyFromReg vararg registers.
1228 // Argument registers
1229 static const uint16_t ArgRegs[] = {
1230 XCore::R0, XCore::R1, XCore::R2, XCore::R3
1232 XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>();
1233 unsigned FirstVAReg = CCInfo.getFirstUnallocated(ArgRegs,
1234 array_lengthof(ArgRegs));
1235 if (FirstVAReg < array_lengthof(ArgRegs)) {
1237 // Save remaining registers, storing higher register numbers at a higher
1239 for (int i = array_lengthof(ArgRegs) - 1; i >= (int)FirstVAReg; --i) {
1240 // Create a stack slot
1241 int FI = MFI->CreateFixedObject(4, offset, true);
1242 if (i == (int)FirstVAReg) {
1243 XFI->setVarArgsFrameIndex(FI);
1245 offset -= StackSlotSize;
1246 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
1247 // Move argument from phys reg -> virt reg
1248 unsigned VReg = RegInfo.createVirtualRegister(&XCore::GRRegsRegClass);
1249 RegInfo.addLiveIn(ArgRegs[i], VReg);
1250 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
1251 CFRegNode.push_back(Val.getValue(Val->getNumValues() - 1));
1252 // Move argument from virt reg -> stack
1253 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
1254 MachinePointerInfo(), false, false, 0);
1255 MemOps.push_back(Store);
1258 // This will point to the next argument passed via stack.
1259 XFI->setVarArgsFrameIndex(
1260 MFI->CreateFixedObject(4, LRSaveSize + CCInfo.getNextStackOffset(),
1265 // 2. chain CopyFromReg nodes into a TokenFactor.
1266 if (!CFRegNode.empty())
1267 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &CFRegNode[0],
1270 // 3. Memcpy 'byVal' args & push final InVals.
1271 // Aggregates passed "byVal" need to be copied by the callee.
1272 // The callee will use a pointer to this copy, rather than the original
1274 for (SmallVectorImpl<ArgDataPair>::const_iterator ArgDI = ArgData.begin(),
1275 ArgDE = ArgData.end();
1276 ArgDI != ArgDE; ++ArgDI) {
1277 if (ArgDI->Flags.isByVal() && ArgDI->Flags.getByValSize()) {
1278 unsigned Size = ArgDI->Flags.getByValSize();
1279 unsigned Align = std::max(StackSlotSize, ArgDI->Flags.getByValAlign());
1280 // Create a new object on the stack and copy the pointee into it.
1281 int FI = MFI->CreateStackObject(Size, Align, false);
1282 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
1283 InVals.push_back(FIN);
1284 MemOps.push_back(DAG.getMemcpy(Chain, dl, FIN, ArgDI->SDV,
1285 DAG.getConstant(Size, MVT::i32),
1286 Align, false, false,
1287 MachinePointerInfo(),
1288 MachinePointerInfo()));
1290 InVals.push_back(ArgDI->SDV);
1294 // 4, chain mem ops nodes into a TokenFactor.
1295 if (!MemOps.empty()) {
1296 MemOps.push_back(Chain);
1297 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, &MemOps[0],
1304 //===----------------------------------------------------------------------===//
1305 // Return Value Calling Convention Implementation
1306 //===----------------------------------------------------------------------===//
1308 bool XCoreTargetLowering::
1309 CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
1311 const SmallVectorImpl<ISD::OutputArg> &Outs,
1312 LLVMContext &Context) const {
1313 SmallVector<CCValAssign, 16> RVLocs;
1314 CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(), RVLocs, Context);
1315 return CCInfo.CheckReturn(Outs, RetCC_XCore);
1319 XCoreTargetLowering::LowerReturn(SDValue Chain,
1320 CallingConv::ID CallConv, bool isVarArg,
1321 const SmallVectorImpl<ISD::OutputArg> &Outs,
1322 const SmallVectorImpl<SDValue> &OutVals,
1323 SDLoc dl, SelectionDAG &DAG) const {
1325 // CCValAssign - represent the assignment of
1326 // the return value to a location
1327 SmallVector<CCValAssign, 16> RVLocs;
1329 // CCState - Info about the registers and stack slot.
1330 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1331 getTargetMachine(), RVLocs, *DAG.getContext());
1333 // Analyze return values.
1334 CCInfo.AnalyzeReturn(Outs, RetCC_XCore);
1337 SmallVector<SDValue, 4> RetOps(1, Chain);
1339 // Return on XCore is always a "retsp 0"
1340 RetOps.push_back(DAG.getConstant(0, MVT::i32));
1342 // Copy the result values into the output registers.
1343 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1344 CCValAssign &VA = RVLocs[i];
1345 assert(VA.isRegLoc() && "Can only return in registers!");
1347 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1350 // guarantee that all emitted copies are
1351 // stuck together, avoiding something bad
1352 Flag = Chain.getValue(1);
1353 RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
1356 RetOps[0] = Chain; // Update chain.
1358 // Add the flag if we have it.
1360 RetOps.push_back(Flag);
1362 return DAG.getNode(XCoreISD::RETSP, dl, MVT::Other,
1363 &RetOps[0], RetOps.size());
1366 //===----------------------------------------------------------------------===//
1367 // Other Lowering Code
1368 //===----------------------------------------------------------------------===//
1371 XCoreTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1372 MachineBasicBlock *BB) const {
1373 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
1374 DebugLoc dl = MI->getDebugLoc();
1375 assert((MI->getOpcode() == XCore::SELECT_CC) &&
1376 "Unexpected instr type to insert");
1378 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
1379 // control-flow pattern. The incoming instruction knows the destination vreg
1380 // to set, the condition code register to branch on, the true/false values to
1381 // select between, and a branch opcode to use.
1382 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1383 MachineFunction::iterator It = BB;
1389 // cmpTY ccX, r1, r2
1391 // fallthrough --> copy0MBB
1392 MachineBasicBlock *thisMBB = BB;
1393 MachineFunction *F = BB->getParent();
1394 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1395 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
1396 F->insert(It, copy0MBB);
1397 F->insert(It, sinkMBB);
1399 // Transfer the remainder of BB and its successor edges to sinkMBB.
1400 sinkMBB->splice(sinkMBB->begin(), BB,
1401 llvm::next(MachineBasicBlock::iterator(MI)),
1403 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
1405 // Next, add the true and fallthrough blocks as its successors.
1406 BB->addSuccessor(copy0MBB);
1407 BB->addSuccessor(sinkMBB);
1409 BuildMI(BB, dl, TII.get(XCore::BRFT_lru6))
1410 .addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
1413 // %FalseValue = ...
1414 // # fallthrough to sinkMBB
1417 // Update machine-CFG edges
1418 BB->addSuccessor(sinkMBB);
1421 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1424 BuildMI(*BB, BB->begin(), dl,
1425 TII.get(XCore::PHI), MI->getOperand(0).getReg())
1426 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
1427 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1429 MI->eraseFromParent(); // The pseudo instruction is gone now.
1433 //===----------------------------------------------------------------------===//
1434 // Target Optimization Hooks
1435 //===----------------------------------------------------------------------===//
1437 SDValue XCoreTargetLowering::PerformDAGCombine(SDNode *N,
1438 DAGCombinerInfo &DCI) const {
1439 SelectionDAG &DAG = DCI.DAG;
1441 switch (N->getOpcode()) {
1443 case XCoreISD::LADD: {
1444 SDValue N0 = N->getOperand(0);
1445 SDValue N1 = N->getOperand(1);
1446 SDValue N2 = N->getOperand(2);
1447 ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
1448 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
1449 EVT VT = N0.getValueType();
1451 // canonicalize constant to RHS
1453 return DAG.getNode(XCoreISD::LADD, dl, DAG.getVTList(VT, VT), N1, N0, N2);
1455 // fold (ladd 0, 0, x) -> 0, x & 1
1456 if (N0C && N0C->isNullValue() && N1C && N1C->isNullValue()) {
1457 SDValue Carry = DAG.getConstant(0, VT);
1458 SDValue Result = DAG.getNode(ISD::AND, dl, VT, N2,
1459 DAG.getConstant(1, VT));
1460 SDValue Ops[] = { Result, Carry };
1461 return DAG.getMergeValues(Ops, 2, dl);
1464 // fold (ladd x, 0, y) -> 0, add x, y iff carry is unused and y has only the
1466 if (N1C && N1C->isNullValue() && N->hasNUsesOfValue(0, 1)) {
1467 APInt KnownZero, KnownOne;
1468 APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(),
1469 VT.getSizeInBits() - 1);
1470 DAG.ComputeMaskedBits(N2, KnownZero, KnownOne);
1471 if ((KnownZero & Mask) == Mask) {
1472 SDValue Carry = DAG.getConstant(0, VT);
1473 SDValue Result = DAG.getNode(ISD::ADD, dl, VT, N0, N2);
1474 SDValue Ops[] = { Result, Carry };
1475 return DAG.getMergeValues(Ops, 2, dl);
1480 case XCoreISD::LSUB: {
1481 SDValue N0 = N->getOperand(0);
1482 SDValue N1 = N->getOperand(1);
1483 SDValue N2 = N->getOperand(2);
1484 ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
1485 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
1486 EVT VT = N0.getValueType();
1488 // fold (lsub 0, 0, x) -> x, -x iff x has only the low bit set
1489 if (N0C && N0C->isNullValue() && N1C && N1C->isNullValue()) {
1490 APInt KnownZero, KnownOne;
1491 APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(),
1492 VT.getSizeInBits() - 1);
1493 DAG.ComputeMaskedBits(N2, KnownZero, KnownOne);
1494 if ((KnownZero & Mask) == Mask) {
1495 SDValue Borrow = N2;
1496 SDValue Result = DAG.getNode(ISD::SUB, dl, VT,
1497 DAG.getConstant(0, VT), N2);
1498 SDValue Ops[] = { Result, Borrow };
1499 return DAG.getMergeValues(Ops, 2, dl);
1503 // fold (lsub x, 0, y) -> 0, sub x, y iff borrow is unused and y has only the
1505 if (N1C && N1C->isNullValue() && N->hasNUsesOfValue(0, 1)) {
1506 APInt KnownZero, KnownOne;
1507 APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(),
1508 VT.getSizeInBits() - 1);
1509 DAG.ComputeMaskedBits(N2, KnownZero, KnownOne);
1510 if ((KnownZero & Mask) == Mask) {
1511 SDValue Borrow = DAG.getConstant(0, VT);
1512 SDValue Result = DAG.getNode(ISD::SUB, dl, VT, N0, N2);
1513 SDValue Ops[] = { Result, Borrow };
1514 return DAG.getMergeValues(Ops, 2, dl);
1519 case XCoreISD::LMUL: {
1520 SDValue N0 = N->getOperand(0);
1521 SDValue N1 = N->getOperand(1);
1522 SDValue N2 = N->getOperand(2);
1523 SDValue N3 = N->getOperand(3);
1524 ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
1525 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
1526 EVT VT = N0.getValueType();
1527 // Canonicalize multiplicative constant to RHS. If both multiplicative
1528 // operands are constant canonicalize smallest to RHS.
1529 if ((N0C && !N1C) ||
1530 (N0C && N1C && N0C->getZExtValue() < N1C->getZExtValue()))
1531 return DAG.getNode(XCoreISD::LMUL, dl, DAG.getVTList(VT, VT),
1535 if (N1C && N1C->isNullValue()) {
1536 // If the high result is unused fold to add(a, b)
1537 if (N->hasNUsesOfValue(0, 0)) {
1538 SDValue Lo = DAG.getNode(ISD::ADD, dl, VT, N2, N3);
1539 SDValue Ops[] = { Lo, Lo };
1540 return DAG.getMergeValues(Ops, 2, dl);
1542 // Otherwise fold to ladd(a, b, 0)
1544 DAG.getNode(XCoreISD::LADD, dl, DAG.getVTList(VT, VT), N2, N3, N1);
1545 SDValue Carry(Result.getNode(), 1);
1546 SDValue Ops[] = { Carry, Result };
1547 return DAG.getMergeValues(Ops, 2, dl);
1552 // Fold 32 bit expressions such as add(add(mul(x,y),a),b) ->
1553 // lmul(x, y, a, b). The high result of lmul will be ignored.
1554 // This is only profitable if the intermediate results are unused
1556 SDValue Mul0, Mul1, Addend0, Addend1;
1557 if (N->getValueType(0) == MVT::i32 &&
1558 isADDADDMUL(SDValue(N, 0), Mul0, Mul1, Addend0, Addend1, true)) {
1559 SDValue Ignored = DAG.getNode(XCoreISD::LMUL, dl,
1560 DAG.getVTList(MVT::i32, MVT::i32), Mul0,
1561 Mul1, Addend0, Addend1);
1562 SDValue Result(Ignored.getNode(), 1);
1565 APInt HighMask = APInt::getHighBitsSet(64, 32);
1566 // Fold 64 bit expression such as add(add(mul(x,y),a),b) ->
1567 // lmul(x, y, a, b) if all operands are zero-extended. We do this
1568 // before type legalization as it is messy to match the operands after
1570 if (N->getValueType(0) == MVT::i64 &&
1571 isADDADDMUL(SDValue(N, 0), Mul0, Mul1, Addend0, Addend1, false) &&
1572 DAG.MaskedValueIsZero(Mul0, HighMask) &&
1573 DAG.MaskedValueIsZero(Mul1, HighMask) &&
1574 DAG.MaskedValueIsZero(Addend0, HighMask) &&
1575 DAG.MaskedValueIsZero(Addend1, HighMask)) {
1576 SDValue Mul0L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1577 Mul0, DAG.getConstant(0, MVT::i32));
1578 SDValue Mul1L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1579 Mul1, DAG.getConstant(0, MVT::i32));
1580 SDValue Addend0L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1581 Addend0, DAG.getConstant(0, MVT::i32));
1582 SDValue Addend1L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1583 Addend1, DAG.getConstant(0, MVT::i32));
1584 SDValue Hi = DAG.getNode(XCoreISD::LMUL, dl,
1585 DAG.getVTList(MVT::i32, MVT::i32), Mul0L, Mul1L,
1586 Addend0L, Addend1L);
1587 SDValue Lo(Hi.getNode(), 1);
1588 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
1593 // Replace unaligned store of unaligned load with memmove.
1594 StoreSDNode *ST = cast<StoreSDNode>(N);
1595 if (!DCI.isBeforeLegalize() ||
1596 allowsUnalignedMemoryAccesses(ST->getMemoryVT()) ||
1597 ST->isVolatile() || ST->isIndexed()) {
1600 SDValue Chain = ST->getChain();
1602 unsigned StoreBits = ST->getMemoryVT().getStoreSizeInBits();
1603 if (StoreBits % 8) {
1606 unsigned ABIAlignment = getDataLayout()->getABITypeAlignment(
1607 ST->getMemoryVT().getTypeForEVT(*DCI.DAG.getContext()));
1608 unsigned Alignment = ST->getAlignment();
1609 if (Alignment >= ABIAlignment) {
1613 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(ST->getValue())) {
1614 if (LD->hasNUsesOfValue(1, 0) && ST->getMemoryVT() == LD->getMemoryVT() &&
1615 LD->getAlignment() == Alignment &&
1616 !LD->isVolatile() && !LD->isIndexed() &&
1617 Chain.reachesChainWithoutSideEffects(SDValue(LD, 1))) {
1618 return DAG.getMemmove(Chain, dl, ST->getBasePtr(),
1620 DAG.getConstant(StoreBits/8, MVT::i32),
1621 Alignment, false, ST->getPointerInfo(),
1622 LD->getPointerInfo());
1631 void XCoreTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
1634 const SelectionDAG &DAG,
1635 unsigned Depth) const {
1636 KnownZero = KnownOne = APInt(KnownZero.getBitWidth(), 0);
1637 switch (Op.getOpcode()) {
1639 case XCoreISD::LADD:
1640 case XCoreISD::LSUB:
1641 if (Op.getResNo() == 1) {
1642 // Top bits of carry / borrow are clear.
1643 KnownZero = APInt::getHighBitsSet(KnownZero.getBitWidth(),
1644 KnownZero.getBitWidth() - 1);
1650 //===----------------------------------------------------------------------===//
1651 // Addressing mode description hooks
1652 //===----------------------------------------------------------------------===//
1654 static inline bool isImmUs(int64_t val)
1656 return (val >= 0 && val <= 11);
1659 static inline bool isImmUs2(int64_t val)
1661 return (val%2 == 0 && isImmUs(val/2));
1664 static inline bool isImmUs4(int64_t val)
1666 return (val%4 == 0 && isImmUs(val/4));
1669 /// isLegalAddressingMode - Return true if the addressing mode represented
1670 /// by AM is legal for this target, for a load/store of the specified type.
1672 XCoreTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1674 if (Ty->getTypeID() == Type::VoidTyID)
1675 return AM.Scale == 0 && isImmUs(AM.BaseOffs) && isImmUs4(AM.BaseOffs);
1677 const DataLayout *TD = TM.getDataLayout();
1678 unsigned Size = TD->getTypeAllocSize(Ty);
1680 return Size >= 4 && !AM.HasBaseReg && AM.Scale == 0 &&
1687 if (AM.Scale == 0) {
1688 return isImmUs(AM.BaseOffs);
1691 return AM.Scale == 1 && AM.BaseOffs == 0;
1695 if (AM.Scale == 0) {
1696 return isImmUs2(AM.BaseOffs);
1699 return AM.Scale == 2 && AM.BaseOffs == 0;
1702 if (AM.Scale == 0) {
1703 return isImmUs4(AM.BaseOffs);
1706 return AM.Scale == 4 && AM.BaseOffs == 0;
1710 //===----------------------------------------------------------------------===//
1711 // XCore Inline Assembly Support
1712 //===----------------------------------------------------------------------===//
1714 std::pair<unsigned, const TargetRegisterClass*>
1715 XCoreTargetLowering::
1716 getRegForInlineAsmConstraint(const std::string &Constraint,
1718 if (Constraint.size() == 1) {
1719 switch (Constraint[0]) {
1722 return std::make_pair(0U, &XCore::GRRegsRegClass);
1725 // Use the default implementation in TargetLowering to convert the register
1726 // constraint into a member of a register class.
1727 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);