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/CallingConv.h"
23 #include "llvm/CodeGen/CallingConvLower.h"
24 #include "llvm/CodeGen/MachineFrameInfo.h"
25 #include "llvm/CodeGen/MachineFunction.h"
26 #include "llvm/CodeGen/MachineInstrBuilder.h"
27 #include "llvm/CodeGen/MachineJumpTableInfo.h"
28 #include "llvm/CodeGen/MachineRegisterInfo.h"
29 #include "llvm/CodeGen/SelectionDAGISel.h"
30 #include "llvm/CodeGen/ValueTypes.h"
31 #include "llvm/DerivedTypes.h"
32 #include "llvm/Function.h"
33 #include "llvm/GlobalAlias.h"
34 #include "llvm/GlobalVariable.h"
35 #include "llvm/Intrinsics.h"
36 #include "llvm/Support/Debug.h"
37 #include "llvm/Support/ErrorHandling.h"
38 #include "llvm/Support/raw_ostream.h"
41 const char *XCoreTargetLowering::
42 getTargetNodeName(unsigned Opcode) const
46 case XCoreISD::BL : return "XCoreISD::BL";
47 case XCoreISD::PCRelativeWrapper : return "XCoreISD::PCRelativeWrapper";
48 case XCoreISD::DPRelativeWrapper : return "XCoreISD::DPRelativeWrapper";
49 case XCoreISD::CPRelativeWrapper : return "XCoreISD::CPRelativeWrapper";
50 case XCoreISD::STWSP : return "XCoreISD::STWSP";
51 case XCoreISD::RETSP : return "XCoreISD::RETSP";
52 case XCoreISD::LADD : return "XCoreISD::LADD";
53 case XCoreISD::LSUB : return "XCoreISD::LSUB";
54 case XCoreISD::LMUL : return "XCoreISD::LMUL";
55 case XCoreISD::MACCU : return "XCoreISD::MACCU";
56 case XCoreISD::MACCS : return "XCoreISD::MACCS";
57 case XCoreISD::BR_JT : return "XCoreISD::BR_JT";
58 case XCoreISD::BR_JT32 : return "XCoreISD::BR_JT32";
59 default : return NULL;
63 XCoreTargetLowering::XCoreTargetLowering(XCoreTargetMachine &XTM)
64 : TargetLowering(XTM, new XCoreTargetObjectFile()),
66 Subtarget(*XTM.getSubtargetImpl()) {
68 // Set up the register classes.
69 addRegisterClass(MVT::i32, &XCore::GRRegsRegClass);
71 // Compute derived properties from the register classes
72 computeRegisterProperties();
74 // Division is expensive
75 setIntDivIsCheap(false);
77 setStackPointerRegisterToSaveRestore(XCore::SP);
79 setSchedulingPreference(Sched::RegPressure);
81 // Use i32 for setcc operations results (slt, sgt, ...).
82 setBooleanContents(ZeroOrOneBooleanContent);
83 setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
85 // XCore does not have the NodeTypes below.
86 setOperationAction(ISD::BR_CC, MVT::Other, Expand);
87 setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
88 setOperationAction(ISD::ADDC, MVT::i32, Expand);
89 setOperationAction(ISD::ADDE, MVT::i32, Expand);
90 setOperationAction(ISD::SUBC, MVT::i32, Expand);
91 setOperationAction(ISD::SUBE, MVT::i32, Expand);
93 // Stop the combiner recombining select and set_cc
94 setOperationAction(ISD::SELECT_CC, MVT::Other, Expand);
97 setOperationAction(ISD::ADD, MVT::i64, Custom);
98 setOperationAction(ISD::SUB, MVT::i64, Custom);
99 setOperationAction(ISD::SMUL_LOHI, MVT::i32, Custom);
100 setOperationAction(ISD::UMUL_LOHI, MVT::i32, Custom);
101 setOperationAction(ISD::MULHS, MVT::i32, Expand);
102 setOperationAction(ISD::MULHU, MVT::i32, Expand);
103 setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
104 setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
105 setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
108 setOperationAction(ISD::CTPOP, MVT::i32, Expand);
109 setOperationAction(ISD::ROTL , MVT::i32, Expand);
110 setOperationAction(ISD::ROTR , MVT::i32, Expand);
111 setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
112 setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
114 setOperationAction(ISD::TRAP, MVT::Other, Legal);
117 setOperationAction(ISD::BR_JT, MVT::Other, Custom);
119 setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
120 setOperationAction(ISD::BlockAddress, MVT::i32 , Custom);
122 // Thread Local Storage
123 setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
125 // Conversion of i64 -> double produces constantpool nodes
126 setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
129 setLoadExtAction(ISD::EXTLOAD, MVT::i1, Promote);
130 setLoadExtAction(ISD::ZEXTLOAD, MVT::i1, Promote);
131 setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Promote);
133 setLoadExtAction(ISD::SEXTLOAD, MVT::i8, Expand);
134 setLoadExtAction(ISD::ZEXTLOAD, MVT::i16, Expand);
136 // Custom expand misaligned loads / stores.
137 setOperationAction(ISD::LOAD, MVT::i32, Custom);
138 setOperationAction(ISD::STORE, MVT::i32, Custom);
141 setOperationAction(ISD::VAEND, MVT::Other, Expand);
142 setOperationAction(ISD::VACOPY, MVT::Other, Expand);
143 setOperationAction(ISD::VAARG, MVT::Other, Custom);
144 setOperationAction(ISD::VASTART, MVT::Other, Custom);
147 setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
148 setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
149 setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
151 // TRAMPOLINE is custom lowered.
152 setOperationAction(ISD::INIT_TRAMPOLINE, MVT::Other, Custom);
153 setOperationAction(ISD::ADJUST_TRAMPOLINE, MVT::Other, Custom);
155 maxStoresPerMemset = maxStoresPerMemsetOptSize = 4;
156 maxStoresPerMemmove = maxStoresPerMemmoveOptSize
157 = maxStoresPerMemcpy = maxStoresPerMemcpyOptSize = 2;
159 // We have target-specific dag combine patterns for the following nodes:
160 setTargetDAGCombine(ISD::STORE);
161 setTargetDAGCombine(ISD::ADD);
163 setMinFunctionAlignment(1);
166 SDValue XCoreTargetLowering::
167 LowerOperation(SDValue Op, SelectionDAG &DAG) const {
168 switch (Op.getOpcode())
170 case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
171 case ISD::GlobalTLSAddress: return LowerGlobalTLSAddress(Op, DAG);
172 case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
173 case ISD::ConstantPool: return LowerConstantPool(Op, DAG);
174 case ISD::BR_JT: return LowerBR_JT(Op, DAG);
175 case ISD::LOAD: return LowerLOAD(Op, DAG);
176 case ISD::STORE: return LowerSTORE(Op, DAG);
177 case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
178 case ISD::VAARG: return LowerVAARG(Op, DAG);
179 case ISD::VASTART: return LowerVASTART(Op, DAG);
180 case ISD::SMUL_LOHI: return LowerSMUL_LOHI(Op, DAG);
181 case ISD::UMUL_LOHI: return LowerUMUL_LOHI(Op, DAG);
182 // FIXME: Remove these when LegalizeDAGTypes lands.
184 case ISD::SUB: return ExpandADDSUB(Op.getNode(), DAG);
185 case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
186 case ISD::INIT_TRAMPOLINE: return LowerINIT_TRAMPOLINE(Op, DAG);
187 case ISD::ADJUST_TRAMPOLINE: return LowerADJUST_TRAMPOLINE(Op, DAG);
189 llvm_unreachable("unimplemented operand");
193 /// ReplaceNodeResults - Replace the results of node with an illegal result
194 /// type with new values built out of custom code.
195 void XCoreTargetLowering::ReplaceNodeResults(SDNode *N,
196 SmallVectorImpl<SDValue>&Results,
197 SelectionDAG &DAG) const {
198 switch (N->getOpcode()) {
200 llvm_unreachable("Don't know how to custom expand this!");
203 Results.push_back(ExpandADDSUB(N, DAG));
208 //===----------------------------------------------------------------------===//
209 // Misc Lower Operation implementation
210 //===----------------------------------------------------------------------===//
212 SDValue XCoreTargetLowering::
213 LowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const
215 DebugLoc dl = Op.getDebugLoc();
216 SDValue Cond = DAG.getNode(ISD::SETCC, dl, MVT::i32, Op.getOperand(2),
217 Op.getOperand(3), Op.getOperand(4));
218 return DAG.getNode(ISD::SELECT, dl, MVT::i32, Cond, Op.getOperand(0),
222 SDValue XCoreTargetLowering::
223 getGlobalAddressWrapper(SDValue GA, const GlobalValue *GV,
224 SelectionDAG &DAG) const
226 // FIXME there is no actual debug info here
227 DebugLoc dl = GA.getDebugLoc();
228 const GlobalValue *UnderlyingGV = GV;
229 // If GV is an alias then use the aliasee to determine the wrapper type
230 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
231 UnderlyingGV = GA->resolveAliasedGlobal();
232 if (const GlobalVariable *GVar = dyn_cast<GlobalVariable>(UnderlyingGV)) {
233 if (GVar->isConstant())
234 return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, GA);
235 return DAG.getNode(XCoreISD::DPRelativeWrapper, dl, MVT::i32, GA);
237 return DAG.getNode(XCoreISD::PCRelativeWrapper, dl, MVT::i32, GA);
240 SDValue XCoreTargetLowering::
241 LowerGlobalAddress(SDValue Op, SelectionDAG &DAG) const
243 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
244 SDValue GA = DAG.getTargetGlobalAddress(GV, Op.getDebugLoc(), MVT::i32);
245 return getGlobalAddressWrapper(GA, GV, DAG);
248 static inline SDValue BuildGetId(SelectionDAG &DAG, DebugLoc dl) {
249 return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, dl, MVT::i32,
250 DAG.getConstant(Intrinsic::xcore_getid, MVT::i32));
253 static inline bool isZeroLengthArray(Type *Ty) {
254 ArrayType *AT = dyn_cast_or_null<ArrayType>(Ty);
255 return AT && (AT->getNumElements() == 0);
258 SDValue XCoreTargetLowering::
259 LowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const
261 // FIXME there isn't really debug info here
262 DebugLoc dl = Op.getDebugLoc();
263 // transform to label + getid() * size
264 const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
265 SDValue GA = DAG.getTargetGlobalAddress(GV, dl, MVT::i32);
266 const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
268 // If GV is an alias then use the aliasee to determine size
269 if (const GlobalAlias *GA = dyn_cast<GlobalAlias>(GV))
270 GVar = dyn_cast_or_null<GlobalVariable>(GA->resolveAliasedGlobal());
273 llvm_unreachable("Thread local object not a GlobalVariable?");
275 Type *Ty = cast<PointerType>(GV->getType())->getElementType();
276 if (!Ty->isSized() || isZeroLengthArray(Ty)) {
278 errs() << "Size of thread local object " << GVar->getName()
283 SDValue base = getGlobalAddressWrapper(GA, GV, DAG);
284 const DataLayout *TD = TM.getDataLayout();
285 unsigned Size = TD->getTypeAllocSize(Ty);
286 SDValue offset = DAG.getNode(ISD::MUL, dl, MVT::i32, BuildGetId(DAG, dl),
287 DAG.getConstant(Size, MVT::i32));
288 return DAG.getNode(ISD::ADD, dl, MVT::i32, base, offset);
291 SDValue XCoreTargetLowering::
292 LowerBlockAddress(SDValue Op, SelectionDAG &DAG) const
294 DebugLoc DL = Op.getDebugLoc();
296 const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
297 SDValue Result = DAG.getTargetBlockAddress(BA, getPointerTy());
299 return DAG.getNode(XCoreISD::PCRelativeWrapper, DL, getPointerTy(), Result);
302 SDValue XCoreTargetLowering::
303 LowerConstantPool(SDValue Op, SelectionDAG &DAG) const
305 ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
306 // FIXME there isn't really debug info here
307 DebugLoc dl = CP->getDebugLoc();
308 EVT PtrVT = Op.getValueType();
310 if (CP->isMachineConstantPoolEntry()) {
311 Res = DAG.getTargetConstantPool(CP->getMachineCPVal(), PtrVT,
314 Res = DAG.getTargetConstantPool(CP->getConstVal(), PtrVT,
317 return DAG.getNode(XCoreISD::CPRelativeWrapper, dl, MVT::i32, Res);
320 unsigned XCoreTargetLowering::getJumpTableEncoding() const {
321 return MachineJumpTableInfo::EK_Inline;
324 SDValue XCoreTargetLowering::
325 LowerBR_JT(SDValue Op, SelectionDAG &DAG) const
327 SDValue Chain = Op.getOperand(0);
328 SDValue Table = Op.getOperand(1);
329 SDValue Index = Op.getOperand(2);
330 DebugLoc dl = Op.getDebugLoc();
331 JumpTableSDNode *JT = cast<JumpTableSDNode>(Table);
332 unsigned JTI = JT->getIndex();
333 MachineFunction &MF = DAG.getMachineFunction();
334 const MachineJumpTableInfo *MJTI = MF.getJumpTableInfo();
335 SDValue TargetJT = DAG.getTargetJumpTable(JT->getIndex(), MVT::i32);
337 unsigned NumEntries = MJTI->getJumpTables()[JTI].MBBs.size();
338 if (NumEntries <= 32) {
339 return DAG.getNode(XCoreISD::BR_JT, dl, MVT::Other, Chain, TargetJT, Index);
341 assert((NumEntries >> 31) == 0);
342 SDValue ScaledIndex = DAG.getNode(ISD::SHL, dl, MVT::i32, Index,
343 DAG.getConstant(1, MVT::i32));
344 return DAG.getNode(XCoreISD::BR_JT32, dl, MVT::Other, Chain, TargetJT,
349 IsWordAlignedBasePlusConstantOffset(SDValue Addr, SDValue &AlignedBase,
352 if (Addr.getOpcode() != ISD::ADD) {
355 ConstantSDNode *CN = 0;
356 if (!(CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))) {
359 int64_t off = CN->getSExtValue();
360 const SDValue &Base = Addr.getOperand(0);
361 const SDValue *Root = &Base;
362 if (Base.getOpcode() == ISD::ADD &&
363 Base.getOperand(1).getOpcode() == ISD::SHL) {
364 ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Base.getOperand(1)
366 if (CN && (CN->getSExtValue() >= 2)) {
367 Root = &Base.getOperand(0);
370 if (isa<FrameIndexSDNode>(*Root)) {
371 // All frame indicies are word aligned
376 if (Root->getOpcode() == XCoreISD::DPRelativeWrapper ||
377 Root->getOpcode() == XCoreISD::CPRelativeWrapper) {
378 // All dp / cp relative addresses are word aligned
383 // Check for an aligned global variable.
384 if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(*Root)) {
385 const GlobalValue *GV = GA->getGlobal();
386 if (GA->getOffset() == 0 && GV->getAlignment() >= 4) {
395 SDValue XCoreTargetLowering::
396 LowerLOAD(SDValue Op, SelectionDAG &DAG) const {
397 LoadSDNode *LD = cast<LoadSDNode>(Op);
398 assert(LD->getExtensionType() == ISD::NON_EXTLOAD &&
399 "Unexpected extension type");
400 assert(LD->getMemoryVT() == MVT::i32 && "Unexpected load EVT");
401 if (allowsUnalignedMemoryAccesses(LD->getMemoryVT()))
404 unsigned ABIAlignment = getDataLayout()->
405 getABITypeAlignment(LD->getMemoryVT().getTypeForEVT(*DAG.getContext()));
406 // Leave aligned load alone.
407 if (LD->getAlignment() >= ABIAlignment)
410 SDValue Chain = LD->getChain();
411 SDValue BasePtr = LD->getBasePtr();
412 DebugLoc DL = Op.getDebugLoc();
416 if (!LD->isVolatile() &&
417 IsWordAlignedBasePlusConstantOffset(BasePtr, Base, Offset)) {
418 if (Offset % 4 == 0) {
419 // We've managed to infer better alignment information than the load
420 // already has. Use an aligned load.
422 return DAG.getLoad(getPointerTy(), DL, Chain, BasePtr,
423 MachinePointerInfo(),
424 false, false, false, 0);
427 // ldw low, base[offset >> 2]
428 // ldw high, base[(offset >> 2) + 1]
429 // shr low_shifted, low, (offset & 0x3) * 8
430 // shl high_shifted, high, 32 - (offset & 0x3) * 8
431 // or result, low_shifted, high_shifted
432 SDValue LowOffset = DAG.getConstant(Offset & ~0x3, MVT::i32);
433 SDValue HighOffset = DAG.getConstant((Offset & ~0x3) + 4, MVT::i32);
434 SDValue LowShift = DAG.getConstant((Offset & 0x3) * 8, MVT::i32);
435 SDValue HighShift = DAG.getConstant(32 - (Offset & 0x3) * 8, MVT::i32);
437 SDValue LowAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, Base, LowOffset);
438 SDValue HighAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, Base, HighOffset);
440 SDValue Low = DAG.getLoad(getPointerTy(), DL, Chain,
441 LowAddr, MachinePointerInfo(),
442 false, false, false, 0);
443 SDValue High = DAG.getLoad(getPointerTy(), DL, Chain,
444 HighAddr, MachinePointerInfo(),
445 false, false, false, 0);
446 SDValue LowShifted = DAG.getNode(ISD::SRL, DL, MVT::i32, Low, LowShift);
447 SDValue HighShifted = DAG.getNode(ISD::SHL, DL, MVT::i32, High, HighShift);
448 SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i32, LowShifted, HighShifted);
449 Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Low.getValue(1),
451 SDValue Ops[] = { Result, Chain };
452 return DAG.getMergeValues(Ops, 2, DL);
455 if (LD->getAlignment() == 2) {
456 SDValue Low = DAG.getExtLoad(ISD::ZEXTLOAD, DL, MVT::i32, Chain,
457 BasePtr, LD->getPointerInfo(), MVT::i16,
458 LD->isVolatile(), LD->isNonTemporal(), 2);
459 SDValue HighAddr = DAG.getNode(ISD::ADD, DL, MVT::i32, BasePtr,
460 DAG.getConstant(2, MVT::i32));
461 SDValue High = DAG.getExtLoad(ISD::EXTLOAD, DL, MVT::i32, Chain,
463 LD->getPointerInfo().getWithOffset(2),
464 MVT::i16, LD->isVolatile(),
465 LD->isNonTemporal(), 2);
466 SDValue HighShifted = DAG.getNode(ISD::SHL, DL, MVT::i32, High,
467 DAG.getConstant(16, MVT::i32));
468 SDValue Result = DAG.getNode(ISD::OR, DL, MVT::i32, Low, HighShifted);
469 Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Low.getValue(1),
471 SDValue Ops[] = { Result, Chain };
472 return DAG.getMergeValues(Ops, 2, DL);
475 // Lower to a call to __misaligned_load(BasePtr).
476 Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
477 TargetLowering::ArgListTy Args;
478 TargetLowering::ArgListEntry Entry;
481 Entry.Node = BasePtr;
482 Args.push_back(Entry);
484 TargetLowering::CallLoweringInfo CLI(Chain, IntPtrTy, false, false,
485 false, false, 0, CallingConv::C, /*isTailCall=*/false,
486 /*doesNotRet=*/false, /*isReturnValueUsed=*/true,
487 DAG.getExternalSymbol("__misaligned_load", getPointerTy()),
489 std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
492 { CallResult.first, CallResult.second };
494 return DAG.getMergeValues(Ops, 2, DL);
497 SDValue XCoreTargetLowering::
498 LowerSTORE(SDValue Op, SelectionDAG &DAG) const
500 StoreSDNode *ST = cast<StoreSDNode>(Op);
501 assert(!ST->isTruncatingStore() && "Unexpected store type");
502 assert(ST->getMemoryVT() == MVT::i32 && "Unexpected store EVT");
503 if (allowsUnalignedMemoryAccesses(ST->getMemoryVT())) {
506 unsigned ABIAlignment = getDataLayout()->
507 getABITypeAlignment(ST->getMemoryVT().getTypeForEVT(*DAG.getContext()));
508 // Leave aligned store alone.
509 if (ST->getAlignment() >= ABIAlignment) {
512 SDValue Chain = ST->getChain();
513 SDValue BasePtr = ST->getBasePtr();
514 SDValue Value = ST->getValue();
515 DebugLoc dl = Op.getDebugLoc();
517 if (ST->getAlignment() == 2) {
519 SDValue High = DAG.getNode(ISD::SRL, dl, MVT::i32, Value,
520 DAG.getConstant(16, MVT::i32));
521 SDValue StoreLow = DAG.getTruncStore(Chain, dl, Low, BasePtr,
522 ST->getPointerInfo(), MVT::i16,
523 ST->isVolatile(), ST->isNonTemporal(),
525 SDValue HighAddr = DAG.getNode(ISD::ADD, dl, MVT::i32, BasePtr,
526 DAG.getConstant(2, MVT::i32));
527 SDValue StoreHigh = DAG.getTruncStore(Chain, dl, High, HighAddr,
528 ST->getPointerInfo().getWithOffset(2),
529 MVT::i16, ST->isVolatile(),
530 ST->isNonTemporal(), 2);
531 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, StoreLow, StoreHigh);
534 // Lower to a call to __misaligned_store(BasePtr, Value).
535 Type *IntPtrTy = getDataLayout()->getIntPtrType(*DAG.getContext());
536 TargetLowering::ArgListTy Args;
537 TargetLowering::ArgListEntry Entry;
540 Entry.Node = BasePtr;
541 Args.push_back(Entry);
544 Args.push_back(Entry);
546 TargetLowering::CallLoweringInfo CLI(Chain,
547 Type::getVoidTy(*DAG.getContext()), false, false,
548 false, false, 0, CallingConv::C, /*isTailCall=*/false,
549 /*doesNotRet=*/false, /*isReturnValueUsed=*/true,
550 DAG.getExternalSymbol("__misaligned_store", getPointerTy()),
552 std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
554 return CallResult.second;
557 SDValue XCoreTargetLowering::
558 LowerSMUL_LOHI(SDValue Op, SelectionDAG &DAG) const
560 assert(Op.getValueType() == MVT::i32 && Op.getOpcode() == ISD::SMUL_LOHI &&
561 "Unexpected operand to lower!");
562 DebugLoc dl = Op.getDebugLoc();
563 SDValue LHS = Op.getOperand(0);
564 SDValue RHS = Op.getOperand(1);
565 SDValue Zero = DAG.getConstant(0, MVT::i32);
566 SDValue Hi = DAG.getNode(XCoreISD::MACCS, dl,
567 DAG.getVTList(MVT::i32, MVT::i32), Zero, Zero,
569 SDValue Lo(Hi.getNode(), 1);
570 SDValue Ops[] = { Lo, Hi };
571 return DAG.getMergeValues(Ops, 2, dl);
574 SDValue XCoreTargetLowering::
575 LowerUMUL_LOHI(SDValue Op, SelectionDAG &DAG) const
577 assert(Op.getValueType() == MVT::i32 && Op.getOpcode() == ISD::UMUL_LOHI &&
578 "Unexpected operand to lower!");
579 DebugLoc dl = Op.getDebugLoc();
580 SDValue LHS = Op.getOperand(0);
581 SDValue RHS = Op.getOperand(1);
582 SDValue Zero = DAG.getConstant(0, MVT::i32);
583 SDValue Hi = DAG.getNode(XCoreISD::LMUL, dl,
584 DAG.getVTList(MVT::i32, MVT::i32), LHS, RHS,
586 SDValue Lo(Hi.getNode(), 1);
587 SDValue Ops[] = { Lo, Hi };
588 return DAG.getMergeValues(Ops, 2, dl);
591 /// isADDADDMUL - Return whether Op is in a form that is equivalent to
592 /// add(add(mul(x,y),a),b). If requireIntermediatesHaveOneUse is true then
593 /// each intermediate result in the calculation must also have a single use.
594 /// If the Op is in the correct form the constituent parts are written to Mul0,
595 /// Mul1, Addend0 and Addend1.
597 isADDADDMUL(SDValue Op, SDValue &Mul0, SDValue &Mul1, SDValue &Addend0,
598 SDValue &Addend1, bool requireIntermediatesHaveOneUse)
600 if (Op.getOpcode() != ISD::ADD)
602 SDValue N0 = Op.getOperand(0);
603 SDValue N1 = Op.getOperand(1);
606 if (N0.getOpcode() == ISD::ADD) {
609 } else if (N1.getOpcode() == ISD::ADD) {
615 if (requireIntermediatesHaveOneUse && !AddOp.hasOneUse())
617 if (OtherOp.getOpcode() == ISD::MUL) {
618 // add(add(a,b),mul(x,y))
619 if (requireIntermediatesHaveOneUse && !OtherOp.hasOneUse())
621 Mul0 = OtherOp.getOperand(0);
622 Mul1 = OtherOp.getOperand(1);
623 Addend0 = AddOp.getOperand(0);
624 Addend1 = AddOp.getOperand(1);
627 if (AddOp.getOperand(0).getOpcode() == ISD::MUL) {
628 // add(add(mul(x,y),a),b)
629 if (requireIntermediatesHaveOneUse && !AddOp.getOperand(0).hasOneUse())
631 Mul0 = AddOp.getOperand(0).getOperand(0);
632 Mul1 = AddOp.getOperand(0).getOperand(1);
633 Addend0 = AddOp.getOperand(1);
637 if (AddOp.getOperand(1).getOpcode() == ISD::MUL) {
638 // add(add(a,mul(x,y)),b)
639 if (requireIntermediatesHaveOneUse && !AddOp.getOperand(1).hasOneUse())
641 Mul0 = AddOp.getOperand(1).getOperand(0);
642 Mul1 = AddOp.getOperand(1).getOperand(1);
643 Addend0 = AddOp.getOperand(0);
650 SDValue XCoreTargetLowering::
651 TryExpandADDWithMul(SDNode *N, SelectionDAG &DAG) const
655 if (N->getOperand(0).getOpcode() == ISD::MUL) {
656 Mul = N->getOperand(0);
657 Other = N->getOperand(1);
658 } else if (N->getOperand(1).getOpcode() == ISD::MUL) {
659 Mul = N->getOperand(1);
660 Other = N->getOperand(0);
664 DebugLoc dl = N->getDebugLoc();
665 SDValue LL, RL, AddendL, AddendH;
666 LL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
667 Mul.getOperand(0), DAG.getConstant(0, MVT::i32));
668 RL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
669 Mul.getOperand(1), DAG.getConstant(0, MVT::i32));
670 AddendL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
671 Other, DAG.getConstant(0, MVT::i32));
672 AddendH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
673 Other, DAG.getConstant(1, MVT::i32));
674 APInt HighMask = APInt::getHighBitsSet(64, 32);
675 unsigned LHSSB = DAG.ComputeNumSignBits(Mul.getOperand(0));
676 unsigned RHSSB = DAG.ComputeNumSignBits(Mul.getOperand(1));
677 if (DAG.MaskedValueIsZero(Mul.getOperand(0), HighMask) &&
678 DAG.MaskedValueIsZero(Mul.getOperand(1), HighMask)) {
679 // The inputs are both zero-extended.
680 SDValue Hi = DAG.getNode(XCoreISD::MACCU, dl,
681 DAG.getVTList(MVT::i32, MVT::i32), AddendH,
683 SDValue Lo(Hi.getNode(), 1);
684 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
686 if (LHSSB > 32 && RHSSB > 32) {
687 // The inputs are both sign-extended.
688 SDValue Hi = DAG.getNode(XCoreISD::MACCS, dl,
689 DAG.getVTList(MVT::i32, MVT::i32), AddendH,
691 SDValue Lo(Hi.getNode(), 1);
692 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
695 LH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
696 Mul.getOperand(0), DAG.getConstant(1, MVT::i32));
697 RH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
698 Mul.getOperand(1), DAG.getConstant(1, MVT::i32));
699 SDValue Hi = DAG.getNode(XCoreISD::MACCU, dl,
700 DAG.getVTList(MVT::i32, MVT::i32), AddendH,
702 SDValue Lo(Hi.getNode(), 1);
703 RH = DAG.getNode(ISD::MUL, dl, MVT::i32, LL, RH);
704 LH = DAG.getNode(ISD::MUL, dl, MVT::i32, LH, RL);
705 Hi = DAG.getNode(ISD::ADD, dl, MVT::i32, Hi, RH);
706 Hi = DAG.getNode(ISD::ADD, dl, MVT::i32, Hi, LH);
707 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
710 SDValue XCoreTargetLowering::
711 ExpandADDSUB(SDNode *N, SelectionDAG &DAG) const
713 assert(N->getValueType(0) == MVT::i64 &&
714 (N->getOpcode() == ISD::ADD || N->getOpcode() == ISD::SUB) &&
715 "Unknown operand to lower!");
717 if (N->getOpcode() == ISD::ADD) {
718 SDValue Result = TryExpandADDWithMul(N, DAG);
719 if (Result.getNode() != 0)
723 DebugLoc dl = N->getDebugLoc();
725 // Extract components
726 SDValue LHSL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
727 N->getOperand(0), DAG.getConstant(0, MVT::i32));
728 SDValue LHSH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
729 N->getOperand(0), DAG.getConstant(1, MVT::i32));
730 SDValue RHSL = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
731 N->getOperand(1), DAG.getConstant(0, MVT::i32));
732 SDValue RHSH = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
733 N->getOperand(1), DAG.getConstant(1, MVT::i32));
736 unsigned Opcode = (N->getOpcode() == ISD::ADD) ? XCoreISD::LADD :
738 SDValue Zero = DAG.getConstant(0, MVT::i32);
739 SDValue Carry = DAG.getNode(Opcode, dl, DAG.getVTList(MVT::i32, MVT::i32),
741 SDValue Lo(Carry.getNode(), 1);
743 SDValue Ignored = DAG.getNode(Opcode, dl, DAG.getVTList(MVT::i32, MVT::i32),
745 SDValue Hi(Ignored.getNode(), 1);
747 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
750 SDValue XCoreTargetLowering::
751 LowerVAARG(SDValue Op, SelectionDAG &DAG) const
753 llvm_unreachable("unimplemented");
754 // FIXME Arguments passed by reference need a extra dereference.
755 SDNode *Node = Op.getNode();
756 DebugLoc dl = Node->getDebugLoc();
757 const Value *V = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
758 EVT VT = Node->getValueType(0);
759 SDValue VAList = DAG.getLoad(getPointerTy(), dl, Node->getOperand(0),
760 Node->getOperand(1), MachinePointerInfo(V),
761 false, false, false, 0);
762 // Increment the pointer, VAList, to the next vararg
763 SDValue Tmp3 = DAG.getNode(ISD::ADD, dl, getPointerTy(), VAList,
764 DAG.getConstant(VT.getSizeInBits(),
766 // Store the incremented VAList to the legalized pointer
767 Tmp3 = DAG.getStore(VAList.getValue(1), dl, Tmp3, Node->getOperand(1),
768 MachinePointerInfo(V), false, false, 0);
769 // Load the actual argument out of the pointer VAList
770 return DAG.getLoad(VT, dl, Tmp3, VAList, MachinePointerInfo(),
771 false, false, false, 0);
774 SDValue XCoreTargetLowering::
775 LowerVASTART(SDValue Op, SelectionDAG &DAG) const
777 DebugLoc dl = Op.getDebugLoc();
778 // vastart stores the address of the VarArgsFrameIndex slot into the
779 // memory location argument
780 MachineFunction &MF = DAG.getMachineFunction();
781 XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>();
782 SDValue Addr = DAG.getFrameIndex(XFI->getVarArgsFrameIndex(), MVT::i32);
783 return DAG.getStore(Op.getOperand(0), dl, Addr, Op.getOperand(1),
784 MachinePointerInfo(), false, false, 0);
787 SDValue XCoreTargetLowering::LowerFRAMEADDR(SDValue Op,
788 SelectionDAG &DAG) const {
789 DebugLoc dl = Op.getDebugLoc();
790 // Depths > 0 not supported yet!
791 if (cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() > 0)
794 MachineFunction &MF = DAG.getMachineFunction();
795 const TargetRegisterInfo *RegInfo = getTargetMachine().getRegisterInfo();
796 return DAG.getCopyFromReg(DAG.getEntryNode(), dl,
797 RegInfo->getFrameRegister(MF), MVT::i32);
800 SDValue XCoreTargetLowering::
801 LowerADJUST_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const {
802 return Op.getOperand(0);
805 SDValue XCoreTargetLowering::
806 LowerINIT_TRAMPOLINE(SDValue Op, SelectionDAG &DAG) const {
807 SDValue Chain = Op.getOperand(0);
808 SDValue Trmp = Op.getOperand(1); // trampoline
809 SDValue FPtr = Op.getOperand(2); // nested function
810 SDValue Nest = Op.getOperand(3); // 'nest' parameter value
812 const Value *TrmpAddr = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
815 // LDAPF_u10 r11, nest
816 // LDW_2rus r11, r11[0]
817 // STWSP_ru6 r11, sp[0]
818 // LDAPF_u10 r11, fptr
819 // LDW_2rus r11, r11[0]
825 SDValue OutChains[5];
829 DebugLoc dl = Op.getDebugLoc();
830 OutChains[0] = DAG.getStore(Chain, dl, DAG.getConstant(0x0a3cd805, MVT::i32),
831 Addr, MachinePointerInfo(TrmpAddr), false, false,
834 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
835 DAG.getConstant(4, MVT::i32));
836 OutChains[1] = DAG.getStore(Chain, dl, DAG.getConstant(0xd80456c0, MVT::i32),
837 Addr, MachinePointerInfo(TrmpAddr, 4), false,
840 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
841 DAG.getConstant(8, MVT::i32));
842 OutChains[2] = DAG.getStore(Chain, dl, DAG.getConstant(0x27fb0a3c, MVT::i32),
843 Addr, MachinePointerInfo(TrmpAddr, 8), false,
846 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
847 DAG.getConstant(12, MVT::i32));
848 OutChains[3] = DAG.getStore(Chain, dl, Nest, Addr,
849 MachinePointerInfo(TrmpAddr, 12), false, false,
852 Addr = DAG.getNode(ISD::ADD, dl, MVT::i32, Trmp,
853 DAG.getConstant(16, MVT::i32));
854 OutChains[4] = DAG.getStore(Chain, dl, FPtr, Addr,
855 MachinePointerInfo(TrmpAddr, 16), false, false,
858 return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, OutChains, 5);
861 //===----------------------------------------------------------------------===//
862 // Calling Convention Implementation
863 //===----------------------------------------------------------------------===//
865 #include "XCoreGenCallingConv.inc"
867 //===----------------------------------------------------------------------===//
868 // Call Calling Convention Implementation
869 //===----------------------------------------------------------------------===//
871 /// XCore call implementation
873 XCoreTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
874 SmallVectorImpl<SDValue> &InVals) const {
875 SelectionDAG &DAG = CLI.DAG;
876 DebugLoc &dl = CLI.DL;
877 SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs;
878 SmallVector<SDValue, 32> &OutVals = CLI.OutVals;
879 SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins;
880 SDValue Chain = CLI.Chain;
881 SDValue Callee = CLI.Callee;
882 bool &isTailCall = CLI.IsTailCall;
883 CallingConv::ID CallConv = CLI.CallConv;
884 bool isVarArg = CLI.IsVarArg;
886 // XCore target does not yet support tail call optimization.
889 // For now, only CallingConv::C implemented
893 llvm_unreachable("Unsupported calling convention");
894 case CallingConv::Fast:
896 return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall,
897 Outs, OutVals, Ins, dl, DAG, InVals);
901 /// LowerCCCCallTo - functions arguments are copied from virtual
902 /// regs to (physical regs)/(stack frame), CALLSEQ_START and
903 /// CALLSEQ_END are emitted.
904 /// TODO: isTailCall, sret.
906 XCoreTargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
907 CallingConv::ID CallConv, bool isVarArg,
909 const SmallVectorImpl<ISD::OutputArg> &Outs,
910 const SmallVectorImpl<SDValue> &OutVals,
911 const SmallVectorImpl<ISD::InputArg> &Ins,
912 DebugLoc dl, SelectionDAG &DAG,
913 SmallVectorImpl<SDValue> &InVals) const {
915 // Analyze operands of the call, assigning locations to each operand.
916 SmallVector<CCValAssign, 16> ArgLocs;
917 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
918 getTargetMachine(), ArgLocs, *DAG.getContext());
920 // The ABI dictates there should be one stack slot available to the callee
921 // on function entry (for saving lr).
922 CCInfo.AllocateStack(4, 4);
924 CCInfo.AnalyzeCallOperands(Outs, CC_XCore);
926 // Get a count of how many bytes are to be pushed on the stack.
927 unsigned NumBytes = CCInfo.getNextStackOffset();
929 Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(NumBytes,
930 getPointerTy(), true));
932 SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
933 SmallVector<SDValue, 12> MemOpChains;
935 // Walk the register/memloc assignments, inserting copies/loads.
936 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
937 CCValAssign &VA = ArgLocs[i];
938 SDValue Arg = OutVals[i];
940 // Promote the value if needed.
941 switch (VA.getLocInfo()) {
942 default: llvm_unreachable("Unknown loc info!");
943 case CCValAssign::Full: break;
944 case CCValAssign::SExt:
945 Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
947 case CCValAssign::ZExt:
948 Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
950 case CCValAssign::AExt:
951 Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
955 // Arguments that can be passed on register must be kept at
958 RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
960 assert(VA.isMemLoc());
962 int Offset = VA.getLocMemOffset();
964 MemOpChains.push_back(DAG.getNode(XCoreISD::STWSP, dl, MVT::Other,
966 DAG.getConstant(Offset/4, MVT::i32)));
970 // Transform all store nodes into one single node because
971 // all store nodes are independent of each other.
972 if (!MemOpChains.empty())
973 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
974 &MemOpChains[0], MemOpChains.size());
976 // Build a sequence of copy-to-reg nodes chained together with token
977 // chain and flag operands which copy the outgoing args into registers.
978 // The InFlag in necessary since all emitted instructions must be
981 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
982 Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
983 RegsToPass[i].second, InFlag);
984 InFlag = Chain.getValue(1);
987 // If the callee is a GlobalAddress node (quite common, every direct call is)
988 // turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
989 // Likewise ExternalSymbol -> TargetExternalSymbol.
990 if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
991 Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i32);
992 else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
993 Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i32);
995 // XCoreBranchLink = #chain, #target_address, #opt_in_flags...
996 // = Chain, Callee, Reg#1, Reg#2, ...
998 // Returns a chain & a flag for retval copy to use.
999 SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
1000 SmallVector<SDValue, 8> Ops;
1001 Ops.push_back(Chain);
1002 Ops.push_back(Callee);
1004 // Add argument registers to the end of the list so that they are
1005 // known live into the call.
1006 for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
1007 Ops.push_back(DAG.getRegister(RegsToPass[i].first,
1008 RegsToPass[i].second.getValueType()));
1010 if (InFlag.getNode())
1011 Ops.push_back(InFlag);
1013 Chain = DAG.getNode(XCoreISD::BL, dl, NodeTys, &Ops[0], Ops.size());
1014 InFlag = Chain.getValue(1);
1016 // Create the CALLSEQ_END node.
1017 Chain = DAG.getCALLSEQ_END(Chain,
1018 DAG.getConstant(NumBytes, getPointerTy(), true),
1019 DAG.getConstant(0, getPointerTy(), true),
1021 InFlag = Chain.getValue(1);
1023 // Handle result values, copying them out of physregs into vregs that we
1025 return LowerCallResult(Chain, InFlag, CallConv, isVarArg,
1026 Ins, dl, DAG, InVals);
1029 /// LowerCallResult - Lower the result values of a call into the
1030 /// appropriate copies out of appropriate physical registers.
1032 XCoreTargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
1033 CallingConv::ID CallConv, bool isVarArg,
1034 const SmallVectorImpl<ISD::InputArg> &Ins,
1035 DebugLoc dl, SelectionDAG &DAG,
1036 SmallVectorImpl<SDValue> &InVals) const {
1038 // Assign locations to each value returned by this call.
1039 SmallVector<CCValAssign, 16> RVLocs;
1040 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1041 getTargetMachine(), RVLocs, *DAG.getContext());
1043 CCInfo.AnalyzeCallResult(Ins, RetCC_XCore);
1045 // Copy all of the result registers out of their specified physreg.
1046 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1047 Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
1048 RVLocs[i].getValVT(), InFlag).getValue(1);
1049 InFlag = Chain.getValue(2);
1050 InVals.push_back(Chain.getValue(0));
1056 //===----------------------------------------------------------------------===//
1057 // Formal Arguments Calling Convention Implementation
1058 //===----------------------------------------------------------------------===//
1060 /// XCore formal arguments implementation
1062 XCoreTargetLowering::LowerFormalArguments(SDValue Chain,
1063 CallingConv::ID CallConv,
1065 const SmallVectorImpl<ISD::InputArg> &Ins,
1068 SmallVectorImpl<SDValue> &InVals)
1073 llvm_unreachable("Unsupported calling convention");
1074 case CallingConv::C:
1075 case CallingConv::Fast:
1076 return LowerCCCArguments(Chain, CallConv, isVarArg,
1077 Ins, dl, DAG, InVals);
1081 /// LowerCCCArguments - transform physical registers into
1082 /// virtual registers and generate load operations for
1083 /// arguments places on the stack.
1086 XCoreTargetLowering::LowerCCCArguments(SDValue Chain,
1087 CallingConv::ID CallConv,
1089 const SmallVectorImpl<ISD::InputArg>
1093 SmallVectorImpl<SDValue> &InVals) const {
1094 MachineFunction &MF = DAG.getMachineFunction();
1095 MachineFrameInfo *MFI = MF.getFrameInfo();
1096 MachineRegisterInfo &RegInfo = MF.getRegInfo();
1098 // Assign locations to all of the incoming arguments.
1099 SmallVector<CCValAssign, 16> ArgLocs;
1100 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1101 getTargetMachine(), ArgLocs, *DAG.getContext());
1103 CCInfo.AnalyzeFormalArguments(Ins, CC_XCore);
1105 unsigned StackSlotSize = XCoreFrameLowering::stackSlotSize();
1107 unsigned LRSaveSize = StackSlotSize;
1109 for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
1111 CCValAssign &VA = ArgLocs[i];
1113 if (VA.isRegLoc()) {
1114 // Arguments passed in registers
1115 EVT RegVT = VA.getLocVT();
1116 switch (RegVT.getSimpleVT().SimpleTy) {
1120 errs() << "LowerFormalArguments Unhandled argument type: "
1121 << RegVT.getSimpleVT().SimpleTy << "\n";
1123 llvm_unreachable(0);
1126 unsigned VReg = RegInfo.createVirtualRegister(&XCore::GRRegsRegClass);
1127 RegInfo.addLiveIn(VA.getLocReg(), VReg);
1128 InVals.push_back(DAG.getCopyFromReg(Chain, dl, VReg, RegVT));
1132 assert(VA.isMemLoc());
1133 // Load the argument to a virtual register
1134 unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
1135 if (ObjSize > StackSlotSize) {
1136 errs() << "LowerFormalArguments Unhandled argument type: "
1137 << EVT(VA.getLocVT()).getEVTString()
1140 // Create the frame index object for this incoming parameter...
1141 int FI = MFI->CreateFixedObject(ObjSize,
1142 LRSaveSize + VA.getLocMemOffset(),
1145 // Create the SelectionDAG nodes corresponding to a load
1146 //from this parameter
1147 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
1148 InVals.push_back(DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
1149 MachinePointerInfo::getFixedStack(FI),
1150 false, false, false, 0));
1155 /* Argument registers */
1156 static const uint16_t ArgRegs[] = {
1157 XCore::R0, XCore::R1, XCore::R2, XCore::R3
1159 XCoreFunctionInfo *XFI = MF.getInfo<XCoreFunctionInfo>();
1160 unsigned FirstVAReg = CCInfo.getFirstUnallocated(ArgRegs,
1161 array_lengthof(ArgRegs));
1162 if (FirstVAReg < array_lengthof(ArgRegs)) {
1163 SmallVector<SDValue, 4> MemOps;
1165 // Save remaining registers, storing higher register numbers at a higher
1167 for (int i = array_lengthof(ArgRegs) - 1; i >= (int)FirstVAReg; --i) {
1168 // Create a stack slot
1169 int FI = MFI->CreateFixedObject(4, offset, true);
1170 if (i == (int)FirstVAReg) {
1171 XFI->setVarArgsFrameIndex(FI);
1173 offset -= StackSlotSize;
1174 SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
1175 // Move argument from phys reg -> virt reg
1176 unsigned VReg = RegInfo.createVirtualRegister(&XCore::GRRegsRegClass);
1177 RegInfo.addLiveIn(ArgRegs[i], VReg);
1178 SDValue Val = DAG.getCopyFromReg(Chain, dl, VReg, MVT::i32);
1179 // Move argument from virt reg -> stack
1180 SDValue Store = DAG.getStore(Val.getValue(1), dl, Val, FIN,
1181 MachinePointerInfo(), false, false, 0);
1182 MemOps.push_back(Store);
1184 if (!MemOps.empty())
1185 Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other,
1186 &MemOps[0], MemOps.size());
1188 // This will point to the next argument passed via stack.
1189 XFI->setVarArgsFrameIndex(
1190 MFI->CreateFixedObject(4, LRSaveSize + CCInfo.getNextStackOffset(),
1198 //===----------------------------------------------------------------------===//
1199 // Return Value Calling Convention Implementation
1200 //===----------------------------------------------------------------------===//
1202 bool XCoreTargetLowering::
1203 CanLowerReturn(CallingConv::ID CallConv, MachineFunction &MF,
1205 const SmallVectorImpl<ISD::OutputArg> &Outs,
1206 LLVMContext &Context) const {
1207 SmallVector<CCValAssign, 16> RVLocs;
1208 CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(), RVLocs, Context);
1209 return CCInfo.CheckReturn(Outs, RetCC_XCore);
1213 XCoreTargetLowering::LowerReturn(SDValue Chain,
1214 CallingConv::ID CallConv, bool isVarArg,
1215 const SmallVectorImpl<ISD::OutputArg> &Outs,
1216 const SmallVectorImpl<SDValue> &OutVals,
1217 DebugLoc dl, SelectionDAG &DAG) const {
1219 // CCValAssign - represent the assignment of
1220 // the return value to a location
1221 SmallVector<CCValAssign, 16> RVLocs;
1223 // CCState - Info about the registers and stack slot.
1224 CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
1225 getTargetMachine(), RVLocs, *DAG.getContext());
1227 // Analyze return values.
1228 CCInfo.AnalyzeReturn(Outs, RetCC_XCore);
1230 // If this is the first return lowered for this function, add
1231 // the regs to the liveout set for the function.
1232 if (DAG.getMachineFunction().getRegInfo().liveout_empty()) {
1233 for (unsigned i = 0; i != RVLocs.size(); ++i)
1234 if (RVLocs[i].isRegLoc())
1235 DAG.getMachineFunction().getRegInfo().addLiveOut(RVLocs[i].getLocReg());
1240 // Copy the result values into the output registers.
1241 for (unsigned i = 0; i != RVLocs.size(); ++i) {
1242 CCValAssign &VA = RVLocs[i];
1243 assert(VA.isRegLoc() && "Can only return in registers!");
1245 Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
1248 // guarantee that all emitted copies are
1249 // stuck together, avoiding something bad
1250 Flag = Chain.getValue(1);
1253 // Return on XCore is always a "retsp 0"
1255 return DAG.getNode(XCoreISD::RETSP, dl, MVT::Other,
1256 Chain, DAG.getConstant(0, MVT::i32), Flag);
1258 return DAG.getNode(XCoreISD::RETSP, dl, MVT::Other,
1259 Chain, DAG.getConstant(0, MVT::i32));
1262 //===----------------------------------------------------------------------===//
1263 // Other Lowering Code
1264 //===----------------------------------------------------------------------===//
1267 XCoreTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1268 MachineBasicBlock *BB) const {
1269 const TargetInstrInfo &TII = *getTargetMachine().getInstrInfo();
1270 DebugLoc dl = MI->getDebugLoc();
1271 assert((MI->getOpcode() == XCore::SELECT_CC) &&
1272 "Unexpected instr type to insert");
1274 // To "insert" a SELECT_CC instruction, we actually have to insert the diamond
1275 // control-flow pattern. The incoming instruction knows the destination vreg
1276 // to set, the condition code register to branch on, the true/false values to
1277 // select between, and a branch opcode to use.
1278 const BasicBlock *LLVM_BB = BB->getBasicBlock();
1279 MachineFunction::iterator It = BB;
1285 // cmpTY ccX, r1, r2
1287 // fallthrough --> copy0MBB
1288 MachineBasicBlock *thisMBB = BB;
1289 MachineFunction *F = BB->getParent();
1290 MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1291 MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
1292 F->insert(It, copy0MBB);
1293 F->insert(It, sinkMBB);
1295 // Transfer the remainder of BB and its successor edges to sinkMBB.
1296 sinkMBB->splice(sinkMBB->begin(), BB,
1297 llvm::next(MachineBasicBlock::iterator(MI)),
1299 sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
1301 // Next, add the true and fallthrough blocks as its successors.
1302 BB->addSuccessor(copy0MBB);
1303 BB->addSuccessor(sinkMBB);
1305 BuildMI(BB, dl, TII.get(XCore::BRFT_lru6))
1306 .addReg(MI->getOperand(1).getReg()).addMBB(sinkMBB);
1309 // %FalseValue = ...
1310 // # fallthrough to sinkMBB
1313 // Update machine-CFG edges
1314 BB->addSuccessor(sinkMBB);
1317 // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1320 BuildMI(*BB, BB->begin(), dl,
1321 TII.get(XCore::PHI), MI->getOperand(0).getReg())
1322 .addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB)
1323 .addReg(MI->getOperand(2).getReg()).addMBB(thisMBB);
1325 MI->eraseFromParent(); // The pseudo instruction is gone now.
1329 //===----------------------------------------------------------------------===//
1330 // Target Optimization Hooks
1331 //===----------------------------------------------------------------------===//
1333 SDValue XCoreTargetLowering::PerformDAGCombine(SDNode *N,
1334 DAGCombinerInfo &DCI) const {
1335 SelectionDAG &DAG = DCI.DAG;
1336 DebugLoc dl = N->getDebugLoc();
1337 switch (N->getOpcode()) {
1339 case XCoreISD::LADD: {
1340 SDValue N0 = N->getOperand(0);
1341 SDValue N1 = N->getOperand(1);
1342 SDValue N2 = N->getOperand(2);
1343 ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
1344 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
1345 EVT VT = N0.getValueType();
1347 // canonicalize constant to RHS
1349 return DAG.getNode(XCoreISD::LADD, dl, DAG.getVTList(VT, VT), N1, N0, N2);
1351 // fold (ladd 0, 0, x) -> 0, x & 1
1352 if (N0C && N0C->isNullValue() && N1C && N1C->isNullValue()) {
1353 SDValue Carry = DAG.getConstant(0, VT);
1354 SDValue Result = DAG.getNode(ISD::AND, dl, VT, N2,
1355 DAG.getConstant(1, VT));
1356 SDValue Ops [] = { Carry, Result };
1357 return DAG.getMergeValues(Ops, 2, dl);
1360 // fold (ladd x, 0, y) -> 0, add x, y iff carry is unused and y has only the
1362 if (N1C && N1C->isNullValue() && N->hasNUsesOfValue(0, 0)) {
1363 APInt KnownZero, KnownOne;
1364 APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(),
1365 VT.getSizeInBits() - 1);
1366 DAG.ComputeMaskedBits(N2, KnownZero, KnownOne);
1367 if ((KnownZero & Mask) == Mask) {
1368 SDValue Carry = DAG.getConstant(0, VT);
1369 SDValue Result = DAG.getNode(ISD::ADD, dl, VT, N0, N2);
1370 SDValue Ops [] = { Carry, Result };
1371 return DAG.getMergeValues(Ops, 2, dl);
1376 case XCoreISD::LSUB: {
1377 SDValue N0 = N->getOperand(0);
1378 SDValue N1 = N->getOperand(1);
1379 SDValue N2 = N->getOperand(2);
1380 ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
1381 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
1382 EVT VT = N0.getValueType();
1384 // fold (lsub 0, 0, x) -> x, -x iff x has only the low bit set
1385 if (N0C && N0C->isNullValue() && N1C && N1C->isNullValue()) {
1386 APInt KnownZero, KnownOne;
1387 APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(),
1388 VT.getSizeInBits() - 1);
1389 DAG.ComputeMaskedBits(N2, KnownZero, KnownOne);
1390 if ((KnownZero & Mask) == Mask) {
1391 SDValue Borrow = N2;
1392 SDValue Result = DAG.getNode(ISD::SUB, dl, VT,
1393 DAG.getConstant(0, VT), N2);
1394 SDValue Ops [] = { Borrow, Result };
1395 return DAG.getMergeValues(Ops, 2, dl);
1399 // fold (lsub x, 0, y) -> 0, sub x, y iff borrow is unused and y has only the
1401 if (N1C && N1C->isNullValue() && N->hasNUsesOfValue(0, 0)) {
1402 APInt KnownZero, KnownOne;
1403 APInt Mask = APInt::getHighBitsSet(VT.getSizeInBits(),
1404 VT.getSizeInBits() - 1);
1405 DAG.ComputeMaskedBits(N2, KnownZero, KnownOne);
1406 if ((KnownZero & Mask) == Mask) {
1407 SDValue Borrow = DAG.getConstant(0, VT);
1408 SDValue Result = DAG.getNode(ISD::SUB, dl, VT, N0, N2);
1409 SDValue Ops [] = { Borrow, Result };
1410 return DAG.getMergeValues(Ops, 2, dl);
1415 case XCoreISD::LMUL: {
1416 SDValue N0 = N->getOperand(0);
1417 SDValue N1 = N->getOperand(1);
1418 SDValue N2 = N->getOperand(2);
1419 SDValue N3 = N->getOperand(3);
1420 ConstantSDNode *N0C = dyn_cast<ConstantSDNode>(N0);
1421 ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N1);
1422 EVT VT = N0.getValueType();
1423 // Canonicalize multiplicative constant to RHS. If both multiplicative
1424 // operands are constant canonicalize smallest to RHS.
1425 if ((N0C && !N1C) ||
1426 (N0C && N1C && N0C->getZExtValue() < N1C->getZExtValue()))
1427 return DAG.getNode(XCoreISD::LMUL, dl, DAG.getVTList(VT, VT),
1431 if (N1C && N1C->isNullValue()) {
1432 // If the high result is unused fold to add(a, b)
1433 if (N->hasNUsesOfValue(0, 0)) {
1434 SDValue Lo = DAG.getNode(ISD::ADD, dl, VT, N2, N3);
1435 SDValue Ops [] = { Lo, Lo };
1436 return DAG.getMergeValues(Ops, 2, dl);
1438 // Otherwise fold to ladd(a, b, 0)
1439 return DAG.getNode(XCoreISD::LADD, dl, DAG.getVTList(VT, VT), N2, N3, N1);
1444 // Fold 32 bit expressions such as add(add(mul(x,y),a),b) ->
1445 // lmul(x, y, a, b). The high result of lmul will be ignored.
1446 // This is only profitable if the intermediate results are unused
1448 SDValue Mul0, Mul1, Addend0, Addend1;
1449 if (N->getValueType(0) == MVT::i32 &&
1450 isADDADDMUL(SDValue(N, 0), Mul0, Mul1, Addend0, Addend1, true)) {
1451 SDValue Ignored = DAG.getNode(XCoreISD::LMUL, dl,
1452 DAG.getVTList(MVT::i32, MVT::i32), Mul0,
1453 Mul1, Addend0, Addend1);
1454 SDValue Result(Ignored.getNode(), 1);
1457 APInt HighMask = APInt::getHighBitsSet(64, 32);
1458 // Fold 64 bit expression such as add(add(mul(x,y),a),b) ->
1459 // lmul(x, y, a, b) if all operands are zero-extended. We do this
1460 // before type legalization as it is messy to match the operands after
1462 if (N->getValueType(0) == MVT::i64 &&
1463 isADDADDMUL(SDValue(N, 0), Mul0, Mul1, Addend0, Addend1, false) &&
1464 DAG.MaskedValueIsZero(Mul0, HighMask) &&
1465 DAG.MaskedValueIsZero(Mul1, HighMask) &&
1466 DAG.MaskedValueIsZero(Addend0, HighMask) &&
1467 DAG.MaskedValueIsZero(Addend1, HighMask)) {
1468 SDValue Mul0L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1469 Mul0, DAG.getConstant(0, MVT::i32));
1470 SDValue Mul1L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1471 Mul1, DAG.getConstant(0, MVT::i32));
1472 SDValue Addend0L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1473 Addend0, DAG.getConstant(0, MVT::i32));
1474 SDValue Addend1L = DAG.getNode(ISD::EXTRACT_ELEMENT, dl, MVT::i32,
1475 Addend1, DAG.getConstant(0, MVT::i32));
1476 SDValue Hi = DAG.getNode(XCoreISD::LMUL, dl,
1477 DAG.getVTList(MVT::i32, MVT::i32), Mul0L, Mul1L,
1478 Addend0L, Addend1L);
1479 SDValue Lo(Hi.getNode(), 1);
1480 return DAG.getNode(ISD::BUILD_PAIR, dl, MVT::i64, Lo, Hi);
1485 // Replace unaligned store of unaligned load with memmove.
1486 StoreSDNode *ST = cast<StoreSDNode>(N);
1487 if (!DCI.isBeforeLegalize() ||
1488 allowsUnalignedMemoryAccesses(ST->getMemoryVT()) ||
1489 ST->isVolatile() || ST->isIndexed()) {
1492 SDValue Chain = ST->getChain();
1494 unsigned StoreBits = ST->getMemoryVT().getStoreSizeInBits();
1495 if (StoreBits % 8) {
1498 unsigned ABIAlignment = getDataLayout()->getABITypeAlignment(
1499 ST->getMemoryVT().getTypeForEVT(*DCI.DAG.getContext()));
1500 unsigned Alignment = ST->getAlignment();
1501 if (Alignment >= ABIAlignment) {
1505 if (LoadSDNode *LD = dyn_cast<LoadSDNode>(ST->getValue())) {
1506 if (LD->hasNUsesOfValue(1, 0) && ST->getMemoryVT() == LD->getMemoryVT() &&
1507 LD->getAlignment() == Alignment &&
1508 !LD->isVolatile() && !LD->isIndexed() &&
1509 Chain.reachesChainWithoutSideEffects(SDValue(LD, 1))) {
1510 return DAG.getMemmove(Chain, dl, ST->getBasePtr(),
1512 DAG.getConstant(StoreBits/8, MVT::i32),
1513 Alignment, false, ST->getPointerInfo(),
1514 LD->getPointerInfo());
1523 void XCoreTargetLowering::computeMaskedBitsForTargetNode(const SDValue Op,
1526 const SelectionDAG &DAG,
1527 unsigned Depth) const {
1528 KnownZero = KnownOne = APInt(KnownZero.getBitWidth(), 0);
1529 switch (Op.getOpcode()) {
1531 case XCoreISD::LADD:
1532 case XCoreISD::LSUB:
1533 if (Op.getResNo() == 0) {
1534 // Top bits of carry / borrow are clear.
1535 KnownZero = APInt::getHighBitsSet(KnownZero.getBitWidth(),
1536 KnownZero.getBitWidth() - 1);
1542 //===----------------------------------------------------------------------===//
1543 // Addressing mode description hooks
1544 //===----------------------------------------------------------------------===//
1546 static inline bool isImmUs(int64_t val)
1548 return (val >= 0 && val <= 11);
1551 static inline bool isImmUs2(int64_t val)
1553 return (val%2 == 0 && isImmUs(val/2));
1556 static inline bool isImmUs4(int64_t val)
1558 return (val%4 == 0 && isImmUs(val/4));
1561 /// isLegalAddressingMode - Return true if the addressing mode represented
1562 /// by AM is legal for this target, for a load/store of the specified type.
1564 XCoreTargetLowering::isLegalAddressingMode(const AddrMode &AM,
1566 if (Ty->getTypeID() == Type::VoidTyID)
1567 return AM.Scale == 0 && isImmUs(AM.BaseOffs) && isImmUs4(AM.BaseOffs);
1569 const DataLayout *TD = TM.getDataLayout();
1570 unsigned Size = TD->getTypeAllocSize(Ty);
1572 return Size >= 4 && !AM.HasBaseReg && AM.Scale == 0 &&
1579 if (AM.Scale == 0) {
1580 return isImmUs(AM.BaseOffs);
1583 return AM.Scale == 1 && AM.BaseOffs == 0;
1587 if (AM.Scale == 0) {
1588 return isImmUs2(AM.BaseOffs);
1591 return AM.Scale == 2 && AM.BaseOffs == 0;
1594 if (AM.Scale == 0) {
1595 return isImmUs4(AM.BaseOffs);
1598 return AM.Scale == 4 && AM.BaseOffs == 0;
1602 //===----------------------------------------------------------------------===//
1603 // XCore Inline Assembly Support
1604 //===----------------------------------------------------------------------===//
1606 std::pair<unsigned, const TargetRegisterClass*>
1607 XCoreTargetLowering::
1608 getRegForInlineAsmConstraint(const std::string &Constraint,
1610 if (Constraint.size() == 1) {
1611 switch (Constraint[0]) {
1614 return std::make_pair(0U, &XCore::GRRegsRegClass);
1617 // Use the default implementation in TargetLowering to convert the register
1618 // constraint into a member of a register class.
1619 return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);